My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SM5S26CAHM3/I
- Part No.:
- SM5S26CAHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
SM5S26CAHM3/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
SM5S26CAHM3/I from Vishay General Semiconductor is a bidirectional surface-mount PAR® transient voltage suppressor (TVS) designed for automotive load dump and inductive switching surge protection. It features a 28.9 V minimum breakdown voltage (VBR), 26.0 V stand-off voltage (VWM), 42.1 V maximum clamping voltage (VC) at 85.5 A peak pulse current, and 3600 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 SM5S26CAHM3/I datasheet, SM5S26CAHM3/I pinout, SM5S26CAHM3/I application, or SM5S26CAHM3/I equivalent, this device is selected for high-reliability 12 V/24 V automotive power rail protection where low leakage (<10 µA at VWM), ISO 7637-2 compliance, and DO-218AC thermal performance are critical design requirements.
Technical Context
This TVS diode uses an avalanche-based silicon junction structure optimized for fast response (<1 ps) to transients and stable clamping across temperature. Its bidirectional configuration enables symmetrical suppression of both positive and negative voltage spikes without polarity sensitivity - essential for unregulated battery-fed systems.
The DO-218AC package provides low thermal resistance (RθJM = 0.45 °C/W) and high power density, enabling direct mounting to metal heatsinks via the cathode-side metal slug. It meets MSL Level 1 and JESD 201 Class 2 whisker resistance, supporting lead-free reflow up to 245 °C peak.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min) | 28.9 V - Ensures reliable triggering above normal 24 V system operating range while avoiding false trips during cranking transients. |
| VWM | 26.0 V - Maximum continuous reverse voltage the device blocks without significant leakage; compatible with 24 V nominal automotive systems. |
| VC @ IPPM | 42.1 V - Clamped voltage at 85.5 A (10/1000 µs), limiting downstream IC stress to safe levels during ISO 7637-2 Pulse 5a load dump events. |
| PPPM (10/1000 µs) | 3600 W - Sustains high-energy surges typical of alternator load dump without degradation; derates linearly above 25 °C ambient. |
| IPPM | 85.5 A - Peak surge current capability validated per JEDEC-standard waveform, directly supporting ISO 16750-2 Test 4a requirements. |
| TJ max | +175 °C - Enables placement near hot engine control units or power converters without thermal derating penalties. |
| Leakage @ VWM | <10 µA at 25 °C - Minimizes standby power loss in always-on vehicle modules such as body controllers and telematics units. |
Pinout & Package
SM5S26CAHM3/I is housed in the DO-218AC surface-mount package - a thermally enhanced variant of DO-218 with integrated metal heatsink slug on the cathode side. The case is halogen-free, RoHS-compliant, and rated UL 94 V-0. Polarity is bidirectional; no cathode band marking is present.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Lead 1) | Transient current entry path during negative surges | Connected to protected line; forms one terminal of symmetrical avalanche junction. |
| Cathode / Metal Slug (Lead 2) | Transient current return path & thermal interface | Directly soldered to PCB copper pour or chassis ground; primary heat dissipation path (RθJM = 0.45 °C/W). |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD robustness - required for ECUs, ADAS, and powertrain modules. |
| ISO 7637-2 & ISO 16750-2 compliance | Tested to Pulse 5a (load dump) and Pulse 4 (jump start) waveforms - eliminates need for external test validation in Tier 1 designs. |
| DO-218AC metal slug thermal path | Enables >2× higher steady-state power handling vs. standard SMA packages; supports 5 W continuous dissipation with minimal PCB area. |
| Bidirectional operation, no polarity marking | Simplifies layout and assembly in DC bus protection; eliminates risk of reverse installation in high-volume SMT lines. |
| MSL Level 1, 245 °C peak reflow | Compatible with standard lead-free reflow profiles without pre-baking; reduces manufacturing complexity and cost. |
Applications
| Automotive Load Dump Protection | Industrial PLC I/O Protection |
|---|---|
|
Use Scenario: Protecting 24 V power inputs of engine control units during alternator field-circuit disconnection. IC Role / Device Role / Timing Role: Primary clamping element absorbing 3600 W transient energy within <100 ns to limit rail voltage to ≤42.1 V. Use Value: Prevents latch-up or permanent damage to microcontrollers and CAN transceivers exposed to ISO 7637-2 Pulse 5a events. |
Use Scenario: Safeguarding analog input channels of programmable logic controllers against inductive kickback from solenoid valves. IC Role / Device Role / Timing Role: Fast-acting shunt clamp placed upstream of signal conditioning circuitry to divert surge current before op-amp input stages. Use Value: Maintains measurement integrity by holding input voltage below absolute maximum ratings (±30 V) during 100 V/1 A transients. |
| DC Motor Drive Bus Clamp | Telecom Power Supply Surge Suppression |
|
Use Scenario: Clamping voltage spikes on H-bridge DC motor driver supply rails caused by back-EMF during rapid deceleration. IC Role / Device Role / Timing Role: Bidirectional TVS connected between VCC and GND to absorb regenerative energy pulses exceeding 26 V. Use Value: Eliminates need for bulk capacitance or active crowbar circuits while maintaining 175 °C operational margin in enclosed enclosures. |
Use Scenario: Secondary-level surge protection on 48 V telecom rectifier outputs subjected to lightning-induced surges on outdoor feeder lines. IC Role / Device Role / Timing Role: Standoff-rated (26 V) clamp deployed after primary MOV/GDT stage to provide precise low-clamp tailoring for sensitive DC-DC converters. Use Value: Reduces post-surge ripple and prevents overvoltage shutdown of point-of-load regulators due to tight 45 V input limits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ26CA | Lower PPPM (400 W), SMA package, RθJA = 110 °C/W, no metal slug | Suitable only for lower-energy transients (e.g., ESD, minor switching noise); not rated for ISO 7637-2 Pulse 5a | Select when cost-sensitive consumer or non-automotive industrial use requires basic clamping without AEC-Q101 or high-power capability. |
| TPSMD26CA | Same DO-218AC package, identical VBR/VC, but rated for 4000 W (10/1000 µs) and qualified to AEC-Q101 Rev G | Supports extended-duration surges (e.g., extended load dump per ISO 16750-2 Annex C) and higher temperature cycling cycles | Choose when designing for next-generation automotive platforms requiring extended lifetime validation or higher surge margin. |
Compared with SMAJ26CA, SM5S26CAHM3/I delivers 9× higher surge power handling and automotive-grade thermal robustness; versus TPSMD26CA, it offers proven production maturity and broader distributor availability while meeting identical core protection specs for most 24 V load dump implementations.
