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Vishay General Semiconductor - Diodes Division SM8S26CAHM3/I
- Part No.:
- SM8S26CAHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
SM8S26CAHM3/I.pdf
- Description:
- 6600 W BI-DIRECTIONAL TVS IS DO-
- Quantity:
- Payment:
- Shipping:
Inventory:2,987
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Product details
Overview
SM8S26CAHM3/I from Vishay General Semiconductor is a bidirectional surface-mount PAR® transient voltage suppressor (TVS) designed for automotive load dump protection. It features a 26 V standoff voltage (VWM), 30.4 V nominal breakdown voltage (VBR), 42.1 V maximum clamping voltage at 157 A peak pulse current, and 6600 W peak pulse power rating with 10/1000 μs waveform. Rated for TJ = 175 °C operation and AEC-Q101 qualified, it is used in 12 V automotive power rail protection.
For engineers reviewing the SM8S26CAHM3/I datasheet, SM8S26CAHM3/I pinout, SM8S26CAHM3/I application, or SM8S26CAHM3/I equivalent, this page delivers verified electrical parameters, DO-218AC package details, ISO 7637-2 compliance status, thermal resistance (RθJA = 55 °C/W), and validated alternative parts for automotive-grade TVS selection.
Technical Context
This device operates as a voltage-clamping protector in parallel with sensitive electronics, responding to transients within nanoseconds. Its bidirectional structure enables symmetrical clamping of positive and negative surges without polarity dependency, and its low leakage (<10 μA at VWM, <15 μA at TJ = 175 °C) ensures minimal standby power impact on 12 V systems.
The SM8S26CAHM3/I leverages the DO-218AC package's integrated metal heatsink terminal for low thermal resistance (RθJM = 0.35 °C/W), enabling high-energy surge dissipation without external heatsinking. It meets ISO 16750-2 for supply voltage transients and is qualified per AEC-Q101 for under-hood automotive environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 26.0 V - Maximum reverse stand-off voltage before clamping begins; defines safe operating window for 12 V automotive systems. |
| VBR (min/typ/max) | 28.9 / 30.4 / 31.9 V - Breakdown threshold range at 5 mA test current; ensures reliable turn-on during load dump events. |
| VC @ IPPM | 42.1 V - Clamping voltage at 157 A peak pulse current (10/1000 μs); limits downstream voltage stress during worst-case transients. |
| PPPM (10/1000 μs) | 6600 W - Peak pulse power handling capacity; supports high-energy ISO 7637-2 Pulse 5a/b load dump waveforms. |
| TJ max | 175 °C - Maximum junction temperature rating; enables placement near hot engine compartments without derating. |
| RθJA | 55 °C/W - Junction-to-ambient thermal resistance on FR4 PCB with standard footprint; determines required board copper area for thermal management. |
| AEC-Q101 | Qualified - Certified for automotive reliability including temperature cycling, HTRB, and ESD; eliminates need for additional qualification testing. |
Pinout & Package
Package: DO-218AC - Surface-mount, bidirectional TVS with integrated metal heatsink terminal (Lead 2), matte tin-plated leads, halogen-free and RoHS-compliant (M3 suffix), MSL Level 1 rated.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Lead 1 | Anode / Cathode (bidirectional) | No polarity marking; functions identically for both polarities; connected to PCB trace requiring surge protection. |
| Lead 2 / Metal Heatsink | Common terminal / Thermal path | Primary thermal interface to PCB copper pour; must be soldered to ≥25 mm² copper area for rated RθJA performance. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or dual-polarity DC rails without orientation constraints or external diodes. |
| 175 °C junction rating | Supports direct mounting in high-temperature zones (e.g., engine control units) without thermal derating below full power capability. |
| ISO 7637-2 & ISO 16750-2 compliance | Validated for automotive load dump (Pulse 5) and supply voltage transient immunity, reducing system-level validation effort. |
| Low leakage at high temperature | ≤15 μA at VWM and TJ = 175 °C ensures minimal battery drain in always-on vehicle modules (e.g., body control units). |
| DO-218AC metal heatsink | Reduces thermal resistance by >80% vs. standard SMC packages, enabling higher surge energy absorption in compact layouts. |
Applications
| Automotive Engine Control Unit (ECU) | Body Control Module (BCM) |
|---|---|
Use Scenario: Protects microcontroller power inputs from alternator load dump transients during battery disconnection. IC Role / Device Role: Primary parallel clamping TVS on 12 V main rail upstream of DC/DC converter. Use Value: Limits clamped voltage to 42.1 V, preventing overvoltage damage to 40 V-rated input stages of buck controllers and LDOs. |
Use Scenario: Shields LIN bus transceiver power pins from coupled transients induced by nearby relay switching. IC Role / Device Role: Local rail clamp adjacent to transceiver IC, minimizing trace inductance between TVS and protected node. Use Value: Sub-100 ns response time and 157 A surge capacity absorb fast-switching noise without affecting LIN signal integrity. |
| Advanced Driver Assistance Systems (ADAS) Camera Module | Electric Power Steering (EPS) Control Unit |
Use Scenario: Guards image sensor and ISP power supplies against ignition-induced transients in front-end camera harnesses. IC Role / Device Role: Secondary protection stage after fuse and primary filter, placed directly at sensor power entry point. Use Value: 175 °C rating allows placement near lens housing; low capacitance (<100 pF at VWM) avoids degrading high-speed MIPI clock signals. |
Use Scenario: Safeguards motor driver gate drivers and current sense amplifiers from inductive kickback during steering actuation. IC Role / Device Role: High-power rail clamp on 12 V auxiliary supply feeding half-bridge gate drivers and op-amps. Use Value: 6600 W peak power rating handles repetitive 10/1000 μs pulses from PWM-driven motors without degradation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ26A-E3/57T | Lower PPPM (400 W vs. 6600 W); SMA package (RθJA ≈ 100 °C/W); unidirectional only. | Not suitable for load dump; limited to low-energy ESD/surge in consumer electronics or non-automotive 12 V systems. | Select only if surge energy is <50 mJ and ambient temperature remains <85 °C; requires external series resistor for bidirectional use. |
| TPSMD26CA | Same DO-218AC package and 26 V VWM; lower clamping voltage (40.5 V vs. 42.1 V); 6000 W PPPM (10/1000 μs). | Compatible for most load dump designs but marginally lower surge margin; not AEC-Q101 qualified (only AEC-Q200). | Prefer when cost sensitivity outweighs automotive qualification requirements; verify system-level ISO 7637-2 margin with 1.5× safety factor. |
Compared with SMAJ26A-E3/57T and TPSMD26CA, the SM8S26CAHM3/I delivers 16× higher surge power, guaranteed AEC-Q101 qualification, and superior thermal performance-making it the only choice for production automotive load dump protection where reliability and regulatory compliance are mandatory.
