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Vishay General Semiconductor - Diodes Division 1.5SMC51AHM3/H
- Part No.:
- 1.5SMC51AHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC51AHM3/H.pdf
- Description:
- TVS DIODE 43.6VWM 70.1VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:8,632
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Product details
Overview
1.5SMC51AHM3/H from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode designed for robust overvoltage protection in power rails and signal lines. It features a 51 V breakdown voltage (VBR min/max = 48.5–53.6 V at 1 mA), 43.6 V stand-off voltage (VWM), clamps to ≤70.1 V at 21.4 A peak pulse current (10/1000 µs), and delivers 1500 W peak pulse power. It is widely deployed in automotive power supply inputs and industrial sensor interfaces requiring AEC-Q101-qualified surge immunity.
For engineers reviewing the 1.5SMC51AHM3/H datasheet, 1.5SMC51AHM3/H pinout, 1.5SMC51AHM3/H application, or 1.5SMC51AHM3/H equivalent, this page provides verified electrical parameters, package dimensions, clamping behavior under transient stress, thermal derating curves, and direct alternatives with documented voltage and surge capability differences - all critical for ESD/lightning protection design validation and BOM rationalization.
Technical Context
This unidirectional TVS operates as a voltage-clamped shunt protector: when reverse voltage exceeds VWM (43.6 V), it transitions rapidly from high-impedance blocking to low-impedance conduction, diverting surge current away from downstream ICs. Its glass-passivated junction ensures stable leakage (<1 µA at VWM) and repeatable breakdown characteristics across temperature.
Rated for 1500 W peak pulse power (10/1000 µs waveform, 0.01% duty cycle), it sustains 200 A non-repetitive forward surge (8.3 ms half-sine) and operates from –65 °C to +150 °C. The halogen-free, RoHS-compliant HM3 suffix confirms AEC-Q101 qualification and JESD201 Class 2 whisker resistance - essential for automotive under-hood and industrial control applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 48.5 V / 53.6 V at 1 mA - defines precise voltage threshold where clamping initiates; tight tolerance supports accurate system-level overvoltage margining. |
| VWM | 43.6 V - maximum continuous reverse operating voltage; ensures no conduction during normal 36–42 V automotive battery transients. |
| VC @ IPPM | ≤70.1 V at 21.4 A - clamping voltage under full 1500 W surge; determines maximum stress imposed on protected circuitry. |
| PPPM | 1500 W (10/1000 µs) - peak transient energy handling capacity; validates suitability for ISO 7637-2 Pulse 1/2a/5a and IEC 61000-4-5 Level 4 events. |
| IFSM | 200 A (8.3 ms half-sine) - surge current rating for load-dump protection; enables use in 12 V/24 V vehicle power distribution without series fusing. |
| TJ max | +150 °C - maximum junction temperature; supports operation in engine control units and motor drives with minimal heatsinking. |
| RθJA | 75 °C/W - thermal resistance junction-to-ambient on standard 8 mm × 8 mm copper pads; informs PCB layout thermal relief requirements. |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, molded plastic case with matte tin-plated leads. Cathode indicated by black band; anode is unmarked end. Meets UL 94 V-0 flammability rating and J-STD-002 solderability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | High-side connection in unidirectional configuration | Connected to protected line (e.g., +12 V rail); conducts surge current to ground when overvoltage occurs. |
| Anode (unmarked end) | Low-side reference terminal | Typically tied to system ground or low-impedance return path; completes shunt path for transient energy dissipation. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive under-hood applications including powertrain and ADAS ECUs per stress test requirements. |
| 1500 W peak pulse power (10/1000 µs) | Withstands severe lightning-induced surges and inductive switching spikes without degradation in industrial and telecom infrastructure. |
| Glass passivated junction | Ensures stable VBR and low leakage (<1 µA at VWM) over 10+ years of field operation in humid or thermally cycled environments. |
| Halogen-free & RoHS-compliant | Meets EU Directive 2011/65/EU and automotive material compliance standards (e.g., GMW3172, Ford WSS-M99P9999-A1). |
| MSL Level 1 (J-STD-020) | Allows unlimited floor life and reflow up to 260 °C peak - compatible with standard lead-free SMT assembly processes. |
Applications
| Automotive Power Input Protection | Industrial Sensor Signal Line Protection |
|---|---|
Use Scenario: Protecting 12 V/24 V power inputs of engine control modules against load dump (ISO 7637-2 Pulse 5a) and jump-start transients. IC Role / Device Role: Unidirectional shunt TVS placed between battery rail and DC-DC converter input. Use Value: Clamps to ≤70.1 V during 21.4 A surge, preventing damage to downstream LDOs and microcontrollers rated for ≤75 V absolute maximum. |
Use Scenario: Safeguarding analog output lines (e.g., 4–20 mA current loop) of pressure sensors exposed to ESD and cable discharge events. IC Role / Device Role: Bidirectional-capable unidirectional TVS (anode grounded) suppressing both positive and negative transients on signal return paths. Use Value: Low 1 µA leakage at 43.6 V ensures no interference with precision current-loop accuracy; fast response preserves signal integrity during 8 kV contact ESD. |
| Telecom DC Power Feeding | Consumer Appliance Motor Drive Protection |
Use Scenario: Shielding PoE-powered equipment (e.g., IP cameras) from induced surges on 48 V DC feeding lines due to nearby lightning strikes. IC Role / Device Role: Primary shunt protector on DC input before isolation transformer or DC-DC stage. Use Value: 1500 W rating handles IEC 61000-4-5 Combination Wave (10/700 µs) up to Level 4 (4 kV line-earth), maintaining system uptime. |
Use Scenario: Suppressing inductive kickback from brushed DC motors in washing machines and HVAC blowers during commutation. IC Role / Device Role: Unidirectional TVS mounted across motor terminals, cathode to positive supply. Use Value: 200 A 8.3 ms surge rating absorbs repetitive back-EMF spikes without parametric shift; glass passivation prevents moisture-induced failure in high-humidity environments. |
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 | Same 51 V VBR, but lower 400 W PPPM; SMA package (smaller footprint, higher RθJA = 110 °C/W). | Not suitable for ISO 7637-2 Pulse 5a or IEC 61000-4-5 Level 4; limited to consumer-grade 12 V systems with lower surge exposure. | Select when board space is constrained and surge threat level is ≤Level 2; verify thermal margin with reduced copper area. |
| 1.5KE51A | Through-hole TO-204AA (DO-41); identical 51 V VBR, 1500 W PPPM, but larger size and manual assembly requirement. | Used in legacy industrial controls and repair BOMs where SMT rework is impractical; lacks AEC-Q101 qualification. | Choose only for through-hole prototyping or replacement in existing designs; not recommended for new automotive or high-volume SMT production. |
Compared with SMAJ51A and 1.5KE51A, the 1.5SMC51AHM3/H uniquely combines AEC-Q101 qualification, 1500 W surge capability in a compact SMC package, and halogen-free compliance - making it the optimal choice for new automotive and industrial designs requiring validated reliability and automated assembly compatibility.
