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Microchip Technology 1N3891
- Part No.:
- 1N3891
- Manufacturer:
- Microchip Technology
- Category:
- Single Diodes
- Package:
- DO-203AA, DO-4, Stud
- Datasheet:
-
1N3891.pdf
- Description:
- DIODE GEN PURP 200V 12A DO203AA
- Quantity:
- Payment:
- Shipping:
Inventory:3,602
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Product details
Overview
1N3891 from Microsemi is a hermetically sealed, fast-recovery rectifier diode in DO-203AA (DO-4) metal-glass package with cathode-to-stud polarity, rated for 200 V repetitive peak reverse voltage (VRRM), 12 A average forward current (IO) at TC = 100 °C, and 200 ns reverse recovery time (trr) at TC = 55 °C - used in military-grade DC power supplies and ultrasonic systems.
For engineers reviewing the 1N3891 datasheet, 1N3891 pinout, 1N3891 application, or 1N3891 equivalent, key selection criteria include its JANTXV qualification per MIL-PRF-19500/304, low thermal resistance (RθJC = 2.0 °C/W), 10–15 inch-pound stud torque limit, and availability in both standard and reverse polarity configurations.
Technical Context
The 1N3891 operates as a unidirectional power rectifier with fast recovery characteristics optimized for high-frequency switching in harsh-environment applications. Its metal-glass DO-203AA package enables hermetic sealing, while the threaded stud terminal supports direct heatsinking and mechanical mounting in aerospace and defense systems.
It exhibits 1.5 V maximum forward voltage at IFM = 38 A and TC = 25 °C, 10 µA maximum reverse leakage at VRM = 200 V and TC = 25 °C, and a junction temperature range of –65 °C to +175 °C - enabling reliable operation under transient thermal stress and wide ambient conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 200 V - maximum repetitive reverse voltage the device blocks reliably in continuous operation |
| IO (TC = 100 °C) | 12 A - average forward current sustainable with case temperature held at 100 °C |
| trr | 200 ns - reverse recovery time measured at IF = 1 A, VR = 30 V, di/dt = 25 A/µs, TC = 55 °C |
| VFM (IFM = 38 A) | 1.5 V - forward voltage drop at 38 A pulsed current, defining conduction loss in high-current transients |
| RθJC | 2.0 °C/W - thermal resistance from junction to case, critical for heatsink sizing in stud-mounted layouts |
| TJ & TSTG | –65 °C to +175 °C - operational and storage temperature envelope supporting extended military environments |
Pinout & Package
Package: DO-203AA (DO-4) - hermetically sealed metal-glass case with 10-32 UNF3A threaded stud terminal, tin-lead or RoHS-compliant matte-tin plating, weight ≈5 g, max stud torque 10–15 inch-pounds.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Stud (Body) | Cathode | Main current-carrying terminal; electrically connected to cathode; serves as mechanical mount and thermal path to heatsink |
| Eyelet Lead | Anode | Solder-dipped eyelet for PCB or busbar connection; carries forward current into the die |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic metal-glass seal | Enables long-term reliability in high-humidity, vacuum, or radiation-prone environments per MIL-PRF-19500/304 |
| JANTXV qualification | Meets highest military screening level including burn-in, temperature cycling, and lot acceptance testing |
| Low RθJC (2.0 °C/W) | Allows higher power dissipation without exceeding TJ max when mounted to properly torqued heatsink |
| Fast trr (200 ns) | Reduces switching losses and EMI generation in 20–100 kHz converter and chopper topologies |
Applications
| Military DC Power Supplies | Inverters & Motor Drives |
|---|---|
Use Scenario: High-reliability 28 VDC and 115 VAC-derived power conversion in airborne avionics units. IC Role / Device Role / Timing Role: Main output rectifier in full-wave bridge configuration handling 12 A continuous load. Use Value: JANTXV qualification and –65 °C to +175 °C operation ensure uninterrupted function across flight envelopes. | Use Scenario: DC link rectification in 400 Hz aircraft inverters driving hydraulic pumps. IC Role / Device Role / Timing Role: Free-wheeling diode across IGBTs in H-bridge motor control stages. Use Value: 200 ns trr minimizes tail current overlap loss during hard-switching transitions. |
| Ultrasonic Generators | Industrial Choppers |
Use Scenario: High-frequency (20–40 kHz) resonant power supply for ultrasonic welding stacks. IC Role / Device Role / Timing Role: Output rectifier in voltage-doubler or center-tapped transformer secondary. Use Value: Low VFM (1.5 V @ 38 A) reduces conduction loss at high peak currents typical in pulsed ultrasonic loads. | Use Scenario: Regenerative braking energy recovery in DC traction choppers for rail vehicles. IC Role / Device Role / Timing Role: Reverse-biased freewheeling path during switch-off intervals. Use Value: Hermetic seal prevents moisture-induced parameter drift during repeated thermal cycling in underfloor enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fast-recovery rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N3891A | 20 A IO rating (vs. 12 A), same VRRM (200 V), identical DO-203AA package and stud interface | Higher continuous current capability required in high-duty-cycle converters | Select 1N3891A when average forward current exceeds 12 A at TC = 100 °C |
| 1N3893 | 400 V VRRM (vs. 200 V), same IO (12 A), identical package and qualification level | Higher reverse voltage margin needed in 270 VDC aircraft systems or 3-phase rectifier bridges | Select 1N3893 when peak reverse voltage exceeds 200 V but current demand remains ≤12 A |
Compared with 1N3891, the 1N3891A offers +67% average current capacity without layout change, while the 1N3893 doubles reverse blocking capability - both retain JANTXV qualification, DO-203AA mounting, and 200 ns trr, enabling selective upgrade based on voltage or current bottleneck.
