My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SM5S51CAHM3/I
- Part No.:
- SM5S51CAHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
SM5S51CAHM3/I.pdf
- Description:
- 3600 W BI-DIRECTIONAL TVS IS DO-
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SM5S51CAHM3/I from Vishay General Semiconductor is a bidirectional surface-mount PAR® transient voltage suppressor (TVS) designed for automotive load dump protection in 12 V/24 V systems. It features a 51.0 V stand-off voltage (VWM), 56.7–62.7 V breakdown range (VBR), 82.4 V maximum clamping voltage (VC) at 43.7 A peak pulse current, and 3600 W peak pulse power (10/1000 µs). Its DO-218AC package supports high-reliability under TJ = 175 °C operation.
For engineers reviewing the SM5S51CAHM3/I datasheet, SM5S51CAHM3/I pinout, SM5S51CAHM3/I application, or SM5S51CAHM3/I equivalent, this device is selected for ISO 7637-2/ISO 16750-2-compliant surge suppression in engine control units, body control modules, and ADAS power rails where low leakage (<10 µA at VWM), AEC-Q101 qualification, and MSL Level 1 reflow compatibility are mandatory.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector triggered by overvoltage transients. Its bidirectional structure enables symmetrical clamping without polarity sensitivity, and its silicon avalanche junction delivers stable breakdown with ±5% tolerance ('A' grade) across -55 °C to +175 °C.
The DO-218AC package integrates a metal heatsink terminal for low thermal resistance (RθJM = 0.45 °C/W), enabling high-power dissipation without external heatsinking. It meets JESD201 Class 2 whisker resistance and UL 94 V-0 flammability requirements, supporting automated SMT assembly at 245 °C peak reflow.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 51.0 V - Reverse stand-off voltage; defines maximum continuous operating voltage before conduction begins. |
| VBR min/max | 56.7 V / 62.7 V - Breakdown voltage range at 5 mA test current; ensures predictable turn-on within tight tolerance. |
| VC @ IPPM | 82.4 V at 43.7 A - Clamping voltage during 10/1000 µs surge; limits downstream IC stress to safe levels. |
| PPPM (10/1000 µs) | 3600 W - Peak pulse power handling; sustains automotive load dump surges per ISO 7637-2 Pulse 5a. |
| ID @ VWM | <10 µA at 25 °C - Low reverse leakage preserves battery drain budget in always-on vehicle modules. |
| TJ max | +175 °C - Maximum junction temperature; enables placement near hot engine compartments or power stages. |
| Package | DO-218AC - Surface-mount package with integrated metal heatsink terminal; optimized for thermal performance and AEC-Q101 reliability. |
Pinout & Package
SM5S51CAHM3/I uses the DO-218AC package: a two-terminal, bidirectional surface-mount device with no polarity marking. Terminal 1 is the anode-side lead; Terminal 2 is the cathode-side metal heatsink tab - both electrically active and symmetric due to bidirectional design. The metal tab provides primary thermal path to PCB copper.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal 1 (Lead) | Anode-side connection | Standard solderable matte tin-plated lead; forms one half of symmetrical TVS junction. |
| Terminal 2 (Metal Heatsink Tab) | Cathode-side connection & thermal interface | Exposed metal tab serving as second terminal and primary heat conduction path to PCB thermal pad. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per stress test plan. |
| MSL Level 1 (245 °C peak) | Compatible with standard lead-free reflow profiles without moisture sensitivity concerns or baking requirement. |
| Halogen-free & RoHS-compliant (M3) | Meets global environmental regulations and eliminates corrosive halogen emissions during end-of-life processing. |
| ISO 7637-2 & ISO 16750-2 compliant | Tested to withstand load dump (Pulse 5a), jump start, and alternator ripple transients in 12 V/24 V vehicle networks. |
| Junction-to-mount thermal resistance | RθJM = 0.45 °C/W - Enables efficient heat transfer from junction to PCB thermal pad, critical for sustained surge duty. |
Applications
| Engine Control Unit (ECU) Power Input | Body Control Module (BCM) CAN Bus Protection |
|---|---|
Use Scenario: Protects microcontroller and power management ICs from alternator load dump transients during battery disconnect events. IC Role / Device Role: Shunt-type transient suppressor placed directly at 12 V input rail before DC/DC converter. Use Value: Clamps 120 V/3600 W load dump spikes to ≤82.4 V, preventing damage to downstream 5 V/3.3 V logic supplies. |
Use Scenario: Shields high-speed CAN transceivers from coupled transients on shared power and ground lines. IC Role / Device Role: Bidirectional rail clamp on VCC line feeding isolated CAN interface ICs. Use Value: Maintains signal integrity by limiting supply rail excursions during ISO 7637-2 Pulse 1/2b events without adding capacitance to data lines. |
| ADAS Camera Power Rail | Electric Power Steering (EPS) Motor Driver |
Use Scenario: Secures image sensor and ISP power inputs against ignition-induced switching noise and battery reversal surges. IC Role / Device Role: Primary overvoltage clamp on 5 V or 3.3 V regulated output of buck converter supplying camera module. Use Value: Delivers <10 µA leakage at 5 V to preserve low-power sleep mode current budgets while clamping fast 100 ns transients. |
Use Scenario: Guards gate driver ICs and MCU I/O from inductive kickback generated by brushed/BLDC motor commutation. IC Role / Device Role: High-energy TVS on 12 V auxiliary supply feeding motor control logic and sensors. Use Value: Absorbs 2400 W (10/10,000 µs) surges common in EPS systems, extending lifetime of sensitive analog front-end components. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ51CA | Lower PPPM (400 W vs. 3600 W); SMA package (RθJA ≈ 110 °C/W vs. 65 °C/W); no AEC-Q101 qualification. | Restricted to low-energy consumer or industrial I/O protection; unsuitable for automotive load dump. | Select only for cost-sensitive non-automotive designs with sub-500 W surge requirements. |
| TPSMD51CA | Same DO-218AC package and 3600 W rating; slightly higher VC (85 V vs. 82.4 V); identical AEC-Q101 and MSL Level 1 status. | Drop-in replacement in most layouts; minor clamping voltage trade-off acceptable for less sensitive 5 V rail protection. | Preferred when tighter VBR tolerance (±3%) or alternate sourcing is required; verify VC margin in final design. |
Compared with SMAJ51CA and TPSMD51CA, SM5S51CAHM3/I offers the optimal balance of automotive-grade reliability, industry-leading 3600 W surge capacity in DO-218AC, and lowest clamping voltage in its class-making it the default choice for demanding 12 V/24 V vehicle subsystems.
