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Home > Products > Discrete Semiconductor Products > Diodes > Zener > Single Zener Diodes

Microchip Technology 1N3157A

Name: 1N3157A
Brand: Microchip Technology
SKU: 1N3157A
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 1N3157A

Manufacturer:: Microchip Technology

Category:: Single Zener Diodes

Package:: DO-204AA, DO-7, Axial

Datasheet:: 1N3157A.pdf

Description:: DIODE ZENER 8.4V 500MW DO7

Quantity:: RFQ Add To RFQ list

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Inventory:9,952

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Product details

Overview

1N3157A from Microsemi is a JEDEC-registered, temperature-compensated 8.4 V Zener reference diode in a hermetically sealed DO-7 (DO-204AA) glass axial package, rated for ±5% voltage tolerance, 0.001 %/°C temperature coefficient, and 10 mA test current - used in precision instrumentation voltage references requiring minimal drift over -55°C to +150°C.

For engineers reviewing the 1N3157A datasheet, 1N3157A pinout, 1N3157A application, or 1N3157A equivalent, key selection criteria include its ultra-low TC (0.001 %/°C), tight 8.00–8.80 V Zener voltage range at 10 mA, DO-7 mechanical robustness, military-grade qualification path (JANTXV), and RoHS-compliant e3 variant availability.

Technical Context

This device operates as a two-terminal, passive voltage reference with metallurgically bonded junctions optimized for thermal stability. Its compensation architecture achieves <17 mV total voltage shift across -55°C to +150°C at I_Z = 10 mA, with Zener impedance ≤15 Ω and reverse leakage ≤10 μA at 5.5 V.

The 1N3157A is specified for DC operation only, requires cathode-band-positive polarity, and delivers stable regulation under fixed-current biasing - not intended for dynamic load regulation or transient suppression. Its performance is validated per MIL-PRF-19500/158 for JANTXV-qualified variants.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage V_Z	8.00–8.80 V at I_ZT = 10 mA - defines nominal 8.4 V reference with ±5% initial tolerance.
Temp Coefficient αV_Z	0.001 %/°C - enables <17 mV total drift over full -55°C to +150°C operating range.
Zener Impedance Z_ZT	≤15 Ω - ensures low dynamic resistance for stable regulation under small-signal current variations.
Reverse Leakage I_R	≤10 μA at 5.5 V - guarantees negligible error contribution in high-impedance reference circuits.
Power Dissipation	500 mW @ T_L = 25°C - supports continuous operation at 10 mA without thermal runaway in DO-7 package.
Operating Temp Range	-55°C to +150°C - qualified for aerospace, downhole, and extended-temperature industrial systems.

Pinout & Package

Hermetically sealed glass DO-7 (DO-204AA) axial-leaded package with cathode band marking; terminals are tin-lead (military) or annealed matte-tin (RoHS e3); polarity requires banded end positive.

Pin/Terminal	Circuit Role	Design Meaning
Anode (unbanded end)	Reference ground node	Connected to circuit common; establishes reference potential relative to cathode.
Cathode (banded end)	Reference output node	Provides stabilized 8.4 V output when biased with 10 mA current source into anode.

Key Features

Feature	Design Value
Ultra-low temp coefficient	0.001 %/°C enables sub-20 mV total drift over -55°C to +150°C - critical for calibration-grade references.
Hermetic DO-7 glass seal	Ensures long-term parameter stability and moisture immunity in harsh environments including aerospace and oilfield electronics.
MIL-PRF-19500/158 qualification path	Supports JANTXV-level screening via prefix/suffix (e.g., JANTXV1N3157A-1) - required for defense and space programs.
Nonsensitive to ESD	Complies with MIL-STD-750 Method 1020 - eliminates need for on-board ESD protection in system design.

Applications

High-Accuracy Data Acquisition	Aerospace Sensor Conditioning
Use Scenario: Precision ADC/DAC reference in 16-bit+ data loggers and test equipment. IC Role / Device Role / Timing Role: Primary voltage reference for analog front-end signal conditioning and conversion. Use Value: Sub-20 mV total drift over temperature ensures <0.01% FS error contribution across full operating range.	Use Scenario: Onboard inertial measurement unit (IMU) and pressure transducer signal chain. IC Role / Device Role / Timing Role: Stable bias reference for op-amp gain-setting and sensor excitation networks. Use Value: Hermetic DO-7 package and -55°C to +150°C rating support operation in avionics bays and satellite payloads.
Downhole Oilfield Electronics	Military Power Supply Monitoring
Use Scenario: High-temperature wellhead control systems and logging-while-drilling (LWD) tools. IC Role / Device Role / Timing Role: Reference element in voltage supervisors and analog telemetry interfaces. Use Value: Validated operation up to +150°C with no derating - avoids thermal drift-induced false alarms or calibration loss.	Use Scenario: Voltage monitoring in ruggedized power supplies for radar and comms subsystems. IC Role / Device Role / Timing Role: Calibration reference for fault-detection comparators and feedback dividers. Use Value: JANTXV qualification path and radiation-hardened RH3157A variant enable compliance with MIL-STD-461 and DO-160.

High-Accuracy Data Acquisition

Aerospace Sensor Conditioning

Use Scenario: Precision ADC/DAC reference in 16-bit+ data loggers and test equipment.

IC Role / Device Role / Timing Role: Primary voltage reference for analog front-end signal conditioning and conversion.

Use Value: Sub-20 mV total drift over temperature ensures <0.01% FS error contribution across full operating range.

Use Scenario: Onboard inertial measurement unit (IMU) and pressure transducer signal chain.

IC Role / Device Role / Timing Role: Stable bias reference for op-amp gain-setting and sensor excitation networks.

