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Microchip Technology 1N4371A-1/TR
- Part No.:
- 1N4371A-1/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N4371A-1/TR.pdf
- Description:
- DIODE ZENER 2.7V 500MW DO204AH
- Quantity:
- Payment:
- Shipping:
Inventory:3,197
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Product details
Overview
1N4371A-1/TR from Microsemi is a 500 mW, 2.7 V ±5% Zener diode in DO-35 glass axial package, qualified to JANTX level per MIL-PRF-19500/127, with 30 Ω dynamic impedance at 20 mA, -0.080 %/°C temperature coefficient, and rated for -65°C to +175°C operation. It provides precision voltage regulation in military-grade power supply reference and overvoltage protection circuits.
For engineers reviewing the 1N4371A-1/TR datasheet, 1N4371A-1/TR pinout, 1N4371A-1/TR application, or 1N4371A-1/TR equivalent, key selection factors include its 2.7 V nominal Zener voltage, 30 Ω Zener impedance at IZT = 20 mA, MIL-qualified reliability, DO-35 mechanical form factor, and TR tape-and-reel packaging for automated assembly.
Technical Context
This device operates as a reverse-biased voltage reference diode with metallurgically bonded junction, delivering stable 2.7 V regulation across -65°C to +175°C ambient. Its 30 Ω dynamic impedance at 20 mA test current ensures low output variation under load transients.
The 1N4371A-1/TR exhibits a negative temperature coefficient of -0.080 %/°C at 25°C and +150°C, indicating predictable voltage drift with temperature rise. It supports 155 mA maximum Zener current (IZM) at 50°C lead temperature and derates linearly to zero at 175°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 2.7 V at IZT = 20 mA - defines primary regulation setpoint for reference design |
| Zener Impedance | 30 Ω at IZT = 20 mA - determines output voltage stability under varying load current |
| Temperature Coefficient | -0.080 %/°C - quantifies voltage drift magnitude per degree Celsius change |
| Max Zener Current | 155 mA - sets absolute upper limit for continuous DC regulation current |
| Power Dissipation | 500 mW at TL = 50°C - defines thermal boundary for safe operation with 0.375" lead length |
| Reverse Leakage | 60 µA at VR = 1.0 V - specifies minimum blocking capability before breakdown onset |
| Forward Voltage | 1.1 V at IF = 200 mA - relevant for forward-conduction fault conditions or polarity check |
Pinout & Package
Hermetically sealed axial-leaded DO-35 (DO-204AH) glass 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 (unbanded end) | Current entry terminal in forward bias; common reference node in Zener regulation | Connected to lower-potential side of regulated circuit; used for polarity verification |
| Cathode (banded end) | Current exit terminal in forward bias; Zener regulation terminal in reverse bias | Connected to higher-potential side during regulation; must be held positive relative to anode |
Key Features
| Feature | Design Value |
|---|---|
| MIL-PRF-19500/127 qualification | JANTX-level reliability certified for aerospace and defense systems requiring extended lifetime and radiation tolerance |
| Metallurgical bond construction | Enhances thermal cycling endurance and long-term parameter stability under harsh environmental stress |
| Low dynamic impedance (30 Ω) | Minimizes output voltage deviation during rapid load current changes in precision references |
| Hermetic DO-35 glass package | Provides moisture and contaminant immunity essential for high-reliability military deployments |
| Tape-and-reel (TR) packaging | Enables direct use in automated SMT placement equipment despite axial-leaded form factor |
Applications
| Power Supply Reference | Aerospace Voltage Clamp |
|---|---|
Use Scenario: Stable 2.7 V reference for analog-to-digital converter biasing in satellite telemetry subsystems. IC Role / Device Role / Timing Role: Zener diode operating in reverse breakdown to fix reference node voltage. Use Value: -0.080 %/°C TC and MIL-qualified construction ensure <±1.5% output drift over -55°C to +125°C operational range. | Use Scenario: Overvoltage protection on 3.3 V avionics bus lines exposed to lightning-induced transients. IC Role / Device Role / Timing Role: Shunt regulator clamping transient energy above 2.7 V threshold. Use Value: 155 mA IZM and 500 mW PM(AV) allow absorption of short-duration surges without degradation. |
| Test Equipment Calibration | Radiation-Hardened Sensor Interface |
Use Scenario: Precision voltage standard in portable multimeter internal reference circuitry. IC Role / Device Role / Timing Role: Primary voltage reference element defining measurement accuracy baseline. Use Value: 30 Ω ZZT ensures <0.6 mV output shift per 20 mA load step, meeting Class II calibration requirements. | Use Scenario: Bias stabilization for radiation-tolerant photodiode amplifiers in nuclear reactor monitoring. IC Role / Device Role / Timing Role: Regulation node maintaining constant op-amp input offset under neutron flux. Use Value: Inherent radiation hardness per MicroNote 050 eliminates need for shielding or derating in high-dose environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4371AUR-1 | Same electrical specs but in DO-213AA (MELF) surface-mount package; RoHS compliant only | Requires PCB redesign for SMT layout; unsuitable for through-hole or wire-wrap prototyping | Select when automated reflow assembly and space-constrained layouts are required |
| 1N4371A-1 | Identical DO-35 package and electrical specs but without TR tape-and-reel packaging | Lacks standardized feeding for pick-and-place machines; requires manual or bulk loading | Select for low-volume prototyping or repair where reel packaging adds no value |
Compared with 1N4371AUR-1 and 1N4371A-1, the 1N4371A-1/TR offers identical Zener performance and MIL qualification while adding TR packaging for production-line compatibility-no electrical trade-offs, but enables scalable manufacturing without changing circuit design.
