1N3324B Search Results

1N3324B Price and Stock

Filter by Manufacturer


Microchip Technology Inc 1N3324B DIODE ZENER 30V 50W DO5
Distributors	Part	Package	Stock	Lead Time	Min Order Qty	Price	Buy
DigiKey	1N3324B	Bulk			100	1 - 10 - 100 $42.8 1000 $42.8 10000 $42.8	Buy Now
Avnet Americas	1N3324B	Bulk		35 Weeks	100	1 - 10 - 100 $45.6291 1000 $40.98555 10000 $40.98555	Buy Now
Mouser Electronics	1N3324B					1 - 10 - 100 $46.09 1000 $46.09 10000 $46.09	Get Quote
Newark	1N3324B	Bulk			100	1 - 10 - 100 $42.8 1000 $41.15 10000 $41.15	Buy Now
Microchip Technology Inc	1N3324B			35 Weeks		1 $46.09 10 $46.09 100 $46.09 1000 $46.09 10000 $46.09	Buy Now

Onlinecomponents.com	1N3324B					1 - 10 - 100 $40.86 1000 $40.86 10000 $40.86	Buy Now
NAC	1N3324B	Tray			7	1 $47.03 10 $47.03 100 $43.32 1000 $40.15 10000 $40.15	Buy Now
Master Electronics	1N3324B					1 - 10 - 100 $40.86 1000 $40.86 10000 $40.86	Buy Now
Microchip Technology Inc MS1N3324B Diode Zener Single 30V 5% 50W 1-Pin DO-5 - Trays (Alt: MS1N3324B)
Distributors	Part	Package	Stock	Lead Time	Min Order Qty	Price	Buy
Avnet Americas	MS1N3324B	Tray		29 Weeks	50	1 - 10 - 100 - 1000 - 10000 -	Get Quote
Microchip Technology Inc	MS1N3324B			29 Weeks		1 - 10 - 100 - 1000 - 10000 -	Buy Now
Solid State Devices Inc (SSDI) 1N3324B Zener Diode, 50W, 30V, Do-5; Zener Voltage Nom:30V; Power Dissipation:50W; Diode Case Style:Do-5; No. Of Pins:2Pins; Operating Temperature Max:175°C; Diode Mounting:Stud; Product Range:-; Qualification:- Rohs Compliant: Yes \|Solid State 1N3324B
Distributors	Part	Package	Stock	Lead Time	Min Order Qty	Price	Buy
Newark	1N3324B	Bulk	124		1	1 $10.36 10 $10.36 100 $10.36 1000 $10.36 10000 $10.36	Buy Now
Microchip Technology Inc JAN1N3324B Voltage Regulator _ DO-5, Projected EOL: 2049-02-05
Distributors	Part	Package	Stock	Lead Time	Min Order Qty	Price	Buy
Microchip Technology Inc	JAN1N3324B			35 Weeks		1 $536.24 10 $536.24 100 $536.24 1000 $536.24 10000 $536.24	Buy Now
NAC	JAN1N3324B	Tray			50	1 - 10 - 100 - 1000 - 10000 -	Get Quote
Microchip Technology Inc MS1N3324BT1 Voltage Regulator _ TO-254, Projected EOL: 2049-02-06
Distributors	Part	Package	Stock	Lead Time	Min Order Qty	Price	Buy
Microchip Technology Inc	MS1N3324BT1			40 Weeks		1 - 10 - 100 - 1000 - 10000 -	Buy Now

Find more 1N3324B price and stock on Findchips.com

1N3324B Datasheets (24)

