My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SM8S14CAHM3/I
- Part No.:
- SM8S14CAHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
SM8S14CAHM3/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
SM8S14CAHM3/I from Vishay General Semiconductor is a bidirectional surface-mount PAR® transient voltage suppressor (TVS) diode in DO-218AC package, rated for 14 V stand-off voltage (VWM), 16.4 V nominal breakdown (VBR), and 6600 W peak pulse power (10/1000 μs). It delivers 284 A peak pulse current and clamps transients to ≤23.2 V, designed specifically for automotive load dump protection under ISO 7637-2 and ISO 16750-2.
For engineers reviewing the SM8S14CAHM3/I datasheet, SM8S14CAHM3/I pinout, SM8S14CAHM3/I application, or SM8S14CAHM3/I equivalent, this AEC-Q101 qualified TVS offers TJ = 175 °C operation, MSL Level 1 reliability, halogen-free RoHS-compliant construction, and verified surge immunity in high-temperature automotive power rail environments.
Technical Context
This device operates as a bidirectional clamping TVS diode with symmetrical avalanche breakdown behavior, enabling protection of both polarities without polarity marking. Its DO-218AC package integrates a metal heatsink terminal for low thermal resistance (RθJM = 0.35 °C/W) and supports high-energy surge dissipation up to 6600 W with 10/1000 μs waveform.
Designed for automotive-grade reliability, SM8S14CAHM3/I meets AEC-Q101 stress testing, withstands 245 °C reflow per J-STD-020, and maintains ≤10 μA reverse leakage at VWM (14 V) and ≤15 μA at TJ = 175 °C - critical for battery-sensed circuits where leakage-induced drain must be minimized.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 14.0 V - maximum continuous reverse operating voltage before clamping begins; defines safe operating margin below system nominal 12 V battery rail. |
| VBR (nom) | 16.4 V - nominal breakdown voltage at 5 mA test current; ensures reliable turn-on during load dump events exceeding 14 V. |
| VC @ IPPM | 23.2 V - clamping voltage at 284 A peak pulse; limits downstream IC voltage stress during ISO 7637-2 Pulse 5a (load dump). |
| PPPM (10/1000 μs) | 6600 W - peak pulse power handling; enables single-device protection against 12 V automotive load dump surges up to 120 V/350 ms. |
| TJ max | +175 °C - maximum junction temperature rating; supports under-hood placement and sustained operation in high-ambient engine bay environments. |
| Leakage @ VWM | ≤10 μA at 25 °C - ultra-low reverse leakage preserves battery life in always-on vehicle modules such as body control units. |
| Package | DO-218AC - surface-mount package with integrated metal heatsink terminal (Lead 2); provides mechanical robustness and enhanced thermal conduction vs. standard SMA/SMB. |
Pinout & Package
DO-218AC package features two terminals: Lead 1 (anode/cathode indeterminate due to bidirectionality) and Lead 2 (metal heatsink tab, electrically connected to cathode in unidirectional variants but internally symmetric in bidirectional SM8SxxCA series). No polarity marking; device is functionally symmetric.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Lead 1 | Anode/Cathode (bidirectional) | Electrically interchangeable terminal; connects to protected line (e.g., battery rail or signal line) without orientation constraint. |
| Lead 2 (Metal Tab) | Heatsink / Common Terminal | Low-inductance, high-current return path; must be soldered to large copper pour for optimal thermal and surge performance. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive use via stress tests including HTGB, HTRB, TCT, and ESD - required for ECUs, ADAS, and powertrain modules. |
| MSL Level 1 rating | Supports standard SMT reflow profiles up to 245 °C peak without moisture-induced damage; eliminates bake requirements pre-assembly. |
| Halogen-free & RoHS-compliant (M3) | Meets global environmental regulations and automotive material compliance standards (e.g., VW 80101); no brominated flame retardants. |
| Junction temperature capability | Rated for continuous operation from –55 °C to +175 °C - enables placement near power converters, alternators, or motor drivers. |
