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1N957B, -1 thru 1N992B, -1 DO-35 Silicon 500 mW Zener Diodes
SCOTTSDALE DIVISION
DESCRIPTION The popular 1N957B thru 1N992B series of 0.5 watt Zener Voltage Regulators provides a selection from 6.8 to 200 volts in standard 5% or 10% tolerances as well as tighter tolerances identified by different suffix letters on the part number. These glass axial-leaded DO-35 Zeners are also available with an internal-metallurgical-bond option by adding a "-1" suffix. The 1N962B-1 thru 1N992B-1 are available in JAN, JANTX, and JANTXV military qualifications. Microsemi also offers numerous other Zener products to meet higher and lower power applications.
IMPORTANT: For the most current data, consult MICROSEMI's website: http://www.microsemi.com
APPEARANCE
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DO-35 (DO-204AH)
FEATURES
* JEDEC registered 1N957B(-1) to 1N992B(-1) series * Internal metallurgical bond option available by adding a "-1" suffix * Also available in JAN, JANTX, and JANTXV qualifications per MIL-PRF-19500/117 by adding the JAN, JANTX, or JANTXV prefixes to part numbers for desired level of screening as well as "-1" suffix; (e.g. JANTX1N962B-1, JANTXV1N986C-1, etc.) * Military Surface Mount equivalents also available in DO-213AA by adding a UR-1 suffix in addition to the JAN, JANTX, and JANTXV prefix; e.g. JANTX1N962BUR-1 (see separate data sheet) * Commercial Surface Mount equivalents available as MLL957B to MLL992B or with "-1" suffix for bonded in the DO-213AA MELF style package (consult factory for others) * DO-7 glass body axial-leaded Zener equivalents are also available * * * * * * * *
APPLICATIONS / BENEFITS
Regulates voltage over a broad operating current and temperature range Extensive selection from 6.8 to 200 V Standard voltage tolerances are plus/minus 5% with B suffix, 10 % with A suffix identification Tight tolerances available in plus or minus 2% or 1% with C or D suffix respectively Flexible axial-lead mounting terminals Nonsensitive to ESD per MIL-STD-750 Method 1020 Minimal capacitance (see Figure 3) Inherently radiation hard as described in Microsemi MicroNote 050
MAXIMUM RATINGS
* Operating and Storage temperature: -65 C to +175C * Thermal Resistance: 250 C/W junction to lead at 3/8 (10 mm) lead length from body, or 310C/W junction to ambient when mounted on FR4 PC board (1 oz Cu) with 4 mm2 copper pads and track width 1 mm, length 25 mm * Steady-State Power: 0.5 watts at TL < 50oC 3/8 inch (10 mm) from body or 0.48 W at TA < 25C when mounted on FR4 PC board as described for thermal resistance above (also see Figure1) * Forward voltage @200 mA: 1.1 volts (maximum) for 1N957B - 1N985B and 1.3 V for 1N985 - 1N992B * Solder Temperatures: 260 C for 10 s (max)
MECHANICAL AND PACKAGING
* * * CASE: Hermetically sealed axial-lead glass DO-35 (DO-204AH) package TERMINALS: Leads, tin-lead plated solderable per MIL-STD-750, method 2026 POLARITY: Cathode indicated by band. Diode to be operated with the banded end positive with respect to the opposite end for Zener regulation MARKING: Part number TAPE & REEL option: Standard per EIA-296 (add "TR" suffix to part number) WEIGHT: 0.2 grams See package dimensions on last page
1N957B - 992B (DO-35)
* * * *
Copyright 2003 10-31-2003 REV B
Microsemi
Scottsdale Division 8700 E. Thomas Rd. PO Box 1390, Scottsdale, AZ 85252 USA, (480) 941-6300, Fax: (480) 947-1503
Page 1
1N957B, -1 thru 1N992B, -1 DO-35 Silicon 500 mW Zener Diodes
SCOTTSDALE DIVISION
WWW . Microsemi .C OM
ELECTRICAL CHARACTERISTICS* @ 25oC
