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

Microchip Technology 1N3157UR-1/TR

Name: 1N3157UR-1/TR
Brand: Microchip Technology
SKU: 1N3157UR-1/TR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 1N3157UR-1/TR

Manufacturer:: Microchip Technology

Category:: Single Zener Diodes

Package:: DO-213AA

Datasheet:: 1N3157UR-1/TR.pdf

Description:: DIODE ZENER 8.4V 500MW DO213AA

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Product details

Overview

1N3157UR-1/TR from Microsemi is an 8.4 V temperature-compensated Zener reference diode in DO-7 (DO-204AA) glass axial-leaded package, rated for ±5% voltage tolerance, 0.001 %/°C temperature coefficient, and 13 mV max voltage drift over –55°C to +100°C. It operates at 10 mA test current with 15 Ω dynamic impedance and is RoHS-compliant with tape-and-reel packaging.

For engineers reviewing the 1N3157UR-1/TR datasheet, 1N3157UR-1/TR pinout, 1N3157UR-1/TR application, or 1N3157UR-1/TR equivalent, key selection criteria include ultra-low TC stability, hermetic glass construction for high-reliability instrumentation, and compatibility with MIL-PRF-19500/158 JANTXV-qualified variants via prefix/suffix modification.

Technical Context

This device belongs to Microsemi's JEDEC-registered 1N3154–1N3157A series of zero-TC Zener references, engineered to minimize voltage drift across wide temperature ranges using metallurgically bonded junctions. Its 0.001 %/°C TC is achieved through precise doping and thermal compensation design, validated at 10 mA I_ZT.

The 1N3157UR-1/TR delivers 13 mV maximum ΔV_ZT over –55°C to +100°C and maintains <15 Ω zener impedance (Z_ZT) under 1 mA AC superimposed on 10 mA DC bias - critical for low-noise analog reference and precision calibration circuits.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	8.00–8.80 V @ 10 mA - nominal 8.4 V with ±5% tolerance ensures stable mid-range reference for 5–12 V systems.
Temp Coefficient (αV_Z)	0.001 %/°C - enables sub-100 ppm/°C drift, suitable for aerospace-grade sensor signal conditioning.
ΔV_ZT Max	13 mV over –55°C to +100°C - guarantees minimal absolute voltage shift without external compensation.
Zener Impedance (Z_ZT)	15 Ω @ 10 mA DC + 1 mA AC - supports low-output-impedance reference for ADC voltage references and DAC buffers.
Power Dissipation	500 mW @ T_L = 25°C - allows operation up to 55 mA I_ZM, but optimized at 10 mA (≤90 mW) for best TC performance.
Reverse Current (I_R)	10 μA @ 5.5 V - ensures low leakage in high-impedance reference divider networks.
Package	DO-7 (DO-204AA) glass axial - hermetically sealed, ESD-insensitive per MIL-STD-750 Method 1020, weight 0.2 g.

Pinout & Package

DO-7 (DO-204AA) glass axial-leaded package with cathode band marking; polarity requires banded end to be positive relative to unbanded end during forward-biased reference operation.

Pin/Terminal	Circuit Role	Design Meaning
Anode (unbanded end)	Reference ground node	Connected to circuit common; establishes reference potential baseline for downstream analog stages.
Cathode (banded end)	Stable voltage output node	Provides regulated 8.4 V output when reverse-biased; must be held at higher potential than anode.

Key Features

Feature	Design Value
Ultra-low temperature coefficient	0.001 %/°C enables ≤13 mV total drift over –55°C to +100°C - eliminates need for external TC correction in flight control sensors.
Hermetic glass DO-7 construction	Sealed against moisture and contaminants per MIL-PRF-19500/158 - supports 175°C storage and extended life in avionics enclosures.
RoHS-compliant matte-tin plating	e3-suffix compatible termination - meets IPC-J-STD-006 solderability requirements for lead-free reflow up to 260°C/10 s.
Tape-and-reel packaging	TR suffix indicates EIA-296 standard reel - enables automated SMT placement despite axial-leaded form factor via carrier tape indexing.