| ISO 7637-2 & ISO 16750-2 compliance | Tested to withstand load dump (Pulse 5a), jump start (Pulse 4), and supply voltage fluctuations - certified for 12 V automotive systems. |
Applications
| Engine Control Unit (ECU) Power Input | Body Control Module (BCM) Battery Rail |
|---|---|
Use Scenario: Protects microcontroller, CAN transceivers, and analog sensors from 12 V battery rail transients during alternator load dump and cranking. IC Role / Device Role / Timing Role: Clamping TVS placed directly at ECU input connector to limit voltage excursion to ≤23.2 V during ISO 7637-2 Pulse 5a (120 V, 400 ms). Use Value: Prevents latch-up or permanent damage to 3.3 V/5 V logic supplies by holding rail voltage within safe operating area of LDOs and DC-DC controllers. | Use Scenario: Shields BCM power inputs from voltage spikes induced by relay switching, window motor commutation, and HVAC blower activation. IC Role / Device Role / Timing Role: Bidirectional suppression on fused 12 V feed to BCM; absorbs repetitive 50–100 A surges with <10 μA standby leakage. Use Value: Eliminates need for secondary filtering or derating of upstream fuses, reducing BOM count and PCB space in space-constrained door modules. |
| Advanced Driver Assistance Systems (ADAS) Camera Power | Infotainment Head Unit Power Supply |
Use Scenario: Secures front/rear camera module power lines exposed to engine bay EMI and load dump coupling through shared harnesses. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 12 V input to camera's DC-DC converter; activated within nanoseconds of transient onset. Use Value: Maintains uninterrupted video stream during ignition cycles by preventing brownout or reset caused by >20 V excursions on input rail. | Use Scenario: Guards infotainment head unit main power input against jump-start surges (ISO 16750-2 Pulse 4) and battery reversal transients. IC Role / Device Role / Timing Role: Bidirectional TVS on 12 V input stage; clamps both positive overvoltage and negative-going spikes from ground bounce. Use Value: Avoids audio distortion, display flicker, or firmware crash during roadside jump starts - improving end-user reliability perception. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ14AHE3/5BT | Unidirectional; SMA package; 400 W PPPM (10/1000 μs); VBR min 15.6 V; higher RθJA (95 °C/W). | Limited to single-polarity protection; unsuitable for ISO 7637-2 bidirectional load dump; lower surge capacity requires parallel devices for equivalent energy handling. | Select only for cost-sensitive non-automotive applications where bidirectionality and 6600 W rating are not required. |
| TPSMD14CA | Bidirectional; DO-214AB package; 6600 W PPPM; VBR min 15.6 V; same clamping voltage (23.2 V); AEC-Q101 qualified; MSL Level 1. | Compatible surge performance but larger footprint (DO-214AB vs. DO-218AC); lacks integrated metal heatsink; RθJM = 0.8 °C/W vs. 0.35 °C/W. | Acceptable for less thermally demanding locations; avoid in high-power density modules where heatsink conduction is critical. |
Compared with SMAJ14AHE3/5BT and TPSMD14CA, SM8S14CAHM3/I uniquely combines bidirectional 6600 W surge capability, DO-218AC metal-tab thermal enhancement, and AEC-Q101 qualification - making it the only option among the three validated for under-hood automotive load dump protection with minimal PCB thermal design overhead.
Availability
SM8S14CAHM3/I is available at Aetrix Electronics and suitable for automotive electronic control units, body control modules, ADAS camera power supplies, and infotainment head units requiring stable component supply across extended temperature and high-reliability production cycles.
Supply support for SM8S14CAHM3/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 diodes, rectifiers, MOSFETs, and protection devices with emphasis on automotive, industrial, and computing applications.
The SM8SxxCA family is engineered for high-energy transient suppression in 12 V automotive systems, targeting load dump, jump start, and inductive switching events - with design focus on thermal robustness, AEC-Q101 compliance, and DO-218AC package integration.
FAQ
What is the maximum clamping voltage of SM8S14CAHM3/I at its rated peak pulse current?
