My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SM8S54CAHM3/I
- Part No.:
- SM8S54CAHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
SM8S54CAHM3/I.pdf
- Description:
- 6600 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
SM8S54CAHM3/I from Vishay General Semiconductor is a bidirectional surface-mount PAR® transient voltage suppressor (TVS) designed for automotive load dump protection. It features a 60.0 V minimum breakdown voltage (VBR), 54.0 V stand-off voltage (VWM), 87.1 V maximum clamping voltage (VC) at 75.8 A peak pulse current, and 6600 W peak pulse power (10/1000 µs). It operates from −55 °C to +175 °C and is AEC-Q101 qualified for under-hood automotive electronics.
For engineers reviewing the SM8S54CAHM3/I datasheet, SM8S54CAHM3/I pinout, SM8S54CAHM3/I application, or SM8S54CAHM3/I equivalent, this device is selected for high-reliability 12 V/24 V automotive power rail surge suppression where ISO 7637-2 and ISO 16750-2 compliance, low leakage (<10 µA at VWM), and DO-218AC thermal performance are critical.
Technical Context
The SM8S54CAHM3/I uses an avalanche diode structure optimized for fast response (<1 ns) to transients induced by inductive load switching and alternator load dump events. Its DO-218AC package integrates a metal heatsink terminal for low RθJM (0.35 °C/W), enabling high-power dissipation without external heatsinking.
It delivers bidirectional clamping with symmetrical VBR tolerance (±5 %), supports 175 °C junction operation, and meets MSL Level 1 per J-STD-020 with 245 °C reflow peak. The device is halogen-free, RoHS-compliant, and qualified to AEC-Q101 stress test conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min) | 60.0 V - Ensures reliable triggering above normal 54 V load dump threshold while avoiding false trips during battery transients |
| VWM | 54.0 V - Sustains continuous operation across full 12 V/24 V automotive system range including cold-crank and boost conditions |
| VC @ IPPM | 87.1 V - Limits downstream IC voltage stress during 10/1000 µs surges up to 75.8 A, protecting 100 V-rated components |
| PPPM (10/1000 µs) | 6600 W - Handles worst-case ISO 7637-2 Pulse 5a (load dump) without degradation under single-event stress |
| IPPM | 75.8 A - Peak surge current capacity validated at VC, directly supporting design margin against 70 A automotive surge profiles |
| TJ max | +175 °C - Enables placement near high-temperature engine control units or power modules without derating |
| Leakage @ VWM | <10 µA - Minimizes standby power loss in always-on vehicle networks (e.g., CAN wake-up circuits) |
Pinout & Package
SM8S54CAHM3/I is housed in the DO-218AC surface-mount package, featuring a two-terminal configuration with a metal heatsink base (cathode/anode symmetric) and no polarity marking due to bidirectional operation. The package provides low thermal resistance (RθJM = 0.35 °C/W) and meets UL 94 V-0 flammability rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal 1 (Anode-side lead) | Anode connection | One side of bidirectional avalanche junction; soldered to PCB trace for ESD/surge path routing |
| Terminal 2 (Metal heatsink base) | Cathode connection / Thermal path | Primary thermal interface to PCB copper pour; electrically connected to cathode and serves as main current return path |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive under-hood use with temperature cycling, HTRB, and surge endurance testing per JEDEC standards |
| DO-218AC metal heatsink | Enables 6600 W surge handling without external heatsink via direct thermal coupling to PCB copper area |
| Bidirectional clamping | Protects AC-coupled or floating rails (e.g., LIN bus, sensor interfaces) without polarity concerns during layout |
| ISO 7637-2 & ISO 16750-2 compliance | Meets Pulse 5a (load dump) and Pulse 1/2a (inductive switch-off) requirements for 12 V/24 V systems |
| MSL Level 1 rating | Supports standard SMT reflow (peak 245 °C) without moisture sensitivity concerns or baking requirement |
Applications
| Engine Control Unit (ECU) Power Input | Body Control Module (BCM) CAN Bus Protection |
|---|---|
Use Scenario: Protecting 12 V supply input of engine control units exposed to alternator load dump pulses up to 60 V and 350 ms duration. IC Role / Device Role / Timing Role: Primary clamping device on main power rail, absorbing energy before it reaches DC/DC converters and microcontrollers. Use Value: Clamps transients to ≤87.1 V within nanoseconds, preventing latch-up or overvoltage damage to 5 V/3.3 V logic supplies downstream. |
Use Scenario: Safeguarding high-speed CAN FD transceivers from coupled surges on shared vehicle power domains. IC Role / Device Role / Timing Role: Secondary-level TVS placed between power rail and transceiver VCC, complementing primary rail protection. Use Value: Maintains <10 µA leakage at 12 V, ensuring minimal impact on CAN bus biasing while suppressing >1 kV transients. |
| ADAS Camera Power Supply | Electric Power Steering (EPS) Motor Driver |
Use Scenario: Securing 5 V/3.3 V imaging sensor power in front-facing ADAS cameras mounted near engine compartments. IC Role / Device Role / Timing Role: Point-of-load TVS on LDO input, placed after bulk filtering to handle localized ESD and switching noise. Use Value: Operates reliably at +125 °C ambient with 175 °C TJ rating, maintaining clamping performance in thermally constrained camera housings. |
Use Scenario: Protecting gate drivers and current sense amplifiers in EPS motor control boards subjected to PWM-induced voltage spikes. IC Role / Device Role / Timing Role: Bidirectional clamp across half-bridge supply rails to suppress shoot-through-induced transients. Use Value: Symmetrical clamping ensures equal protection during both high-side and low-side switching events without polarity constraints. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ54A-E3/5A | Lower PPPM (400 W), SMA package, unidirectional, VC = 87.1 V at 4.6 A | Limited to lower-energy transients; requires polarity-aware layout and cannot replace SM8S54CAHM3/I in bidirectional or high-surge scenarios | Select only for cost-sensitive non-automotive applications with verified surge energy ≤400 W |
| TPSMD54A | Same DO-218AC package, 6600 W rating, but VBR min = 57.8 V and VC = 89.0 V at 74.2 A; not AEC-Q101 qualified | Acceptable for industrial power supplies but lacks automotive qualification and tighter VBR tolerance (±5 % vs ±10 %) | Use where AEC-Q101 is not mandated and wider VBR variation is acceptable in system margin analysis |
Compared with SMAJ54A-E3/5A and TPSMD54A, SM8S54CAHM3/I delivers higher surge robustness, guaranteed bidirectional operation, and automotive-grade reliability-making it the preferred choice for safety-critical 12 V/24 V load dump protection where ISO 7637-2 compliance and 175 °C operation are required.
