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Microchip Technology JAN1N3957/TR
- Part No.:
- JAN1N3957/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Diodes
- Package:
- A, Axial
- Datasheet:
-
JAN1N3957/TR.pdf
- Description:
- DIODE GEN PURP 1KV 1A
- Quantity:
- Payment:
- Shipping:
Inventory:2,160
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Product details
Overview
JAN1N3957/TR from Microsemi is a military-qualified standard-recovery axial-lead glass rectifier diode rated for 1000 V peak reverse voltage, 1.0 A average forward current at 100°C, and 30 A surge current (8.3 ms), used in high-reliability power conversion circuits such as bridge rectifiers and flyback catch diodes in aerospace and defense systems.
For engineers reviewing the JAN1N3957/TR datasheet, JAN1N3957/TR pinout, JAN1N3957/TR application, or JAN1N3957/TR equivalent, key selection criteria include its hermetically sealed voidless-glass package, Category I metallurgical bond, -65°C to +175°C operating temperature range, controlled avalanche capability, and MIL-PRF-19500/228 qualification.
Technical Context
This diode operates as a unidirectional power rectifier with standard recovery characteristics, optimized for reliability-critical DC power supply front-ends where thermal robustness and radiation hardness are required. Its 38°C/W junction-to-lead thermal resistance and tungsten slug construction support stable operation under sustained 1 A loads at elevated ambient temperatures.
The device exhibits controlled avalanche behavior up to 300 W peak reverse power and maintains leakage ≤1.0 μA at 1000 V reverse bias, enabling use in clamping and transient protection roles alongside primary rectification. It is not suitable for high-frequency switching due to its standard (non-fast) recovery time.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Reverse Voltage (VRWM) | 1000 V - Maximum continuous reverse bias before breakdown; defines maximum AC input voltage in bridge rectifier designs. |
| Breakdown Voltage (VBR) | 1150 V min @ 100 μA - Ensures margin against transient overvoltage events without catastrophic failure. |
| Avg Forward Current (IO) | 1.0 A @ 100°C - Sustained DC output capability in convection-cooled power supplies. |
| Forward Voltage (VF) | 1.1 V max @ 1 A pulsed - Determines conduction loss and thermal dissipation in linearly regulated or transformer-fed supplies. |
| Surge Current (IFSM) | 30 A @ 8.3 ms - Withstands inrush into capacitive loads or short-circuit transients without degradation. |
| Reverse Leakage (IR) | 1.0 μA max @ 1000 V - Enables low-power standby modes and minimizes wasted energy in high-impedance bias networks. |
| Junction Temp Range | -65°C to +175°C - Supports operation in extreme environments including space-grade and engine-bay electronics. |
Pinout & Package
Package: Axial-lead, hermetically sealed voidless hard glass case with tungsten slugs; cathode identified by painted band; lead finish: Sn/Pb; weight ≈ 500 mg; dimensions per MIL-PRF-19500/228 "A" package drawing (BD: 0.060–0.110", BL: 0.125–0.205", LD: 0.025–0.034", LL: 0.600–1.500").
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Lead 1) | Positive input terminal | Connects to AC source or transformer secondary; carries full forward current during conduction half-cycle. |
| Cathode (Lead 2) | Negative output terminal | Marked with painted band; delivers rectified DC output; interfaces with bulk capacitor or regulator input. |
Key Features
| Feature | Design Value |
|---|---|
| Voidless hermetic glass seal | Prevents moisture ingress and internal corrosion over decades of field operation in humid or vacuum environments. |
| Category I metallurgical bond | Ensures mechanical integrity and thermal cycling reliability under shock/vibration in avionics and missile guidance systems. |
| Controlled avalanche capability | Allows safe clamping of inductive kickback up to 300 W peak reverse power without parameter drift. |
| Radiation hardness | Inherently resistant to total ionizing dose (TID) per Microsemi MicroNote 050 - suitable for low-earth orbit missions. |
| MIL-PRF-19500/228 qualification | Validated through lot acceptance testing for screening, burn-in, and environmental stress; traceable to military procurement standards. |
Applications
| Avionics Power Supply | Military Radar Transmitter |
|---|---|
Use Scenario: Rectifying 400 Hz aircraft generator output into stable DC bus for flight control computers and sensors. IC Role / Device Role / Timing Role: Primary AC-to-DC conversion element in full-wave bridge configuration. Use Value: 1000 V VRWM withstands line surges up to ±200 V; -65°C to +175°C rating supports operation across cabin-to-engine bay thermal gradients. | Use Scenario: Catch diode across pulse transformer secondary in high-voltage modulator stage. IC Role / Device Role / Timing Role: Freewheeling path for magnetron drive current during off-state. Use Value: 30 A surge rating absorbs 10 kV/μs transients; controlled avalanche prevents destructive voltage overshoot during rapid turn-off. |
| Satellite Power Management | Ground Vehicle ECU |
Use Scenario: Input rectifier in solar array regulator feeding battery charge controller in LEO satellite. IC Role / Device Role / Timing Role: High-reliability DC generation node exposed to radiation and thermal cycling. Use Value: Inherent radiation hardness eliminates need for shielding; hermetic seal prevents outgassing-induced failure in vacuum. | Use Scenario: Bridge rectifier in 24 V diesel engine control unit powering solenoid drivers and CAN transceivers. IC Role / Device Role / Timing Role: Mainline AC/DC conversion for embedded microcontroller and analog subsystems. Use Value: 1.1 V VF ensures <1.1 W conduction loss at 1 A; 38°C/W thermal resistance enables PCB-mount operation without heatsink. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| JAN1N3614 | 800 V VRWM (vs. 1000 V); identical IO, VF, IFSM, and package | Limited to lower-input-voltage AC sources; unsuitable for 1000 V-class line filtering | Select when system peak reverse stress is ≤800 V and cost optimization is prioritized. |
| 1N5622US | Surface-mount MELF package; same 1000 V VRWM, but 1.2 V VF and 25 A IFSM | Requires rework of PCB layout; lacks MIL-PRF-19500/228 qualification | Choose only for automated assembly where hermeticity and military screening are not required. |
Compared with JAN1N3957/TR, JAN1N3614 offers lower voltage margin but identical thermal and surge performance, while 1N5622US trades hermetic reliability and qualification for SMT compatibility and reduced board space - neither is pin-compatible, and both require design validation for mission-critical use.