Applications

High-Precision Instrumentation	Aerospace Sensor Calibration
Use Scenario: Benchtop multimeters and portable calibrators requiring traceable 8.4 V reference for 6½-digit ADC excitation. IC Role / Device Role / Timing Role: Primary voltage reference for SAR ADC reference buffer and gain-setting network. Use Value: 0.001 %/°C TC and 13 mV ΔV_ZT ensure <±0.005% full-scale error over lab temperature swings (15–35°C).	Use Scenario: Gyro and accelerometer signal conditioning modules in UAV inertial measurement units (IMUs). IC Role / Device Role / Timing Role: Stable bias reference for op-amp offset nulling and bridge excitation in MEMS transducers. Use Value: Hermetic DO-7 package withstands thermal cycling and outgassing in vacuum-rated housings; 175°C storage rating supports long-term shelf life.
Military Power Supply Monitoring	Industrial Process Controller Reference
Use Scenario: Voltage supervision in JANTXV-qualified power sequencers for radar subsystems. IC Role / Device Role / Timing Role: Reference input for comparator-based undervoltage lockout (UVLO) with hysteresis. Use Value: 10 μA I_R at 5.5 V prevents false triggering during brown-out recovery; military suffix support enables direct qualification reuse.	Use Scenario: Analog I/O modules in PLC backplanes requiring stable 8.4 V for 4–20 mA loop transmitter biasing. IC Role / Device Role / Timing Role: Precision shunt reference for current-source regulation and DAC output scaling. Use Value: 15 Ω Z_ZT ensures <0.15% load regulation error across 1–10 mA output current range.

High-Precision Instrumentation

Aerospace Sensor Calibration

Use Scenario: Benchtop multimeters and portable calibrators requiring traceable 8.4 V reference for 6½-digit ADC excitation.

IC Role / Device Role / Timing Role: Primary voltage reference for SAR ADC reference buffer and gain-setting network.

Use Value: 0.001 %/°C TC and 13 mV ΔV_ZT ensure <±0.005% full-scale error over lab temperature swings (15–35°C).

Use Scenario: Gyro and accelerometer signal conditioning modules in UAV inertial measurement units (IMUs).

IC Role / Device Role / Timing Role: Stable bias reference for op-amp offset nulling and bridge excitation in MEMS transducers.

Use Value: Hermetic DO-7 package withstands thermal cycling and outgassing in vacuum-rated housings; 175°C storage rating supports long-term shelf life.

Military Power Supply Monitoring

Industrial Process Controller Reference

Use Scenario: Voltage supervision in JANTXV-qualified power sequencers for radar subsystems.

IC Role / Device Role / Timing Role: Reference input for comparator-based undervoltage lockout (UVLO) with hysteresis.

Use Value: 10 μA I_R at 5.5 V prevents false triggering during brown-out recovery; military suffix support enables direct qualification reuse.

Use Scenario: Analog I/O modules in PLC backplanes requiring stable 8.4 V for 4–20 mA loop transmitter biasing.

IC Role / Device Role / Timing Role: Precision shunt reference for current-source regulation and DAC output scaling.

Use Value: 15 Ω Z_ZT ensures <0.15% load regulation error across 1–10 mA output current range.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
1N3157A-1/TR	Same 8.4 V nominal, tighter 0.001 %/°C TC, extended temp range (–55°C to +150°C), A-grade screening.	Required for extended-temperature industrial controllers operating above +100°C ambient.	Select when full MIL-PRF-19500/158 Class A screening and +150°C upper limit are mandatory.
LM385B-8.2/NOPB	8.2 V adjustable shunt reference IC, 0.02 %/°C TC, 20 ppm/°C typical, SOIC-8 package, active temperature compensation.	Suitable for PCB space-constrained designs needing integrated bias current and lower TC drift than discrete Zeners.	Choose for surface-mount layouts where DO-7 axial leads are incompatible, accepting 8.2 V nominal and higher cost for IC-level integration.

Compared with 1N3157UR-1/TR, the 1N3157A-1/TR extends operational temperature range and adds Class A screening, while the LM385B-8.2/NOPB trades hermetic reliability and axial mounting for SMT compatibility and active TC correction - making each optimal for distinct mechanical, environmental, and integration constraints.

