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Microchip Technology 1N5656A
- Part No.:
- 1N5656A
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- DO-13
- Datasheet:
-
1N5656A.pdf
- Description:
- TVS DIODE 77.8VWM 125VC DO13
- Quantity:
- Payment:
- Shipping:
Inventory:1,136
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Product details
Overview
1N5656A from Microchip Technology is a unidirectional transient voltage suppressor (TVS) diode in a hermetically sealed DO-13 metal package, designed for high-energy surge protection in aerospace, avionics, and industrial systems. It features a 77.8 V rated standoff voltage (VWM), 90.2 V minimum breakdown voltage (V(BR)), 125 A peak pulse current (IPP), and clamps transients to ≤131 V at 125 A with <100 ps response time.
For engineers reviewing the 1N5656A datasheet, 1N5656A pinout, 1N5656A application, or 1N5656A equivalent, this device is selected for secondary lightning protection per IEC61000-4-5 (42 Ω, Class 1–4), ESD/EFT immunity per IEC61000-4-2/4-4, and inductive switching transient suppression in harsh-environment power rails and signal lines.
Technical Context
The 1N5656A operates as a unidirectional avalanche diode, entering controlled breakdown when reverse voltage exceeds its 90.2 V minimum V(BR) at 1 mA test current. Its clamping action limits transient voltage to 131 V under 10/1000 µs waveform, delivering 1500 W peak pulse power without degradation.
Thermal design relies on low junction-to-lead thermal resistance (50 °C/W) and operation within -55 °C to +175 °C ambient range. Polarity is fixed: cathode is connected to the metal case, enabling direct chassis grounding for optimal EMI suppression and surge current shunting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 77.8 V - Maximum continuous reverse operating voltage before avalanche onset; sets minimum system rail compatibility. |
| V(BR) min | 90.2 V @ 1 mA - Guaranteed avalanche initiation threshold; ensures predictable turn-on margin above VWM. |
| VC @ IPP | 131 V @ 125 A - Peak clamped voltage during 10/1000 µs surge; defines worst-case overvoltage seen by protected circuitry. |
| PPP | 1500 W - Peak pulse power handling capability; supports high-energy transients without failure. |
| Response time | <100 ps - Enables effective suppression of ESD (IEC61000-4-2) and fast EFT bursts (IEC61000-4-4). |
| Operating temp | -55 °C to +175 °C - Supports deployment in avionics, downhole, and engine-control environments. |
| Package | DO-13 (DO-202AA) - Hermetic metal-glass construction ensures long-term reliability and radiation hardness per MicroNote 050. |
Pinout & Package
1N5656A uses a two-terminal DO-13 (DO-202AA) axial-leaded metal package with cathode connected directly to the case. The case serves as the cathode terminal and must be electrically tied to system ground or the protected node's return path for proper surge shunting.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Lead 2) | Transient input / protected line | Connected to the line requiring protection (e.g., power rail or signal trace); reverse-biased during normal operation. |
| Cathode (Case + Lead 1) | Ground reference / surge sink | Electrically bonded to metal case; must be low-inductance grounded to divert surge energy away from sensitive circuitry. |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic DO-13 metal package | Enables operation at 175 °C and provides inherent radiation hardness per MicroNote 050-critical for avionics and space-grade designs. |
| 1500 W peak pulse power | Supports robust secondary lightning protection per IEC61000-4-5 up to Class 4 (42 Ω source impedance) without derating. |
| <100 ps response time | Ensures clamping before ESD or EFT pulses propagate into IC inputs, meeting IEC61000-4-2 Level 4 (15 kV air, 8 kV contact) requirements. |
| Unidirectional polarity | Allows integration on DC-biased lines (e.g., +24 V sensors, RS-485 bias rails) without forward-conduction interference during normal operation. |
| Military qualification ready | "A" suffix denotes tighter tolerances; JANTXV prefix enables compliance with MIL-PRF-19500/500 for defense and aerospace programs. |
Applications
| Aerospace Power Distribution | Industrial Motor Drive Control |
|---|---|
Use Scenario: Protection of 28 V DC bus in aircraft avionics bays against load dump and induced RF transients from adjacent radar systems. IC Role / Device Role / Timing Role: Unidirectional TVS placed across bus and chassis ground to clamp surges before they reach power converters and flight control microcontrollers. Use Value: Maintains system uptime by preventing latch-up or gate oxide damage in downstream MOSFET drivers during 1500 W transients. |
Use Scenario: Shielding PLC I/O modules from inductive kickback generated by solenoid valves and contactors in factory automation cabinets. IC Role / Device Role / Timing Role: Standoff-rated TVS mounted at terminal block entry point to absorb 8.3 ms half-sine surges up to 200 A forward surge current. Use Value: Eliminates need for external snubbers while ensuring IEC61000-4-4 EFT immunity at 4 kV (5/50 ns) on 24 V control lines. |
| Railway Signaling Interface | Downhole Oilfield Sensor Electronics |
Use Scenario: Securing CAN bus termination resistors and transceivers in track-side signaling units exposed to lightning-induced ground potential rise. IC Role / Device Role / Timing Role: Bidirectional protection not required; unidirectional 1N5656A used on biased VCC line to prevent reverse conduction during surge events. Use Value: Achieves IEC61000-4-5 Class 3 compliance (42 Ω, 2 kV) with no PCB layout changes versus legacy 1N5655A due to identical DO-13 footprint. |
Use Scenario: Guarding analog front-end amplifiers in high-temperature pressure/temperature sensors deployed at >150 °C wellbore depths. IC Role / Device Role / Timing Role: Primary overvoltage clamp on excitation supply rail, leveraging hermetic seal and -55 °C to +175 °C rating for extended field life. Use Value: Prevents parametric drift and catastrophic failure caused by electrochemical migration in plastic-packaged alternatives under humid, high-voltage stress. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5655A | VWM = 73.7 V, VC = 125 V @ 114 A - lower clamping voltage but reduced surge capacity vs. 1N5656A. | Suitable for Class 3 (42 Ω) and Class 2 (12 Ω) IEC61000-4-5 only; not rated for Class 4 or 2 Ω source impedance. | Select when tighter clamping is prioritized over maximum surge headroom; same DO-13 package and pinout. |
| SMCJ78A | Surface-mount SMC package; VWM = 78 V, VC = 121 V @ 12.3 A - lower IPP (12.3 A) but higher power density per unit area. | Designed for automated assembly and compact PCBs; lacks hermetic seal and radiation hardness of 1N5656A. | Choose for cost-sensitive commercial designs where military qualification and extreme temperature operation are not required. |
Compared with 1N5656A, 1N5655A offers lower clamping but reduced surge margin, while SMCJ78A trades hermetic reliability and high-temperature capability for SMT manufacturability and smaller footprint-making 1N5656A the preferred choice for mission-critical avionics and downhole systems.
