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Microchip Technology 1N1128A
- Part No.:
- 1N1128A
- Manufacturer:
- Microchip Technology
- Category:
- Single Diodes
- Package:
- DO-203AA, DO-4, Stud
- Datasheet:
-
1N1128A.pdf
- Description:
- DIODE GEN PURP 600V DO203AA
- Quantity:
- Payment:
- Shipping:
Inventory:9,998
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Product details
Overview
1N1128A from Microsemi is a high-reliability glass-passivated power rectifier diode rated for 600 V peak repetitive reverse voltage, 3.3 A average forward current at 150°C case temperature, and 25 A non-repetitive surge current (8.3 ms half-sine). It features glass-to-metal seal construction and is qualified per MIL-PRF-19500/260 for aerospace and defense power conversion systems.
For engineers reviewing the 1N1128A datasheet, 1N1128A pinout, 1N1128A application, or 1N1128A equivalent, key selection criteria include its 600 V VRRM rating, 2.2 V forward voltage at 10 A, 5 μA reverse leakage at 25°C, -65°C to +150°C operating case temperature range, and DO-203AA (DO-4) stud-mount package with anode-to-case polarity.
Technical Context
This axial-leaded, stud-mounted rectifier operates as a single-junction silicon PN device optimized for high-voltage DC power supply input stages and motor drive freewheeling paths. Its glass passivation ensures stable junction characteristics under thermal cycling and humidity stress.
The 1N1128A exhibits 2.0°C/W thermal resistance from junction to case, enabling direct heat sinking via its metal case. Reverse leakage remains ≤5 μA at VR = 600 V and Tj = 25°C, rising to ≤200 μA at Tj = 150°C - critical for high-temperature hold-off integrity in military-grade power systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 600 V - Maximum repetitive reverse voltage the device blocks reliably in AC line rectification or DC bus clamping. |
| IF(AV) | 3.3 A at TC = 150°C - Continuous forward current capability when mounted on heatsink maintaining case at 150°C. |
| IFSM | 25 A (8.3 ms half-sine) - Surge withstand for inrush current during power-up or fault recovery without junction failure. |
| VF | 2.2 V at IF = 10 A, Tj = 25°C - Forward conduction loss impacting efficiency and thermal design of high-current rectifier bridges. |
| IR | 5 μA at VR = 600 V, Tj = 25°C - Low leakage ensures minimal standby power loss and stable voltage hold-off in high-impedance circuits. |
| RθJC | 2.0°C/W - Enables precise thermal modeling: ΔTJ = 2.0 × PD, supporting heatsink sizing for continuous operation. |
| TC Range | -65°C to +150°C - Qualified for extreme-environment deployment including space-grade power supplies and avionics. |
Pinout & Package
Package: DO-203AA (DO-4), stud-mounted, glass-to-metal sealed, anode-connected to case (stud terminal). Case serves as anode; cathode is lead-wire.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Case/Stud | Anode | Electrically active terminal; must be isolated from chassis unless circuit requires common-anode configuration. |
| Lead Wire | Cathode | Insulated wire termination for PCB or terminal block connection; polarity must match schematic symbol orientation. |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated die | Prevents surface contamination and moisture ingress, ensuring long-term parameter stability in humid or corrosive environments. |
| Glass-to-metal seal construction | Provides hermeticity and mechanical robustness for shock/vibration resistance in aerospace and vehicle-mounted systems. |
| MIL-PRF-19500/260 qualification | Validates compliance with military screening, testing, and traceability requirements for Class H reliability applications. |
| 25 A surge rating | Supports reliable operation during transient overloads such as capacitor charging surges or motor stall currents. |
| DO-203AA stud-mount package | Enables low-inductance, high-current mounting directly to heatsinks or chassis with mechanical retention and thermal coupling. |
Applications
| Aerospace Power Supplies | Industrial Motor Drives |
|---|---|
Use Scenario: Input rectification stage in 270 VDC aircraft power distribution units requiring high-reliability, radiation-tolerant components. IC Role / Device Role / Timing Role: Power rectifier converting three-phase AC to regulated DC bus; anode tied to heatsink for thermal management. Use Value: 600 V VRRM and MIL-qualified construction ensure uninterrupted operation under lightning-induced transients and thermal cycling. | Use Scenario: Freewheeling diode across DC motor windings in servo amplifiers used in CNC machine tools. IC Role / Device Role / Timing Role: Clamp inductive kickback energy during PWM switching; mounted directly to aluminum heatsink via stud. Use Value: 25 A IFSM and 2.0°C/W RθJC prevent thermal runaway during rapid deceleration events with high back-EMF. |
| Military Radar Transmitters | High-Voltage Test Equipment |
Use Scenario: Modulator-stage rectifier in pulsed radar transmitter power supplies operating at 600 V DC output. IC Role / Device Role / Timing Role: High-voltage DC generation element; subjected to repetitive 10 ms pulses with 1 kHz repetition rate. Use Value: ≤5 μA IR at 600 V and 25°C maintains stable bias voltage during pulse-off intervals, minimizing drift. | Use Scenario: Output rectifier in programmable HV DC sources delivering up to ±500 V for semiconductor characterization. IC Role / Device Role / Timing Role: Precision high-voltage rectification with minimal leakage-induced offset error in feedback loops. Use Value: Glass passivation and hermetic seal prevent parameter shift over 10,000-hour calibration cycles under continuous bias. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-reliability power rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N1128RA | Anode-to-case polarity reversed (cathode connected to stud); identical VRRM, IF, IFSM, and thermal specs. | Required where circuit topology mandates cathode-grounded or cathode-heatsink configuration. | Select 1N1128RA only when schematic requires cathode as mounting terminal - not a drop-in replacement for 1N1128A. |
| 1N3650 | Same VRRM (600 V), but rated for 3.0 A IF(AV) at TC = 150°C and 20 A IFSM; uses same DO-203AA package. | Suitable for lower-current, cost-sensitive industrial designs where MIL-qualification is not required. | Choose 1N3650 only if MIL-PRF-19500/260 qualification is unnecessary and 0.3 A derating is acceptable. |
Compared with 1N1128RA and 1N3650, the 1N1128A provides full MIL-qualified reliability with 3.3 A continuous current and 25 A surge handling in anode-stud configuration - essential for mission-critical power conversion where parameter margin and process traceability are non-negotiable.
