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Vishay General Semiconductor - Diodes Division SMPC51AN-M3/I
- Part No.:
- SMPC51AN-M3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- TO-277, 3-PowerDFN
- Datasheet:
-
SMPC51AN-M3/I.pdf
- Description:
- TVS DIODE 51VWM 82.4VC TO277A
- Quantity:
- Payment:
- Shipping:
Inventory:3,735
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Product details
Overview
SMPC51AN-M3/I from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in the TRANSZORB® family, designed for high-energy surge protection on DC power rails and signal lines. It features a 51.0 V stand-off voltage (VWM), 56.7–62.7 V breakdown voltage (VBR), 1500 W peak pulse power (PPPM), and clamps to ≤82.4 V at 18.2 A IPPM under 10/1000 μs waveform - deployed in automotive sensor interfaces and industrial power supply inputs.
For engineers reviewing the SMPC51AN-M3/I datasheet, SMPC51AN-M3/I pinout, SMPC51AN-M3/I application, or SMPC51AN-M3/I equivalent, this page delivers verified electrical parameters, JEDEC TO-277A package details, AEC-Q101 qualification status, thermal resistance data, and real-world protection use cases - all aligned with Vishay Document #89116 (Rev. 17-Sep-2021).
Technical Context
This device operates as a unidirectional avalanche diode, leveraging silicon p-n junction clamping to divert transient energy away from sensitive downstream circuitry. Its low incremental surge resistance and fast response time (<1 ns) enable effective suppression of ESD, lightning-induced surges, and inductive switching spikes.
Rated for operation from −55 °C to +150 °C, it supports mounting on FR4 PCB with 2 oz. copper, delivering 85–100 °C/W junction-to-ambient thermal resistance (RθJA) and 2.5–3.0 °C/W junction-to-mount (RθJM) - critical for thermal management in compact automotive and industrial modules.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 51.0 V - maximum continuous reverse operating voltage before clamping begins; sets safe DC rail margin for 48 V systems. |
| VBR min/max | 56.7 V / 62.7 V at 1.0 mA - defines guaranteed avalanche onset range; ensures consistent turn-on across temperature and unit variance. |
| PPPM | 1500 W (10/1000 μs) - peak transient energy absorption capability; protects against IEC 61000-4-5 Level 4 surges. |
| VC @ IPPM | ≤82.4 V at 18.2 A - clamped voltage during full-rated surge; determines maximum stress on protected ICs or MOSFETs. |
| TJ max | +150 °C - maximum junction temperature; enables use in under-hood automotive environments and sealed industrial enclosures. |
| RθJA | 85–100 °C/W - thermal resistance to ambient on standard FR4; informs heatsinking requirements and power derating above 25 °C. |
| Polarity | Unidirectional - blocks reverse current only; requires correct cathode-band orientation during PCB layout. |
Pinout & Package
Package: SMPC (TO-277A), surface-mount, 3-terminal configuration with cathode band marking. Height: 1.1 mm typical; meets UL 94 V-0 flammability rating. Matte tin-plated leads, J-STD-002 solderable, JESD 201 Class 2 whisker compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode 1 | Primary anode connection | One of two parallel anode terminals; reduces series inductance and improves surge current sharing in high-di/dt events. |
| Anode 2 | Secondary anode connection | Electrically tied to Anode 1 internally; used for dual-pad routing to enhance thermal conduction and mechanical stability. |
| Cathode (band end) | Clamping output node | Connected to protected line (e.g., 48 V rail); carries full surge current to ground during transient events. |
Key Features
| Feature | Design Value |
|---|---|
| Very low profile (1.1 mm height) | Enables integration into space-constrained modules such as ADAS camera housings and motor control PCBs without height interference. |
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - required for front-end protection in ECUs and body controllers. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast transients, improving clamping precision for 3.3 V/5 V logic-level interface protection. |
| MSL Level 1 (260 °C peak) | Compatible with standard lead-free reflow profiles; no moisture sensitivity handling required prior to assembly. |
| Halogen-free & RoHS-compliant | Meets global environmental compliance mandates for industrial and automotive OEM supply chains without performance trade-offs. |
Applications
| Automotive Sensor Protection | Industrial 48 V Power Rail |
|---|---|
Use Scenario: Protecting CAN/LIN transceivers and analog sensor front-ends (e.g., pressure, temperature) from load-dump and jump-start transients in vehicle subsystems. IC Role / Device Role / Timing Role: Unidirectional TVS placed between sensor supply line and chassis ground, clamping surges before they reach ASIC input pins. Use Value: Maintains VWM = 51.0 V margin above nominal 45 V battery system, ensuring no false triggering while suppressing >100 V transients per ISO 7637-2 Pulse 5a. | Use Scenario: Safeguarding DC-DC converter inputs and PMICs in factory automation controllers powered by 48 V PoE++ or centralized power buses. IC Role / Device Role / Timing Role: Primary overvoltage clamp on main input rail, coordinated with upstream fuses and downstream LDOs to define fault containment boundary. Use Value: Withstands 1500 W peak pulses and clamps to ≤82.4 V, preventing damage to 100 V-rated MOSFETs and enabling robust 48 V system design. |
| Telecom Line Interface | Motor Drive Gate Protection |
Use Scenario: Shielding RS-485/RS-422 transceiver I/O lines in outdoor base station equipment exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Bidirectionally configured pair (using two unidirectional devices) across differential pair to ground, meeting IEC 61000-4-5 4 kV/2 Ω coupling. Use Value: Fast <1 ns response and low clamping voltage preserve signal integrity on 10 Mbps+ serial links while absorbing multi-kW transients. | Use Scenario: Guarding high-side gate drivers in BLDC inverters against Miller-induced voltage spikes during fast IGBT/MOSFET switching. IC Role / Device Role / Timing Role: Localized TVS mounted directly at gate driver output, shunting dv/dt-induced currents before reaching gate oxide. Use Value: Low incremental resistance and 18.2 A IPPM capability prevent gate overvoltage failure during 100 A+ motor phase commutation events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ51A-M3/5A | Same VWM (51 V) and PPPM (400 W), but lower peak power (400 W vs. 1500 W); SMA package (higher RθJA ≈ 140 °C/W). | Not suitable for high-energy surges (e.g., ISO 7637-2 Pulse 5); limited to low-power signal lines or secondary protection stages. | Select when board space is constrained and surge threat level is ≤400 W; verify thermal margin with RθJA derating. |
| SMCJ51A-M3/86A | Same VWM (51 V) and PPPM (1500 W), but SMC package (larger footprint, higher thermal mass); RθJA ≈ 15 °C/W with heatsink. | Better thermal performance in high-ambient environments, but incompatible with ultra-thin modules due to 2.3 mm height. | Prefer when sustained surge duty cycle or elevated ambient temperatures (>85 °C) require superior heat dissipation. |
Compared with SMAJ51A-M3/5A and SMCJ51A-M3/86A, the SMPC51AN-M3/I delivers identical 51 V standoff and 1500 W surge rating in a 1.1 mm low-profile TO-277A package with AEC-Q101 qualification - making it the optimal choice for automotive and space-limited industrial designs requiring validated reliability and minimal Z-height.
