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Vishay General Semiconductor - Diodes Division 1.5SMC51AHM3/I
- Part No.:
- 1.5SMC51AHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC51AHM3/I.pdf
- Description:
- TVS DIODE 43.6VWM 70.1VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:4,068
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Product details
Overview
1.5SMC51AHM3/I from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in the SMC (DO-214AB) package, designed for high-energy surge protection. It features a 51 V breakdown voltage (VBR = 48.5–53.6 V at IT = 1.0 mA), 43.6 V stand-off voltage (VWM), and clamps transients to ≤70.1 V at 21.4 A peak pulse current (IPPM) under 10/1000 µs waveform - used to protect automotive sensor signal lines, power supply rails, and MOSFET gate drivers against lightning-induced surges and inductive switching spikes.
For engineers reviewing the 1.5SMC51AHM3/I datasheet, 1.5SMC51AHM3/I pinout, 1.5SMC51AHM3/I application, or 1.5SMC51AHM3/I equivalent, this page delivers verified electrical parameters, thermal derating behavior, AEC-Q101 qualification status, halogen-free RoHS compliance, and real-world design implications for transient suppression in automotive-grade embedded systems.
Technical Context
The 1.5SMC51AHM3/I operates as a unidirectional avalanche diode with glass-passivated junction, delivering fast response (<1 ns) and low incremental surge resistance to clamp voltage transients before downstream ICs are damaged. Its 1500 W peak pulse power rating (10/1000 µs) and 200 A IFSM (8.3 ms half-sine) support robust protection in harsh environments.
Thermal performance is defined by RθJA = 75 °C/W (on recommended 8.0 mm × 8.0 mm copper pads) and RθJL = 15 °C/W, enabling stable operation up to TJ = +150 °C. The device is rated for -65 °C to +150 °C junction/storage temperature range and meets MSL Level 1 (260 °C reflow peak).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 48.5 V / 53.6 V at IT = 1.0 mA - defines precise avalanche onset window for reliable clamping threshold control |
| VWM | 43.6 V - maximum continuous reverse operating voltage before leakage exceeds 1.0 µA; sets safe DC bias margin |
| VC @ IPPM | ≤70.1 V at 21.4 A (10/1000 µs) - actual clamped voltage seen by protected circuit during worst-case surge |
| PPPM | 1500 W - peak transient energy absorption capability without failure; enables single-device protection for 12 V/24 V automotive bus |
| IFSM | 200 A (8.3 ms half-sine) - surge current handling for repetitive load dump events in vehicle power systems |
| TJ max. | +150 °C - supports under-hood deployment in engine control units and ADAS modules without thermal derating penalties |
| Package | SMC (DO-214AB) - industry-standard surface-mount outline with 0.320" × 0.246" footprint and matte tin-plated leads per J-STD-002 |
Pinout & Package
Package: SMC (DO-214AB), molded case with UL 94 V-0 flammability rating; cathode indicated by band on body; terminals are matte tin-plated and whisker-tested per JESD 201 Class 2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point in forward conduction mode | Connected to ground or low-side reference in unidirectional TVS configuration; enables clamping of positive transients on cathode-connected line |
| Cathode | Current exit point in forward conduction; avalanche node in reverse bias | Connected to protected signal/power line; absorbs and shunts surge current to ground when VLINE exceeds VWM |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics per stress test requirements - enables use in safety-critical ECUs without additional qualification effort |
| Halogen-free & RoHS-compliant (HM3 suffix) | Meets EU Directive 2011/65/EU and IPC-1752A material declarations - supports green manufacturing and export compliance |
| 1500 W peak pulse power (10/1000 µs) | Single-device protection against ISO 7637-2 Pulse 5a (load dump) and IEC 61000-4-5 Level 4 surges without parallel staging |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients - critical for protecting 3.3 V/5 V logic interfaces downstream |
| MSL Level 1 (260 °C peak) | Compatible with standard lead-free reflow profiles without moisture sensitivity concerns - eliminates bake requirements pre-assembly |
Applications
| Automotive Sensor Protection | Industrial Power Supply Input |
|---|---|
|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor outputs (e.g., pressure, temperature) from ESD and load dump coupling in vehicle cabins. IC Role / Device Role / Timing Role: Unidirectional TVS placed between signal line and chassis ground, clamping transients within nanoseconds. Use Value: Prevents latch-up or permanent damage to 5 V tolerant transceivers by limiting voltage to ≤70.1 V during 21.4 A surges - maintaining communication integrity across temperature extremes. |
Use Scenario: Safeguarding 24 V DC input stage of PLC I/O modules against induced surges from relay coil switching and motor drive noise. IC Role / Device Role / Timing Role: Primary overvoltage clamp on main power rail upstream of DC/DC converter input. Use Value: Absorbs 1500 W transient energy without degradation, enabling compact design with no external heat sinking required on 8 mm × 8 mm copper pads. |
| Motor Drive Gate Protection | Telecom Line Interface |
|
Use Scenario: Shielding high-side N-channel MOSFET gate drivers in BLDC inverters from Miller-induced voltage spikes during switching transitions. IC Role / Device Role / Timing Role: Fast-response unidirectional suppressor tied between gate and source, referenced to local ground plane. Use Value: Clamps gate-source voltage to <70.1 V before oxide breakdown occurs, preserving driver reliability under repeated 200 A surge conditions. |
Use Scenario: Front-end surge suppression on Ethernet PHY power rails (e.g., 3.3 V bias for magnetics) in outdoor telecom equipment exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Secondary-level TVS after gas discharge tube (GDT), providing low-clamping precision for sensitive PHY ICs. Use Value: Delivers sub-70 V clamping at 21.4 A while maintaining <1.0 µA leakage at 43.6 V - preventing false triggering and standby current drift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ51A-E3/52T | Same VBR range (48.5–53.6 V), but SMB package (smaller footprint, lower PPPM = 600 W) | Limited to lower-energy transients (e.g., ESD-only); unsuitable for load dump or IEC 61000-4-5 Level 4 | Select when board space is constrained and surge threat level is limited to ±8 kV contact ESD per IEC 61000-4-2 |
| 1.5KE51A | Through-hole DO-201 package; identical electrical specs but higher RθJA (~100 °C/W) and no AEC-Q101 qualification | Not suitable for automated SMT production or automotive under-hood use; requires wave soldering | Choose only for legacy through-hole designs or non-automotive industrial prototypes where reflow compatibility is not required |
Compared with SMBJ51A-E3/52T and 1.5KE51A, the 1.5SMC51AHM3/I uniquely combines AEC-Q101 qualification, halogen-free compliance, 1500 W surge capacity, and SMC surface-mount compatibility - making it the only option validated for volume automotive production with zero layout compromise.