Availability
1N3891 is available at Aetrix Electronics and suitable for military DC power supplies, ultrasonic generators, industrial choppers, and inverter systems requiring stable component supply with traceable MIL-spec sourcing.
Supply support for 1N3891 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 1N3889–1N3893 family was developed specifically for ruggedized, high-temperature rectification in MIL-PRF-19500/304-qualified power conversion systems where hermeticity and fast recovery are mandatory.
FAQ
What is the maximum average forward current rating for the 1N3891 at 100 °C case temperature?
The 1N3891 has a maximum average forward current (IO) rating of 12 A at TC = 100 °C, derating linearly by 2% per °C above that temperature. This value is specified for 180° conduction angle, 60 Hz half-sine wave, and applies to the standard (non-"A") version. The 1N3891A variant increases this to 20 A under identical conditions.
Does the 1N3891 meet military specifications, and which levels are qualified?
Yes, the 1N3891 is qualified per MIL-PRF-19500/304 for JAN, JANTX, and JANTXV reliability levels. JANTXV qualification includes rigorous screening such as burn-in, temperature cycling, and lot acceptance testing. Note that 1N3889 is excluded from JANTXV qualification per the datasheet.
What is the reverse recovery time (trr) specification for the 1N3891, and under what test conditions?
The 1N3891 has a maximum reverse recovery time (trr) of 200 ns, measured at IF = 1 A, VR = 30 V, di/dt = 25 A/µs, and TC = 55 °C. This value applies to all variants (1N3891, 1N3891R, 1N3891AR) and is confirmed in the Electrical Characteristics table on page 3 of T4-LDS-0143 Rev. 2.
How is polarity indicated on the 1N3891, and what does "R" suffix mean in the part number?
The 1N3891 uses cathode-to-stud polarity by default. An "R" suffix (e.g., 1N3891R) indicates reversed polarity - anode-to-stud - and is marked with an "R" following the last digit on the device body. Standard (non-R) units have no polarity marking beyond the manufacturer's ID and date code.
What is the thermal resistance junction-to-case (RθJC) for the 1N3891, and how does it affect heatsink design?
The 1N3891 has RθJC = 2.0 °C/W for non-"A" versions. This value defines the thermal gradient between the silicon junction and the metal case/stud. When designing heatsinks, this resistance must be combined with heatsink-to-ambient resistance to ensure TJ remains ≤+175 °C under worst-case power dissipation and ambient conditions.
1N3891 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-203AA, DO-4, Stud
- Packaging:
- Bulk
- Product Status:
- Active
- Technology:
- Standard
- Voltage - DC Reverse (Vr) (Max):
- 200 V
- Current - Average Rectified (Io):
- 12A
- Voltage - Forward (Vf) (Max) @ If:
- 1.5 V @ 38 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- 200 ns
- Current - Reverse Leakage @ Vr:
- 25 µA @ 50 V
- Capacitance @ Vr, F:
- 115pF @ 10V, 1MHz
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Stud Mount
- Supplier Device Package:
- DO-203AA (DO-4)
- Operating Temperature - Junction:
- -65°C ~ 175°C
1N3891 FAQ
1.How can I place an order for 1N3891 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N3891 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 1N3891 reliable?
The price and inventory of 1N3891 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N3891 is usually 5 days.
3.What payment methods are accepted for 1N3891?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N3891 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N3891?
1N3891 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N3891 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 1N3891?
For technical support, including 1N3891 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N3891 requirements.
6.How does Aetrix verify that 1N3891 is sourced from the original manufacturer or authorized distributors?
All 1N3891 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 1N3891 meets industry standards.
7.What is the process for return or replacement of 1N3891?
All 1N3891 units undergo pre-shipment inspection (PSI). If there is an issue with 1N3891, 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 1N3891 part is unused and in its original packaging.
Return procedure for 1N3891:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N3891 Tags
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