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Vishay General Semiconductor - Diodes Division SMCJ8.5AHM3/H
- Part No.:
- SMCJ8.5AHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ8.5AHM3/H.pdf
- Description:
- TVS DIODE 8.5VWM 14.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,540
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Product details
Overview
SMCJ8.5AHM3/H from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMC (DO-214AB) package, designed for clamping voltage transients on power and signal lines. It features a 8.5 V stand-off voltage (VWM), 9.44–10.4 V breakdown voltage (VBR) at 1 mA test current, 1500 W peak pulse power (10/1000 μs), and clamps to ≤14.4 V at 104.2 A peak surge current - used in automotive ECUs, industrial sensor interfaces, and DC power rail protection.
For engineers reviewing the SMCJ8.5AHM3/H datasheet, SMCJ8.5AHM3/H pinout, SMCJ8.5AHM3/H application, or SMCJ8.5AHM3/H equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification (HM3 suffix), halogen-free RoHS compliance, 1500 W surge rating, and SMC package thermal performance with RθJA = 75 °C/W.
Technical Context
This TVS diode operates as a clamping device in parallel with protected circuitry, entering avalanche conduction when reverse voltage exceeds VBR. Its glass-passivated junction ensures stable breakdown and low leakage (<20 μA at VWM), while the SMC package supports automated placement and meets MSL level 1 (260 °C reflow peak).
Designed for single-pulse transient suppression per IEC 61000-4-5 (10/1000 μs waveform), it delivers fast response time (<1.0 ps), low incremental surge resistance, and thermal stability up to TJ = 150 °C - enabling use in harsh environments where reliability under repetitive surges is critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.5 V - maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 9.44 V / 10.4 V at IT = 1 mA - defines reliable avalanche onset window for design margining |
| VC @ IPPM | ≤14.4 V at 104.2 A - clamped voltage seen by downstream ICs during worst-case surge |
| PPPM | 1500 W (10/1000 μs) - peak transient energy absorption capability without failure |
| ID @ VWM | ≤20 μA - low leakage preserves efficiency in battery-powered or high-impedance circuits |
| TJ max | +150 °C - enables operation in under-hood automotive or industrial enclosures |
| Package | SMC (DO-214AB) - industry-standard 2-pin surface-mount outline with 7.75 mm × 6.22 mm footprint |
Pinout & Package
SMCJ8.5AHM3/H uses the standard SMC (DO-214AB) package: two-terminal, unidirectional configuration with cathode marked by a band on the body. The device mounts on 8.0 mm × 8.0 mm copper pads per terminal for rated thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink | Connected to protected line; conducts avalanche current to ground during overvoltage events |
| Anode | Reference node | Typically tied to system ground or low-impedance return path to complete clamping loop |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD stress |
| Halogen-free & RoHS-compliant | Meets environmental compliance requirements for modern automotive and industrial manufacturing |
| Low incremental surge resistance | Enables tighter VC/VBR ratio (14.4 V / 9.44 V ≈ 1.52), minimizing voltage overshoot during clamping |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard reflow without baking - simplifies SMT production |
| Glass passivated junction | Ensures stable VBR over lifetime and improved resistance to humidity-induced parameter drift |
Applications
| Automotive Body Control Module (BCM) | Industrial CAN Transceiver Protection |
|---|---|
Use Scenario: Protects 12 V supply rails in BCMs from load dump and inductive switching spikes. IC Role / Device Role / Timing Role: Unidirectional TVS placed between VBAT and GND, clamping transients before they reach MCU and driver ICs. Use Value: Withstands 1500 W surges and maintains ≤14.4 V clamping, preventing latch-up or damage to 5 V/3.3 V logic supplies downstream. |
Use Scenario: Shields CANH/CANL differential pair inputs from ESD and cable discharge events in factory automation nodes. IC Role / Device Role / Timing Role: Paired unidirectional SMCJ8.5AHM3/H devices on each line (CANH-to-GND, CANL-to-GND) provide symmetric transient immunity. Use Value: 104.2 A surge handling and <1.0 ps response ensure CAN bus integrity remains intact during 8 kV contact ESD per ISO 10605. |
| DC-DC Converter Input Stage | Smart Sensor Signal Conditioning |
Use Scenario: Guards input capacitors and controller ICs in 24 V industrial DC-DC converters against back-EMF from relay coils or motor drivers. IC Role / Device Role / Timing Role: Mounted directly at converter input terminals to shunt surge energy before filtering stages. Use Value: 8.5 V VWM allows compatibility with 24 V nominal systems using 30 V-rated components; 1500 W rating covers IEC 61000-4-5 Level 4 surges. |
Use Scenario: Protects analog front-end of 4–20 mA or 0–10 V industrial sensors exposed to field wiring transients. IC Role / Device Role / Timing Role: Placed across sensor output line and local ground to clamp induced surges without affecting signal fidelity. Use Value: Low 20 μA leakage at 8.5 V avoids loading high-impedance sensor outputs; SMC package enables compact PCB layout near connectors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ8.5AHE3/A | Same VWM/VBR/VC specs but SMA package (smaller footprint, lower PPPM = 400 W) | Limited to lower-energy transients; unsuitable for IEC 61000-4-5 Level 4 or automotive load dump | Select only when space-constrained and surge energy is ≤400 W |
| SMCJ8.5AHE3/H | Identical electrical specs but commercial-grade (E3), not AEC-Q101 qualified or halogen-free | Not approved for automotive production; lacks extended temperature validation and material compliance | Use only in non-automotive industrial or consumer designs where qualification is not required |
Compared with SMCJ8.5AHM3/H, SMAJ8.5AHE3/A sacrifices 73% peak power handling for 30% smaller board area, while SMCJ8.5AHE3/H retains full SMC performance but omits automotive qualification and halogen-free status - making SMCJ8.5AHM3/H the sole choice for AEC-Q101-compliant, high-energy, environmentally compliant designs.
