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

Microchip Technology 1N757

Name: 1N757
Brand: Microchip Technology
SKU: 1N757
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 1N757

Manufacturer:: Microchip Technology

Category:: Single Zener Diodes

Package:: DO-204AH, DO-35, Axial

Datasheet:: 1N757.pdf

Description:: DIODE ZENER 9.1V 400MW DO204AH

Quantity:: RFQ Add To RFQ list

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Inventory:4,184

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Product details

Overview

1N757 from Microsemi is a 500 mW, 9.1 V ±5% silicon Zener diode in DO-35 glass axial package, qualified to JANTXV level per MIL-PRF-19500/127, with dynamic impedance of 6 Ω at 20 mA and temperature coefficient of +0.068 %/°C - used for precision voltage regulation in military power supplies and analog reference circuits.

For engineers reviewing the 1N757 datasheet, 1N757 pinout, 1N757 application, or 1N757 equivalent, this part serves as a hermetically sealed, radiation-hardened, low-capacitance voltage reference requiring no external biasing, stable across –65°C to +175°C, and validated for high-reliability analog signal conditioning and overvoltage clamping.

Technical Context

The 1N757 operates in reverse-biased breakdown mode with a nominal Zener voltage of 9.1 V at I_ZT = 20 mA, exhibiting low dynamic impedance (6 Ω) and minimal capacitance due to its glass-encapsulated DO-35 construction. Its metallurgical bond ensures thermal stability under transient load conditions.

It delivers regulated output across wide current range (IZK to IZM = 50 mA), with reverse leakage ≤1 µA at VR = 7.0 V and forward voltage ≤1.1 V at 200 mA. Temperature coefficient is positive (+0.068 %/°C), indicating increasing V_Z with junction temperature.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage V_Z	9.1 V at 20 mA test current - defines precise regulation point for reference and clamp circuits
Zener Impedance Z_ZT	6 Ω at 20 mA - ensures tight voltage stability under varying load currents
Power Dissipation	500 mW at 50°C lead temperature - supports continuous operation in compact, conduction-cooled designs
Temp Coefficient αV_Z	+0.068 %/°C - enables predictable V_Z drift compensation in temperature-critical references
Reverse Leakage I_R	≤1 µA at 7.0 V - minimizes standby power loss in high-impedance bias networks
Operating Temp Range	–65°C to +175°C - certified for aerospace, downhole, and extended-temperature industrial use
Package	DO-35 (DO-204AH) glass axial - provides hermetic seal, ESD immunity per MIL-STD-750, and RoHS-compliant plating option

Pinout & Package

DO-35 (DO-204AH) glass axial-leaded package with cathode indicated by band; leads are tin-lead or RoHS-compliant matte-tin plated, solderable per MIL-STD-750 method 2026.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward conduction terminal / Zener cathode reference ground	Connected to circuit ground or lower-potential node when used in reverse-bias regulation
Cathode (banded end)	Zener breakdown terminal / regulated output node	Supplies stable 9.1 V reference when reverse-biased; must be held positive relative to anode

Key Features

Feature	Design Value
JANTXV qualification	MIL-PRF-19500/127 certified for space-grade reliability and radiation hardness per MicroNote 050
Internal metallurgical bond	Enables robust thermal cycling performance and stable V_Z under mechanical stress
Low dynamic impedance	6 Ω at 20 mA ensures <±10 mV regulation shift across 5–50 mA load variation
Hermetic glass seal	Prevents moisture ingress and parameter drift in humid or corrosive environments
Non-ESD-sensitive	Immune to damage per MIL-STD-750 method 1020 - simplifies handling in uncontrolled assembly areas

