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Vishay General Semiconductor - Diodes Division 1.5SMC51CAHM3_A/I
- Part No.:
- 1.5SMC51CAHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC51CAHM3_A/I.pdf
- Description:
- TVS DIODE 43.6VWM 70.1VC DO214AB
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
1.5SMC51CAHM3_A/I from Vishay General Semiconductor is a bidirectional 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), 70.1 V maximum clamping voltage (VC) at 21.4 A peak pulse current (IPPM), and 1500 W peak pulse power capability with a 10/1000 µs waveform - used to safeguard automotive sensor signal lines against lightning-induced transients and inductive switching spikes.
For engineers reviewing the 1.5SMC51CAHM3_A/I datasheet, 1.5SMC51CAHM3_A/I pinout, 1.5SMC51CAHM3_A/I application, or 1.5SMC51CAHM3_A/I equivalent, this device serves as a halogen-free, RoHS-compliant, AEC-Q101-qualified TVS for bidirectional transient suppression in harsh environments where reliability under repetitive surges and thermal stability up to +150 °C are critical selection criteria.
Technical Context
The 1.5SMC51CAHM3_A/I operates as a bidirectional avalanche diode, symmetrically clamping voltage transients in both polarities without polarity marking. Its glass-passivated junction enables fast response time (<1 ns) and low incremental surge resistance, ensuring effective suppression of ESD, EFT, and surge events per IEC 61000-4-2/4-4/4-5.
Rated for 1500 W peak pulse power (10/1000 µs), it delivers 21.4 A IPPM while maintaining VC ≤ 70.1 V, and supports continuous power dissipation of 6.5 W on infinite heatsink at TA = 50 °C. Thermal resistance is RθJA = 75 °C/W and RθJL = 15 °C/W, enabling robust operation in compact automotive and industrial PCB layouts.
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 threshold for bidirectional clamping |
| VWM | 43.6 V - maximum steady-state reverse voltage before leakage exceeds 1.0 µA, setting safe operating margin below VBR |
| VC @ IPPM | 70.1 V at 21.4 A - clamped voltage during worst-case 10/1000 µs surge, directly limiting stress on downstream ICs |
| PPPM | 1500 W - peak transient energy absorption capacity, enabling protection against IEC 61000-4-5 Level 4 (4 kV) surges |
| TJ max. | +150 °C - junction temperature limit supporting operation in under-hood automotive environments |
| Package | SMC (DO-214AB) - industry-standard surface-mount outline with 8.0 mm × 8.0 mm copper pad requirement for thermal performance |
| AEC-Q101 | Qualified - validated for automotive-grade reliability including temperature cycling, HTRB, and surge endurance |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, bidirectional configuration with no polarity marking. Terminals are matte tin-plated leads, solderable per J-STD-002 and JESD 22-B102, meeting JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point in forward bias; symmetrical with cathode in bidirectional operation | Enables clamping in both voltage polarities - no external polarity assignment required |
| Cathode | Current exit point in forward bias; functionally identical to anode for bidirectional devices | Eliminates need for orientation-aware placement; simplifies automated assembly |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Provides symmetrical transient suppression without polarity dependency - ideal for AC-coupled or floating signal lines |
| 1500 W peak pulse power | Withstands repeated 10/1000 µs surges up to 21.4 A while holding VC ≤ 70.1 V - protects CAN, LIN, and sensor interfaces |
| AEC-Q101 qualification | Validated for automotive applications including engine control, ADAS sensors, and body electronics requiring long-term field reliability |
| Halogen-free & RoHS-compliant | Meets automotive environmental compliance mandates (e.g., ELV, REACH) and supports lead-free reflow profiles up to 260 °C peak |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients - critical for protecting low-voltage microcontrollers and analog front-ends |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
|
Use Scenario: Protecting analog output lines of pressure/temperature sensors in engine bay modules exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Bidirectional TVS clamp placed at connector interface to shunt transient energy before reaching ADC input or signal conditioner IC. Use Value: Maintains signal integrity by limiting transient voltage to ≤70.1 V during 10/1000 µs surges up to 1500 W, preventing latch-up or damage to 3.3 V/5 V sensor interface ICs. |
Use Scenario: Safeguarding 24 V digital input channels in programmable logic controllers subjected to inductive kickback from solenoid/relay coils. IC Role / Device Role / Timing Role: Fast-response TVS placed across input terminals to clamp reverse-polarity transients and EFT bursts before reaching optocoupler or Schmitt trigger input stage. Use Value: Enables reliable operation under IEC 61000-4-4 (EFT) and IEC 61000-4-5 (surge) immunity testing with no degradation after 1000+ surge cycles. |
| Telecom Line Interface | Consumer Power Adapter EMI Filtering |
|
Use Scenario: Suppressing lightning-induced surges on RS-485 data lines in outdoor telecom base stations. IC Role / Device Role / Timing Role: Bidirectional TVS integrated into common-mode choke filter network to absorb differential-mode transients before transceiver ICs. Use Value: Clamps line-to-line transients to <70 V within <1 ns, preserving signal eye diagram integrity and meeting GR-1089-CORE Level 3 requirements. |
Use Scenario: Protecting secondary-side DC outputs of wall adapters against user-induced plug/unplug transients and capacitor discharge spikes. IC Role / Device Role / Timing Role: Final-stage TVS on 5 V/12 V output rail to prevent overvoltage damage to connected USB peripherals or IoT modules. Use Value: Absorbs up to 1500 W peak energy without failure, eliminating need for redundant Zener or crowbar circuits in cost-sensitive consumer designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ51CA | Same VBR range (48.5–53.6 V) and VC (70.1 V), but lower PPPM = 600 W in SMB (DO-214AA) package | Limited to lower-energy transients (IEC 61000-4-5 Level 2); unsuitable for automotive load-dump scenarios | Select when board space is constrained and surge threat level is moderate (e.g., indoor consumer electronics) |
| 1.5KE51CA | Through-hole TO-218 package, same electrical specs, but higher thermal mass and manual assembly requirement | Preferred for prototyping or legacy through-hole designs; not suitable for high-volume SMT production | Choose only if existing PCB layout lacks SMT pads or requires mechanical robustness in vibration-prone environments |
Compared with SMBJ51CA and 1.5KE51CA, the 1.5SMC51CAHM3_A/I uniquely combines AEC-Q101 qualification, halogen-free construction, and 1500 W SMT capability - making it the only option qualified for volume automotive production where regulatory compliance, thermal performance, and automated assembly are mandatory.
