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Microchip Technology 1N4961US/TR
- Part No.:
- 1N4961US/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- SQ-MELF, E
- Datasheet:
-
1N4961US/TR.pdf
- Description:
- DIODE ZENER 13V 5W E-MELF
- Quantity:
- Payment:
- Shipping:
Inventory:115
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Product details
Overview
1N4961US/TR from Microsemi is a surface-mount, hermetically sealed, voidless-glass 5 W Zener diode with nominal Zener voltage of 13 V, ±5% tolerance, 3.0 Ω dynamic impedance at 100 mA test current, and maximum continuous Zener current of 365 mA. It operates from –65 °C to +175 °C and is used in high-reliability voltage regulation for aerospace power conditioning circuits.
For engineers reviewing the 1N4961US/TR datasheet, 1N4961US/TR pinout, 1N4961US/TR application, or 1N4961US/TR equivalent, this part delivers military-grade thermal stability, radiation-hardened construction, and low-impedance regulation across wide current and temperature ranges - critical for mission-critical analog reference and overvoltage clamp designs.
Technical Context
This Zener diode employs a Category I internal metallurgical bond and triple-layer passivation for enhanced reliability under thermal cycling and radiation exposure. Its voidless-glass hermetic seal eliminates moisture ingress and interfacial delamination risks common in plastic-packaged Zeners.
The device exhibits a temperature coefficient of ±0.08 %/°C at 100 mA, enabling stable regulation over –65 °C to +175 °C junction range. Its 1.5 V forward voltage at 1.0 A supports robust reverse/forward polarity verification during board-level testing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 13 V nominal at 100 mA - precise reference point for regulated supply rails in avionics power modules |
| Power Dissipation | 5 W @ TEC = 140 °C - enables compact thermal design without external heatsinking in conduction-cooled enclosures |
| Dynamic Impedance (ZZ) | 3.0 Ω at IZT = 100 mA - ensures minimal output voltage variation under load transients in feedback loops |
| Max Reverse Leakage (IR) | 10 μA at VR = 9.9 V - guarantees low standby power loss in always-on monitoring circuits |
| Temp Coefficient (αVZ) | ±0.08 %/°C - supports <±10 mV drift over full military temperature range for precision references |
| Surge Current (IZSM) | 16 A @ 8.3 ms - withstands lightning-induced transients per DO-160 Section 22 Level 3 |
| Forward Voltage (VF) | 1.50 V @ 1.0 A - allows unambiguous forward-bias continuity check during automated optical inspection |
Pinout & Package
Package: "E" package (also known as "D-5B"), hermetically sealed voidless glass case with tungsten slugs and copper end caps finished with Sn/Pb. Cathode indicated by band. Weight: 539 mg. Tape & reel compliant with EIA-481-B.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias; connected to ground or low-side reference in shunt regulator | Accepts up to 1.0 A forward current; used for polarity verification and functional test access |
| Cathode | Regulated output node in reverse breakdown; connected to input rail in shunt configuration | Delivers stable 13 V reference; marked by visible band; interfaces directly with feedback networks |
Key Features
| Feature | Design Value |
|---|---|
| Voidless hermetic glass seal | Eliminates moisture-induced parameter shift and long-term degradation in humid or vacuum environments |
| Category I metallurgical bond | Ensures mechanical integrity under shock/vibration profiles exceeding MIL-STD-883 Method 2002 |
| Triple-layer passivation | Prevents surface leakage paths and ion migration in high-humidity or contaminated atmospheres |
| Nonsensitive to ESD | Withstands >4 kV HBM per MIL-STD-750 Method 1020 - no handling precautions required on production floor |
| Radiation hardness | Qualified per MicroNote 050 - suitable for low-earth orbit applications without derating |
Applications
| Aerospace Power Conditioning | Avionics Reference Supply |
|---|---|
Use Scenario: Regulating auxiliary 13 V rail in flight control computer power distribution unit exposed to –55 °C to +70 °C ambient. IC Role / Device Role / Timing Role: Shunt voltage regulator providing stable bias to op-amps and ADC references. Use Value: Maintains <±15 mV output deviation across full temperature and 10–300 mA load range due to low ZZ and tight αVZ. |
Use Scenario: Generating precision 13 V reference for analog sensor signal conditioning in inertial measurement units. IC Role / Device Role / Timing Role: Primary voltage reference source for ratiometric bridge excitation and offset calibration. Use Value: Delivers <10 ppm/°C drift and <5 μA leakage at 9.9 V, minimizing sensor zero-error drift over mission duration. |
| Military Vehicle ECUs | Satellite Payload Biasing |