Part	Manufacturer	Description	Datasheet Type	PDF
1N3324B	Central Semiconductor	Leaded Zener Diode Power	Original	PDF
1N3324B	Microsemi	Diodes - Zener - Single, Discrete Semiconductor Products, DIODE ZENER 30V 50W DO-5	Original	PDF
1N3324B	Sussex Semiconductor	.5 TO 10 WATT UNIPOLAR ZENER FLIP-DIE	Original	PDF
1N3324B	Central Semiconductor	10 Watt Zener Diode / 50 Watt Zener Diode	Scan	PDF
1N3324B	Microsemi	Silicon 50 Watt Zener Diodes	Scan	PDF
1N3324B	Microsemi	Data Book 1983	Scan	PDF
1N3324B	Motorola	Motorola Semiconductor Datasheet Library	Scan	PDF
1N3324B	Motorola	The European Selection Data Book 1976	Scan	PDF
1N3324B	Motorola	European Master Selection Guide 1986	Scan	PDF
1N3324B	Unknown	Historical semiconductor price guide (US$ - 1998). From our catalog scanning project.	Historical	PDF
1N3324B	Unknown	Semiconductor Devices, Diode, and SCR Datasheet Catalog	Scan	PDF
1N3324B	Unknown	Shortform Semicon, Diode, and SCR Datasheets	Short Form	PDF
1N3324B	Unknown	Catalog Scans - Shortform Datasheet	Scan	PDF
1N3324B	New England Semiconductor	50 WATT SILICON ZENER DIODES	Scan	PDF

1N3324B	Semicon Components	50 Watt Zener Diodes, TO-3 and DO-5 Case	Scan	PDF
1N3324B	Semitronics	Voltage Reference Diodes / Silicon Zener Diodes (Low Quality Datasheet)	Scan	PDF
1N3324B	Silec Semiconductors	Shortform Data Book 1976	Short Form	PDF
1N3324B	STMicroelectronics	Zener Diode, DO-5	Scan	PDF
1N3324B	Thomson-CSF	Shortform Semiconductor Catalogue 1982	Short Form	PDF
1N3324B+JAN	Defense Electronics Supply Center	30V, 50Wt General purpose voltage reference/regulator diode	Scan	PDF

