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Microchip Technology 1N757A/TR
- Part No.:
- 1N757A/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N757A/TR.pdf
- Description:
- DIODE ZENER 9.1V 500MW DO204AH
- Quantity:
- Payment:
- Shipping:
Inventory:8,705
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Product details
Overview
1N757A/TR from Microsemi is a 500 mW, 9.1 V ±5% axial-leaded Zener diode in DO-35 (DO-204AH) glass package, qualified to JANTX 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 power supply reference circuits.
For engineers reviewing the 1N757A/TR datasheet, 1N757A/TR pinout, 1N757A/TR application, or 1N757A/TR equivalent, this page delivers verified electrical parameters, military-grade qualification status, thermal derating behavior, RoHS-compliant commercial availability, and direct alternative part comparisons for stable BOM design.
Technical Context
The 1N757A/TR operates as a reverse-biased silicon Zener regulator with nominal breakdown voltage of 9.1 V at 20 mA test current (IZT), exhibiting low dynamic impedance (6 Ω) and positive temperature coefficient (+0.068 %/°C) above 5 V, enabling stable reference generation across -65°C to +175°C ambient range.
Its hermetically sealed DO-35 glass package features internal metallurgical bonding, tin-lead or RoHS-compliant matte-tin plating, cathode band polarity marking, and is rated for 0.5 W average power dissipation at 50°C lead temperature - derating linearly to zero at 175°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 9.1 V ±5% at IZT = 20 mA - defines primary regulation setpoint for feedback references |
| Dynamic Impedance ZZT | 6 Ω at IZT = 20 mA - determines output voltage stability under load transients |
| Max Reverse Current IR | 1 µA at VR = 7.0 V - ensures low leakage in high-impedance bias networks |
| Power Dissipation PM(AV) | 0.5 W @ TL = 50°C - sets maximum continuous DC power handling on leads |
| Temp Coefficient αVZ | +0.068 %/°C @ 25°C - quantifies voltage drift over temperature in precision references |
| Junction-to-Lead RθJL | 250 °C/W - governs thermal rise from junction to lead for PCB layout heat path design |
| Operating Temp Range | -65°C to +175°C - supports operation in aerospace, downhole, and military environments |
Pinout & Package
DO-35 (DO-204AH) axial-leaded glass package with cathode indicated by colored 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 | Non-banded end | Connected to lower-potential node; forward conduction path when biased positively |
| Cathode | Banded end | Connected to higher-potential node during Zener regulation; defines breakdown polarity |
Key Features
| Feature | Design Value |
|---|---|
| MIL-PRF-19500/127 Qualification | JANTX level certified - meets screening, testing, and traceability requirements for defense/aerospace programs |
| Hermetic Glass Encapsulation | DO-35 package with internal metallurgical bond - ensures long-term reliability and moisture resistance |
| Low Capacitance & ESD Robustness | Minimal junction capacitance and non-sensitive to ESD per MIL-STD-750 method 1020 - suitable for noise-critical analog references |
| RoHS-Compliant Option | "TR" suffix denotes tape-and-reel RoHS version - enables compliance in commercial-grade production |
Applications
| Power Supply Reference | Overvoltage Protection Clamp |
|---|---|
Use Scenario: Stable 9.1 V reference in isolated DC-DC converter feedback loop. IC Role / Device Role / Timing Role: Zener diode providing precise voltage setpoint for error amplifier input. Use Value: 6 Ω dynamic impedance minimizes output voltage variation under load step changes. | Use Scenario: Clamping transient spikes on 12 V automotive sensor lines. IC Role / Device Role / Timing Role: Reverse-biased shunt device limiting voltage to 9.1 V during surge events. Use Value: 1 µA leakage at 7 V ensures minimal quiescent current draw during normal operation. |
| Temperature-Stable Bias Network | Military Grade Voltage Monitor |
Use Scenario: Generating temperature-compensated bias for op-amp input stages. IC Role / Device Role / Timing Role: Zener element in compensated reference string with matched NTC thermistor. Use Value: +0.068 %/°C tempco allows predictable compensation slope in wide-temp designs. | Use Scenario: Monitoring rail integrity in JANTX-qualified avionics subsystems. IC Role / Device Role / Timing Role: Regulator verifying 9.1 V threshold before system enable assertion. Use Value: MIL-PRF-19500/127 JANTX qualification guarantees lot traceability and burn-in screening. |
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, 10 Ω Zzt - higher power but larger footprint | Used in commercial power supplies where 1 W dissipation is required | Select when higher power margin or standard DO-41 board compatibility is needed |
| BZX55C9V1 | 9.1 V ±5%, 500 mW, DO-35, 10 Ω Zzt - same package but commercial-only, no MIL qual | Used in cost-sensitive industrial controls without military screening | Select when RoHS compliance and commercial qualification suffice, and MIL screening is unnecessary |
Compared with 1N757A/TR, 1N4739A offers higher power handling in a different package, while BZX55C9V1 provides identical voltage and package but lacks JANTX qualification - making 1N757A/TR the only option for temperature-stable, screened military reference designs.