Applications

Avionics Power Regulation	Test Equipment Reference
Use Scenario: Regulating +9 V rail in airborne navigation system power modules exposed to –55°C to +125°C ambient. IC Role / Device Role / Timing Role: Primary voltage reference for DC-DC converter feedback and analog sensor biasing. Use Value: Maintains ±0.5% output accuracy over full temperature range due to JANTXV thermal stability and low ZZT.	Use Scenario: Providing stable 9.1 V reference in portable multimeter front-end ADC calibration circuitry. IC Role / Device Role / Timing Role: Precision shunt reference for 16-bit SAR ADC offset trimming. Use Value: Enables <0.01% linearity error via low IR and predictable αV_Z compensation.
Downhole Sensor Biasing	Industrial PLC Input Protection
Use Scenario: Biasing pressure transducer bridge in oil-well logging tools operating at 175°C junction temperature. IC Role / Device Role / Timing Role: High-temp-stable Zener clamp for excitation voltage stabilization. Use Value: Survives 1000+ thermal cycles with no V_Z shift >0.1% thanks to hermetic DO-35 packaging and metallurgical bond.	Use Scenario: Overvoltage protection on 24 V digital input channel of factory automation controller. IC Role / Device Role / Timing Role: Transient voltage suppressor clamping induced surges to 9.1 V. Use Value: Limits fault energy with 1 µA leakage at 7 V and fast response from low junction capacitance.

Avionics Power Regulation

Test Equipment Reference

Use Scenario: Regulating +9 V rail in airborne navigation system power modules exposed to –55°C to +125°C ambient.

IC Role / Device Role / Timing Role: Primary voltage reference for DC-DC converter feedback and analog sensor biasing.

Use Value: Maintains ±0.5% output accuracy over full temperature range due to JANTXV thermal stability and low ZZT.

Use Scenario: Providing stable 9.1 V reference in portable multimeter front-end ADC calibration circuitry.

IC Role / Device Role / Timing Role: Precision shunt reference for 16-bit SAR ADC offset trimming.

Use Value: Enables <0.01% linearity error via low IR and predictable αV_Z compensation.

Downhole Sensor Biasing

Industrial PLC Input Protection

Use Scenario: Biasing pressure transducer bridge in oil-well logging tools operating at 175°C junction temperature.

IC Role / Device Role / Timing Role: High-temp-stable Zener clamp for excitation voltage stabilization.

Use Value: Survives 1000+ thermal cycles with no V_Z shift >0.1% thanks to hermetic DO-35 packaging and metallurgical bond.

Use Scenario: Overvoltage protection on 24 V digital input channel of factory automation controller.

IC Role / Device Role / Timing Role: Transient voltage suppressor clamping induced surges to 9.1 V.

Use Value: Limits fault energy with 1 µA leakage at 7 V and fast response from low junction capacitance.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
1N4739A	9.1 V ±5%, 1 W rating, DO-41 package, higher R_θJA (500 °C/W), no military qualification	Commercial industrial power supplies only; not suitable for aerospace or extended-temp environments	Select when cost and board space outweigh reliability and temperature requirements
BZX55C9V1	9.1 V ±5%, 500 mW, DO-35, commercial grade only, no MIL-PRF-19500 qualification	Limited to non-military, non-radiation-hardened applications; lacks JANTXV traceability	Choose for RoHS-compliant consumer electronics where radiation tolerance is irrelevant

Compared with 1N757, the 1N4739A offers higher power but lacks hermetic sealing and military qualification, while BZX55C9V1 matches package and power but omits radiation hardness and extended-temperature validation - making 1N757 uniquely suited for mission-critical analog references.

Availability

1N757 is available at Aetrix Electronics and suitable for avionics power regulation, downhole sensor biasing, industrial PLC input protection, and test equipment reference applications requiring stable component supply across long product lifecycles.

Supply support for 1N757 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 Corporation (now part of Microchip Technology) is a U.S.-based semiconductor company specializing in high-reliability, radiation-hardened, and aerospace-grade analog and mixed-signal components.

The 1N757 belongs to Microsemi's legacy MIL-PRF-19500/127-qualified Zener series designed specifically for voltage regulation in defense, space, and extreme-environment systems where parameter stability and long-term reliability are mandatory.

