1N957B

Voltage Temperature Coefficient :
Zener Voltage : 6.8 V
Voltage Tolerance : 5 %
Maximum Zener Impedance : 4.5 Ohms
Power Dissipation : 500 mW
Maximum Operating Temperature : + 200 C
Mounting Style : Through Hole
Packaging : Bulk
Package / Case : DO-35
Zener Current : 47 mA
Maximum Reverse Leakage Current : 150 uA


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





Application

* 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 Method1020
* Minimal capacitance (see Figure 3)
* Inherently radiation hard as described in
Microsemi MicroNote 050

Specifications

Operating and Storage temperature: -65 to +175
Thermal Resistance: 250/W junction to lead at 3/8 (10 mm) lead length from body, or 310/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 < 50 3/8 inch (10 mm) from body or 0.48 W at T_A 25 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 for 10 s (max)





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 of the 1N957B are also available with an internal-metallurgical-bond option by adding a "-1" suffix. The 1N957B is available in JAN, JANTX, and JANTXV military qualifi cations. Microsemi also offers numerous other Zener products to meet higher and lower power applications.




Parameters:

Technical/Catalog Information	1N957B
Vendor	Fairchild Semiconductor
Category	Discrete Semiconductor Products
Voltage - Zener (Nom) (Vz)	6.8V
Power - Max	500mW
Impedance (Max) (Zzt)	4.5 Ohm
Voltage - Forward (Vf) (Max) @ If	-
Current - Reverse Leakage @ Vr	150A @ 5.2V
Tolerance	±5%
Mounting Type	Through Hole, Axial
Package / Case	DO-35, Axial
Packaging	Bulk
Operating Temperature	-65°C ~ 200°C
Lead Free Status	Lead Free
RoHS Status	RoHS Compliant
Other Names	1N957B 1N957B