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Microchip Technology 1N5661A
- Part No.:
- 1N5661A
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- DO-13
- Datasheet:
-
1N5661A.pdf
- Description:
- TVS DIODE 128VWM 207VC DO13
- Quantity:
- Payment:
- Shipping:
Inventory:5,726
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Product details
Overview
1N5661A from Microchip (formerly Microsemi) is a unidirectional transient voltage suppressor (TVS) diode in a hermetically sealed DO-13 metal package, designed for high-reliability surge protection in aerospace and industrial systems. It features a 121 V rated standoff voltage (VWM), 135 V minimum breakdown voltage (V(BR)), 215 V maximum clamping voltage (VC) at 7.0 A peak pulse current, and 1500 W peak pulse power rating per 10/1000 µs waveform - commonly deployed in avionics power rail protection.
For engineers reviewing the 1N5661A datasheet, 1N5661A pinout, 1N5661A application, or 1N5661A equivalent, key selection criteria include its military-grade hermetic DO-13 package, sub-100 ps response time, IEC 61000-4-2/4-4/4-5 compliance for ESD/EFT/secondary lightning, and tight ±5% V(BR) tolerance enabled by the "A" suffix.
Technical Context
The 1N5661A operates as a unidirectional avalanche diode, entering controlled breakdown when reverse voltage exceeds V(BR) = 135–143 V, clamping transients to ≤215 V while conducting up to 7.0 A (10/1000 µs). Its thermal resistance is 50°C/W junction-to-lead, enabling robust surge handling at TL = 25°C with no derating required below +125°C lead temperature.
It is explicitly qualified to MIL-PRF-19500/500 under JANTXV level when ordered with prefix (e.g., JANTXV1N5661A), and its DO-13 package features cathode-connected metal case polarity marking, tin-lead plating per MIL-STD-750, and inherent radiation hardness per MicroNote 050.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 121 V - maximum continuous reverse operating voltage before conduction begins; sets minimum system rail voltage compatibility |
| V(BR) @ I(BR) | 135–143 V @ 1 mA - precise avalanche onset range enabling accurate overvoltage threshold setting |
| VC @ IPP | 215 V @ 7.0 A - clamped voltage during 10/1000 µs surge; defines worst-case stress on downstream circuitry |
| PPP | 1500 W - peak pulse power handling capability; supports high-energy transients in inductive switching environments |
| Response Time | <100 ps - enables effective suppression of ESD (IEC 61000-4-2) and fast EFT bursts (IEC 61000-4-4) |
| Operating Temp | −55°C to +175°C - supports deployment in extreme environments including engine bays and space-grade avionics |
| Package | DO-13 (DO-202AA) - hermetically sealed metal-glass case with cathode-to-case polarity and MIL-spec finish |
Pinout & Package
1N5661A uses the DO-13 (DO-202AA) axial-leaded, hermetically sealed metal package. The cathode is electrically connected to the metal case and marked with a diode symbol on the body. Leads are tin-lead plated per MIL-STD-750 method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Lead 2) | Positive terminal under forward bias; connected to protected line | Accepts transient energy during reverse avalanche; must be routed with low-inductance trace to ground reference |
| Cathode (Lead 1 / Case) | Ground reference terminal; internally tied to metal case | Provides low-impedance path to chassis/ground plane; requires direct mechanical and electrical mounting to grounded metal surface |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic DO-13 metal package | Enables operation in high-humidity, vacuum, and radiation-intensive environments without parameter drift or seal failure |
| 1500 W peak pulse power (10/1000 µs) | Withstands repetitive surges from relay coil flyback, motor commutation, and secondary lightning coupling |
| ±5% V(BR) tolerance (A-suffix) | Ensures predictable clamping threshold across production lots - critical for MIL-qualified system margining |
| Inherent radiation hardness | Validated per MicroNote 050; suitable for avionics and satellite subsystems without additional shielding or screening |
| JANTXV qualification option | Supports full MIL-PRF-19500/500 compliance when ordered as JANTXV1N5661A, including extended testing and traceability |
Applications
| Aerospace Power Distribution | Industrial Motor Control |
|---|---|
Use Scenario: Protection of 115 VAC aircraft bus converters and DC-DC regulators against load dump and lightning-induced surges. IC Role / Device Role / Timing Role: Unidirectional TVS diode clamping reverse transients on primary-side input rails. Use Value: 215 V clamping voltage ensures downstream SiC MOSFET gate drivers remain within safe SOA during 1500 W surges. |
Use Scenario: Input rail protection for PLC I/O modules exposed to inductive kickback from solenoid valves and contactors. IC Role / Device Role / Timing Role: Fast-acting surge limiter placed directly at connector entry point. Use Value: Sub-100 ps response prevents latch-up in isolated RS-485 transceivers during 4 kV EFT bursts. |
| Military Vehicle Electronics | Energy Metering Systems |
Use Scenario: DC power input protection in armored vehicle communication nodes subjected to MIL-STD-461G CS115 pulses. IC Role / Device Role / Timing Role: Primary-level transient suppressor mounted on chassis-grounded heatsink. Use Value: Hermetic DO-13 package maintains V(BR) stability after 1000-hour salt fog exposure per MIL-STD-810H. |
Use Scenario: Surge immunity enhancement for smart meter AC mains interface circuits per IEC 61000-4-5 Class 3 (42 Ω source). IC Role / Device Role / Timing Role: Standoff-rated protector on meter's front-end rectifier input. Use Value: 121 V VWM aligns precisely with 115 V nominal AC-derived DC bus, minimizing leakage while ensuring margin. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMCJ120A | Surface-mount SMC package; 120 V VWM; 133–147 V V(BR); same 1500 W rating but higher thermal resistance (junction-to-ambient) | Used where PCB space is constrained and reflow assembly is preferred; lacks hermeticity and radiation hardness | Select for commercial industrial designs requiring automated assembly and lower cost; not suitable for aerospace or high-reliability mil-spec use |
| 1N5661 | Same DO-13 package and electrical specs but wider V(BR) tolerance (135–152 V vs. 135–143 V); no "A"-suffix precision grading | Applicable where ±7.5% V(BR) variation is acceptable; not qualified to MIL-PRF-19500/500 | Choose for non-military cost-sensitive applications where tighter V(BR) control and radiation hardness are unnecessary |
Compared with 1N5661A, SMCJ120A offers SMT compatibility but sacrifices hermetic sealing and radiation tolerance, while 1N5661 provides identical form factor and basic protection at lower test grade - making 1N5661A the only choice for JANTXV-qualified, high-reliability deployments.
