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Vishay General Semiconductor - Diodes Division SM5S85CAHM3/I
- Part No.:
- SM5S85CAHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-218AB
- Datasheet:
-
SM5S85CAHM3/I.pdf
- Description:
- 3600 W BI-DIRECTIONAL TVS IS DO-
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
SM5S85CAHM3/I from Vishay General Semiconductor is a bidirectional surface-mount PAR® transient voltage suppressor (TVS) diode in DO-218AC package, with 94.4 V minimum breakdown voltage, 85 V stand-off voltage, and 3600 W peak pulse power (10/1000 µs). It delivers 26.3 A peak pulse current and clamps to 137 V at rated surge, meeting AEC-Q101 qualification for automotive load dump protection.
For engineers reviewing the SM5S85CAHM3/I datasheet, SM5S85CAHM3/I pinout, SM5S85CAHM3/I application, or SM5S85CAHM3/I equivalent, this device is selected for high-reliability 12 V/24 V automotive power rail protection where TJ = 175 °C operation, ISO 7637-2 compliance, and low leakage (<10 µA at VWM) are critical design requirements.
Technical Context
The SM5S85CAHM3/I employs a silicon avalanche structure optimized for fast response (<1 ns) to transients induced by inductive switching and load dump events. Its bidirectional configuration enables symmetrical clamping without polarity sensitivity, and its DO-218AC package integrates a metal heatsink terminal for low RθJM (0.45 °C/W) and enhanced thermal robustness.
Designed for automotive-grade reliability, it operates across -55 °C to +175 °C junction temperature range, meets MSL Level 1 per J-STD-020, and passes JESD201 Class 2 whisker testing. Its 5 W steady-state power dissipation and 65 °C/W RθJA support operation on standard FR-4 PCBs with minimal heatsinking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min) | 94.4 V - Ensures reliable triggering above normal 24 V system overvoltage thresholds |
| VWM | 85 V - Sustains continuous reverse bias up to battery+load dump pre-clamp level |
| IPPM (10/1000 µs) | 26.3 A - Supports high-energy surge handling per ISO 7637-2 Pulse 5a/b |
| VC @ IPPM | 137 V - Limits downstream IC stress during worst-case 3600 W transient event |
| TJ max | +175 °C - Enables under-hood placement without derating in engine control units |
| Polarity | Bidirectional - Eliminates orientation concerns during automated assembly |
| Package | DO-218AC - Metal heatsink terminal reduces thermal resistance to 0.45 °C/W |
Pinout & Package
DO-218AC package features two terminals: Lead 1 (anode/cathode indeterminate due to bidirectionality) and Lead 2 (metal heatsink tab), mounted on FR-4 PCB using standard IPC-7351 footprint. The heatsink tab provides primary thermal path to PCB copper.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Lead 1 | Anode/Cathode (bidirectional) | No polarity marking required; symmetric conduction in either direction |
| Lead 2 / Metal Heatsink Tab | Thermal & Electrical Return Path | Primary heat extraction node; must be soldered to large copper pour for RθJM = 0.45 °C/W |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics per stress test conditions including HTGB, HTRB, and TCT |
| ISO 7637-2 compliant | Withstands load dump pulses up to 60 V/350 ms (Pulse 5a) and 76 V/400 ms (Pulse 5b) |
| RθJM = 0.45 °C/W | Enables >90% of surge energy to dissipate through heatsink tab into PCB plane |
| Leakage <10 µA @ VWM | Minimizes standby current draw in always-on vehicle modules (e.g., body controllers) |
| Halogen-free, RoHS-compliant (M3) | Meets automotive material compliance standards including ELV and IMDS reporting |
Applications
| Engine Control Unit (ECU) Power Input Protection | Automotive Infotainment Power Rail Clamp |
|---|---|
Use Scenario: Protects ECU microcontroller and CAN transceivers from 24 V truck load dump surges up to 60 V/350 ms. IC Role / Device Role / Timing Role: Primary clamping element on main 24 V input rail, activated within <1 ns of overvoltage onset. Use Value: Clamps to 137 V while sustaining 26.3 A peak current, limiting stress on downstream 16 V-rated DC-DC converters. | Use Scenario: Shields infotainment head unit power supply from alternator-induced transients during ignition cycling. IC Role / Device Role / Timing Role: Bidirectional TVS placed between fuse output and DC-DC input, operating continuously at 13.5 V nominal. Use Value: 85 V VWM avoids false triggering during cold-crank dips and cranking spikes, while 175 °C rating supports under-dash mounting. |
| ADAS Camera Module Surge Suppression | Electric Power Steering (EPS) Motor Driver Protection |
Use Scenario: Safeguards 12 V camera module against ISO 16750-2 supply voltage transients during battery jump-starts. IC Role / Device Role / Timing Role: Final-stage transient clamp before LDO regulator input, placed adjacent to connector entry point. Use Value: 3600 W PPPM rating handles 10/1000 µs spikes without degradation; DO-218AC metal tab ensures stable thermal performance at 85 °C ambient. | Use Scenario: Absorbs inductive kickback from 24 V EPS motor windings during PWM switching transitions. IC Role / Device Role / Timing Role: Parallel-connected TVS across H-bridge high-side and low-side FET drains. Use Value: Bidirectional operation eliminates need for dual unidirectional devices; 137 V clamping prevents FET avalanche failure during 100 A+ motor stall events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ85CA-E3/5A | Unidirectional; SMA package; lower PPPM (400 W); VC = 137 V at 2.9 A | Limited to single-polarity rails; insufficient for automotive load dump energy | Select only for low-energy industrial 12 V logic rail protection |
| TPSMD85A | Unidirectional; DO-214AB package; PPPM = 3000 W (10/1000 µs); VC = 137 V at 22 A | Lower surge rating; not AEC-Q101 qualified; no 175 °C rating | Acceptable for non-automotive 24 V systems with reduced surge severity |
Compared with SMAJ85CA-E3/5A and TPSMD85A, the SM5S85CAHM3/I uniquely combines AEC-Q101 qualification, 3600 W surge capability, bidirectional symmetry, and 175 °C operation-making it the only option suitable for front-end protection in automotive ECUs and ADAS modules requiring full ISO 7637-2 compliance.