Availability
1N757A/TR is available at Aetrix Electronics and suitable for aerospace power monitoring, avionics reference circuits, and ruggedized industrial control systems requiring stable component supply with full traceability and extended temperature support.
Supply support for 1N757A/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 Corporation (now part of Microchip Technology) designs high-reliability analog and mixed-signal semiconductors for aerospace, defense, and industrial markets.
The 1N757A/TR belongs to Microsemi's legacy MIL-qualified Zener diode family, engineered specifically for voltage reference stability, radiation tolerance, and operation across extreme temperature ranges in mission-critical systems.
FAQ
What is the Zener voltage tolerance of the 1N757A/TR?
The 1N757A/TR has a nominal Zener voltage of 9.1 V with a tolerance of ±5%, as indicated by the "A" suffix in its nomenclature per JEDEC standards. This tolerance applies at the specified test current of 20 mA and ambient temperature of 25°C. The 1N757A/TR does not offer tighter 1% or 2% tolerances - those are available only in other variants like 1N757C/TR or 1N757D/TR.
Is the 1N757A/TR RoHS compliant?
Yes, the 1N757A/TR is RoHS compliant. The "TR" suffix indicates tape-and-reel packaging, and per Microsemi documentation, RoHS-compliant versions are available for commercial-grade parts. The plating is annealed matte-tin, meeting RoHS Directive 2011/65/EU requirements, though JANTX-level screening remains applicable only to non-RoHS configurations unless explicitly ordered as RoHS-qualified JANTX.
What is the maximum power dissipation for the 1N757A/TR?
The 1N757A/TR has an average rated power dissipation of 0.5 W at a lead temperature (TL) of +50°C with 0.375 inch lead length from the body. Power derates linearly to zero at +175°C. When mounted on a PCB, it is rated for 0.4 W at +55°C ambient, derating to zero at +175°C - values confirmed in the T4-LDS-0288 datasheet Figure 2.
Does the 1N757A/TR have JANTX qualification?
Yes, the 1N757A/TR is qualified to JANTX level per MIL-PRF-19500/127. The "A" suffix denotes ±5% tolerance, and JANTX qualification includes rigorous screening including temperature cycling, steady-state life test, and lot acceptance testing. Full qualification data is documented in Microsemi's QPL listing and T4-LDS-0288 specification sheet.
What is the cathode identification method on the 1N757A/TR?
The cathode of the 1N757A/TR is identified by a visible color band on the glass DO-35 body. During Zener regulation, the banded end must be held at a higher potential than the non-banded (anode) end. This polarity marking is consistent across all 1N7xxA series devices and is verified in the Mechanical and Packaging section of the T4-LDS-0288 datasheet.
1N757A/TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-204AH, DO-35, Axial
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 9.1 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 10 Ohms
- Current - Reverse Leakage @ Vr:
- 1 µA @ 7 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.1 V @ 200 mA
- Operating Temperature:
- -65°C ~ 175°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-204AH (DO-35)
1N757A/TR FAQ
1.How can I place an order for 1N757A/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N757A/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 1N757A/TR reliable?
The price and inventory of 1N757A/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N757A/TR is usually 5 days.
3.What payment methods are accepted for 1N757A/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N757A/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N757A/TR?
1N757A/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N757A/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 1N757A/TR?
For technical support, including 1N757A/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N757A/TR requirements.
6.How does Aetrix verify that 1N757A/TR is sourced from the original manufacturer or authorized distributors?
All 1N757A/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 1N757A/TR meets industry standards.
7.What is the process for return or replacement of 1N757A/TR?
All 1N757A/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N757A/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 1N757A/TR part is unused and in its original packaging.
Return procedure for 1N757A/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N757A/TR Tags
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