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Vishay General Semiconductor - Diodes Division SMPC51ANHM3/I
- Part No.:
- SMPC51ANHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- TO-277, 3-PowerDFN
- Datasheet:
-
SMPC51ANHM3/I.pdf
- Description:
- TVS DIODE 51VWM 82.4VC TO277A
- Quantity:
- Payment:
- Shipping:
Inventory:6,415
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Product details
Overview
SMPC51ANHM3/I from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in the TRANSZORB® family, designed for robust overvoltage protection of sensitive electronics. 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 surge current - ideal for protecting automotive sensor signal lines against inductive switching transients.
For engineers reviewing the SMPC51ANHM3/I datasheet, SMPC51ANHM3/I pinout, SMPC51ANHM3/I application, or SMPC51ANHM3/I equivalent, this AEC-Q101-qualified device offers verified clamping performance, low-profile SMPC (TO-277A) packaging, and validated thermal derating up to 150 °C junction temperature in automotive-grade designs.
Technical Context
This TVS diode operates as a unidirectional clamping device with cathode-band polarity marking, requiring correct orientation in series with protected signal paths. Its low incremental surge resistance and fast response time ensure effective suppression of 10/1000 μs transients without compromising signal integrity in high-speed sensor interfaces.
Thermally, it delivers 1.25 W steady-state dissipation on FR4 PCB (2 oz copper) and exhibits RθJA ≤ 100 °C/W and RθJM ≤ 3 °C/W - enabling reliable operation under sustained ambient temperatures up to +125 °C when mounted with heatsink contact on either anode or cathode side per JEDEC 51-14 TDIM testing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 51.0 V - maximum continuous reverse operating voltage before clamping initiates; defines safe signal swing margin for 48 V automotive systems. |
| VBR min/max | 56.7 V / 62.7 V at 1 mA - guaranteed breakdown threshold range ensures consistent turn-on across production lots and temperature. |
| VC @ IPPM | ≤82.4 V at 18.2 A - clamping voltage during 10/1000 μs surge; limits downstream IC stress to safe levels below typical 100 V absolute max ratings. |
| PPPM | 1500 W - peak pulse power handling capability; supports IEC 61000-4-5 Level 4 (4 kV) surge immunity when properly laid out. |
| TJ max | +150 °C - maximum junction temperature rating; enables use in under-hood automotive environments with minimal thermal margin loss. |
| Package | SMPC (TO-277A) - surface-mount, 3-terminal, low-profile (1.1 mm height) package with matte tin leads compliant to J-STD-002 solderability. |
| AEC-Q101 | Qualified - certified for automotive applications per stress test requirements including HTOL, TC, UHAST, and ESD (HBM ≥ 8 kV). |
Pinout & Package
SMPC51ANHM3/I uses the SMPC (TO-277A) package: a 3-terminal surface-mount outline conforming to JEDEC TO-277A, with 1.1 mm typical height, UL 94 V-0 molding compound, and cathode band marking on the top surface. Terminals are matte tin-plated and qualified per JESD 22-B102 solderability and JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode 1 | Primary anode connection | Connected to protected circuit ground or low-side return path; must be routed with low-inductance trace for optimal clamping. |
| Anode 2 | Secondary anode connection | Electrically tied to Anode 1 internally; provides redundant thermal and current path to heatsink when mounted on metal substrate. |
| Cathode | Protected line input | Connected to signal/power line being protected; cathode band denotes this terminal; clamping occurs between Cathode and Anodes. |
Key Features
| Feature | Design Value |
|---|---|
| Unidirectional clamping | Enables integration into DC-biased signal paths (e.g., CAN, LIN, sensor analog outputs) without forward conduction during normal operation. |
| AEC-Q101 qualification | Validates reliability for automotive ECUs, ADAS sensors, and body control modules where field failure risk must be minimized. |
