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Microchip Technology 1N457A/TR
- Part No.:
- 1N457A/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N457A/TR.pdf
- Description:
- DIODE GP REV 70V 150MA DO35
- Quantity:
- Payment:
- Shipping:
Inventory:9,342
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Product details
Overview
1N457A/TR from Microsemi is a 6.4 V temperature-compensated Zener reference diode in DO-7 (DO-204AA) glass axial-leaded package, rated for 1.0 mA Zener test current, 0.005 %/°C temperature coefficient, and 100 Ω dynamic impedance at IZT. It delivers stable voltage reference performance across -55 °C to +100 °C operating range and is used in precision instrumentation calibration circuits.
For engineers reviewing the 1N457A/TR datasheet, 1N457A/TR pinout, 1N457A/TR application, or 1N457A/TR equivalent, key selection criteria include its low TC (0.005 %/°C), tight 6.4 V ±5% nominal tolerance, DO-7 hermetic glass package, military qualification readiness (JANTX/JANTXV with -1 suffix), and 1.0 mA optimal bias point for minimal thermal drift.
Technical Context
This device belongs to Microsemi's zero-temperature-coefficient Zener family optimized for high-stability voltage references. Its 6.4 V nominal Zener voltage leverages silicon bandgap and Zener breakdown interaction to achieve ultra-low TC down to 0.0005 %/°C - 1N457A/TR operates at 1.0 mA IZT and exhibits 100 Ω dynamic impedance.
The DO-7 package features internal metallurgical bonding, tin-lead plated leads compliant with MIL-STD-750 Method 2026, and cathode band marking. It supports operation from -65 °C to +175 °C storage and operating temperatures, with 500 mW max power dissipation at 25 °C lead temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 6.4 V ±5% at 1.0 mA - defines nominal reference level with calibrated tolerance for system-level accuracy budgeting |
| Temperature Coefficient (αVZ) | 0.005 %/°C - enables <0.5 mV drift over 0–75 °C ambient, critical for lab-grade instrumentation |
| Zener Test Current (IZT) | 1.0 mA - optimal bias point where TC and impedance are specified; deviation increases drift and noise |
| Dynamic Impedance (ZZT) | 100 Ω at IZT - determines load regulation error under varying current draw in reference divider networks |
| Max Reverse Current (IR) | 2.0 µA @ 3 V - ensures negligible leakage error when used in high-impedance sensing or comparator reference paths |
| Operating Temp Range | -55 °C to +100 °C - validated stability range for aerospace and industrial control environments |
| Package | DO-7 (DO-204AA) - hermetically sealed glass axial package with MIL-STD-750 solderability and ESD immunity |
Pinout & Package
DO-7 (DO-204AA) package: hermetically sealed glass case with axial leads, cathode band marking, tin-lead plated terminals per MIL-STD-750 Method 2026. Polarity: banded end is cathode; device operated with cathode positive relative to anode for Zener conduction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unbanded end) | Reference ground node | Connected to circuit common; reverse-biased configuration requires this terminal at lower potential than cathode |
| Cathode (banded end) | Reference output node | Provides stable 6.4 V relative to anode; must be biased positively via series resistor or current source |
Key Features
| Feature | Design Value |
|---|---|
| Temperature coefficient of 0.005 %/°C | Reduces voltage drift to ≤0.48 mV over 0–75 °C, enabling sub-0.1% total error in 12-bit DAC reference designs |
| Hermetic DO-7 glass package | Ensures long-term parameter stability and moisture resistance in harsh environments without conformal coating |
| MIL-PRF-19500/452 qualification readiness | Supports rapid upgrade to JANTX1N457A-1 or JANTXV1N457A-1 for defense/aerospace programs with no redesign |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Eliminates need for on-board ESD protection circuitry in handling-sensitive test equipment and avionics interfaces |
| Tape-and-reel option (TR suffix) | Enables automated SMT-compatible placement despite axial form factor via carrier tape indexing |
Applications
| High-Precision Calibration Standards | Laboratory Multimeter Reference |
|---|---|
|
Use Scenario: Used as primary voltage reference in portable calibration standards traceable to NIST. IC Role / Device Role / Timing Role: Zener reference diode providing 6.4 V baseline for ADC/DAC linearity verification. Use Value: 0.005 %/°C TC ensures <±0.05% drift over field operating temperature, meeting ANSI C12.20 Class 0.1 accuracy requirements. |
Use Scenario: Embedded in handheld digital multimeters for DC voltage measurement reference. IC Role / Device Role / Timing Role: Stable 6.4 V reference for autoranging analog front-end scaling and offset correction. Use Value: 100 Ω ZZT minimizes loading error during auto-ranging switch transitions, preserving 4½-digit resolution. |
| Aerospace Power Monitor Circuits | Industrial PLC Analog Input Modules |
|
Use Scenario: Biasing reference for radiation-tolerant voltage monitors in satellite power distribution units. IC Role / Device Role / Timing Role: Temperature-stable Zener element in fault-detection comparators monitoring bus voltage thresholds. Use Value: DO-7 hermetic seal and -65 °C to +175 °C rating support operation in vacuum and thermal cycling without parameter shift. |
Use Scenario: Reference source for 4–20 mA transmitter conditioning circuits in factory automation systems. IC Role / Device Role / Timing Role: Precision voltage node for op-amp-based current loop drivers and sensor signal conditioning. Use Value: 2.0 µA IR at 3 V prevents leakage-induced offset in high-impedance feedback networks driving 16-bit SAR ADCs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener reference diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4571A | Same 6.4 V nominal, same 0.005 %/°C TC, but rated for 0.5 mA IZT and 200 Ω ZZT | Lower bias current suits ultra-low-power battery-operated sensors; higher impedance limits use in fast-settling references | Select 1N4571A only when supply current <0.7 mA is mandatory and settling time >100 µs is acceptable |
| 1N4574A | Same 6.4 V nominal, identical 1.0 mA IZT, but tighter 0.0005 %/°C TC and 100 Ω ZZT | Superior TC enables metrology-grade instruments; identical bias and impedance allow drop-in replacement where drift <0.1 mV is required | Choose 1N4574A when system-level TC budget demands <0.15 mV total drift over full temperature range |
Compared with 1N457A/TR, 1N4571A trades lower operating current for higher dynamic impedance, while 1N4574A improves TC by one order of magnitude at identical bias - both retain DO-7 packaging and MIL-qualification path, making them direct functional alternatives within defined current and drift constraints.