1N3324B Datasheets Context Search

Catalog Datasheet	MFG & Type	Document Tags	PDF
Untitled Abstract: No abstract text available Text: 1N3324B Diodes General-Purpose Reference/Regulator Diode Military/High-RelN V Z Nom.(V) Reference Voltage30 @I(Z) (A) (Test Condition)420m Tolerance (%)5 P(D) Max. (W)50 Z(z) Max. (ê) Dyn. Imped.3.0 Temp Coef pp/10k Maximum Operating Temp (øC)175õ Package StyleStR-1/4	Original	1N3324B Voltage30 pp/10k	PDF
Arduino Mega2560 Abstract: 13001 S 6D TRANSISTOR arduino uno rev 3 agilent optical encoder 9988 MZ 13001 TRANSISTOR arduino mega 2650 skiip 613 gb 123 ct arduino sound sensor module pic arduino nano mc34063l Text: ND3% BASE1 XXXX2108-0010-1-P 10 TSQ: 3001 CMS: CMS-USM TS host OP: NN COMP: 15-07-11 Hour: 13:07 TS:TS date TS time MCUS, MPUS, DSPS & DEVELOPMENT TOOLS Find Datasheets Online 8-BIT MCUS & DEVELOPMENT TOOLS 1 PSoC 3 DEVELOPMENT KITS ARDUINO MCU DEVLOPMENT PLATFORM	Original	CY8C38 CY8C29 incl795 12T9797 12T9804 12T9803 12T9800 12T9802 12T9801 12T9805 Arduino Mega2560 13001 S 6D TRANSISTOR arduino uno rev 3 agilent optical encoder 9988 MZ 13001 TRANSISTOR arduino mega 2650 skiip 613 gb 123 ct arduino sound sensor module pic arduino nano mc34063l	PDF
1N5048 Abstract: CZ5339B 1n5248 1N5349B DO-41 1N2990B 1N5042 1N5021A 1N4465 1N5025A 1N5041 Text: Zener Diodes POWER 250 mW CASE ZENER VOLTAGE 1.8 2.0 2.2 2.4 2.7 3.0 3.3 3.6 3.9 4.3 4.7 5.1 5.6 6.0 6.2 6.8 7.1 7.5 8.2 8.7 9.1 10 11 12 13 14 15 16 17 18 19 20 22 24 400 mW DO-35 GENERAL PURPOSE 1N702A 1N703A 1N704A 1N705A 1N706A LOW NOISE LOW LEVEL 1N4614	Original	DO-35 1N702A 1N703A 1N704A 1N705A 1N706A 1N4614 1N4615 1N4616 1N4617 1N5048 CZ5339B 1n5248 1N5349B DO-41 1N2990B 1N5042 1N5021A 1N4465 1N5025A 1N5041	PDF
1N3326B Abstract: CZ5372B CZ5379B CZ5363B 1N2828B 1N3004B 1N3350B 1N5363B 1N5365B 1N5367B Text: Zener Diodes Continued POWER 5.0 WATT 10 WATT 50 WATT CASE AX-5W DO-201 DO-4* TO-3* DO-5* ZENER VOLTAGE 30 33 36 39 43 45 47 50 51 52 56 60 62 68 75 82 87 91 100 105 110 120 130 140 150 160 170 175 180 190 200 INDUSTRY STANDARD 1N5363B 1N5364B 1N5365B	Original	DO-201 1N5363B 1N5364B 1N5365B 1N5366B 1N5367B CZ5363B CZ5364B CZ5365B CZ5366B 1N3326B CZ5372B CZ5379B CZ5363B 1N2828B 1N3004B 1N3350B 1N5363B 1N5365B 1N5367B	PDF
Untitled Abstract: No abstract text available Text: Naina Semiconductor Ltd. 1N3305 thru 1N3350 50W Zener Diodes Features • • • • Glass passivated junction Good clamping ability Available in Normal and Reverse polarity Metric and UNF thread type Mechanical Characteristics • • • • • Hermetically sealed DO-5 outline	Original	1N3305 1N3350 DO-203AB -65oC 175oC Noid10	PDF
Untitled Abstract: No abstract text available Text: 1N3305B THRU 1N3350B w w w. c e n t r a l s e m i . c o m SILICON ZENER DIODES 6.8 VOLT THRU 200 VOLT 50W, 5% TOLERANCE DESCRIPTION: The CENTRAL SEMICONDUCTOR 1N3305B series types are silicon Zener diodes manufactured in a hermetically sealed metal case, designed for high	Original	1N3305B 1N3350B 1N3305RB) 21-March	PDF
1N3350B Abstract: 50 watt zener diode 1n4549 1N4556B DO-203AB JANTX1N3305B JANTXV1N3318B 1N4549 1N4549B 1N3305 1N3305RB Text: 1N3305 thru 1N3350B and 1N4549B thru 1N4556B 50 WATT ZENER DIODES SCOTTSDALE DIVISION APPEARANCE These high power 50 W Zener diodes represented by the JEDEC registered 1N3305 thru 1N3350B and 1N4549 thru 1N4556B series provide voltage regulation in a selection over a 3.9 V to 200 V broad range of	Original	1N3305 1N3350B 1N4549B 1N4556B 1N3350B 1N4549 1N4556B 1N3305 50 watt zener diode 1n4549 DO-203AB JANTX1N3305B JANTXV1N3318B 1N3305RB	PDF
