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Vishay General Semiconductor - Diodes Division SMC3K85CAHM3_A/I
- Part No.:
- SMC3K85CAHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMC3K85CAHM3_A/I.pdf
- Description:
- 3KW, 85V 5%,BIDIR,SMC TVS
- Quantity:
- Payment:
- Shipping:
Inventory:6,886
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Product details
Overview
SMC3K85CAHM3_A from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) in SMC (DO-214AB) package, designed for high-energy surge protection with 3000 W peak pulse power (10/1000 μs), 85 V stand-off voltage (VWM), and 137 V clamping voltage (VC) at 21.9 A IPPM. It protects automotive sensor signal lines, MOSFET gates, and IC power rails against ISO 7637-2 and ISO 16750-2 transients.
For engineers reviewing the SMC3K85CAHM3_A datasheet, SMC3K85CAHM3_A pinout, SMC3K85CAHM3_A application, or SMC3K85CAHM3_A equivalent, key selection criteria include its AEC-Q101 qualification, 30 kV ESD immunity per IEC 61000-4-2, bidirectional clamping behavior, and compatibility with 12 V automotive battery systems under load dump and switching transient conditions.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: when reverse voltage exceeds its breakdown threshold (94.4–104 V), it avalanches rapidly to limit transient energy across protected circuit nodes. Its low incremental surge resistance ensures minimal voltage overshoot during 8/20 μs surges up to 177 A.
The device features thermally robust construction with 175 °C max junction temperature, MSL Level 1 moisture sensitivity, and halogen-free, RoHS-compliant molding compound. Its matte tin-plated leads meet J-STD-002 solderability and JESD 201 Class 2 whisker resistance requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 85 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC/AC bias margin for protected line. |
| VBR min/max | 94.4 V / 104 V - Breakdown occurs within this range at 1 mA test current; ensures consistent turn-on across production lots. |
| VC @ IPPM | 137 V at 21.9 A (10/1000 μs) - Clamped voltage seen by downstream circuit during worst-case surge; determines residual stress on protected IC. |
| PPPM | 3000 W - Peak pulse power handling capability with 10/1000 μs waveform; supports high-energy automotive transients like ISO 7637-2 Pulse 1. |
| ESD rating | ±30 kV (IEC 61000-4-2 contact/air) - Withstands human-body-model electrostatic discharge without degradation; eliminates need for external ESD staging. |
| TJ max | +175 °C - Enables operation in under-hood automotive environments and high-power industrial enclosures without thermal derating penalties. |
| Package | SMC (DO-214AB) - Standardized surface-mount outline with 7.11 mm × 6.22 mm footprint and 2.62 mm height; compatible with automated pick-and-place and reflow. |
Pinout & Package
SMC (DO-214AB) package: bidirectional device with no polarity marking; cathode/anode terminals are functionally symmetric. Two-terminal construction simplifies PCB layout and eliminates orientation errors during assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (A) | Transient current sink (reverse-biased path) | Connects to protected line; conducts surge current to ground or rail when voltage exceeds VBR in either polarity. |
| Cathode (K) | Transient current sink (reverse-biased path) | Connects to reference node (GND or VCC); completes low-impedance shunt path during overvoltage event. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Protects AC-coupled or floating signal lines (e.g., CAN differential pairs, sensor bridges) without polarity constraints. |
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, humidity bias, and mechanical shock-enables use in ADAS and powertrain ECUs. |
| 30 kW surge rating (8/20 μs) | Withstands high-current lightning-induced surges per IEC 61000-4-5; clamps at 177 V with 169 A peak current. |
| UL 497B recognition (E136766) | Meets safety standards for telecom and industrial interface protection; supports regulatory certification of end equipment. |
| MSL Level 1, 260 °C peak reflow | Compatible with standard lead-free reflow profiles without preconditioning; reduces manufacturing complexity and cost. |
Applications
| Automotive Sensor Protection | Industrial Motor Drive Inputs |
|---|---|
Use Scenario: Protecting analog output lines of pressure, temperature, and position sensors in engine control modules exposed to ISO 7637-2 Pulse 1 (−150 V) and Pulse 3b (+150 V). IC Role / Device Role / Timing Role: Shunt TVS placed between sensor output and ECU input to clamp transients before they reach precision ADC front-end. Use Value: Prevents sensor signal corruption and ADC saturation during inductive load switching; maintains measurement integrity over full vehicle lifetime. |
Use Scenario: Safeguarding digital input pins of motor drive controllers connected to external limit switches and emergency stop circuits subject to 200 V/1 ms surges. IC Role / Device Role / Timing Role: Fast-response voltage clamp on 24 V logic inputs to absorb energy from relay coil flyback and field wiring coupling. Use Value: Eliminates false triggering and microcontroller resets; extends system uptime in factory automation environments. |
| Telecom Line Interface | Power Supply Input Stage |
Use Scenario: Guarding RS-485 transceiver bus lines in outdoor base stations subjected to lightning-induced surges per IEC 61000-4-5 (8/20 μs). IC Role / Device Role / Timing Role: Bidirectional TVS placed across differential pair to suppress common-mode and differential-mode transients simultaneously. Use Value: Maintains data integrity at 10 Mbps rates; avoids communication lockup during thunderstorm events. |
Use Scenario: Front-end protection for 12 V DC-DC converter inputs in automotive infotainment systems facing ISO 16750-2 Pulse b (load dump up to +120 V). IC Role / Device Role / Timing Role: Primary surge limiter upstream of input filter capacitor and controller IC to prevent overvoltage damage. Use Value: Absorbs 3000 W transient energy without failure; enables single-stage protection architecture and smaller BOM count. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ85CA | Lower PPPM (600 W), same VWM (85 V), higher VC (139 V at 12.1 A), SMB package (smaller footprint, lower thermal mass) | Not rated for AEC-Q101; limited to consumer/industrial use; insufficient for automotive load dump per ISO 16750-2 | Select when space-constrained and surge energy is ≤600 W; verify thermal design with RthJA = 120 °C/W. |
| 1.5KE85CA | Higher PPPM (1500 W), axial-leaded DO-201 package, higher leakage (5 μA vs. 1 μA), no AEC-Q101 or MSL Level 1 rating | Requires through-hole assembly; unsuitable for automated SMT lines or high-reliability automotive programs | Choose only for legacy board redesigns where SMT is unavailable; avoid for new automotive designs. |
Compared with SMBJ85CA and 1.5KE85CA, SMC3K85CAHM3_A delivers triple the pulse power handling, automotive-grade qualification, and surface-mount compatibility-making it the sole option meeting full ISO 7637-2/16750-2 compliance in compact SMC form factor.