Use Value: Hermetic DO-7 package and -55°C to +150°C rating support operation in avionics bays and satellite payloads.

Downhole Oilfield Electronics

Military Power Supply Monitoring

Use Scenario: High-temperature wellhead control systems and logging-while-drilling (LWD) tools.

IC Role / Device Role / Timing Role: Reference element in voltage supervisors and analog telemetry interfaces.

Use Value: Validated operation up to +150°C with no derating - avoids thermal drift-induced false alarms or calibration loss.

Use Scenario: Voltage monitoring in ruggedized power supplies for radar and comms subsystems.

IC Role / Device Role / Timing Role: Calibration reference for fault-detection comparators and feedback dividers.

Use Value: JANTXV qualification path and radiation-hardened RH3157A variant enable compliance with MIL-STD-461 and DO-160.

Equivalent & Alternatives

The following parts are listed as comparable options for similar Zener reference applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
1N3156A	0.002 %/°C TC, 26 mV max ΔV_ZT over -55°C to +150°C - higher drift than 1N3157A.	Suitable where ±0.02% accuracy suffices; lower cost alternative for non-critical references.	Select when tighter TC is unnecessary and budget constraints dominate.
LM399H	Subsurface Zener with buried Zener and heater; 0.3 ppm/°C TC, 2 ppm/√kHr noise - monolithic IC vs. discrete diode.	Used in metrology-grade instruments; requires external heater control and 10 V supply.	Choose only when ultra-high stability (<1 ppm/°C) justifies added complexity and cost.

Compared with 1N3156A and LM399H, the 1N3157A delivers the lowest TC among JEDEC-standard discrete Zeners while maintaining simple two-terminal operation, DO-7 compatibility, and direct drop-in use in legacy reference designs - making it optimal for high-reliability analog systems needing proven, field-deployed stability.

Availability

1N3157A is available at Aetrix Electronics and suitable for high-accuracy data acquisition, aerospace sensor conditioning, and downhole oilfield electronics requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for 1N3157A includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Microsemi (now part of Microchip Technology) is a U.S.-based semiconductor company specializing in high-reliability analog, RF, and radiation-hardened components for aerospace, defense, and industrial markets.

The 1N3157A belongs to Microsemi's legacy JEDEC-registered Zener reference diode family, engineered specifically for precision voltage referencing in mission-critical systems where long-term stability and extreme temperature resilience are mandatory.

FAQ

What is the nominal Zener voltage and tolerance of the 1N3157A?

The 1N3157A has a nominal Zener voltage of 8.4 V with a guaranteed range of 8.00–8.80 V at 10 mA test current, corresponding to ±5% initial tolerance. Tighter tolerances (e.g., ±1%) are available via suffixes like 1N3157A-1%, but the base 1N3157A part meets the standard JEDEC specification.

What is the temperature coefficient of the 1N3157A and how does it affect system accuracy?

The 1N3157A exhibits a maximum effective temperature coefficient of 0.001 %/°C, resulting in ≤17 mV total Zener voltage change across its full -55°C to +150°C operating range at 10 mA. This enables <0.01% full-scale error contribution in precision analog systems without active temperature compensation.

Is the 1N3157A available in military-grade or radiation-hardened versions?

Yes - the 1N3157A qualifies for JANTXV-level screening per MIL-PRF-19500/158 when ordered with appropriate prefixes/suffixes (e.g., JANTXV1N3157A-1). Radiation-hardened variants are designated RH3157A (replacing "1N" with "RH") and require factory consultation for full qualification data.

What package type and mounting style does the 1N3157A use?

The 1N3157A uses the DO-7 (DO-204AA) hermetically sealed glass axial-leaded package with flexible through-hole mounting. It features a visible cathode band, tin-lead or RoHS-compliant matte-tin plating, and weighs 0.2 g - compatible with standard wave soldering at 260°C for 10 s.

How does the 1N3157A compare to integrated voltage references like the LM399H?

The 1N3157A is a discrete, two-terminal Zener diode offering simplicity, DO-7 compatibility, and proven field reliability, whereas the LM399H is a monolithic IC with internal heater and buried Zener delivering 0.3 ppm/°C TC. The 1N3157A avoids external bias complexity and suits applications where <17 mV total drift is sufficient and legacy board layouts must be preserved.

1N3157A Specifications

Product attributes: Attribute value

Manufacturer:: Microchip Technology

Series:: -

Package/Case:: DO-204AA, DO-7, Axial

Packaging:: Bulk

Product Status:: Active

Voltage - Zener (Nom) (Vz):: 8.4 V

Tolerance:: ±5%

Power - Max:: 500 mW

Impedance (Max) (Zzt):: 15 Ohms

Current - Reverse Leakage @ Vr:: 10 µA @ 5.5 V

Voltage - Forward (Vf) (Max) @ If:: -

Operating Temperature:: -65°C ~ 175°C

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: DO-7

1N3157A FAQ

1.How can I place an order for 1N3157A through Aetrix?

Please submit a Request for Quotation (RFQ) for 1N3157A on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for 1N3157A reliable?

The price and inventory of 1N3157A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N3157A is usually 5 days.

3.What payment methods are accepted for 1N3157A?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N3157A transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 1N3157A?

1N3157A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 1N3157A order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for 1N3157A?

For technical support, including 1N3157A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N3157A requirements.

6.How does Aetrix verify that 1N3157A is sourced from the original manufacturer or authorized distributors?

All 1N3157A products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that 1N3157A meets industry standards.

7.What is the process for return or replacement of 1N3157A?

All 1N3157A units undergo pre-shipment inspection (PSI). If there is an issue with 1N3157A, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The 1N3157A part is unused and in its original packaging.

Return procedure for 1N3157A:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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