| Low-profile SMPC package | 1.1 mm height allows placement beneath connectors or in space-constrained modules such as radar front-ends and battery management units. |
| MSL Level 1 rating | Supports lead-free reflow up to 260 °C peak without moisture-induced damage - eliminates baking requirement in high-volume SMT lines. |
| Halogen-free & RoHS-compliant | Meets global environmental compliance mandates including EU RoHS Directive 2011/65/EU and JEDEC JS709E material definitions. |
Applications
| Automotive Sensor Protection | CAN Bus Transient Suppression |
|---|---|
|
Use Scenario: Protecting analog output lines of pressure, temperature, or position sensors in engine control units exposed to load-dump and inductive kick events. IC Role / Device Role / Timing Role: Unidirectional TVS placed between sensor output and microcontroller ADC input to clamp transients before they reach precision analog circuitry. Use Value: Maintains signal fidelity by limiting clamped voltage to ≤82.4 V while surviving 1500 W surges - preventing ADC saturation and latch-up in AEC-Q100 Grade 2 ICs. |
Use Scenario: Safeguarding CAN H/L differential pair against ESD and ISO 7637-2 pulse 1/2a/5a transients in vehicle infotainment gateways. IC Role / Device Role / Timing Role: Discrete TVS mounted directly at connector entry point, with cathode on CAN H and dual anodes grounded to chassis via low-inductance path. Use Value: Achieves <1 ns response time and clamps to ≤82.4 V, preserving CAN bit timing integrity and meeting ISO 11898-2 EMC immunity requirements without adding capacitance to the bus. |
| Industrial PLC I/O Protection | 48 V Telecom Power Rail Clamping |
|
Use Scenario: Shielding digital input channels of programmable logic controllers from field-wiring induced surges in factory automation environments. IC Role / Device Role / Timing Role: TVS connected between dry-contact input and internal optocoupler anode, referenced to isolated 24 V supply rail. Use Value: Withstands repetitive 1500 W pulses and maintains VWM = 51.0 V margin above nominal 24 V system voltage - eliminating false triggering during normal operation. |
Use Scenario: Protecting DC-DC converter inputs and PMICs on 48 V server power distribution boards from lightning-induced surges and hot-swap transients. IC Role / Device Role / Timing Role: Placed upstream of primary buck controller, with cathode on 48 V rail and dual anodes connected to system ground plane. Use Value: Delivers 1500 W peak power handling and 82.4 V clamping ceiling - ensuring downstream silicon remains within safe SOA during 10/1000 μs 4 kV surges per IEC 61000-4-5. |
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-E3/5A (Vishay) | Same VWM (51 V) and PPPM (400 W), but SMA package (higher RθJA ≈ 150 °C/W); lower surge current (10.3 A vs. 18.2 A). | Limited to lower-energy transients; unsuitable for AEC-Q101 automotive use or high-reliability industrial deployments. | Select only if board space constraints prohibit SMPC footprint and surge energy is confirmed ≤400 W. |
| TPSMD51A (Texas Instruments) | Identical VWM (51 V), higher VC (87.1 V at 17.2 A), same SMPC package, but not AEC-Q101 qualified; RθJM ≈ 3.5 °C/W. | Acceptable for industrial/commercial use but lacks automotive qualification evidence and has 4.7 V higher clamping voltage. | Choose for cost-sensitive non-automotive designs where 5 V higher clamping is tolerable and AEC-Q101 is not mandated. |
Compared with SMAJ51A-E3/5A and TPSMD51A, SMPC51ANHM3/I delivers superior surge current capacity (18.2 A), lower clamping voltage (82.4 V), and formal AEC-Q101 qualification - making it the preferred choice for automotive signal-line protection where reliability and precise clamping are critical.
Availability
SMPC51ANHM3/I is available at Aetrix Electronics and suitable for automotive sensor protection, CAN bus interface hardening, and 48 V telecom power rail clamping requiring stable component supply, long-term lifecycle support, and AEC-Q101 compliance verification.