1N5363B Abstract: 1N2828B 1N3344B 1N2823B 1N2824B 1N2825B 1N2989B 1N2990B 1N2991B 1N3324B Text: zener Diodes Continued POWER 5.0 WATT 10 WATT 50 WATT Â § CASE AX-5W DO-4* TO-3* DO-5* ZENER VOLTAGE INDUSTRY STANDARD GENERAL PURPOSE GENERAL PURPOSE GENERAL PURPOSE 30 1N5363B 1N2989B 1N2823B 1N3324B 33 1N5364B 1N2990B 1N2824B 1N3325B 36 1N5365B 1N2991B	OCR Scan	1N5363B 1N2989B 1N2823B 1N3324B 1N5364B 1N2990B 1N2824B 1N3325B N5365B 1N2991B 1N2828B 1N3344B 1N2825B 1N3324B	PDF
1N3336B Abstract: No abstract text available Text: Zener Diodes Continued POWER 5.0 WATT 10 WATT 50 WATT à !> CASE AX-5W DO-4* TO-3* DO-5* ZENER VOLTAGE INDUSTRY STANDARD GENERAL PURPOSE GENERAL PURPOSE GENERAL PURPOSE 30 1N5363B 1N2989B 1N2823B 1N3324B 33 1N5364B 1N2990B 1N2824B 1N3325B 36 1N5365B 1N2991B	OCR Scan	1N5363B 1N2989B 1N2823B 1N3324B 1N5364B 1N2990B 1N2824B 1N3325B 1N5365B 1N2991B 1N3336B	PDF
Untitled Abstract: No abstract text available Text: Zener Regulator Diodes Micmsemi i JANTX1N2821B JANTX1N3322B JANTXV1N2821B JANTXV1N3322B 1N2822A ZEN 1N2822B 1N3323A 1N3323B JAN1N2822B JAN1N3323B JANTX1N2822B JANTX1N3323B JANTXV1N2822B JANTXV1N3323B 1N2823A 1N2823B 1N3324A 1N3324B JAN1N2823B 1N3324B JANTX1N2823B	OCR Scan	ZEN-152	PDF
1N2828B Abstract: 1N5378B 1N3001B 1N3014B Text: s a n e r DIOtfM Continued POWER 5.0 WATT 10 WATT 50 WATT c# w I / / CASE AX-5W DO-4* TO-3* DO-5* ZENER VOLTAGE INDUSTRY STANDARD GENERAL PURPOSE GENERAL PURPOSE GENERAL PURPOSE 30 1N5363B 1N2989B 1N2823B 1N3324B 33 36 1N5364B 1N2990B 1N2824B 1N3325B	OCR Scan	1N2989B 1N2990B 1N2991B 1N2992B 1N2993B 1N2994B 1N5368B 1N2995B 1N2996B 1N5369B 1N2828B 1N5378B 1N3001B 1N3014B	PDF
TRIAC 97A6 Abstract: S0805BH 13003 TRANSISTOR TO220 equivalent triacs bt 804 600v Triac bt 808 600C Diode SOT-23 marking 15d zener diode 1N PH 48 6Bs smd transistor Z0409MF equivalent BT 808 600C Text: Central Semiconductor Corp. Represented iSIGNTBOHICS B y: TORONTO I Regan Road, Unit 13, Bram pton, O ntario L7A 1B8 Tel: 905-846-1100 Fax:905-846-7116 E -m a il: d e s ig n tr< a id ire c t.c o m OTTAW A 21 Pine Bluff Trail, Stittsville, O ntario K2S 1E1	OCR Scan	OD-80 OD-323 OT-23 OT-89 OT-143 OT-223 OT-323 TRIAC 97A6 S0805BH 13003 TRANSISTOR TO220 equivalent triacs bt 804 600v Triac bt 808 600C Diode SOT-23 marking 15d zener diode 1N PH 48 6Bs smd transistor Z0409MF equivalent BT 808 600C	PDF
IN456 Abstract: 1n3321 1N3320B 1N3341B Text: 1N 3 3 05 thru 1N 3350B and Microsemi Corp. SANTA ANA, CA j /ri,,,«« SCOTTSDALE, AZ / For more information call: / 1N4549B thru iM A C K ftB • 5 5 0 B 602 941-6300 FE A T U R E S SILICON 50 WATT ZENER DIODES • ZENER VOLTAGE 3.9 TO 200V • LOW ZENER IMPEDANCE	OCR Scan	1N4549B 3350B 1N4549B IN45606 MN4S618 1N4552B 1N45530 1N4554B 1N45556 1N4556B IN456 1n3321 1N3320B 1N3341B	PDF
1N33218 Abstract: 1N3305 1N3305B 1N3350B 1N4549B 1N4550B 1N4552B 1N4555B 1N4556B 1N4564B Text: n i C R O S E n i coRP 5TE D MicrosemiCorp. j . r , SANTA ANA, CA • bll5flti5 D 0 0 1 ñ b 3 S3? ■ t„ vwniirt. SCOTTSDALE, AZ F o r m o r e i n f o r m a ti o n c a ll: / NSC 1N 3 3 0 5 thru 1N 3350B and 1N.4549B thru m,*jm e g p n ^ 602 941-6300	OCR Scan	1N3305 1N3350B 1N4549Bthru N4550D 1N4549B 1N4550B 1N4651B 1N4552B t1N4553B 1N4564B 1N33218 1N3305B 1N3350B 1N4555B 1N4556B	PDF