Availability
SM5S85CAHM3/I is available at Aetrix Electronics and suitable for automotive ECU design, ADAS camera power conditioning, and electric power steering (EPS) motor driver protection requiring stable component supply and long-term lifecycle assurance.
Supply support for SM5S85CAHM3/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 TVS devices with emphasis on automotive, industrial, and computing applications.
The SM5SxxCA family is engineered specifically for high-energy automotive transient suppression, targeting load dump and inductive switching events in 12 V and 24 V systems with AEC-Q101 validation and extended temperature operation.
FAQ
What is the maximum clamping voltage of the SM5S85CAHM3/I at its rated peak pulse current?
The SM5S85CAHM3/I has a maximum clamping voltage (VC) of 137 V when subjected to its rated 26.3 A peak pulse current (IPPM) under the 10/1000 µs waveform condition. This value is measured per Figure 4 in the Vishay datasheet 98458 and defines the upper voltage limit imposed on protected circuitry during worst-case surge events.
Is the SM5S85CAHM3/I suitable for 24 V automotive systems experiencing load dump events?
Yes, the SM5S85CAHM3/I is explicitly designed for 24 V automotive load dump protection. With an 85 V stand-off voltage (VWM) and 94.4–104 V breakdown range, it remains non-conductive during normal operation and triggers reliably during ISO 7637-2 Pulse 5a/b events. Its 3600 W peak pulse power rating exceeds typical load dump energy requirements.
Does the SM5S85CAHM3/I require polarity-aware PCB layout?
No, the SM5S85CAHM3/I is a bidirectional TVS diode with no cathode band marking and symmetric electrical characteristics. Its DO-218AC package has identical terminal behavior in both directions, eliminating orientation constraints during pick-and-place assembly and simplifying layout for differential or floating rail applications.
What thermal performance can be expected from the SM5S85CAHM3/I on a standard FR-4 PCB?
When mounted per JEDEC 51-2A on a standard FR-4 board with recommended pad layout, the SM5S85CAHM3/I exhibits RθJA = 65 °C/W. With its metal heatsink tab (Lead 2), it achieves RθJM = 0.45 °C/W - meaning >90% of surge heat transfers directly from junction to PCB copper, enabling sustained operation at 175 °C junction temperature.
How does the HM3 suffix in SM5S85CAHM3/I affect its compliance and reliability?
"HM3" denotes halogen-free, RoHS-compliant construction with matte tin-plated leads that pass JESD201 Class 2 whisker testing, and AEC-Q101 qualification. This suffix confirms the SM5S85CAHM3/I meets automotive material and process reliability standards - including high-temperature storage life, temperature cycling, and mechanical shock - required for under-hood deployment.
SM5S85CAHM3/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):
- 85V
- Voltage - Breakdown (Min):
- 94.4V
- Voltage - Clamping (Max) @ Ipp:
- 137V
- Current - Peak Pulse (10/1000µs):
- 26.3A
- 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
SM5S85CAHM3/I FAQ
1.How can I place an order for SM5S85CAHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM5S85CAHM3/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 SM5S85CAHM3/I reliable?
The price and inventory of SM5S85CAHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM5S85CAHM3/I is usually 5 days.
3.What payment methods are accepted for SM5S85CAHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM5S85CAHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM5S85CAHM3/I?
SM5S85CAHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM5S85CAHM3/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 SM5S85CAHM3/I?
For technical support, including SM5S85CAHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM5S85CAHM3/I requirements.
6.How does Aetrix verify that SM5S85CAHM3/I is sourced from the original manufacturer or authorized distributors?
All SM5S85CAHM3/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 SM5S85CAHM3/I meets industry standards.
7.What is the process for return or replacement of SM5S85CAHM3/I?
All SM5S85CAHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SM5S85CAHM3/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 SM5S85CAHM3/I part is unused and in its original packaging.
Return procedure for SM5S85CAHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM5S85CAHM3/I Tags
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