Availability
1.5SMC51AHM3/H is available at Aetrix Electronics and suitable for automotive power distribution, industrial sensor interface protection, telecom DC feeding, and appliance motor drive circuits requiring stable component supply with guaranteed long-term manufacturability.
Supply support for 1.5SMC51AHM3/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 high-reliability diodes, MOSFETs, optoelectronics, and passive components for automotive, industrial, and computing markets.
The 1.5SMC Series was engineered specifically for high-energy transient suppression in harsh environments - delivering consistent clamping performance, AEC-Q101 validation, and robust thermal design for under-hood and factory-floor applications.
FAQ
What is the clamping voltage of the 1.5SMC51AHM3/H under maximum surge conditions?
The 1.5SMC51AHM3/H clamps to a maximum of 70.1 V when subjected to its rated 21.4 A peak pulse current (10/1000 µs waveform). This value is measured per JEDEC standards and represents the upper limit of voltage seen by protected circuitry during worst-case transient events - critical for ensuring downstream components remain within their absolute maximum ratings.
Is the 1.5SMC51AHM3/H suitable for automotive applications?
Yes, the 1.5SMC51AHM3/H is AEC-Q101 qualified (confirmed by the HM3 suffix), making it suitable for automotive powertrain, body electronics, and ADAS systems. It meets stringent stress testing requirements including temperature cycling, humidity bias, and mechanical shock - validated for under-hood deployment where ambient temperatures reach +125 °C and surge threats include load dump and jump-start transients.
How does the 1.5SMC51AHM3/H differ from the standard 1.5SMC51A variant?
The 1.5SMC51AHM3/H differs from the base 1.5SMC51A in three key ways: it carries the HM3 suffix indicating halogen-free and RoHS-compliant construction, includes AEC-Q101 qualification, and ships in 7-inch tape-and-reel (H code). These enhancements ensure compliance with automotive material specifications and enable use in safety-critical systems where regulatory documentation and long-term supply stability are mandatory.
What is the maximum operating temperature for the 1.5SMC51AHM3/H?
The 1.5SMC51AHM3/H has a maximum junction temperature (TJ) of +150 °C and an operating ambient range of –65 °C to +150 °C. Its thermal resistance junction-to-ambient (RθJA) is 75 °C/W when mounted on 8 mm × 8 mm copper pads - enabling reliable operation in engine control units, motor drives, and other high-temperature industrial environments without additional heatsinking.
Does the 1.5SMC51AHM3/H require a heatsink for standard operation?
No, the 1.5SMC51AHM3/H does not require an external heatsink for transient suppression duty cycles (e.g., 0.01% duty cycle per 10/1000 µs waveform). Its RθJA of 75 °C/W is specified for standard PCB pad layout (0.31" × 0.31" copper per terminal), and continuous power dissipation is limited to 6.5 W - well below typical surge event energy. Heatsinking is unnecessary unless used in high-frequency repetitive surge scenarios outside datasheet conditions.
1.5SMC51AHM3/H 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/H FAQ
1.How can I place an order for 1.5SMC51AHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC51AHM3/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 1.5SMC51AHM3/H reliable?
The price and inventory of 1.5SMC51AHM3/H 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/H is usually 5 days.
3.What payment methods are accepted for 1.5SMC51AHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC51AHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC51AHM3/H?
1.5SMC51AHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC51AHM3/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 1.5SMC51AHM3/H?
For technical support, including 1.5SMC51AHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC51AHM3/H requirements.
6.How does Aetrix verify that 1.5SMC51AHM3/H is sourced from the original manufacturer or authorized distributors?
All 1.5SMC51AHM3/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 1.5SMC51AHM3/H meets industry standards.
7.What is the process for return or replacement of 1.5SMC51AHM3/H?
All 1.5SMC51AHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC51AHM3/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 1.5SMC51AHM3/H part is unused and in its original packaging.
Return procedure for 1.5SMC51AHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5SMC51AHM3/H Tags
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