Availability
1N5661A is available at Aetrix Electronics and suitable for aerospace power distribution, industrial motor control, military vehicle electronics, and energy metering systems requiring stable component supply with long-term obsolescence management.
Supply support for 1N5661A 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
Microchip Technology acquired Microsemi in 2018 and now manufactures high-reliability discrete semiconductors including radiation-hardened and military-qualified components.
The 1N5661A belongs to Microchip's legacy TVS diode family originally developed by Microsemi for defense and aerospace applications, emphasizing hermetic packaging, tight parametric control, and compliance with MIL-PRF-19500/500.
FAQ
What is the clamping voltage of the 1N5661A under a 10/1000 µs surge?
The 1N5661A has a maximum clamping voltage (VC) of 215 V when subjected to its rated 7.0 A peak pulse current (IPP) under the standard 10/1000 µs waveform. This value is guaranteed across the full operating temperature range and reflects worst-case device behavior during transient events, ensuring downstream components remain within safe voltage limits.
Is the 1N5661A suitable for IEC 61000-4-5 secondary lightning protection?
Yes, the 1N5661A is validated for IEC 61000-4-5 secondary lightning protection up to Class 4 with 42 Ω source impedance (covers 1N5629 to 1N5648A group), and Class 3 with 2 Ω source impedance. Its 1500 W peak pulse rating and sub-100 ps response enable reliable suppression of coupled lightning surges in avionics and industrial control cabinets.
Does the 1N5661A have military qualification options?
Yes - the 1N5661A is the precision-tolerance variant (±5% V(BR)) eligible for full JANTXV qualification per MIL-PRF-19500/500 when ordered with the JANTXV prefix (e.g., JANTXV1N5661A). This includes extended environmental testing, lot traceability, and radiation hardness verification per MicroNote 050.
What is the thermal resistance of the 1N5661A, and how does it affect surge handling?
The 1N5661A has a junction-to-lead thermal resistance (RθJL) of 50°C/W when measured at 0.375 inches (10 mm) from the case. This low thermal resistance allows efficient heat transfer from the silicon junction to the PCB or chassis during transient events, supporting repeated 1500 W surges without thermal runaway - provided lead temperature remains ≤+125°C.
How is polarity marked on the 1N5661A DO-13 package?
The 1N5661A uses cathode-to-case polarity: the metal case and Lead 1 (shorter lead, per DO-13 standard) are internally connected to the cathode. Polarity is marked on the body with a molded diode symbol pointing toward the cathode end. This configuration requires the case to be electrically tied to system ground for proper transient shunting.
1N5661A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Package/Case:
- DO-13
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Discontinued at Digi-Key
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 128V
- Voltage - Breakdown (Min):
- 143V
- Voltage - Clamping (Max) @ Ipp:
- 207V
- Current - Peak Pulse (10/1000µs):
- 7.2A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-13
1N5661A FAQ
1.How can I place an order for 1N5661A through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5661A 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 1N5661A reliable?
The price and inventory of 1N5661A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5661A is usually 5 days.
3.What payment methods are accepted for 1N5661A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5661A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5661A?
1N5661A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5661A 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 1N5661A?
For technical support, including 1N5661A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5661A requirements.
6.How does Aetrix verify that 1N5661A is sourced from the original manufacturer or authorized distributors?
All 1N5661A 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 1N5661A meets industry standards.
7.What is the process for return or replacement of 1N5661A?
All 1N5661A units undergo pre-shipment inspection (PSI). If there is an issue with 1N5661A, 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 1N5661A part is unused and in its original packaging.
Return procedure for 1N5661A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5661A Tags
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