The SM8S14CAHM3/I has a maximum clamping voltage (VC) of 23.2 V when subjected to its rated peak pulse current (IPPM) of 284 A under the 10/1000 μs waveform. This value is measured per Figure 4 in the Vishay datasheet (Doc. #98229) and defines the upper voltage limit imposed on protected circuitry during worst-case surge events like ISO 7637-2 Pulse 5a. The SM8S14CAHM3/I maintains this clamping performance across its full operating temperature range.
Is SM8S14CAHM3/I suitable for bidirectional transient protection in automotive applications?
Yes, SM8S14CAHM3/I is explicitly designed as a bidirectional TVS diode, confirmed by its "CA" suffix (indicating bidirectional configuration), absence of cathode band marking, and symmetric electrical characteristics in the datasheet. It meets ISO 7637-2 and ISO 16750-2 requirements for both positive and negative transients - making it appropriate for protecting 12 V battery rails, CAN bus lines, and other bidirectional automotive interfaces where polarity reversal or AC-coupled noise may occur.
What does the "HM3/I" suffix in SM8S14CAHM3/I signify?
The "HM3/I" suffix in SM8S14CAHM3/I decodes as follows: "H" denotes AEC-Q101 qualification; "M3" specifies halogen-free, RoHS-compliant, lead-free termination meeting JESD 201 Class 2 whisker resistance; and "I" indicates packaging in 13-inch plastic tape and reel with anode oriented toward sprocket hole. This full suffix confirms the part's automotive-grade material composition, reliability certification, and standardized surface-mount delivery format - all documented in Vishay's ordering information table (Doc. #98229, page 3).
How does the DO-218AC package of SM8S14CAHM3/I improve thermal performance compared to standard SMB or SMA packages?
The DO-218AC package of SM8S14CAHM3/I incorporates a large metal heatsink tab (Lead 2) that provides direct thermal conduction to the PCB copper pour, achieving a junction-to-mount thermal resistance (RθJM) of just 0.35 °C/W - significantly lower than typical SMB (≈15 °C/W) or SMA (≈25 °C/W) packages. This enables sustained power dissipation and higher surge repetition rates without thermal runaway, especially critical in confined engine compartment layouts where airflow is limited and ambient temperatures exceed 105 °C.
Does SM8S14CAHM3/I require orientation during PCB placement?
No, SM8S14CAHM3/I does not require specific orientation during PCB placement because it is a bidirectional TVS diode with no cathode marking or polarity dependence. The DO-218AC package has identical electrical behavior regardless of which lead connects to the protected line or ground - confirmed by its symmetric VBR and VC specifications and explicit note in the Vishay datasheet stating "polarity: bidirectional, no cathode band." This simplifies automated assembly and eliminates orientation-related field failures.
SM8S14CAHM3/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):
- 14V
- Voltage - Breakdown (Min):
- 15.6V
- Voltage - Clamping (Max) @ Ipp:
- 23.2V
- Current - Peak Pulse (10/1000µs):
- 284A
- 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
SM8S14CAHM3/I FAQ
1.How can I place an order for SM8S14CAHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM8S14CAHM3/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 SM8S14CAHM3/I reliable?
The price and inventory of SM8S14CAHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM8S14CAHM3/I is usually 5 days.
3.What payment methods are accepted for SM8S14CAHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM8S14CAHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM8S14CAHM3/I?
SM8S14CAHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM8S14CAHM3/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 SM8S14CAHM3/I?
For technical support, including SM8S14CAHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM8S14CAHM3/I requirements.
6.How does Aetrix verify that SM8S14CAHM3/I is sourced from the original manufacturer or authorized distributors?
All SM8S14CAHM3/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 SM8S14CAHM3/I meets industry standards.
7.What is the process for return or replacement of SM8S14CAHM3/I?
All SM8S14CAHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SM8S14CAHM3/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 SM8S14CAHM3/I part is unused and in its original packaging.
Return procedure for SM8S14CAHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM8S14CAHM3/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 …
