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Vishay General Semiconductor - Diodes Division SMC3K85CAHM3_A/H
- Part No.:
- SMC3K85CAHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMC3K85CAHM3_A/H.pdf
- Description:
- 3KW, 85V 5%,BIDIR,SMC TVS
- Quantity:
- Payment:
- Shipping:
Inventory:1,685
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Product details
Overview
SMC3K85CAHM3_A from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) designed for automotive-grade overvoltage protection in 12 V battery systems. It features a 85 V stand-off voltage (VWM), 94.4–104 V breakdown voltage (VBR), 3000 W peak pulse power (10/1000 μs), and clamps to 137 V at 21.9 A, meeting ISO 7637-2 and ISO 16750-2 transient immunity requirements for engine control units and sensor interfaces.
For engineers reviewing the SMC3K85CAHM3_A datasheet, SMC3K85CAHM3_A pinout, SMC3K85CAHM3_A application, or SMC3K85CAHM3_A equivalent, this device is selected for high-energy surge suppression in AEC-Q101-qualified automotive electronics where low clamping voltage, fast response (<1 ns), and robust 30 kV ESD immunity per IEC 61000-4-2 are critical design requirements.
Technical Context
This TVS diode operates as a voltage-clamping protector across sensitive IC inputs or power rails, activating when transients exceed its VWM of 85 V and clamping to ≤137 V at 21.9 A (10/1000 μs). Its bidirectional structure enables symmetrical protection against both positive and negative polarity surges without polarity marking.
It delivers 30 kW peak pulse power under 8/20 μs waveform, supports junction temperatures up to +175 °C, and exhibits low incremental surge resistance - enabling effective suppression of load dump (ISO 16750-2 Pulse b) and switching transients (ISO 7637-2 Pulses 1, 2a, 3a, 3b) in harsh automotive environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 85 V - Maximum continuous reverse operating voltage before clamping begins; defines safe operating margin below system nominal voltage. |
| VBR (min/max) | 94.4 V / 104 V - Breakdown voltage range at 1 mA test current; ensures reliable turn-on within defined tolerance band. |
| VC @ IPPM | 137 V at 21.9 A (10/1000 μs) - Clamping voltage during worst-case surge; determines maximum stress imposed on downstream circuitry. |
| PPPM | 3000 W (10/1000 μs) - Peak pulse power handling capability; validates suitability for high-energy automotive transients. |
| ESD Rating | 30 kV contact/air discharge (IEC 61000-4-2) - Confirms robustness against human-body-model electrostatic events in assembly and field use. |
| AEC-Q101 | Qualified - Certified for automotive underhood and powertrain applications requiring extended temperature cycling and reliability validation. |
| Package | SMC (DO-214AB) - Industry-standard surface-mount package with 90 °C/W thermal resistance (RthJA); compatible with automated PCB assembly. |
Pinout & Package
SMC3K85CAHM3_A uses the SMC (DO-214AB) package: a molded plastic case with matte tin-plated leads, UL 94 V-0 rated, MSL Level 1 compliant, and qualified to JESD 201 Class 2 whisker standard. Polarity is unmarked due to bidirectional construction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (K) | Anode-side terminal (unmarked) | One end of the bidirectional PN junction pair; functions as cathode during positive transients and anode during negative transients. |
| Anode (A) | Cathode-side terminal (unmarked) | Other end of the bidirectional PN junction pair; functions as anode during positive transients and cathode during negative transients. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or dual-polarity signal/power lines without external polarity management. |
| 3000 W (10/1000 μs) rating | Supports sustained suppression of high-energy load-dump transients in 12 V automotive systems per ISO 16750-2 Pulse b. |
| 137 V clamping at 21.9 A | Limits maximum voltage seen by protected ICs (e.g., CAN transceivers, microcontrollers) during ISO 7637-2 Pulse 1 and 2a events. |