Availability
1N5656A is available at Aetrix Electronics and suitable for aerospace power distribution, industrial motor drive control, and railway signaling applications requiring stable component supply, long-lifecycle assurance, and qualified military-grade sourcing.
Supply support for 1N5656A 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 (formerly Microsemi) is a U.S.-based semiconductor company specializing in high-reliability analog, mixed-signal, and radiation-hardened components for aerospace, defense, and industrial markets.
The 1N5656A belongs to Microchip's legacy JAN/JANTXV-qualified TVS diode family, engineered specifically for survivability in high-energy transient environments including secondary lightning, ESD, and inductive switching-prioritizing hermeticity, temperature resilience, and military specification compliance.
FAQ
What is the maximum clamping voltage of the 1N5656A under standard test conditions?
The 1N5656A exhibits a maximum clamping voltage (VC) of 131 V when subjected to its rated 125 A peak pulse current (IPP) under the 10/1000 µs waveform. This value is guaranteed per the datasheet's Electrical Characteristics table and defines the upper voltage limit imposed on protected circuitry during surge events. The 1N5656A maintains this clamping performance across its full operating temperature range.
Is the 1N5656A suitable for bidirectional transient protection?
No, the 1N5656A is a unidirectional TVS diode and is not rated for bidirectional protection. Its electrical characteristics-including breakdown voltage, clamping behavior, and polarity marking-are specified only for reverse-bias operation. For bidirectional applications, Microchip recommends the separate 1N6036–1N6072A series in the same DO-13 package, as explicitly noted in the datasheet's Features section.
Does the 1N5656A meet IEC61000-4-5 for secondary lightning protection?
Yes, the 1N5656A is validated for secondary lightning protection per IEC61000-4-5 across multiple classes: Class 1–4 with 42 Ω source impedance, Class 1–3 with 12 Ω, and Class 2–3 with 2 Ω. These ratings are explicitly listed in the Applications/Benefits section of the datasheet and correlate directly to its 1500 W peak pulse power and 125 A IPP capability.
What is the thermal resistance specification for the 1N5656A?
The 1N5656A has a junction-to-lead thermal resistance (RθJL) of 50 °C/W when measured at 0.375 inches (10 mm) from the case body. This parameter is critical for calculating junction temperature rise during repetitive surge events and is specified in the Maximum Ratings section. It assumes lead temperature (TL) is maintained at 25 °C.
Can the 1N5656A be used in surface-mount designs?
No, the 1N5656A is a through-hole DO-13 axial-leaded device and is not compatible with surface-mount assembly. For SMT equivalents, Microchip specifies the SMCJ5.0–SMCJ170CA and SMCG5.0–SMCG170CA families in separate datasheets. These share voltage ratings but differ in package, thermal performance, and surge capability-requiring independent validation for each target application.
1N5656A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Package/Case:
- DO-13
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 77.8V
- Voltage - Breakdown (Min):
- 86.5V
- Voltage - Clamping (Max) @ Ipp:
- 125V
- Current - Peak Pulse (10/1000µs):
- 12A
- 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
1N5656A FAQ
1.How can I place an order for 1N5656A through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5656A 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 1N5656A reliable?
The price and inventory of 1N5656A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5656A is usually 5 days.
3.What payment methods are accepted for 1N5656A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5656A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5656A?
1N5656A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5656A 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 1N5656A?
For technical support, including 1N5656A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5656A requirements.
6.How does Aetrix verify that 1N5656A is sourced from the original manufacturer or authorized distributors?
All 1N5656A 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 1N5656A meets industry standards.
7.What is the process for return or replacement of 1N5656A?
All 1N5656A units undergo pre-shipment inspection (PSI). If there is an issue with 1N5656A, 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 1N5656A part is unused and in its original packaging.
Return procedure for 1N5656A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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