Availability

1N3157UR-1/TR is available at Aetrix Electronics and suitable for high-reliability instrumentation, aerospace sensor calibration, and military power monitoring requiring stable component supply with RoHS-compliant tape-and-reel delivery.

Supply support for 1N3157UR-1/TR 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 defense, aerospace, and industrial markets.

The 1N3157UR-1/TR belongs to Microsemi's legacy 1N3154–1N3157A Zener reference diode family, designed specifically for ultra-stable voltage referencing in mission-critical analog signal chains where hermeticity and sub-0.01 %/°C TC are non-negotiable.

FAQ

What is the nominal Zener voltage and tolerance of the 1N3157UR-1/TR?

The 1N3157UR-1/TR 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% tolerance. This specification is defined per JEDEC registration and applies to all devices in the 1N3157 series unless tighter tolerances (e.g., -1%, -2%) are explicitly ordered with suffixes.

What does the "UR-1/TR" suffix mean in 1N3157UR-1/TR?

The "UR" denotes Microsemi's internal revision or process variant; "-1" indicates compliance with MIL-PRF-19500/158 JANTX-level screening requirements; and "TR" specifies EIA-296 standard tape-and-reel packaging. The full 1N3157UR-1/TR part number reflects RoHS-compliant, military-screened, and automated-assembly-ready configuration.

How does the 1N3157UR-1/TR achieve its 0.001 %/°C temperature coefficient?

The 1N3157UR-1/TR achieves 0.001 %/°C TC through proprietary metallurgical junction design and thermal compensation techniques implemented during silicon processing. This is verified by measuring only 13 mV maximum voltage change over –55°C to +100°C at 10 mA, as confirmed in Microsemi's official electrical characteristics table.

Can the 1N3157UR-1/TR replace the 1N3157A-1/TR in a design?

The 1N3157UR-1/TR and 1N3157A-1/TR share identical electrical specs including 8.4 V nominal voltage, 0.001 %/°C TC, and 13 mV ΔV_ZT, but the "A" suffix denotes Class A screening per MIL-PRF-19500/158. Substitution is acceptable for commercial applications; however, Class A qualification is required for certain defense contracts - verify screening level requirements before replacement.

What is the maximum power dissipation and recommended operating current for the 1N3157UR-1/TR?

The 1N3157UR-1/TR has a maximum DC power dissipation of 500 mW at lead temperature (T_L) = 25°C, supporting up to 55 mA peak Zener current (I_ZM). However, Microsemi specifies optimum voltage-temperature stability at 10.0 mA, where dissipated power remains below 90 mW - this is the recommended operating point for precision reference use.

1N3157UR-1/TR Specifications

Product attributes: Attribute value

Manufacturer:: Microchip Technology

Series:: -

Package/Case:: DO-213AA

Packaging:: Tape & Reel (TR)

Product Status:: Active

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

Tolerance:: ±4.76%

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:: Surface Mount

Supplier Device Package:: DO-213AA

1N3157UR-1/TR FAQ

1.How can I place an order for 1N3157UR-1/TR through Aetrix?

Please submit a Request for Quotation (RFQ) for 1N3157UR-1/TR 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 1N3157UR-1/TR reliable?

The price and inventory of 1N3157UR-1/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N3157UR-1/TR is usually 5 days.

3.What payment methods are accepted for 1N3157UR-1/TR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N3157UR-1/TR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 1N3157UR-1/TR?

1N3157UR-1/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 1N3157UR-1/TR 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 1N3157UR-1/TR?

For technical support, including 1N3157UR-1/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N3157UR-1/TR requirements.

6.How does Aetrix verify that 1N3157UR-1/TR is sourced from the original manufacturer or authorized distributors?

All 1N3157UR-1/TR 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 1N3157UR-1/TR meets industry standards.

7.What is the process for return or replacement of 1N3157UR-1/TR?

All 1N3157UR-1/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N3157UR-1/TR, 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 1N3157UR-1/TR part is unused and in its original packaging.

Return procedure for 1N3157UR-1/TR:

1.Submit a request within 90 days.

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

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