1N957B - 1N979B Zener Diodes Tolerance = 5% DO-35 Glass case COLOR BAND DENOTES CATHODE Absolute Maximum Ratings * Symbol PD TA = 25C unless otherwise noted Parameter Power Dissipation @ TL 75C, Lead Length = 3/8" Value 500 Units mW 4.0 mW/C -65 to +200 C Derate above 75C TJ, TSTG Operating and Storage Temperature Range * These ratings are limiting values above which the serviceability of the diode may be impaired. Electrical Characteristics VZ (Volts) Device TA=25C unless otherwise noted ZZ () (Note 1) Min. Typ. Max. @ IZ (mA) 1N957B 1N958B 1N959B 1N960B 1N961B 6.46 7.125 7.79 8.645 9.5 6.8 7.5 8.2 9.1 10 7.14 7.875 8.61 9.555 10.5 18.5 16.5 15 14 12.5 1N962B 1N963B 1N964B 1N965B 1N966B 10.45 11.4 12.35 14.25 15.2 11 12 13 15 16 11.55 12.6 13.65 15.75 16.8 1N967B 1N968B 1N969B 1N970B 1N971B 17.1 19 20.9 22.8 25.652 18 20 22 24 27 1N972B 1N973B 1N974B 1N975B 1N976B 8.5 31.35 34.2 37.05 40.85 1N977B 1N978B 1N979B 44.65 48.45 53.2 ZZK @ IZK IZM (mA) A Volts (Note 3) 4.5 5.5 6.5 7.5 8.5 700 700 700 700 700 mA 1.0 0.5 0.5 0.5 0.25 150 75 50 25 10 5.2 5.7 6.2 6.9 7.6 47 42 38 35 32 11.5 10.5 9.5 8.5 7.8 9.5 11.5 13 16 17 700 700 700 700 700 0.25 0.25 0.25 0.25 0.25 5 5 5 5 5 8.4 9.1 9.9 11.4 12.2 28 26 24 21 19 18.9 21 23.1 25.2 28.35 7.0 6.2 5.6 5.2 4.6 21 25 29 33 41 750 750 750 750 750 0.25 0.25 0.25 0.25 0.25 5 5 5 5 5 13.7 15.2 16.7 18.2 20.6 17 15 14 13 11 30 33 36 39 43 31.5 34.65 37.8 40.95 45.15 4.2 3.8 3.4 3.2 3.0 49 58 70 80 93 1000 1000 1000 1000 1500 0.25 0.25 0.25 0.25 0.25 5 5 5 5 5 22.8 25.1 27.4 29.7 32.7 10 9.2 8.5 7.8 7.0 47 51 56 49.35 53.55 58.8 2.7 2.5 2.2 105 125 150 1500 1500 2000 0.25 0.25 0.25 5 5 5 35.8 38.8 42.6 6.4 5.9 5.4 (c)2007 Fairchild Semiconductor Corporation 1N957B - 1N979B Rev. F1 Z Z @ IZ IR @ V R (Note 2) 1 www.fairchildsemi.com 1N957B - 1N979B Zener Diodes June 2007 Top Mark Information 1N957B 1N958B 1N959B 1N960B 1N961B Device Line 1 LOGO LOGO LOGO LOGO LOGO Line 2 57 58 59 60 61 Line 3 B B B B B 1N962B 1N963B 1N964B 1N965B 1N966B LOGO LOGO LOGO LOGO LOGO 62 63 64 65 66 B B B B B 1N967B 1N968B 1N969B 1N970B 1N971B LOGO LOGO LOGO LOGO LOGO 67 68 69 70 71 B B B B B 1N972B 1N973B 1N974B 1N975B 1N976B LOGO LOGO LOGO LOGO LOGO 72 73 74 75 76 B B B B B 1N977B 1N978B 1N979B LOGO LOGO LOGO 77 78 79 B B B 2 1N957B - 1N979B Rev. F1 www.fairchildsemi.com 1N957B - 1N979B Zener Diodes Notes: 1. Zener Voltage (VZ) Measurement Nominal zener voltage is measured with the device junction in the thermal equilibrium at the lead temperature (TL) at 30C 1C and 3/8" lead length. 2. Zener Impedance (ZZ) Derivation ZZT and ZZK are measured by dividing the ac voltage drop across the device by the ac current applied. The specified limits are for IZ(ac) = 0.1 IZ(dc) with the ac frequency = 60Hz. 3. Maximum Zener Current Ratings (IZM) The maximum current handling capability on a worst case basis is limited by the actual zener voltage at the operation point and the power derating curve. 1N957B - 1N979B Zener Diodes Top Mark Information (Continued) 1st line: F - Fairchild Logo F 22 2nd line: Device Name - 4th to 5th characters of the device name. or 5th to 6th characters for BZXyy series 9B 3rd line: Device Name - 6th to 7th characters of the device name. or Voltage rating for BZXyy series General Requirements: 1.0 Cathode Band 2.0 First Line: F - Fairchild Logo 3.0 Second Line: Device name - For 1Nxx series: 4th to 5th characters of the device name. For BZxx series: 5th to 6th characters of the device name. 4.0 Third Line: Device name - For 1Nxx series: 6th to 7th characters of the device name. For BZXyy series: Voltage rating 5.0 Devices shall be marked as required in the device specification (PID or FSC Test Spec). 6.0 Maximum no. of marking lines: 3 7.0 Maximum no. of digits per line: 2 8.0 FSC logo must be 20 % taller than the alphanumeric marking and should occupy the 2 characters of the specified line. 9.0 Marking Font: Arial (Except FSC Logo) 10.0 First character of each marking line must be aligned vertically. 11.0 All device markings must be based on Fairchild device specification. 3 1N957B - 1N979B Rev. F1 www.fairchildsemi.com The following are registered and unregistered trademarks Fairchild Semiconductor owns or is authorized to use and is not intended to be an exhaustive list of all such trademarks. ACExTM Across the board. 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FAIRCHILD DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN;NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS. THESE SPECIFICATIONS DO NOT EXPAND THE TERMS OF FAIRCHILD'S WORLDWIDE TERMS AND CONDITIONS, SPECIFICALLY THE WARRANTY THEREIN, WHICH COVERS THESE PRODUCTS. LIFE SUPPORT POLICY FAIRCHILD'S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF FAIRCHILD SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, or (c) whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in significant injury to the user. 2. A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. PRODUCT STATUS DEFINITIONS Definition of Terms Datasheet Identification Product Status Definition Advance Information Formative or In Design This datasheet contains the design specifications for product development. Specifications may change in any manner without notice. Preliminary First Production This datasheet contains preliminary data, and supplementary data will be published at a later date.Fairchild Semiconductor reserves the right to make changes at any time without notice in order to improve design. No Identification Needed Full Production This datasheet contains final specifications. Fairchild Semiconductor reserves the right to make changes at any time without notice in order to improve design. Obsolete Not In Production This datasheet contains specifications on a product that has been discontinued by Fairchild semiconductor.The datasheet is printed for reference information only. Rev. I23 4 1N957B - 1N979B Rev. F1 www.fairchildsemi.com 1N957B - 1N979B Zener Diodes TRADEMARKS