| AEC-Q101 qualification | Validates reliability for automotive underhood applications including engine control modules, body controllers, and ADAS sensor hubs. |
| 30 kV ESD immunity | Meets IEC 61000-4-2 requirements for production handling and field operation in consumer and industrial environments. |
Applications
| Engine Control Unit (ECU) Power Input | CAN Bus Line Protection |
|---|---|
Use Scenario: Protects 12 V supply rail of engine control units against load dump transients (ISO 16750-2 Pulse b) and inductive switching spikes. IC Role / Device Role / Timing Role: Voltage-clamping TVS placed directly at ECU power entry point, shunting surge energy to ground before it reaches DC/DC converters and MCU power domains. Use Value: Limits input voltage to ≤137 V during 100 ms load dump events, preventing latch-up or permanent damage to 5 V/3.3 V regulators and microcontrollers. |
Use Scenario: Shields high-speed CAN FD transceivers (e.g., TJA1044, SN65HVD230) from ESD and coupled transients on differential bus lines. IC Role / Device Role / Timing Role: Bidirectional TVS connected across CAN_H and CAN_L, activated within <1 ns to clamp common-mode surges while preserving signal integrity. Use Value: Maintains CAN bus functionality after 30 kV ESD strikes and suppresses ISO 7637-2 Pulse 3a/b noise without distorting bit timing or causing bit errors. |
| Automotive Sensor Interface | Body Control Module (BCM) Inputs |
Use Scenario: Safeguards analog and digital outputs of pressure, temperature, and position sensors exposed to harness-induced transients in chassis-mounted modules. IC Role / Device Role / Timing Role: Low-capacitance TVS placed at sensor signal conditioning IC inputs (e.g., op-amps, ADC front-ends), referenced to local ground. Use Value: Prevents offset drift and saturation in precision amplifiers by limiting transient overvoltage to ≤137 V while maintaining sub-100 pF junction capacitance at 0 V bias. |
Use Scenario: Protects discrete switch inputs (e.g., door lock actuators, window lift motors) from inductive kickback and battery reversal events in BCM subsystems. IC Role / Device Role / Timing Role: Bidirectional TVS installed across each switched 12 V input line, absorbing reverse-polarity energy and forward surges simultaneously. Use Value: Eliminates need for separate polarity-reversal diodes and surge suppressors, reducing BOM count and PCB footprint in multi-channel input protection networks. |
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 | Same VWM (85 V), lower PPPM (400 W), SMA package (smaller size, higher RthJA = 150 °C/W). | Not AEC-Q101 qualified; limited to non-automotive industrial or consumer applications with lower surge energy demands. | Select only if space-constrained layouts and reduced surge levels (e.g., USB port protection) permit lower power rating. |
| SMCJ85CA | Same VWM (85 V), identical SMC package, but rated for 1500 W (10/1000 μs) - half the PPPM of SMC3K85CAHM3_A. | Lacks AEC-Q101 qualification and 30 kV ESD rating; suitable for cost-sensitive industrial controls but not automotive Tier-1 designs. | Choose when full 3000 W capability is unnecessary and lifecycle assurance for automotive deployment is not required. |
Compared with SMAJ85CA and SMCJ85CA, SMC3K85CAHM3_A provides triple the peak pulse power, automotive qualification, and industry-leading ESD immunity - making it the only option among the three validated for ISO 16750-2 load dump and ISO 7637-2 Pulse 1 compliance in safety-critical vehicle systems.
Availability
SMC3K85CAHM3_A is available at Aetrix Electronics and suitable for automotive ECUs, CAN bus nodes, sensor interface modules, and body control systems requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for SMC3K85CAHM3_A 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, rectifiers, and protection devices for automotive, industrial, and computing markets.
The SMC3KxxCAHM3_A series was developed specifically for AEC-Q101-compliant transient suppression in 12 V and 24 V automotive power networks, targeting robustness against load dump, ESD, and inductive switching events.