JEDEC TYPE NUMBER (Note 1) 1N957B 1N958B 1N959B 1N960B 1N961B 1N962B 1N963B 1N964B 1N965B 1N966B 1N967B 1N968B 1N969B 1N970B 1N971B 1N972B 1N973B 1N974B 1N975B 1N976B 1N977B 1N978B 1N979B 1N980B 1N981B 1N982B 1N983B 1N984B 1N985B 1N986B 1N987B 1N988B 1N989B 1N990B 1N991B 1N992B NOMINAL ZENER VOLTAGE (Note 2) ZENER TEST CURRENT MAX. ZENER IMPEDANCE (Note 3) MAX. DC ZENER CURRENT (Note 4) MAX. SURGE CURRENT (Note 5) MAX. REVERSE LEAKAGE CURRENT IR @ VR A VOLTS 150 5.2 75 5.7 50 6.2 25 6.9 10 7.6 8.4 5 9.1 5 9.9 5 11.4 5 12.2 5 13.7 5 15.2 5 16.7 5 18.2 5 20.6 5 22.8 5 25.1 5 27.4 5 29.7 5 32.7 5 35.8 5 38.8 5 42.6 5 47.1 5 51.7 5 56.0 5 62.2 5 69.2 5 76.0 5 83.6 5 91.2 5 98.8 5 114.0 5 121.6 5 136.8 5 152.0 5 MAX. TEMP. COEFFICIENT %/oC +0.05 +0.058 +0.065 +0.068 +0.075 +0.076 +0.077 +0.079 +0.082 +0.083 +0.085 +0.086 +0.087 +0.088 +0.090 +0.091 +0.092 +0.093 +0.094 +0.095 +0.095 +0.096 +0.096 +0.097 +0.097 +0.098 +0.098 +0.099 +0.11 +0.11 +0.11 +0.11 +0.11 +0.11 +0.11 +0.11
VZ
VOLTS 6.8 7.5 8.2 9.1 10 11 12 13 15 16 18 20 22 24 27 30 33 36 39 43 47 51 56 62 68 75 82 91 100 110 120 130 150 160 180 200
IZT
mA 18.5 16.5 15.0 14.0 12.5 11.5 10.5 9.5 8.5 7.8 7.0 6.2 5.6 5.2 4.6 4.2 3.8 3.4 3.2 3.0 2.7 2.5 2.2 2.0 1.8 1.7 1.5 1.4 1.3 1.1 1.0 0.95 0.85 0.80 0.68 0.65
ZZT @ IZT
OHMS 4.5 5.5 6.5 7.5 8.5 9.5 11.5 13.0 16 17 21 25 29 33 41 49 58 70 80 93 105 125 150 185 230 270 330 400 500 750 900 1100 1500 1700 2200 2500
ZZK
OHMS 700 700 700 700 700 700 700 700 700 700 750 750 750 750 750 1000 1000 1000 1000 1500 1500 1500 2000 2000 2000 2000 3000 3000 3000 4000 4500 5000 6000 6500 7100 8000
@ IZK
mA 1.0 .5 .5 .5 .25 .25 .25 .25 .25 .25 .25 .25 .25 .25 .25 .25 .25 .25 .25 .25 .25 .25 .25 .25 .25 .25 .25 .25 .25 .25 .25 .25 .25 .25 .25 .25
IZM
mA 55 50 45 41 38 32 31 28 25 24 20 18 16 15 13 12 11 10 9.5 8.8 7.9 7.4 6.8 6.0 5.5 5.0 4.6 4.1 3.7 3.3 3.1 2.7 2.4 2.2 2.0 1.8
IZSM
mA 300 275 250 225 200 175 160 150 130 120 110 100 90 80 70 65 60 55 46 44 40 37 35 30 28 26 23 21 18 16 15 13 12 11 10 9
VZ
* JEDEC Registered Data
NOTE 1: The JEDEC type numbers shown (B suffix) have a +/-5% tolerance on nominal Zener voltage. The suffix A is used to identify +/10% tolerance; suffix C is used to identify +/-2%; and suffix D is used to identify +/-1% tolerance; no suffix indicates +/-20% tolerance. NOTE 2: Zener voltage (VZ) is measured after the test current has been applied for 20 +/- 5 seconds. The device shall be suspended by its leads with the inside edge of the mounting clips between .375" and .500" from the body. Mounting clips shall be maintained at a o temperature of 25 +8/ -2 C. NOTE 3: The zener impedance is derived when a 60 cycle ac current having an rms value equal to 10% of the dc zener current (IZT or IZK) is superimposed on IZT or IZK. Zener impedance is measured at 2 points to ensure a sharp knee on the breakdown curve and to eliminate unstable units. See MicroNote 202 for variation in dynamic impedance with different zener currents. NOTE 4: The values of IZM are calculated for a +/- 5% tolerance on nominal zener voltage. Allowance has been made for the rise in zener voltage above VZT which results from zener impedance and the increase in junction temperature as power dissipation approaches o 400 mW. In the case of individual diodes IZM is that value of current which results in a dissipation of 400 mW at 75 C lead temperature at 3/8" from body. NOTE 5: The surge for IZSM is a square wave or equivalent half-sine wave pulse of 1/120 sec. duration.
1N957B - 992B (DO-35)
Copyright 2003 10-31-2003 REV B
Microsemi
Scottsdale Division 8700 E. Thomas Rd. PO Box 1390, Scottsdale, AZ 85252 USA, (480) 941-6300, Fax: (480) 947-1503
Page 2
1N957B, -1 thru 1N992B, -1 DO-35 Silicon 500 mW Zener Diodes
SCOTTSDALE DIVISION
GRAPHS
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RATED POWER DISSIPATION - mW
TEMPERATURE COEFFICIENT mV/ C
TEMPERATURE COEFFICIENT %/ C
Voltage Temperature o Coefficient %/ C
o
mV Change /C
o
TL - LEAD TEMPERATURE ( C) 3/8" FROM BODY or TA on FR4 PC BOARD
o
NOMINAL ZENER VOLTAGE (VOLTS)
FIGURE 1 POWER DERATING CURVE
FIGURE 2 ZENER VOLTAGE TEMPERATURE COEFFICIENT vs. ZENER VOLTAGE PACKAGE DIMENSIONS
1N957B - 992B (DO-35)
All dimensions in: INCH mm FIGURE 3 CAPACITANCE vs. ZENER VOLTAGE (TYPICAL)
Copyright 2003 10-31-2003 REV B
Microsemi
Scottsdale Division 8700 E. Thomas Rd. PO Box 1390, Scottsdale, AZ 85252 USA, (480) 941-6300, Fax: (480) 947-1503
Page 3

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