Availability
SMCJ8.5AHM3/H is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor interfaces, and DC power rail protection requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for SMCJ8.5AHM3/H 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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and application-specific performance.
The SMCJ series targets high-energy transient suppression in automotive, industrial, and telecom infrastructure - engineered for robustness under extreme surge conditions and validated to AEC-Q101 for mission-critical deployment.
FAQ
What does the "HM3" suffix indicate in SMCJ8.5AHM3/H?
The HM3 suffix in SMCJ8.5AHM3/H denotes halogen-free, RoHS-compliant construction and AEC-Q101 qualification. It confirms the device meets automotive reliability standards including temperature cycling, highly accelerated life testing, and ESD robustness - distinguishing it from commercial-grade variants like SMCJ8.5AHE3/H.
Can SMCJ8.5AHM3/H be used in bidirectional configurations?
No - SMCJ8.5AHM3/H is strictly unidirectional, as indicated by the "A" (not "CA") suffix and cathode band marking. For bidirectional protection, Vishay specifies part numbers ending in "CA", such as SMCJ8.5CA. Using SMCJ8.5AHM3/H in reverse-biased mode risks permanent breakdown due to lack of symmetrical avalanche structure.
What is the maximum clamping voltage of SMCJ8.5AHM3/H at its rated surge current?
The maximum clamping voltage (VC) of SMCJ8.5AHM3/H is 14.4 V when subjected to its rated peak pulse current (IPPM) of 104.2 A under the standard 10/1000 μs waveform. This value is guaranteed per Vishay's datasheet and defines the upper voltage limit imposed on protected circuitry during transient events.
How does the SMC package of SMCJ8.5AHM3/H improve thermal performance versus SMA?
The SMC (DO-214AB) package of SMCJ8.5AHM3/H provides significantly better thermal dissipation than SMA: RθJA = 75 °C/W (vs. ~150 °C/W for SMA), enabling higher sustained power handling. Its larger copper pad area (8.0 mm × 8.0 mm per terminal) and lower junction-to-lead resistance (RθJL = 15 °C/W) allow safe operation at 1500 W peak pulses without exceeding TJ = 150 °C.
Is SMCJ8.5AHM3/H compatible with lead-free reflow processes?
Yes - SMCJ8.5AHM3/H is rated for MSL Level 1 per J-STD-020 and supports peak reflow temperatures up to 260 °C. Its matte tin-plated leads comply with J-STD-002 and JESD 22-B102 solderability standards, and the halogen-free molding compound ensures compatibility with lead-free assembly without delamination or voiding risks.
SMCJ8.5AHM3/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:
- Discontinued at Digi-Key
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 8.5V
- Voltage - Breakdown (Min):
- 9.44V
- Voltage - Clamping (Max) @ Ipp:
- 14.4V
- Current - Peak Pulse (10/1000µs):
- 104.2A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
SMCJ8.5AHM3/H FAQ
1.How can I place an order for SMCJ8.5AHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ8.5AHM3/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 SMCJ8.5AHM3/H reliable?
The price and inventory of SMCJ8.5AHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ8.5AHM3/H is usually 5 days.
3.What payment methods are accepted for SMCJ8.5AHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ8.5AHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ8.5AHM3/H?
SMCJ8.5AHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ8.5AHM3/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 SMCJ8.5AHM3/H?
For technical support, including SMCJ8.5AHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ8.5AHM3/H requirements.
6.How does Aetrix verify that SMCJ8.5AHM3/H is sourced from the original manufacturer or authorized distributors?
All SMCJ8.5AHM3/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 SMCJ8.5AHM3/H meets industry standards.
7.What is the process for return or replacement of SMCJ8.5AHM3/H?
All SMCJ8.5AHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ8.5AHM3/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 SMCJ8.5AHM3/H part is unused and in its original packaging.
Return procedure for SMCJ8.5AHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ8.5AHM3/H Tags
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