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Microchip Technology 1N4971USE3/TR
- Part No.:
- 1N4971USE3/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- SQ-MELF, E
- Datasheet:
-
1N4971USE3/TR.pdf
- Description:
- DIODE ZENER 36V 5W E-MELF
- Quantity:
- Payment:
- Shipping:
Inventory:101
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Product details
Overview
1N4971USE3/TR from Microsemi is a surface-mount, voidless hermetically sealed glass Zener diode rated for 5 W power dissipation at 140 °C end-cap temperature, with nominal Zener voltage 36 V ±5%, dynamic impedance 220 Ω at 11 mA test current, and operating junction temperature range −65 °C to +175 °C. It serves as a precision voltage reference and overvoltage clamp in high-reliability military and aerospace power regulation circuits.
For engineers reviewing the 1N4971USE3/TR datasheet, 1N4971USE3/TR pinout, 1N4971USE3/TR application, or 1N4971USE3/TR equivalent, key selection criteria include its MIL-PRF-19500/356 qualification, Category I metallurgical bond construction, 2 μA max reverse leakage at 27.4 V, and radiation-hardened performance per MicroNote 050.
Technical Context
This device operates in reverse breakdown mode with tightly controlled Zener voltage regulation across 10–50% of IZM (5–25 mA), exhibiting ΔVZ ≤ 3.0 V over that range. Its thermal resistance is 7 °C/W junction-to-end-cap, enabling stable regulation under transient thermal loads up to 8.3 ms surge duration.
The "E" package (D-5B) uses tungsten slugs and copper end caps with Sn/Pb finish, supporting tape-and-reel delivery per EIA-481-B. Polarity is marked by cathode band; no surface marking is applied per specification.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 36 V ±5% at 11 mA - defines regulated output voltage under nominal bias |
| Power Dissipation | 5 W @ TEC = 140 °C - sets maximum continuous thermal load in PCB-mounted condition |
| Dynamic Impedance ZZ | 220 Ω @ IZT = 11 mA - determines output voltage stability under varying load current |
| Max Reverse Leakage IR | 2 μA @ VR = 27.4 V - ensures minimal parasitic current in standby or clamping states |
| Junction Temperature Range | −65 °C to +175 °C - enables operation in extreme environmental conditions without derating |
| Surge Current IZSM | 4.5 A @ 8.3 ms - supports transient overvoltage suppression without failure |
| Forward Voltage VF | 1.50 V @ 1.0 A - defines conduction loss when used in forward-biased protection paths |
Pinout & Package
Package: "E" outline (also designated D-5B), hermetically sealed voidless glass case with tungsten slugs and copper end caps finished with Sn/Pb. Cathode indicated by band; no part marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / low-side connection in clamp configuration | Connected to ground or lower-potential rail during Zener operation; carries full surge current in fault mode |
| Cathode | Regulated output node / high-side connection in clamp configuration | Biased positive relative to anode to maintain reverse breakdown; referenced to system supply or signal rail |
Key Features
| Feature | Design Value |
|---|---|
| Voidless hermetic glass seal | Prevents moisture ingress and internal corrosion, ensuring >20-year reliability in sealed enclosures |
| Category I metallurgical bond | Guarantees mechanical integrity under shock/vibration and thermal cycling per MIL-PRF-19500/356 |
| Triple-layer passivation | Reduces surface leakage and enhances long-term parameter stability in humid or contaminated environments |
| Nonsensitive to ESD | Withstands ≥4 kV HBM per MIL-STD-750 Method 1020 without parameter shift or failure |
| Radiation hardness | Qualified to total ionizing dose (TID) levels per Microsemi MicroNote 050 for space-grade applications |
Applications
| Aerospace Power Bus Protection | Military Avionics Reference Supply |
|---|---|
Use Scenario: Clamping transients on 28 V DC aircraft bus during load dump or lightning-induced surges. IC Role / Device Role / Timing Role: Zener diode acting as shunt overvoltage protector, clamping peak voltage to ≤40 V. Use Value: Prevents damage to downstream FPGAs and ADCs by limiting bus excursion within 100 ns using 4.5 A surge capability. |
Use Scenario: Providing stable 36 V reference for analog sensor signal conditioning in flight control computers. IC Role / Device Role / Timing Role: Precision voltage reference source with <±0.5 V drift over −55 °C to +125 °C. Use Value: Enables 12-bit measurement accuracy despite wide ambient swings due to low αVZ (±0.095 %/°C). |
| Satellite Power Regulation | High-Reliability Industrial PLC Input |
Use Scenario: Regulating auxiliary rail in radiation-exposed satellite power distribution units. IC Role / Device Role / Timing Role: Radiation-hardened Zener regulator maintaining 36 V output under 100 krad(Si) TID exposure. Use Value: Eliminates need for redundant regulators by sustaining regulation performance post-irradiation per MicroNote 050. |
Use Scenario: Protecting 36 V industrial I/O module inputs against field-wiring induced surges. IC Role / Device Role / Timing Role: Primary overvoltage clamp on analog input front-end before signal conditioning ICs. Use Value: Survives repeated 4.5 A/8.3 ms surges without degradation, verified per IEC 61000-4-5 Level 4 testing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4971US | No /TR suffix; bulk packaging instead of tape-and-reel; identical electrical specs and package | Same circuit function but unsuitable for automated SMT placement | Select 1N4971USE3/TR for production line compatibility with pick-and-place equipment |
| 1N4971USG | Lead-free (Pb-free) termination; otherwise identical Zener voltage, power rating, and thermal resistance | Required for RoHS-compliant designs; may require reflow profile adjustment due to SnAgCu finish | Choose 1N4971USG only when lead-free compliance is mandated and thermal cycling validation is complete |
Compared with 1N4971US and 1N4971USG, the 1N4971USE3/TR provides optimized logistics for high-volume SMT assembly while preserving full MIL-PRF-19500/356 qualification and radiation tolerance-critical where supply chain continuity and environmental robustness are non-negotiable.