Availability
1N457A/TR is available at Aetrix Electronics and suitable for high-reliability instrumentation calibration, aerospace power monitoring, and industrial PLC analog input modules requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for 1N457A/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 and mixed-signal components for aerospace, defense, and industrial markets.
The 1N4565–1N4584A series was designed specifically for precision voltage reference applications demanding ultra-low temperature coefficients and hermetic reliability in mission-critical systems.
FAQ
What is the Zener voltage tolerance for 1N457A/TR?
The 1N457A/TR has a nominal Zener voltage of 6.4 V with a tolerance of ±5% at 1.0 mA test current and 25 °C. Tighter tolerances (e.g., ±1%, ±2%) are available via custom ordering with suffixes like "-1%" or "-2%", but the standard 1N457A/TR remains ±5%. This tolerance directly impacts absolute accuracy in calibration-grade circuits and must be included in total error budgets.
Does 1N457A/TR require external current limiting?
Yes, the 1N457A/TR must be operated with a series current-limiting resistor to maintain its 1.0 mA Zener test current (IZT). Without proper biasing, voltage regulation degrades due to TC shift and increased dynamic impedance. Typical designs use a resistor calculated from supply voltage minus 6.4 V, divided by 1.0 mA - e.g., 12 V supply → 5.6 kΩ resistor.
Is 1N457A/TR qualified for military applications?
The base 1N457A/TR is not pre-qualified, but it is fully compatible with MIL-PRF-19500/452. Adding the JANTX or JANTXV prefix and "-1" suffix (e.g., JANTX1N457A-1) yields a tested, certified version meeting screening and environmental requirements for defense programs. The DO-7 package and internal construction inherently support this qualification path.
What is the maximum power dissipation for 1N457A/TR?
The 1N457A/TR has a maximum DC power dissipation of 500 mW at 25 °C lead temperature (TL). However, for optimal voltage-temperature stability, operation should remain below 30 mW - achieved by limiting IZ to ~1.0 mA at 6.4 V. Exceeding this derated power causes thermal runaway risk and TC degradation, especially in enclosed assemblies.
Can 1N457A/TR be used in surface-mount designs?
No, the 1N457A/TR uses a DO-7 axial-leaded glass package incompatible with standard SMT reflow. Microsemi offers surface-mount equivalents such as JANTX1N4569AUR-1 in DO-213AA for SMT compatibility, but 1N457A/TR itself requires through-hole or socketed mounting. The TR suffix denotes tape-and-reel packaging for automated axial insertion, not SMT suitability.
1N457A/TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-204AH, DO-35, Axial
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Standard, Reverse Polarity
- Voltage - DC Reverse (Vr) (Max):
- 70 V
- Current - Average Rectified (Io):
- 150mA
- Voltage - Forward (Vf) (Max) @ If:
- 1 V @ 100 mA
- Speed:
- Small Signal =< 200mA (Io), Any Speed
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 1 µA @ 70 V
- Capacitance @ Vr, F:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-204AH (DO-35)
- Operating Temperature - Junction:
- -65°C ~ 150°C
1N457A/TR FAQ
1.How can I place an order for 1N457A/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N457A/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 1N457A/TR reliable?
The price and inventory of 1N457A/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N457A/TR is usually 5 days.
3.What payment methods are accepted for 1N457A/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N457A/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N457A/TR?
1N457A/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N457A/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 1N457A/TR?
For technical support, including 1N457A/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N457A/TR requirements.
6.How does Aetrix verify that 1N457A/TR is sourced from the original manufacturer or authorized distributors?
All 1N457A/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 1N457A/TR meets industry standards.
7.What is the process for return or replacement of 1N457A/TR?
All 1N457A/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N457A/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 1N457A/TR part is unused and in its original packaging.
Return procedure for 1N457A/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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