Availability
SM8S26CAHM3/I is available at Aetrix Electronics and suitable for automotive engine control units, body control modules, ADAS camera systems, and electric power steering control units requiring stable component supply across extended temperature and high-reliability operational profiles.
Supply support for SM8S26CAHM3/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, TVS devices, and optoelectronics with emphasis on automotive, industrial, and computing applications.
The SM8SxxCA family was engineered specifically for high-energy automotive load dump protection, combining AEC-Q101 qualification, DO-218AC thermal efficiency, and ISO 7637-2 compliance in a single robust platform.
FAQ
What is the maximum clamping voltage of the SM8S26CAHM3/I at its rated peak pulse current?
The SM8S26CAHM3/I has a maximum clamping voltage (VC) of 42.1 V at its rated peak pulse current (IPPM) of 157 A under the 10/1000 μs waveform condition. This value is measured per Figure 4 in the official Vishay datasheet (Document Number: 98229) and defines the upper voltage limit imposed on protected circuitry during worst-case surge events. The SM8S26CAHM3/I maintains this clamping performance across its full operating temperature range up to TJ = 175 °C.
Is the SM8S26CAHM3/I suitable for bidirectional transient protection without polarity concerns?
Yes, the SM8S26CAHM3/I is explicitly designed as a bidirectional TVS diode with no cathode band marking and symmetrical clamping characteristics for both positive and negative transients. Its DO-218AC package has identical electrical behavior regardless of orientation on the PCB, eliminating assembly errors and simplifying layout for AC-coupled or dual-rail systems. This bidirectional functionality is confirmed in the "Polarity" section of the Vishay SM8S10CA–SM8S85CA datasheet.
Does the SM8S26CAHM3/I meet automotive qualification standards?
Yes, the SM8S26CAHM3/I is AEC-Q101 qualified, as indicated by the "H" in its part number suffix and explicitly stated in the Ordering Information Table and Features section of the Vishay datasheet. It has passed stress tests including high-temperature reverse bias (HTRB), temperature cycling, and mechanical shock-ensuring reliability in under-hood automotive environments. The "M3" suffix further confirms halogen-free, RoHS-compliant, and whisker-resistant construction per JESD 201 Class 2.
What is the thermal resistance junction-to-ambient (RθJA) for the SM8S26CAHM3/I, and how is it measured?
The SM8S26CAHM3/I has a thermal resistance junction-to-ambient (RθJA) of 55 °C/W, measured per JEDEC 51-2A on an FR4 PCB with the manufacturer-recommended minimum pad layout (including thermal relief and copper pour on Lead 2). This value assumes standard 2 oz. copper and defines the temperature rise above ambient per watt of steady-state power dissipation. For pulsed operation, transient thermal impedance curves (Figure 7) govern short-duration heating behavior.
How does the SM8S26CAHM3/I compare to standard SMAJ-series TVS diodes in surge handling capability?
The SM8S26CAHM3/I delivers 6600 W peak pulse power (10/1000 μs), exceeding SMAJ26A's 400 W by over 16×. This difference stems from the DO-218AC package's integrated metal heatsink (Lead 2), which reduces RθJM to 0.35 °C/W versus SMA's ~20 °C/W. As a result, the SM8S26CAHM3/I sustains far higher surge currents-157 A vs. ~23 A-and is certified for ISO 7637-2 load dump, while SMAJ parts are limited to IEC 61000-4-2 ESD and low-energy transients.
SM8S26CAHM3/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):
- 26V
- Voltage - Breakdown (Min):
- 28.9V
- Voltage - Clamping (Max) @ Ipp:
- 42.1V
- Current - Peak Pulse (10/1000µs):
- 157A
- 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
SM8S26CAHM3/I FAQ
1.How can I place an order for SM8S26CAHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM8S26CAHM3/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 SM8S26CAHM3/I reliable?
The price and inventory of SM8S26CAHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM8S26CAHM3/I is usually 5 days.
3.What payment methods are accepted for SM8S26CAHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM8S26CAHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM8S26CAHM3/I?
SM8S26CAHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM8S26CAHM3/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 SM8S26CAHM3/I?
For technical support, including SM8S26CAHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM8S26CAHM3/I requirements.
6.How does Aetrix verify that SM8S26CAHM3/I is sourced from the original manufacturer or authorized distributors?
All SM8S26CAHM3/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 SM8S26CAHM3/I meets industry standards.
7.What is the process for return or replacement of SM8S26CAHM3/I?
All SM8S26CAHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SM8S26CAHM3/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 SM8S26CAHM3/I part is unused and in its original packaging.
Return procedure for SM8S26CAHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM8S26CAHM3/I Tags
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