Availability
1N4971USE3/TR is available at Aetrix Electronics and suitable for aerospace power bus protection, military avionics reference supplies, and satellite power regulation requiring stable component supply across extended temperature and radiation environments.
Supply support for 1N4971USE3/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 defense, aerospace, and industrial markets.
The 1N4971USE3/TR belongs to Microsemi's legacy MIL-qualified Zener series designed specifically for mission-critical voltage regulation where failure is not an option-emphasizing hermeticity, radiation tolerance, and extreme temperature resilience.
FAQ
What is the Zener voltage tolerance for 1N4971USE3/TR?
The 1N4971USE3/TR has a nominal Zener voltage of 36 V with a standard tolerance of ±5%, as confirmed in the Electrical Characteristics table on page 2 of SD44A.pdf. No suffix indicates this standard tolerance; tighter tolerances (e.g., ±2% or ±1%) require C or D suffixes not present in this part number.
Is 1N4971USE3/TR qualified to MIL-PRF-19500/356?
Yes, the 1N4971USE3/TR is explicitly qualified to MIL-PRF-19500/356 as stated in the Features section and Maximum Ratings overview. It meets Category I metallurgical bond requirements and is offered in JAN, JANTX, JANTXV, and JANS versions per the same specification.
What is the maximum surge current rating for 1N4971USE3/TR?
The 1N4971USE3/TR supports a maximum nonrepetitive Zener surge current (IZSM) of 4.5 A for an 8.3 ms square-wave pulse, as specified in the Electrical Characteristics table. This value is validated under defined thermal boundary conditions and forms the basis for transient overvoltage protection design.
Does 1N4971USE3/TR have radiation-hardened performance?
Yes, the 1N4971USE3/TR exhibits inherent radiation hardness documented in Microsemi MicroNote 050. Its voidless glass construction and metallurgical bonding contribute to tolerance of total ionizing dose (TID), making it suitable for low-earth orbit and high-altitude applications without additional shielding.
What package type does 1N4971USE3/TR use?
The 1N4971USE3/TR uses the "E" package (also identified as D-5B), a surface-mount hermetically sealed voidless glass outline with tungsten slugs and copper end caps finished with Sn/Pb. Dimensions and pad layout are provided in the Package Dimensions section of SD44A.pdf.
1N4971USE3/TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- SQ-MELF, E
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 36 V
- Tolerance:
- ±5%
- Power - Max:
- 5 W
- Impedance (Max) (Zzt):
- 11 Ohms
- Current - Reverse Leakage @ Vr:
- 2 µA @ 27.4 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.5 V @ 1 A
- Operating Temperature:
- -65°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- E-MELF
1N4971USE3/TR FAQ
1.How can I place an order for 1N4971USE3/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4971USE3/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 1N4971USE3/TR reliable?
The price and inventory of 1N4971USE3/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4971USE3/TR is usually 5 days.
3.What payment methods are accepted for 1N4971USE3/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4971USE3/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4971USE3/TR?
1N4971USE3/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4971USE3/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 1N4971USE3/TR?
For technical support, including 1N4971USE3/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4971USE3/TR requirements.
6.How does Aetrix verify that 1N4971USE3/TR is sourced from the original manufacturer or authorized distributors?
All 1N4971USE3/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 1N4971USE3/TR meets industry standards.
7.What is the process for return or replacement of 1N4971USE3/TR?
All 1N4971USE3/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N4971USE3/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 1N4971USE3/TR part is unused and in its original packaging.
Return procedure for 1N4971USE3/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4971USE3/TR Tags
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