Use Scenario: Clamping transient overvoltages on 12 V vehicle bus during load dump events per ISO 7637-2 Pulse 5a. IC Role / Device Role / Timing Role: Transient voltage suppressor protecting CAN transceivers and microcontroller I/O. Use Value: Absorbs 16 A surge at 8.3 ms without failure, verified per MIL-STD-1275B Annex A. |
Use Scenario: Providing stable bias to RF front-end LNAs in LEO satellite communication payloads operating at 175 °C junction. IC Role / Device Role / Timing Role: High-temperature Zener reference enabling gain stabilization in GaAs amplifier stages. Use Value: Operates continuously at +175 °C with <0.5% VZ shift - validated per MIL-PRF-19500/356 screening. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4961US | No tape-and-reel packaging; bulk or ammo pack only | Same electrical specs but unsuitable for automated SMT placement | Select 1N4961US/TR when using pick-and-place equipment; choose 1N4961US for manual prototyping or repair |
| 1N4960US/TR | 12 V nominal Zener voltage, 2.5 Ω ZZ, 395 mA IZM | Lower voltage grade for 12 V system rails; slightly lower power margin | Use 1N4960US/TR where 12 V regulation is required and tighter ZZ improves loop stability |
Compared with 1N4961US/TR, the 1N4961US lacks tape-and-reel compatibility for high-volume assembly, while 1N4960US/TR offers lower voltage and improved dynamic impedance but reduced headroom for 13 V nominal systems.
Availability
1N4961US/TR is available at Aetrix Electronics and suitable for aerospace power conditioning, avionics reference supply, and military vehicle ECU designs requiring stable component supply under extended temperature and radiation constraints.
Supply support for 1N4961US/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 manufacturer specializing in high-reliability, radiation-hardened, and defense-grade components.
The 1N49xxUS series belongs to Microsemi's military-qualified Zener regulator product line, designed specifically for high-integrity voltage reference and transient suppression in aerospace, defense, and spaceflight systems.
FAQ
What is the Zener voltage tolerance for 1N4961US/TR?
The 1N4961US/TR has a standard ±5% Zener voltage tolerance at 100 mA test current, yielding a guaranteed 12.35–13.65 V range. 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 1N4961US/TR compatible with lead-free reflow processes?
The 1N4961US/TR features Sn/Pb finish on copper end caps and is rated for operation up to +175 °C junction temperature, but its termination is not lead-free. It is not qualified for Pb-free reflow profiles; use only with SnPb solder paste and peak temperatures ≤220 °C.
Does 1N4961US/TR meet MIL-PRF-19500/356 requirements?
Yes, the 1N4961US/TR is qualified to MIL-PRF-19500/356 as a JAN, JANTX, JANTXV, or JANS device depending on screening level. Full qualification includes burn-in, temperature cycling, and hermeticity testing per the specification.
What is the thermal resistance of 1N4961US/TR?
The 1N4961US/TR has a junction-to-end-cap thermal resistance of 7 °C/W, measured at TEC = 140 °C. This value enables direct thermal coupling to metal-core PCBs or chassis mounts without additional thermal interface materials.
Can 1N4961US/TR be used in forward conduction mode?
Yes, the 1N4961US/TR specifies a maximum forward voltage of 1.50 V at 1.0 A, making it suitable for polarity verification, continuity testing, and low-duty-cycle forward-bias applications - though its primary function remains reverse-bias Zener regulation.
1N4961US/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):
- 13 V
- Tolerance:
- ±5%
- Power - Max:
- 5 W
- Impedance (Max) (Zzt):
- 3 Ohms
- Current - Reverse Leakage @ Vr:
- 10 µA @ 9.9 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
1N4961US/TR FAQ
1.How can I place an order for 1N4961US/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4961US/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 1N4961US/TR reliable?
The price and inventory of 1N4961US/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4961US/TR is usually 5 days.
3.What payment methods are accepted for 1N4961US/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4961US/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4961US/TR?
1N4961US/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4961US/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 1N4961US/TR?
For technical support, including 1N4961US/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4961US/TR requirements.
6.How does Aetrix verify that 1N4961US/TR is sourced from the original manufacturer or authorized distributors?
All 1N4961US/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 1N4961US/TR meets industry standards.
7.What is the process for return or replacement of 1N4961US/TR?
All 1N4961US/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N4961US/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 1N4961US/TR part is unused and in its original packaging.
Return procedure for 1N4961US/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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