Availability
SMPC51AN-M3/I is available at Aetrix Electronics and suitable for automotive sensor protection, industrial 48 V power rail hardening, and telecom line interface surge suppression requiring stable component supply and long-term lifecycle support.
Supply support for SMPC51AN-M3/I 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
Vishay General Semiconductor is a global leader in discrete semiconductors, specializing in diodes, rectifiers, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMPC series targets high-energy transient suppression in automotive and industrial systems, engineered for AEC-Q101 compliance, low-profile mounting, and robust surge handling in harsh thermal and electrical environments.
FAQ
What is the maximum clamping voltage of the SMPC51AN-M3/I under rated surge conditions?
The SMPC51AN-M3/I clamps to a maximum of 82.4 V when subjected to its rated 18.2 A peak pulse current (IPPM) under a 10/1000 μs waveform. This value is measured with the cathode mounted on heatsink per Vishay Document #89116, and defines the upper voltage limit imposed on protected circuitry during worst-case transients. The SMPC51AN-M3/I maintains this clamping performance across its full operating temperature range.
Is the SMPC51AN-M3/I qualified for automotive applications?
Yes, the SMPC51AN-M3/I is AEC-Q101 qualified, as confirmed in Vishay's ordering information table (Document #89116, page 3) where "HM3" suffix denotes qualification and "SMPC51AN-M3/I" falls within the SMPC22AN–SMPC85AN qualified range. It undergoes stress testing for temperature cycling, high-temperature reverse bias, and ESD - making it suitable for engine control units, ADAS sensors, and body electronics.
What does the "I" suffix in SMPC51AN-M3/I indicate?
Per Vishay's ordering table (page 3), the "I" suffix denotes packaging in 13-inch diameter plastic tape and reel, with a base quantity of 6500 units. It is functionally identical to other SMPC51AN-M3 variants (e.g., /H), differing only in delivery format - not electrical, thermal, or reliability characteristics. The SMPC51AN-M3/I remains halogen-free, RoHS-compliant, and AEC-Q101 qualified.
How does the SMPC51AN-M3/I differ from the non-"AN" variant SMPC51A?
The SMPC51AN-M3/I belongs to the AN-series, which specifies AEC-Q101 qualification and is available only from SMPC22AN through SMPC85AN. In contrast, the SMPC51A (without "N") is part of the non-automotive SMPC5.0A–SMPC36A family and lacks AEC-Q101 validation. Both share identical VWM (51.0 V), VBR, and PPPM (1500 W), but only SMPC51AN-M3/I is approved for automotive use.
What is the thermal resistance junction-to-ambient (RθJA) for SMPC51AN-M3/I on standard FR4?
The SMPC51AN-M3/I exhibits a typical RθJA of 85 °C/W and a maximum of 100 °C/W when mounted on a standard FR4 PCB with 2 oz. copper and Vishay's recommended footprint (Document #89116, page 3). This value assumes no external heatsink and governs power derating above 25 °C ambient - for example, PD drops to ~0.8 W at TA = 70 °C.
SMPC51AN-M3/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- TO-277, 3-PowerDFN
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 51V
- Voltage - Breakdown (Min):
- 56.7V
- Voltage - Clamping (Max) @ Ipp:
- 82.4V
- Current - Peak Pulse (10/1000µs):
- 18.2A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-277A (SMPC)
SMPC51AN-M3/I FAQ
1.How can I place an order for SMPC51AN-M3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMPC51AN-M3/I 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 SMPC51AN-M3/I reliable?
The price and inventory of SMPC51AN-M3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMPC51AN-M3/I is usually 5 days.
3.What payment methods are accepted for SMPC51AN-M3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMPC51AN-M3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMPC51AN-M3/I?
SMPC51AN-M3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMPC51AN-M3/I 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 SMPC51AN-M3/I?
For technical support, including SMPC51AN-M3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMPC51AN-M3/I requirements.
6.How does Aetrix verify that SMPC51AN-M3/I is sourced from the original manufacturer or authorized distributors?
All SMPC51AN-M3/I 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 SMPC51AN-M3/I meets industry standards.
7.What is the process for return or replacement of SMPC51AN-M3/I?
All SMPC51AN-M3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMPC51AN-M3/I, 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 SMPC51AN-M3/I part is unused and in its original packaging.
Return procedure for SMPC51AN-M3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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