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Vishay General Semiconductor - Diodes Division SMPC51ANHM3/H
- Part No.:
- SMPC51ANHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- TO-277, 3-PowerDFN
- Datasheet:
-
SMPC51ANHM3/H.pdf
- Description:
- TVS DIODE 51VWM 82.4VC TO277A
- Quantity:
- Payment:
- Shipping:
Inventory:8,201
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Product details
Overview
SMPC51ANHM3/H 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 V stand-off voltage (VWM), 82.4 V maximum clamping voltage at 18.2 A peak pulse current, 1500 W peak pulse power rating (10/1000 μs), and AEC-Q101 qualification for automotive applications.
For engineers reviewing the SMPC51ANHM3/H datasheet, SMPC51ANHM3/H pinout, SMPC51ANHM3/H application, or SMPC51ANHM3/H equivalent, this device is selected for robust overvoltage protection in automotive ECUs, industrial sensor interfaces, and power supply input stages where fast response (<1 ns), low clamping ratio, and MSL Level 1 reflow compatibility are critical.
Technical Context
The SMPC51ANHM3/H operates as a unidirectional avalanche diode with a specified breakdown voltage range of 56.7–62.7 V at 1 mA test current. Its clamping behavior is defined under standardized 10/1000 μs surge waveforms, delivering consistent voltage limiting up to 18.2 A peak pulse current while maintaining thermal stability up to 150 °C junction temperature.
Mounted on FR4 PCB with 2 oz copper, it exhibits a typical junction-to-ambient thermal resistance of 85 °C/W and junction-to-mount resistance of 2.5 °C/W. The device uses matte tin-plated leads compliant with J-STD-002 and JESD 22-B102, and passes JESD 201 Class 2 whisker testing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 51.0 V - Maximum continuous reverse operating voltage before significant leakage; defines safe DC rail protection threshold. |
| VBR min/max | 56.7 V / 62.7 V - Breakdown voltage range at 1 mA; ensures reliable avalanche initiation across process variation. |
| VC @ IPPM | 82.4 V - Clamped voltage at 18.2 A peak pulse current; determines protected circuit's maximum transient exposure. |
| PPPM | 1500 W - Peak pulse power handling (10/1000 μs); supports IEC 61000-4-5 Level 4 surge immunity compliance. |
| TJ max | +150 °C - Maximum junction temperature; enables operation in under-hood automotive environments. |
| Package | SMPC (TO-277A) - Surface-mount, 3-terminal, low-profile (1.1 mm height) package optimized for automated placement and thermal performance. |
| AEC-Q101 | Qualified - Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD per AEC standard. |
Pinout & Package
SMPC51ANHM3/H uses the SMPC (TO-277A) package: a 3-terminal surface-mount case with anode-anode-cathode configuration. The cathode band denotes the common cathode terminal; both anodes are internally tied and electrically identical.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode 1 | Input node for unidirectional surge path | Connected to protected line (e.g., battery rail); forms one half of dual-anode structure for symmetric layout routing. |
| Anode 2 | Input node for unidirectional surge path | Electrically identical to Anode 1; enables balanced PCB trace routing and improved current sharing during surge events. |
| Cathode | Common return path to ground or low-side reference | Single cathode terminal carries full surge current; must be routed to low-inductance ground plane for optimal clamping performance. |
Key Features
| Feature | Design Value |
|---|---|
| Unidirectional clamping | Enables DC-biased protection without forward conduction during normal operation; ideal for positive-rail applications. |
| AEC-Q101 qualification | Validates reliability for automotive powertrain, body control, and ADAS modules requiring long-term field operation at elevated temperatures. |
| Low profile (1.1 mm height) | Reduces board stack height and improves airflow in dense automotive modules; compatible with low-clearance enclosures. |
| MSL Level 1 (260 °C peak) | Supports standard lead-free reflow without preconditioning; eliminates moisture-related popcorning risk during assembly. |
| Halogen-free & RoHS-compliant | Fulfills EU environmental directives and OEM sustainability requirements for vehicle electronics manufacturing. |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input Protection |
|---|---|
Use Scenario: Protecting 12 V supply inputs in BCMs against load dump and inductive switching transients from relays and solenoids. IC Role / Device Role / Timing Role: Primary TVS clamp on main power rail upstream of LDOs and microcontrollers. Use Value: Limits transient voltage to ≤82.4 V during 18.2 A surges, preventing latch-up or permanent damage to downstream 5 V/3.3 V logic. |
Use Scenario: Safeguarding 24 V digital input channels in programmable logic controllers exposed to field wiring surges. IC Role / Device Role / Timing Role: Front-end transient suppressor before optocoupler or Schmitt-trigger input stage. Use Value: Responds in <1 ns to clamp fast-rising transients, preserving signal integrity and enabling reliable edge detection. |
| Automotive Camera Module Power Rail | Telecom PoE Interface Protection |
Use Scenario: Securing 5 V or 12 V power to rear-view or surround-view camera modules mounted near motors and antennas. IC Role / Device Role / Timing Role: Unidirectional TVS placed directly at connector entry point before EMI filter and DC/DC converter. Use Value: Withstands repeated 1500 W surges while maintaining low leakage (<1 μA at 51 V), avoiding false resets or image noise. |
Use Scenario: Protecting 48 V PoE (IEEE 802.3af/at) data line interfaces from lightning-induced surges on outdoor telecom equipment. IC Role / Device Role / Timing Role: Secondary-level TVS after primary gas discharge tube, handling residual fast transients. Use Value: Delivers precise 82.4 V clamping at 18.2 A, ensuring Ethernet PHY ICs remain within absolute maximum ratings during surge 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-HF | Same VWM (51 V) and VC (82.4 V), but lower PPPM (400 W) and SMA package (higher RθJA ≈ 150 °C/W). | Limited to lower-energy transients; unsuitable for automotive load dump or IEC 61000-4-5 Level 4. | Select when cost sensitivity outweighs surge energy requirement and board space allows larger thermal pad. |
| SMCJ51A-Q | Same VWM and higher PPPM (1500 W), but SMC package (2.3 mm height) and no AEC-Q101 certification. | Acceptable for industrial use but not qualified for automotive production; requires additional reliability validation. | Choose for non-automotive 1500 W protection where AEC-Q101 is not mandated and height tolerance >1.1 mm. |
Compared with SMAJ51A-HF and SMCJ51A-Q, the SMPC51ANHM3/H uniquely combines AEC-Q101 qualification, 1500 W surge capability, and ultra-low 1.1 mm profile-making it the only option validated for space-constrained, high-reliability automotive power rail protection without thermal derating penalties.