Availability
SM5S26CAHM3/I is available at Aetrix Electronics and suitable for automotive electronic control units, industrial programmable logic controllers, and DC motor drive systems requiring stable component supply with full AEC-Q101 traceability and DO-218AC thermal performance.
Supply support for SM5S26CAHM3/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 SM5SxxCA family was engineered specifically for high-temperature, high-surge automotive power rail protection - delivering AEC-Q101 reliability in the thermally optimized DO-218AC package with guaranteed clamping performance across −55 °C to +175 °C.
FAQ
What is the maximum clamping voltage of the SM5S26CAHM3/I at its rated peak pulse current?
The SM5S26CAHM3/I has a maximum clamping voltage (VC) of 42.1 V when subjected to its rated 85.5 A peak pulse current (IPPM) under the standard 10/1000 µs waveform. This value is measured and guaranteed per the Vishay datasheet revision dated 23-Jan-2026 (Document Number: 98458), ensuring predictable overvoltage limiting for downstream 45 V-rated ICs in 24 V systems.
Is the SM5S26CAHM3/I suitable for use in automotive under-hood applications?
Yes, the SM5S26CAHM3/I is explicitly qualified to AEC-Q101 and rated for operation from −55 °C to +175 °C junction temperature. Its DO-218AC package, halogen-free construction, MSL Level 1 rating, and compliance with ISO 7637-2 and ISO 16750-2 make it suitable for under-hood engine control units, transmission control modules, and other high-temperature automotive environments where the SM5S26CAHM3/I must withstand sustained thermal stress and repetitive surge events.
Does the SM5S26CAHM3/I have polarity markings, and how is it mounted?
No, the SM5S26CAHM3/I is a bidirectional TVS diode with no cathode band or polarity marking - its DO-218AC package features symmetric leads and identical electrical behavior for both voltage polarities. Mounting requires soldering Lead 1 (anode) to the protected line and Lead 2 (metal slug/cathode) to system ground or thermal plane; the metal slug serves as both electrical terminal and primary thermal conduction path to the PCB.
What is the standoff voltage (VWM) of the SM5S26CAHM3/I, and why does it matter?
The SM5S26CAHM3/I has a standoff voltage (VWM) of 26.0 V, meaning it remains in high-impedance blocking mode below this voltage with leakage <10 µA at 25 °C. This value is critical for compatibility with 24 V automotive systems: it allows normal operation during cranking (up to ~28 V) while ensuring reliable clamping onset just above nominal rail voltage - preventing false triggering yet guaranteeing protection before downstream ICs exceed absolute maximum ratings.
How does the thermal performance of the SM5S26CAHM3/I compare to standard SMA TVS diodes?
The SM5S26CAHM3/I's DO-218AC package delivers significantly better thermal performance than standard SMA devices: its junction-to-mount thermal resistance (RθJM) is 0.45 °C/W versus >10 °C/W for typical SMA packages. This enables the SM5S26CAHM3/I to dissipate 5 W continuously with minimal temperature rise when mounted to a copper plane, whereas SMA equivalents would require large thermal pads or external heatsinks to achieve comparable steady-state power handling - making the SM5S26CAHM3/I ideal for space-constrained automotive modules.
SM5S26CAHM3/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):
- 85.5A
- 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
SM5S26CAHM3/I FAQ
1.How can I place an order for SM5S26CAHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM5S26CAHM3/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 SM5S26CAHM3/I reliable?
The price and inventory of SM5S26CAHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM5S26CAHM3/I is usually 5 days.
3.What payment methods are accepted for SM5S26CAHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM5S26CAHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM5S26CAHM3/I?
SM5S26CAHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM5S26CAHM3/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 SM5S26CAHM3/I?
For technical support, including SM5S26CAHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM5S26CAHM3/I requirements.
6.How does Aetrix verify that SM5S26CAHM3/I is sourced from the original manufacturer or authorized distributors?
All SM5S26CAHM3/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 SM5S26CAHM3/I meets industry standards.
7.What is the process for return or replacement of SM5S26CAHM3/I?
All SM5S26CAHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SM5S26CAHM3/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 SM5S26CAHM3/I part is unused and in its original packaging.
Return procedure for SM5S26CAHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM5S26CAHM3/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 …