Availability
1.5SMC51CAHM3_A/I is available at Aetrix Electronics and suitable for automotive sensor protection, industrial PLC I/O hardening, and telecom line interface applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for 1.5SMC51CAHM3_A/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, MOSFETs, and passive components for automotive, industrial, and computing markets.
The 1.5SMC Series was engineered specifically for high-power, surface-mount transient suppression in automotive and industrial environments - emphasizing AEC-Q101 qualification, thermal robustness, and bidirectional surge handling in compact SMC packaging.
FAQ
What is the clamping voltage of the 1.5SMC51CAHM3_A/I under a 10/1000 µs surge?
The 1.5SMC51CAHM3_A/I has a maximum clamping voltage (VC) of 70.1 V at 21.4 A peak pulse current (IPPM) under a 10/1000 µs waveform. This value is measured per standard test conditions and ensures downstream circuitry remains protected below critical voltage thresholds. The 1.5SMC51CAHM3_A/I achieves this clamping performance while maintaining low incremental surge resistance and fast response time.
Is the 1.5SMC51CAHM3_A/I suitable for automotive applications?
Yes, the 1.5SMC51CAHM3_A/I is AEC-Q101 qualified and manufactured with halogen-free, RoHS-compliant materials - explicitly intended for automotive use. It meets stringent requirements for temperature cycling, surge endurance, and long-term reliability in engine control units, ADAS sensors, and body electronics. The 1.5SMC51CAHM3_A/I is designated with the HM3 suffix to indicate its automotive-grade qualification status.
What does the "CA" suffix mean in 1.5SMC51CAHM3_A/I?
The "CA" suffix in 1.5SMC51CAHM3_A/I indicates a bidirectional configuration - meaning the device provides symmetrical transient voltage suppression in both polarities, with no cathode band marking. This distinguishes it from unidirectional variants (e.g., "A" suffix) and makes the 1.5SMC51CAHM3_A/I ideal for AC-coupled, floating, or polarity-agnostic signal lines such as RS-485, CAN, or sensor differential pairs.
What is the standoff voltage (VWM) of the 1.5SMC51CAHM3_A/I?
The standoff voltage (VWM) of the 1.5SMC51CAHM3_A/I is 43.6 V - the maximum continuous reverse voltage that can be applied without exceeding 1.0 µA leakage current. This provides a safe operating margin below the minimum breakdown voltage (48.5 V), ensuring stable blocking behavior during normal operation while allowing rapid avalanche conduction during transients. The 1.5SMC51CAHM3_A/I maintains this VWM across its full operating temperature range.
Does the 1.5SMC51CAHM3_A/I require special PCB layout considerations?
Yes - the 1.5SMC51CAHM3_A/I must be mounted on minimum recommended copper pad areas of 0.31" × 0.31" (8.0 mm × 8.0 mm) per terminal to achieve rated thermal performance and 1500 W pulse power capability. Reduced pad size degrades heat dissipation and lowers IPPM derating. The 1.5SMC51CAHM3_A/I also benefits from short, low-inductance traces to the protected node to preserve clamping speed and effectiveness.
1.5SMC51CAHM3_A/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:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- 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)
1.5SMC51CAHM3_A/I FAQ
1.How can I place an order for 1.5SMC51CAHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC51CAHM3_A/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 1.5SMC51CAHM3_A/I reliable?
The price and inventory of 1.5SMC51CAHM3_A/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5SMC51CAHM3_A/I is usually 5 days.
3.What payment methods are accepted for 1.5SMC51CAHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC51CAHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC51CAHM3_A/I?
1.5SMC51CAHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC51CAHM3_A/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 1.5SMC51CAHM3_A/I?
For technical support, including 1.5SMC51CAHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC51CAHM3_A/I requirements.
6.How does Aetrix verify that 1.5SMC51CAHM3_A/I is sourced from the original manufacturer or authorized distributors?
All 1.5SMC51CAHM3_A/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 1.5SMC51CAHM3_A/I meets industry standards.
7.What is the process for return or replacement of 1.5SMC51CAHM3_A/I?
All 1.5SMC51CAHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC51CAHM3_A/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 1.5SMC51CAHM3_A/I part is unused and in its original packaging.
Return procedure for 1.5SMC51CAHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5SMC51CAHM3_A/I Tags
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