28UNF2A Abstract: No abstract text available Text: 50 WATT, Metal JEDEC TYPE NUMBERt NOMINAL ZENER VOLTAGE Vz VOLTS Case DO-5, 1/4-28 TEST CURRENT Izt mA MAXIMUM ZENER IMPEDANCE Zzt @ I zt IZK ZzK @ Ohms mA Ohms MAXIMUM REVERSE LEAKAGE CURRENT Ir @ V r i* V r2 * * @ 25°C uk TYPICAL TEMPERATURE COEFFICIENT	OCR Scan	1N3305B 1N3306B 1N3307B 1N3308B 1N3309B 1N3310B 1N3311B 1N3312B 1N3313B 1N3314B 28UNF2A	PDF
1N4465 Abstract: 1N4189B 1N4705 1N5988B 1N6006B 1N4477 1N4460 1N5994B 1N4471 1N5995B Text: zener Diodes POWER 400 mW 250 mW y ? DO-35 CASE LOW NOISE LOW LEVEL LOW LEVEL 1.8 1N4614 1N4678 2.0 1N4615 1N4679 2.2 1N4616 1N4680 2.4 1N4617 1N4681 ZENER VOLTAGE 2.7 GENERAL PURPOSE 1N702A 3.0 3.3 3.6 1N703A 3.9 4.3 1N704A 4.7 5.1 1N705A 5.6 6.0 1N706A LOW	OCR Scan	1N707A 1N4100 1N4101 1N4102 1N4103 1N4104 1N4105 1N4106 1N4107 1N4108 1N4465 1N4189B 1N4705 1N5988B 1N6006B 1N4477 1N4460 1N5994B 1N4471 1N5995B	PDF
n4558 Abstract: MIL-STD 19500 Motorola N2977B 1N2990BR MOTOROLA 1n746 1N3336BR LN298 1N3313BR 1N3316BR 1N4557A Text: General-Purpose Regulator Diodes continued Nominal Zener Voltage ('N ote 1) 10 Watt Cathode to Case = 1N3993 & MZT2970 Series Anode to Case = 1N2970 Series (•Notes 2,10,12) Metal Case 56 (DO-4) NOTES 50 Watt Cathode to Case = MZT4549 Series Anode to Case	OCR Scan	1N3993 MZT2970 1N2970 MZT4549 1N4557A 221B-01 O-220AC) 1N3993 1N3994 1N3995 n4558 MIL-STD 19500 Motorola N2977B 1N2990BR MOTOROLA 1n746 1N3336BR LN298 1N3313BR 1N3316BR	PDF
1n4662b Abstract: IN3347 MIL-S-1955 1N3305 1N3306B 1N3350B 1N4553B 1N4554B 1N4556B 1N4565B Text: 1N3305 thru 1N3350B Corn MlCPDSBflli mini UOBIIII UUI \|l. 1N4549B thru 1N4556B SILICO N 50 WATT ZENEER D IO D E S FEATURES . ZENER VOLTAGE 3.9 TO 200V . LOW ZENER IMPEDANCE • HIGHLY RELIABLE AND RUGGED • FOR MILITARY AND OTHER DEMANDING APPLICATIONS See Below	OCR Scan	1N3305 1N3350B n454qb 1N4556B 1n4662b IN3347 MIL-S-1955 1N3306B 1N3350B 1N4553B 1N4554B 1N4556B 1N4565B	PDF
50 Watt Zener Diode Abstract: 10 watt zener diode LN298 1N2990B TLC 1050 diode Lz zener ZENER DIODE 1N2976B zener diode 1n4553B 6.8 B1 zener 1N2991B Text: CENTRAL SEMICONDUCTOR T ï de \| n t m t 3 □□oost.b s /,f 10 Watt Zener Diode • 5% Tolerance • Case D Do-4 TYPE NO. Zener Voltage V z @ lz Test Current lz Zener Impedance Zz Maximum Zener Current IZM TYPE NO. Zener Voltage V z @ lz Test Current lz	OCR Scan	1N3993A 1N3994A 1N3995A 1N3996A 1N3997A 1N2990B 1N2991B 1N2992B 1N2993B 1N2994B 50 Watt Zener Diode 10 watt zener diode LN298 TLC 1050 diode Lz zener ZENER DIODE 1N2976B zener diode 1n4553B 6.8 B1 zener	PDF
zener 245 Abstract: 245 zener 10 watt zener diode ZENER DIODE 1N2976B diode Lz zener LN298 50 Watt Zener Diode 1N2828B 1N2990B 1N2991B Text: CENTRAL SEMICONDUCTOR T ï de \| n t m t 3 □□oost.b s /,f 10 Watt Zener Diode • 5% Tolerance • Case D Do-4 Maximum Zener Current Test Current lz Zener Impedance Zz Volts mA 1N2990B 1N2991B 1N2992B 1N2993B 1N2994B 33 36 39 43 45 75 70 65 60 55 Ohms	OCR Scan	1N3993A 1N3994A 1N3995A 1N3996A 1N3997A 1N2990B 1N2991B 1N2992B 1N2993B 1N2994B zener 245 245 zener 10 watt zener diode ZENER DIODE 1N2976B diode Lz zener LN298 50 Watt Zener Diode 1N2828B	PDF