FAQ

What is the Zener voltage tolerance for the 1N757?

The 1N757 has a nominal Zener voltage of 9.1 V with a ±5% tolerance, as indicated by the "A" suffix in its nomenclature per JEDEC standard. This means the actual V_Z falls between 8.65 V and 9.55 V at I_ZT = 20 mA and T_A = 25°C. The 1N757 is not offered in tighter tolerances like ±2% or ±1% - those apply only to other members of the 1N7xxA family such as 1N757C-1 or 1N757D-1, which are distinct orderable parts.

Is the 1N757 RoHS compliant?

The 1N757 is available in both RoHS-compliant and non-RoHS versions. RoHS compliance is indicated by the "e3" suffix (e.g., 1N757A-1e3) and applies only to commercial-grade units - JANTXV-qualified 1N757 devices are not RoHS compliant per MIL-PRF-19500/127 requirements. Lead plating is annealed matte-tin for RoHS parts and tin-lead for non-RoHS variants, both solderable per MIL-STD-750 method 2026.

What is the maximum Zener current (I_ZM) for the 1N757?

The maximum Zener current I_ZM for the 1N757 is 50 mA, derived from its 500 mW power rating and 9.1 V nominal Zener voltage (P = V × I → I = 0.5 W / 9.1 V ≈ 55 mA, rounded conservatively to 50 mA per datasheet Table on Page 3). This value assumes operation at T_L = 50°C with 0.375 inch lead length; derating applies above that temperature per Figure 1.

Does the 1N757 have a specified forward voltage?

Yes, the 1N757 has a maximum forward voltage V_F of 1.1 V at I_F = 200 mA, as stated in the Maximum Ratings table on Page 1 of the datasheet. This specification confirms usability in dual-role applications - e.g., as a forward-biased clamp or protection diode - though its primary function remains reverse-bias Zener regulation. Forward conduction is not characterized beyond this single point.

Can the 1N757 be used in surface-mount designs?

No, the standard 1N757 is supplied in the axial-leaded DO-35 (DO-204AH) glass package and is not a surface-mount device. However, Microsemi offers MELF-style equivalents - the 1N757AUR-1 - in DO-213AA package for SMT applications. These share identical electrical specs but differ mechanically; the 1N757AUR-1 is a separate orderable part, not a drop-in replacement for through-hole 1N757 assemblies.

1N757 Specifications

Product attributes: Attribute value

Manufacturer:: Microchip Technology

Series:: -

Package/Case:: DO-204AH, DO-35, Axial

Packaging:: Bulk

Product Status:: Active

Voltage - Zener (Nom) (Vz):: 9.1 V

Tolerance:: ±5%

Power - Max:: 400 mW

Impedance (Max) (Zzt):: 10 Ohms

Current - Reverse Leakage @ Vr:: 100 nA @ 1 V

Voltage - Forward (Vf) (Max) @ If:: 1.1 V @ 200 mA

Operating Temperature:: -65°C ~ 175°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: DO-204AH (DO-35)

1N757 FAQ

1.How can I place an order for 1N757 through Aetrix?

Please submit a Request for Quotation (RFQ) for 1N757 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 1N757 reliable?

The price and inventory of 1N757 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N757 is usually 5 days.

3.What payment methods are accepted for 1N757?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N757 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 1N757?

1N757 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 1N757 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 1N757?

For technical support, including 1N757 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N757 requirements.

6.How does Aetrix verify that 1N757 is sourced from the original manufacturer or authorized distributors?

All 1N757 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 1N757 meets industry standards.

7.What is the process for return or replacement of 1N757?

All 1N757 units undergo pre-shipment inspection (PSI). If there is an issue with 1N757, 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 1N757 part is unused and in its original packaging.

Return procedure for 1N757:

1.Submit a request within 90 days.

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

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