Availability
SMPC51ANHM3/H is available at Aetrix Electronics and suitable for automotive electronic control units, industrial programmable logic controllers, and telecom power-over-Ethernet interfaces requiring stable component supply across multi-year production cycles.
Supply support for SMPC51ANHM3/H 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 reliability and application-specific performance.
The SMPC series belongs to Vishay's TRANSZORB® TVS platform, engineered specifically for high-energy, low-clamping transient protection in automotive, industrial, and communications infrastructure where failure modes must be rigorously controlled.
FAQ
What is the exact breakdown voltage range for SMPC51ANHM3/H?
The SMPC51ANHM3/H has a guaranteed breakdown voltage (VBR) range of 56.7 V to 62.7 V at 1 mA test current, measured per ANSI/IEEE C62.35 standards. This range ensures consistent avalanche initiation across manufacturing lots and temperature extremes, and is verified in the official Vishay datasheet (Document Number: 89116, Rev. 17-Sep-2021). The SMPC51ANHM3/H maintains this specification under all rated operating conditions.
Is SMPC51ANHM3/H suitable for 12 V automotive battery rail protection?
Yes, the SMPC51ANHM3/H is explicitly qualified for automotive use via AEC-Q101 and designed for 12 V system protection. Its 51 V stand-off voltage provides adequate margin above nominal 12 V and typical 14 V alternator output, while its 82.4 V clamping voltage stays well below the 100 V+ absolute maximum ratings of most downstream regulators and MCUs. The SMPC51ANHM3/H is commonly deployed in BCMs and ADAS ECUs for this purpose.
Does SMPC51ANHM3/H have a bidirectional variant?
No, SMPC51ANHM3/H is strictly unidirectional. Vishay offers separate part numbers for bidirectional variants (e.g., SMPC51CANHM3/H), which feature symmetrical breakdown in both polarities. The "A" suffix in SMPC51ANHM3/H denotes unidirectional polarity, confirmed by the cathode-band marking and electrical characteristics table showing only reverse-direction parameters. Using SMPC51ANHM3/H in AC or bipolar signal paths would result in forward conduction and failure.
What is the thermal resistance of SMPC51ANHM3/H when mounted on standard FR4?
The SMPC51ANHM3/H exhibits a typical junction-to-ambient thermal resistance (RθJA) of 85 °C/W when mounted on a standard FR4 PCB with 2 oz copper and the recommended footprint. Its junction-to-mount resistance (RθJM) is 2.5 °C/W, indicating efficient heat transfer to the PCB ground plane. These values are measured per JEDEC® 51-2A and 51-14 standards and are critical for calculating safe power dissipation limits in real-world layouts. The SMPC51ANHM3/H relies on proper copper pour design to achieve these ratings.
Can SMPC51ANHM3/H replace SMAJ51A in existing designs?
No direct replacement is assured. While both share 51 V VWM, the SMPC51ANHM3/H has a different 3-terminal SMPC (TO-277A) package versus SMAJ51A's 2-terminal SMA package, requiring PCB layout revision. Additionally, SMPC51ANHM3/H delivers 1500 W surge capability versus SMAJ51A's 400 W, and includes AEC-Q101 qualification absent in SMAJ51A. Migration to SMPC51ANHM3/H demands full electrical and thermal revalidation-not just footprint adaptation.
SMPC51ANHM3/H 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/H FAQ
1.How can I place an order for SMPC51ANHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMPC51ANHM3/H 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/H reliable?
The price and inventory of SMPC51ANHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMPC51ANHM3/H is usually 5 days.
3.What payment methods are accepted for SMPC51ANHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMPC51ANHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMPC51ANHM3/H?
SMPC51ANHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMPC51ANHM3/H 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/H?
For technical support, including SMPC51ANHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMPC51ANHM3/H requirements.
6.How does Aetrix verify that SMPC51ANHM3/H is sourced from the original manufacturer or authorized distributors?
All SMPC51ANHM3/H 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/H meets industry standards.
7.What is the process for return or replacement of SMPC51ANHM3/H?
All SMPC51ANHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMPC51ANHM3/H, 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/H part is unused and in its original packaging.
Return procedure for SMPC51ANHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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