FAQ
What is the clamping voltage of SMC3K85CAHM3_A at its rated peak pulse current?
The SMC3K85CAHM3_A clamps to a maximum of 137 V at 21.9 A under the standard 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and confirmed in the Vishay datasheet (Document Number: 98241, Rev. 09-Jan-2024). The clamping performance ensures downstream components like CAN transceivers or microcontrollers remain within safe operating voltage limits during surge events. SMC3K85CAHM3_A maintains this specification across its full operating temperature range of –55 °C to +175 °C.
Is SMC3K85CAHM3_A qualified for automotive applications?
Yes, SMC3K85CAHM3_A is AEC-Q101 qualified and explicitly designed for automotive use. It meets ISO 7637-2 (Pulses 1, 2a, 3a, 3b) and ISO 16750-2 (Pulse b) transient immunity standards for 12 V battery systems. Its halogen-free, RoHS-compliant construction and JESD 201 Class 2 whisker resistance further validate its suitability for underhood and powertrain modules. SMC3K85CAHM3_A is listed in Vishay's official AEC-Q101 qualified products table.
What package type does SMC3K85CAHM3_A use, and what are its mounting characteristics?
SMC3K85CAHM3_A uses the SMC (DO-214AB) surface-mount package: 7.11 mm × 6.22 mm × 2.62 mm with matte tin-plated leads. It complies with J-STD-002 and JESD 22-B102 for solderability and is rated MSL Level 1 (peak reflow temperature 260 °C). The package supports automated placement and has a thermal resistance of 90 °C/W (junction-to-ambient) on standard FR4 PCBs. SMC3K85CAHM3_A requires no polarity marking due to its bidirectional configuration.
How does SMC3K85CAHM3_A perform under ESD stress?
SMC3K85CAHM3_A achieves 30 kV ESD immunity per IEC 61000-4-2 in both contact and air discharge modes - exceeding typical automotive and industrial requirements. This performance is enabled by its low dynamic impedance and optimized junction design. The device reliably suppresses ESD events without degradation, supporting robust handling in manufacturing and field environments. SMC3K85CAHM3_A maintains this rating across its full temperature range and lifetime, as verified in AEC-Q101 stress testing.
What is the maximum operating temperature for SMC3K85CAHM3_A?
The maximum junction temperature (TJ max.) for SMC3K85CAHM3_A is +175 °C, with a corresponding storage temperature range of –55 °C to +175 °C. This rating enables reliable operation in underhood automotive locations, such as near engines or exhaust manifolds, where ambient temperatures may exceed 125 °C. Derating curves in the datasheet confirm stable electrical performance up to TJ = 175 °C, and SMC3K85CAHM3_A retains full AEC-Q101 qualification across this range.
SMC3K85CAHM3_A/H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- TransZorb®
- 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):
- 21.9A
- Power - Peak Pulse:
- 3000W (3kW)
- 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-214AB (SMC)
SMC3K85CAHM3_A/H FAQ
1.How can I place an order for SMC3K85CAHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMC3K85CAHM3_A/H 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 SMC3K85CAHM3_A/H reliable?
The price and inventory of SMC3K85CAHM3_A/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMC3K85CAHM3_A/H is usually 5 days.
3.What payment methods are accepted for SMC3K85CAHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMC3K85CAHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMC3K85CAHM3_A/H?
SMC3K85CAHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMC3K85CAHM3_A/H 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 SMC3K85CAHM3_A/H?
For technical support, including SMC3K85CAHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMC3K85CAHM3_A/H requirements.
6.How does Aetrix verify that SMC3K85CAHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SMC3K85CAHM3_A/H 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 SMC3K85CAHM3_A/H meets industry standards.
7.What is the process for return or replacement of SMC3K85CAHM3_A/H?
All SMC3K85CAHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMC3K85CAHM3_A/H, 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 SMC3K85CAHM3_A/H part is unused and in its original packaging.
Return procedure for SMC3K85CAHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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