Availability
JAN1N3957/TR is available at Aetrix Electronics and suitable for avionics power supplies, radar transmitter modules, satellite power management systems, and ground vehicle ECUs requiring stable component supply under extended temperature and radiation exposure conditions.
Supply support for JAN1N3957/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, radiation-hardened, and military-qualified analog and power devices.
The JAN1N3957/TR belongs to Microsemi's legacy MIL-PRF-19500/228 qualified rectifier family, designed specifically for defense, aerospace, and space applications demanding zero-failure tolerance and long-term parametric stability.
FAQ
What is the maximum working peak reverse voltage rating for JAN1N3957/TR?
The JAN1N3957/TR has a specified working peak reverse voltage (VRWM) of 1000 V, meaning it can reliably block up to 1000 V of reverse polarity voltage across its terminals within its operational temperature range. This rating is validated per MIL-PRF-19500/228 and confirmed in the T4-LDS-0190 datasheet. Exceeding this voltage risks breakdown, especially at elevated junction temperatures. The JAN1N3957/TR also features a minimum breakdown voltage (VBR) of 1150 V at 100 μA, providing a safety margin above VRWM.
Is JAN1N3957/TR suitable for surface-mount assembly?
No, the JAN1N3957/TR is an axial-lead through-hole device housed in a hermetically sealed glass package with tin/lead-plated copper leads. It is not compatible with reflow or wave soldering processes used for SMT. For surface-mount equivalents, Microsemi offers the 1N5622US in MELF configuration - however, that part lacks MIL-PRF-19500/228 qualification and uses different thermal and surge specifications. The JAN1N3957/TR must be manually or wave-soldered into plated-through holes.
Does JAN1N3957/TR have radiation-hardened characteristics?
Yes, the JAN1N3957/TR exhibits inherent radiation hardness due to its hermetic voidless-glass construction and tungsten slug metallurgy, as documented in Microsemi MicroNote 050. It is qualified to MIL-PRF-19500/228, which includes radiation survivability testing for total ionizing dose (TID). While not rated for extreme radiation environments like nuclear reactors, the JAN1N3957/TR is routinely deployed in low-earth orbit satellites and airborne systems where single-event effects and cumulative dose are concerns. Its performance remains stable up to specified TID levels without derating.
What is the thermal resistance specification for JAN1N3957/TR?
The JAN1N3957/TR has a junction-to-lead thermal resistance (RθJL) of 38°C/W when measured at a 3/8 inch (10 mm) lead length from the body, per the T4-LDS-0190 datasheet. This value reflects conduction-based heat transfer through the axial leads and is critical for estimating junction temperature rise under steady-state 1 A forward current. Unlike surface-mount parts, its thermal path relies on lead length and PCB copper area; shorter leads or added copper pour reduce effective RθJL. The JAN1N3957/TR does not specify junction-to-ambient resistance due to mounting dependency.
Can JAN1N3957/TR be used as a replacement for JAN1N3614 in existing designs?
JAN1N3957/TR is not a direct drop-in replacement for JAN1N3614 due to its higher 1000 V VRWM versus 800 V - while electrically safe in circuits originally using JAN1N3614, it may exhibit slightly higher forward voltage (1.1 V vs. same spec) and requires verification of mechanical fit and thermal margin. The JAN1N3957/TR shares identical package dimensions, current ratings, and surge capability, but its increased voltage rating does not guarantee improved performance in all failure modes. System-level validation, especially under surge and avalanche conditions, is required before substitution.
JAN1N3957/TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- A, Axial
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Standard
- Voltage - DC Reverse (Vr) (Max):
- 1000 V
- Current - Average Rectified (Io):
- 1A
- Voltage - Forward (Vf) (Max) @ If:
- 1.1 V @ 1 A
- Speed:
- Standard Recovery >500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 100 µA @ 300 V
- Capacitance @ Vr, F:
- -
- Grade:
- Military
- Qualification:
- MIL-PRF-19500/228
- Mounting Type:
- Through Hole
- Supplier Device Package:
- A, Axial
- Operating Temperature - Junction:
- -65°C ~ 175°C
JAN1N3957/TR FAQ
1.How can I place an order for JAN1N3957/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for JAN1N3957/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 JAN1N3957/TR reliable?
The price and inventory of JAN1N3957/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for JAN1N3957/TR is usually 5 days.
3.What payment methods are accepted for JAN1N3957/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for JAN1N3957/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for JAN1N3957/TR?
JAN1N3957/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your JAN1N3957/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 JAN1N3957/TR?
For technical support, including JAN1N3957/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your JAN1N3957/TR requirements.
6.How does Aetrix verify that JAN1N3957/TR is sourced from the original manufacturer or authorized distributors?
All JAN1N3957/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 JAN1N3957/TR meets industry standards.
7.What is the process for return or replacement of JAN1N3957/TR?
All JAN1N3957/TR units undergo pre-shipment inspection (PSI). If there is an issue with JAN1N3957/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 JAN1N3957/TR part is unused and in its original packaging.
Return procedure for JAN1N3957/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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