Availability
SM5S51CAHM3/I is available at Aetrix Electronics and suitable for automotive electronics, industrial motor drives, and ADAS camera modules requiring stable component supply with full AEC-Q101 traceability and long-term lifecycle support.
Supply support for SM5S51CAHM3/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 TVS devices for automotive, industrial, and computing markets.
The SM5SxxCA family is engineered specifically for automotive-grade transient suppression, combining AEC-Q101 qualification, high-temperature operation, and robust surge immunity for next-generation vehicle electrical architectures.
FAQ
What is the clamping voltage of SM5S51CAHM3/I at its rated peak pulse current?
The SM5S51CAHM3/I has a maximum clamping voltage (VC) of 82.4 V at its specified peak pulse current (IPPM) of 43.7 A under the 10/1000 µs waveform. This value is measured per Figure 4 in the Vishay datasheet (Doc #98458) and represents the upper limit of voltage seen by protected circuitry during a standardized surge event. Designers must ensure downstream components tolerate this clamped level.
Is SM5S51CAHM3/I suitable for 24 V automotive systems?
Yes, SM5S51CAHM3/I is explicitly validated for 24 V automotive applications. Its 51.0 V stand-off voltage (VWM) provides sufficient margin above nominal 24 V rail (typically up to 28 V), while its 3600 W surge rating meets ISO 7637-2 Pulse 5a requirements for 24 V systems. The device's TJ = 175 °C rating further supports under-hood deployment.
Does SM5S51CAHM3/I require a heatsink on the PCB?
No discrete heatsink is required. The DO-218AC package incorporates a metal heatsink tab (Terminal 2) that serves as the primary thermal conduction path. When mounted on a minimum recommended IPC 7351-compliant pad with ≥1 in² of 2 oz. copper, SM5S51CAHM3/I achieves RθJA = 65 °C/W - sufficient for intermittent surge duty. Thermal simulation is advised for continuous high-duty-cycle use.
What does the 'HM3/I' suffix mean in SM5S51CAHM3/I?
In SM5S51CAHM3/I, 'H' denotes AEC-Q101 qualification, 'M3' indicates halogen-free, RoHS-compliant, and Pb-free termination, and 'I' specifies the preferred packaging code: 13-inch plastic tape and reel with 750 units per reel and anode orientation toward sprocket holes. This full suffix confirms compliance with automotive manufacturing and environmental standards.
How does SM5S51CAHM3/I compare to unidirectional TVS diodes in automotive use?
SM5S51CAHM3/I is bidirectional, making it ideal for AC-coupled or polarity-agnostic rails like battery inputs or CAN power lines where voltage reversals may occur. Unidirectional variants (e.g., SM5S51A) offer lower leakage but require correct polarity installation and cannot suppress negative-going transients. For most automotive power rail protection, bidirectional SM5S51CAHM3/I eliminates polarity risk and simplifies layout.
SM5S51CAHM3/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-218AB
- Series:
- PAR®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 51V
- Voltage - Breakdown (Min):
- 56.7V
- Voltage - Clamping (Max) @ Ipp:
- 82.4V
- Current - Peak Pulse (10/1000µs):
- 43.7A
- Power - Peak Pulse:
- 3600W (3.6kW)
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-218AB
SM5S51CAHM3/I FAQ
1.How can I place an order for SM5S51CAHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM5S51CAHM3/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 SM5S51CAHM3/I reliable?
The price and inventory of SM5S51CAHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM5S51CAHM3/I is usually 5 days.
3.What payment methods are accepted for SM5S51CAHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM5S51CAHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM5S51CAHM3/I?
SM5S51CAHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM5S51CAHM3/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 SM5S51CAHM3/I?
For technical support, including SM5S51CAHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM5S51CAHM3/I requirements.
6.How does Aetrix verify that SM5S51CAHM3/I is sourced from the original manufacturer or authorized distributors?
All SM5S51CAHM3/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 SM5S51CAHM3/I meets industry standards.
7.What is the process for return or replacement of SM5S51CAHM3/I?
All SM5S51CAHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SM5S51CAHM3/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 SM5S51CAHM3/I part is unused and in its original packaging.
Return procedure for SM5S51CAHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM5S51CAHM3/I Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
Tech Hub
Comparator circuit design covering voltage thresholds, input limits, open-collector outputs, LM393 wiring, op-amp differences, hysteresis, timing, window detection and practical fault diagnosis.
Schmitt triggers use separate rising and falling thresholds to stabilize slow or noisy signals. This guide covers hysteresis, 74HC14 and 74HCT14 selection, comparator calculations, RC oscillators and p…
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