Availability
SMC3K85CAHM3_A is available at Aetrix Electronics and suitable for automotive ECU design, industrial motor control, telecom infrastructure, and power supply input protection requiring stable component supply and long-term lifecycle support.
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 engineered specifically for AEC-Q101-compliant transient suppression in harsh automotive environments, emphasizing high pulse power density, low clamping ratio, and robust process-controlled avalanche characteristics.
FAQ
What is the maximum clamping voltage of SMC3K85CAHM3_A under a 10/1000 μs surge?
The SMC3K85CAHM3_A clamps to 137 V at 21.9 A peak pulse current (IPPM) when subjected to a 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and represents the maximum voltage imposed on the protected circuit during standardized surge testing. The clamping performance is guaranteed across the full operating temperature range and remains stable after repeated surge events, as validated in AEC-Q101 stress testing.
Is SMC3K85CAHM3_A qualified for automotive applications?
Yes, SMC3K85CAHM3_A is fully AEC-Q101 qualified, having passed stress tests including temperature cycling, high-temperature operating life, and unbiased highly accelerated stress testing. It meets automotive-specific requirements for surge immunity (ISO 7637-2 and ISO 16750-2), ESD robustness (IEC 61000-4-2 ±30 kV), and manufacturing reliability (MSL Level 1, JESD 201 Class 2). These qualifications make SMC3K85CAHM3_A suitable for use in engine control units, ADAS sensors, and body electronics.
What is the standoff voltage (VWM) and why does it matter for SMC3K85CAHM3_A?
The standoff voltage (VWM) of SMC3K85CAHM3_A is 85 V - the maximum continuous reverse voltage the device can withstand without entering avalanche conduction. This parameter ensures reliable operation under normal system conditions while providing sufficient margin below the breakdown voltage (94.4–104 V). Selecting a VWM ≥10 % above the maximum steady-state line voltage prevents nuisance conduction and leakage-related power loss, which is critical in always-on automotive modules.
How does SMC3K85CAHM3_A compare to unidirectional TVS diodes in circuit protection?
SMC3K85CAHM3_A is bidirectional, meaning it provides symmetrical clamping for both positive and negative transients - essential for protecting AC-coupled interfaces like CAN, LIN, or sensor bridges. Unidirectional TVS diodes only clamp in one polarity and require correct orientation; misplacement causes failure. The bidirectional nature of SMC3K85CAHM3_A eliminates assembly errors and supports floating or differential signal paths without additional polarity logic or external components.
What packaging options are available for SMC3K85CAHM3_A?
SMC3K85CAHM3_A is supplied in 13-inch plastic tape and reel format with a base quantity of 3500 units per reel (I suffix). The device uses matte tin-plated leads compatible with lead-free reflow soldering per J-STD-002, and the SMC (DO-214AB) package conforms to JEDEC standards for thermal and mechanical performance. Tape-and-reel packaging ensures compatibility with high-speed SMT placement equipment and supports automated manufacturing workflows.
SMC3K85CAHM3_A/I 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:
- Telecom
- 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/I FAQ
1.How can I place an order for SMC3K85CAHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMC3K85CAHM3_A/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 SMC3K85CAHM3_A/I reliable?
The price and inventory of SMC3K85CAHM3_A/I 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/I is usually 5 days.
3.What payment methods are accepted for SMC3K85CAHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMC3K85CAHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMC3K85CAHM3_A/I?
SMC3K85CAHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMC3K85CAHM3_A/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 SMC3K85CAHM3_A/I?
For technical support, including SMC3K85CAHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMC3K85CAHM3_A/I requirements.
6.How does Aetrix verify that SMC3K85CAHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMC3K85CAHM3_A/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 SMC3K85CAHM3_A/I meets industry standards.
7.What is the process for return or replacement of SMC3K85CAHM3_A/I?
All SMC3K85CAHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMC3K85CAHM3_A/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 SMC3K85CAHM3_A/I part is unused and in its original packaging.
Return procedure for SMC3K85CAHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMC3K85CAHM3_A/I Tags
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DESD3V3E1BL-7B
Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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D12V0L1B2LP-7B
Diodes Incorporated
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Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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