Availability
1N1128A is available at Aetrix Electronics and suitable for aerospace power supplies, industrial motor drives, military radar transmitters, and high-voltage test equipment requiring stable component supply across extended production lifecycles.
Supply support for 1N1128A 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) designs high-reliability analog and mixed-signal semiconductors for aerospace, defense, and industrial markets, emphasizing radiation tolerance, extended temperature operation, and military qualification.
The 1N1128A belongs to Microsemi's legacy high-reliability power rectifier product line, engineered specifically for MIL-PRF-19500/260-compliant DC power conversion in harsh-environment systems.
FAQ
What is the maximum reverse voltage rating for the 1N1128A?
The 1N1128A has a peak repetitive reverse voltage (VRRM) rating of 600 V. This value is specified in the Absolute Maximum Ratings table of the official Microsemi datasheet T4-LDS-0135 Rev. 1 and defines the highest AC or DC reverse voltage the device can block repeatedly without breakdown under normal operating conditions.
Is the 1N1128A qualified to any military specifications?
Yes, the 1N1128A is qualified per MIL-PRF-19500/260, a U.S. Department of Defense specification covering high-reliability semiconductor devices. This qualification includes rigorous environmental, electrical, and life testing - confirming the 1N1128A's suitability for aerospace and defense applications where failure is not acceptable.
What package type does the 1N1128A use, and how is polarity configured?
The 1N1128A uses the DO-203AA (DO-4) package with glass-to-metal seal construction. Its anode is electrically connected to the metal case/stud, and the cathode is brought out via an insulated lead wire - a configuration confirmed in the package notes and physical dimensions section of the T4-LDS-0135 datasheet.
What is the forward voltage drop of the 1N1128A at rated current?
The 1N1128A exhibits a forward voltage (VF) of 2.2 V when conducting 10 A at junction temperature of 25°C, as specified in the Electrical Characteristics table. This value directly impacts conduction losses and thermal design in high-current rectifier applications.
How does the 1N1128A differ from the 1N3650 in terms of reliability and rating?
The 1N1128A is MIL-PRF-19500/260 qualified with 3.3 A average forward current and 25 A surge rating, while the 1N3650 shares the same 600 V VRRM but is rated for 3.0 A IF(AV) and 20 A IFSM, and lacks formal military qualification - making the 1N1128A the appropriate choice for mission-critical deployments where process control and screening are mandatory.
1N1128A 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):
- 600 V
- Current - Average Rectified (Io):
- -
- Voltage - Forward (Vf) (Max) @ If:
- 2.2 V @ 10 A
- Speed:
- Standard Recovery >500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 5 µA @ 600 V
- Capacitance @ Vr, F:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Stud Mount
- Supplier Device Package:
- DO-203AA (DO-4)
- Operating Temperature - Junction:
- -65°C ~ 150°C
1N1128A FAQ
1.How can I place an order for 1N1128A through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N1128A 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 1N1128A reliable?
The price and inventory of 1N1128A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N1128A is usually 5 days.
3.What payment methods are accepted for 1N1128A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N1128A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N1128A?
1N1128A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N1128A 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 1N1128A?
For technical support, including 1N1128A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N1128A requirements.
6.How does Aetrix verify that 1N1128A is sourced from the original manufacturer or authorized distributors?
All 1N1128A 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 1N1128A meets industry standards.
7.What is the process for return or replacement of 1N1128A?
All 1N1128A units undergo pre-shipment inspection (PSI). If there is an issue with 1N1128A, 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 1N1128A part is unused and in its original packaging.
Return procedure for 1N1128A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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