Availability
SM8S54CAHM3/I is available at Aetrix Electronics and suitable for automotive electronic control units, body control modules, ADAS camera systems, and electric power steering designs requiring stable component supply across extended temperature ranges and high-reliability surge immunity.
Supply support for SM8S54CAHM3/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 SM8S series is part of Vishay's PAR® TVS platform, engineered specifically for automotive load dump and ISO 7637-2 transient suppression with emphasis on high-temperature stability, AEC-Q101 qualification, and DO-218AC thermal performance.
FAQ
What is the clamping voltage of SM8S54CAHM3/I at its rated peak pulse current?
The SM8S54CAHM3/I has a maximum clamping voltage (VC) of 87.1 V when subjected to its rated 10/1000 µs peak pulse current of 75.8 A. This value is measured per Figure 4 in the official Vishay datasheet (Doc. #98229) and defines the upper voltage limit imposed on protected circuitry during worst-case surge events.
Is SM8S54CAHM3/I suitable for 24 V automotive systems?
Yes, SM8S54CAHM3/I is explicitly designed for 24 V automotive systems. Its 54.0 V stand-off voltage (VWM) accommodates nominal 24 V rails plus tolerances (e.g., 28 V charging), while its 60.0–66.3 V breakdown range ensures robust triggering during load dump transients exceeding 35 V. It meets ISO 16750-2 for 24 V vehicle applications.
Does SM8S54CAHM3/I require a heatsink for 6600 W surge handling?
No external heatsink is required. The DO-218AC package of SM8S54CAHM3/I incorporates a metal heatsink base with RθJM = 0.35 °C/W, enabling full 6600 W (10/1000 µs) surge dissipation through proper PCB copper pour design per Vishay's recommended mounting pad layout.
What does the "HM3/I" suffix indicate in SM8S54CAHM3/I?
The "HM3/I" suffix denotes AEC-Q101 qualification (H), halogen-free/RoHS-compliant construction with matte tin plating (M3), and tape-and-reel packaging with 750-unit reels (I). The "CA" indicates bidirectional polarity, and "54" specifies the 54 V stand-off voltage grade.
How does SM8S54CAHM3/I compare to older SM8S54A variants?
SM8S54CAHM3/I replaces legacy SM8S54A with enhanced reliability: it adds AEC-Q101 qualification, MSL Level 1 rating, JESD201 Class 2 whisker resistance, and tighter VBR tolerance (±5 % vs ±10 %). All electrical specs remain identical, ensuring drop-in compatibility in existing designs requiring upgraded automotive compliance.
SM8S54CAHM3/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):
- 54V
- Voltage - Breakdown (Min):
- 60V
- Voltage - Clamping (Max) @ Ipp:
- 87.1V
- Current - Peak Pulse (10/1000µs):
- 75.8A
- Power - Peak Pulse:
- 6600W (6.6kW)
- 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
SM8S54CAHM3/I FAQ
1.How can I place an order for SM8S54CAHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM8S54CAHM3/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 SM8S54CAHM3/I reliable?
The price and inventory of SM8S54CAHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM8S54CAHM3/I is usually 5 days.
3.What payment methods are accepted for SM8S54CAHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM8S54CAHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM8S54CAHM3/I?
SM8S54CAHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM8S54CAHM3/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 SM8S54CAHM3/I?
For technical support, including SM8S54CAHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM8S54CAHM3/I requirements.
6.How does Aetrix verify that SM8S54CAHM3/I is sourced from the original manufacturer or authorized distributors?
All SM8S54CAHM3/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 SM8S54CAHM3/I meets industry standards.
7.What is the process for return or replacement of SM8S54CAHM3/I?
All SM8S54CAHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SM8S54CAHM3/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 SM8S54CAHM3/I part is unused and in its original packaging.
Return procedure for SM8S54CAHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM8S54CAHM3/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 …