Availability
1.5SMC51AHM3/I is available at Aetrix Electronics and suitable for automotive sensor protection, industrial power supply input stages, motor drive gate circuits, and telecom line interface designs requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for 1.5SMC51AHM3/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 high-reliability diodes, rectifiers, and protection devices for demanding industrial and automotive applications.
The 1.5SMC Series was engineered specifically for surface-mount transient suppression in harsh environments - prioritizing high peak power, low clamping voltage, and automotive-grade reliability in compact SMC packaging.
FAQ
What is the clamping voltage of the 1.5SMC51AHM3/I at its rated peak pulse current?
The 1.5SMC51AHM3/I clamps to a maximum of 70.1 V at its rated peak pulse current of 21.4 A under the standard 10/1000 µs waveform. This value is measured at TA = 25 °C on recommended 8.0 mm × 8.0 mm copper pads and represents the upper limit of voltage imposed on the protected circuit during worst-case surge events - critical for ensuring downstream ICs remain within absolute maximum ratings.
Is the 1.5SMC51AHM3/I qualified for automotive applications?
Yes, the 1.5SMC51AHM3/I is AEC-Q101 qualified, as confirmed by Vishay's ordering code suffix "HM3" and documentation in the 1.5SMC series datasheet (Document Number 88303). This qualification covers stress tests including high-temperature operating life, temperature cycling, and ESD - validating its suitability for engine control units, ADAS sensors, and other automotive electronic modules requiring long-term reliability under thermal and mechanical stress.
What does the "HM3" suffix mean in 1.5SMC51AHM3/I?
The "HM3" suffix in 1.5SMC51AHM3/I indicates halogen-free, RoHS-compliant construction with AEC-Q101 qualification. Specifically, "H" denotes halogen-free molding compound, "M3" confirms RoHS compliance and JESD 201 Class 2 whisker resistance, and the "/I" denotes 3500-unit tape-and-reel packaging on 13-inch reels - distinguishing it from "/H" (850-unit reels) and non-automotive "E3" or "M3" variants.
How does the thermal resistance of the 1.5SMC51AHM3/I affect PCB layout?
The 1.5SMC51AHM3/I has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on minimum recommended 8.0 mm × 8.0 mm copper pads per terminal. To maintain TJ ≤ 150 °C under full 1500 W pulse loading, designers must allocate sufficient copper area and avoid thermal isolation - undersized pads increase RθJA, risking premature thermal runaway during repetitive surge events.
Can the 1.5SMC51AHM3/I be used in bidirectional configurations?
No, the 1.5SMC51AHM3/I is a unidirectional TVS diode, as indicated by the "A" suffix and absence of "CA" in its part number. Bidirectional operation requires the "CA" variant (e.g., 1.5SMC51CAHM3/I), which provides symmetrical clamping in both polarities. Using the unidirectional 1.5SMC51AHM3/I in bidirectional signal paths risks forward conduction and potential damage during negative transients.
1.5SMC51AHM3/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- 1.5SMC, TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 43.6V
- Voltage - Breakdown (Min):
- 48.5V
- Voltage - Clamping (Max) @ Ipp:
- 70.1V
- Current - Peak Pulse (10/1000µs):
- 21.4A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
1.5SMC51AHM3/I FAQ
1.How can I place an order for 1.5SMC51AHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC51AHM3/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 1.5SMC51AHM3/I reliable?
The price and inventory of 1.5SMC51AHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5SMC51AHM3/I is usually 5 days.
3.What payment methods are accepted for 1.5SMC51AHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC51AHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC51AHM3/I?
1.5SMC51AHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC51AHM3/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 1.5SMC51AHM3/I?
For technical support, including 1.5SMC51AHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC51AHM3/I requirements.
6.How does Aetrix verify that 1.5SMC51AHM3/I is sourced from the original manufacturer or authorized distributors?
All 1.5SMC51AHM3/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 1.5SMC51AHM3/I meets industry standards.
7.What is the process for return or replacement of 1.5SMC51AHM3/I?
All 1.5SMC51AHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC51AHM3/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 1.5SMC51AHM3/I part is unused and in its original packaging.
Return procedure for 1.5SMC51AHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5SMC51AHM3/I Tags
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DESD3V3E1BL-7B
Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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