Availability
1N4371A-1/TR is available at Aetrix Electronics and suitable for aerospace power conditioning, defense-grade instrumentation, and radiation-hardened sensor interface designs requiring stable component supply across extended product lifecycles.
Supply support for 1N4371A-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 Corporation (now part of Microchip Technology) is a U.S.-based semiconductor company specializing in high-reliability, radiation-tolerant, and military-qualified components.
The 1N4371A-1/TR belongs to Microsemi's legacy MIL-PRF-19500/127 qualified Zener diode family, designed specifically for voltage reference and overvoltage protection in mission-critical aerospace, defense, and nuclear instrumentation systems.
FAQ
What is the nominal Zener voltage and tolerance of the 1N4371A-1/TR?
The 1N4371A-1/TR has a nominal Zener voltage of 2.7 V with a ±5% tolerance, as indicated by the "A" suffix in its part number per JEDEC nomenclature. This tolerance applies at 25°C with IZT = 20 mA, and the device maintains regulation across its full -65°C to +175°C operating temperature range. The 1N4371A-1/TR is tested and binned to meet this specification under MIL-PRF-19500/127 requirements.
Is the 1N4371A-1/TR RoHS compliant?
The 1N4371A-1/TR is not RoHS compliant; it uses traditional tin-lead plating on its leads. RoHS-compliant versions are available only in the commercial-grade UR-suffixed variants (e.g., 1N4371AUR-1) and are not qualified to JAN/JANTX levels. The 1N4371A-1/TR retains tin-lead terminations to meet MIL-STD-750 solderability and reliability requirements for military applications.
What does the "TR" suffix indicate in 1N4371A-1/TR?
"TR" denotes tape-and-reel packaging per EIA-296 standard, enabling automated handling and placement in high-volume manufacturing. The 1N4371A-1/TR contains the same DO-35 glass axial device as the bulk version but is supplied wound on reels compatible with pick-and-place equipment. This packaging format does not affect electrical or thermal specifications of the 1N4371A-1/TR.
What is the maximum Zener current rating for the 1N4371A-1/TR?
The 1N4371A-1/TR has a maximum Zener current (IZM) of 155 mA at TL = 50°C with 0.375 inch lead length. This rating assumes linear derating to zero at 175°C. At ambient temperature (TA = 55°C) on a typical FR4 PCB, the usable IZM reduces to approximately 125 mA due to higher thermal resistance junction-to-ambient (300 °C/W). Exceeding IZM risks permanent parametric shift or catastrophic failure of the 1N4371A-1/TR.
How is polarity marked on the 1N4371A-1/TR?
The 1N4371A-1/TR uses a cathode band painted on the glass body to identify the cathode terminal; the banded end must be held at a higher potential than the unbanded (anode) end for proper Zener regulation. This marking complies with industry-standard diode polarity conventions and is verified per MIL-STD-750 method 2011. Reversing polarity subjects the 1N4371A-1/TR to forward conduction with VF ≈ 1.1 V at 200 mA, not regulation.
1N4371A-1/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):
- 2.7 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 30 Ohms
- Current - Reverse Leakage @ Vr:
- 75 µA @ 1 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)
1N4371A-1/TR FAQ
1.How can I place an order for 1N4371A-1/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4371A-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 1N4371A-1/TR reliable?
The price and inventory of 1N4371A-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 1N4371A-1/TR is usually 5 days.
3.What payment methods are accepted for 1N4371A-1/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4371A-1/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4371A-1/TR?
1N4371A-1/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4371A-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 1N4371A-1/TR?
For technical support, including 1N4371A-1/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4371A-1/TR requirements.
6.How does Aetrix verify that 1N4371A-1/TR is sourced from the original manufacturer or authorized distributors?
All 1N4371A-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 1N4371A-1/TR meets industry standards.
7.What is the process for return or replacement of 1N4371A-1/TR?
All 1N4371A-1/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N4371A-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 1N4371A-1/TR part is unused and in its original packaging.
Return procedure for 1N4371A-1/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4371A-1/TR Tags
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