MC2259 Abstract: MC880P MC9713P mc2257 1N4003 germanium diode specification 2N1256 S P 1N4465 MC9802P MC9718P 3N214 Text: Semiconductor Data Library Master Index prepared by Technical Information Center The information in this book has been carefully checked and is believed to be reliable; however, no responsibility is assumed for inaccuracies. Furthermore, this information does not convey to the	OCR Scan		PDF
transistor c2060 Abstract: Transistor Shortform Datasheet & Cross References 1N4465 C1906 transistor Germanium itt 3N58 IN939 MC1230F 2N3866 MOTOROLA C943 transistor Text: Data Book Updating Service I Table of Contents How to Use the Data Book I > INTRODUCTION Complete I N . . . INDEX numerical index o f all ElA-registered device types, with major electrical specifications 2N . . . & 3N . . . INDEX Complete numerical index of all ElA-registered device types,	OCR Scan	AN-134 transistor c2060 Transistor Shortform Datasheet & Cross References 1N4465 C1906 transistor Germanium itt 3N58 IN939 MC1230F 2N3866 MOTOROLA C943 transistor	PDF
BTA08-600C equivalent Abstract: BTA16-600B equivalent BDW84C equivalent TYN 208 equivalent FR207 equivalent 2N3668 MDA2506 mda 2060 1n5399 equivalent 1N4465 Text: index/cross Reference Industry Part Number Central Part Number Page Industry Part Number 1N 34A 118 1N 60 118 1N 67A Central Part Number Page Industry Part Number 1N 968B 122 1N2838B 129 1N 969B 122 1N2839B 129 118 1N 970B 122 1N2840B 129 1N 87A 118 1N 971B	OCR Scan	Z0409ME Z0409MF Z0409NE Z0409NF Z0410BE Z0410BF Z0410DE Z0410DF Z0410ME Z0410MF BTA08-600C equivalent BTA16-600B equivalent BDW84C equivalent TYN 208 equivalent FR207 equivalent 2N3668 MDA2506 mda 2060 1n5399 equivalent 1N4465	PDF
zener diodes 1n2831b Abstract: 1n751a zener 1N4475 CZ5372B 1N4465 CZ5379B CZ5384B 1N4620 1N4169B 1N5009A Text: zener Diodes POWER CASE ZENER VOLTAGE 400 mW 250 mW DO-35 GENERAL PURPOSE LOW NOISE LOW LEVEL LOW LEVEL 1.8 1N4614 1N4678 2.0 1N4615 1N4679 2.2 1N4616 1N4680 1N4617 1N4681 2.4 2.7 1N702A 3.0 3.3 3.6 1N703A 3.9 4.3 1N704A 4.7 5.1 1N705A 5.6 6.0 1N706A 1N4618	OCR Scan	1N707A 1N4100 1N4101 1N4102 1N4103 1N4104 1N4105 1N4106 1N4107 1N4108 zener diodes 1n2831b 1n751a zener 1N4475 CZ5372B 1N4465 CZ5379B CZ5384B 1N4620 1N4169B 1N5009A	PDF

Privacy Settings

1N3324B Search Results

1N3324B Price and Stock

Microchip Technology Inc 1N3324B

Microchip Technology Inc MS1N3324B

Solid State Devices Inc (SSDI) 1N3324B

Microchip Technology Inc JAN1N3324B

Microchip Technology Inc MS1N3324BT1

1N3324B Datasheets (24)

1N3324B Datasheets Context Search

Untitled

Arduino Mega2560

1N5048

1N3326B

Untitled

Untitled

1N3350B

1N5363B

1N3336B

Untitled

1N2828B

TRIAC 97A6

IN456

1N33218

28UNF2A

1N4465

n4558

1n4662b

50 Watt Zener Diode

zener 245

MC2259

transistor c2060

BTA08-600C equivalent

zener diodes 1n2831b