Supply support for SMPC51ANHM3/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, MOSFETs, optoelectronics, and passive components with emphasis on high-reliability, high-efficiency solutions.
The SMPC series belongs to Vishay's TRANSZORB® TVS platform, engineered specifically for automotive-grade transient suppression in harsh environments - balancing low clamping voltage, high surge robustness, and compact surface-mount form factors.
FAQ
What is the clamping voltage of SMPC51ANHM3/I at its rated peak pulse current?
The SMPC51ANHM3/I clamps to a maximum of 82.4 V at its specified peak pulse current of 18.2 A under 10/1000 μs waveform conditions. This value is measured with the cathode on heatsink configuration per the datasheet's test setup and defines the upper voltage limit imposed on protected circuits during surge events - critical for ensuring downstream ICs remain within their absolute maximum ratings.
Is SMPC51ANHM3/I qualified for automotive applications?
Yes, SMPC51ANHM3/I is explicitly AEC-Q101 qualified, as confirmed by Vishay's ordering code suffix "HM3" and documentation stating AEC-Q101 qualification applies to SMPC22AN through SMPC85AN devices. This qualification covers stress tests including high-temperature operating life, temperature cycling, unbiased highly accelerated stress testing, and human-body-model ESD (≥8 kV), validating its suitability for under-hood and chassis-mounted automotive electronics.
What does the "I" suffix in SMPC51ANHM3/I indicate?
The "I" suffix in SMPC51ANHM3/I denotes the preferred package code for 13-inch diameter plastic tape and reel delivery, containing 6500 units per reel. This differs from the "H" suffix (1500 units per 7-inch reel) and reflects standard logistics configuration for high-volume SMT assembly - with identical electrical, thermal, and mechanical specifications to other SMPC51ANHM3 variants.
How does the SMPC (TO-277A) package improve thermal performance over standard SMA/SMB packages?
The SMPC (TO-277A) package used by SMPC51ANHM3/I features dual anode terminals that enable direct mounting to a heatsink or copper pour, achieving RθJM ≤ 3 °C/W - significantly lower than SMA/SMB packages (typically >10 °C/W). This allows SMPC51ANHM3/I to sustain higher surge duty cycles and operate reliably at elevated ambient temperatures common in automotive and industrial enclosures.
Can SMPC51ANHM3/I be used in bidirectional configurations?
No, SMPC51ANHM3/I is strictly unidirectional, as confirmed by its "AN" designation (Anode-Negative), polarity band marking, and electrical characteristics table specifying only VBR and VC for reverse-biased operation. For bidirectional protection, Vishay offers separate SMPCxxCA devices - using SMPC51ANHM3/I in reverse-biased AC paths risks permanent damage due to forward conduction beyond its 1.25 W steady-state rating.
SMPC51ANHM3/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:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-277A (SMPC)
SMPC51ANHM3/I FAQ
1.How can I place an order for SMPC51ANHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMPC51ANHM3/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 SMPC51ANHM3/I reliable?
The price and inventory of SMPC51ANHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMPC51ANHM3/I is usually 5 days.
3.What payment methods are accepted for SMPC51ANHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMPC51ANHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMPC51ANHM3/I?
SMPC51ANHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMPC51ANHM3/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 SMPC51ANHM3/I?
For technical support, including SMPC51ANHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMPC51ANHM3/I requirements.
6.How does Aetrix verify that SMPC51ANHM3/I is sourced from the original manufacturer or authorized distributors?
All SMPC51ANHM3/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 SMPC51ANHM3/I meets industry standards.
7.What is the process for return or replacement of SMPC51ANHM3/I?
All SMPC51ANHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMPC51ANHM3/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 SMPC51ANHM3/I part is unused and in its original packaging.
Return procedure for SMPC51ANHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMPC51ANHM3/I Tags
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