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Vishay General Semiconductor - Diodes Division SMCJ8.5AHM3_A/H
- Part No.:
- SMCJ8.5AHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ8.5AHM3_A/H.pdf
- Description:
- TVS DIODE 8.5VWM 14.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:3,710
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Product details
Overview
SMCJ8.5AHM3_A/H from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, designed for robust overvoltage protection of DC power rails and signal lines. It features a 8.5 V stand-off voltage (VWM), 9.44–10.4 V breakdown voltage (VBR) at 1 mA, 14.4 V clamping voltage (VC) at 104.2 A peak pulse current (IPPM), and 1500 W peak pulse power (PPPM) with 10/1000 μs waveform.
For engineers reviewing the SMCJ8.5AHM3_A/H datasheet, SMCJ8.5AHM3_A/H pinout, SMCJ8.5AHM3_A/H application, or SMCJ8.5AHM3_A/H equivalent, this device is selected for automotive-grade surge protection where AEC-Q101 qualification, low clamping ratio, and halogen-free RoHS compliance are required in engine control units, infotainment power supplies, and sensor interface circuits.
Technical Context
The SMCJ8.5AHM3_A/H operates as a unidirectional avalanche diode, conducting only when reverse voltage exceeds its breakdown threshold to clamp transients. Its glass-passivated junction ensures stable VBR tolerance and low leakage (≤20 μA at VWM), while the SMC package provides thermal resistance of 15 °C/W (junction-to-lead) and supports 200 A non-repetitive forward surge current (IFSM).
It meets J-STD-020 MSL Level 1 with 260 °C reflow peak, uses matte tin-plated leads compliant with J-STD-002 and JESD 22-B102, and delivers 0.073 %/°C temperature coefficient of VBR - enabling predictable clamping behavior across -55 °C to +150 °C operating range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.5 V - maximum continuous reverse operating voltage before clamping begins; sets safe DC rail margin for 12 V systems. |
| VBR min/max | 9.44 V / 10.4 V at 1 mA - tight breakdown window ensures consistent turn-on across production lots and temperature. |
| VC @ IPPM | 14.4 V at 104.2 A - low clamping voltage limits stress on downstream ICs during 1500 W transient events. |
| PPPM | 1500 W - rated for 10/1000 μs surge waveform; supports ISO 7637-2 Pulse 1/2a/5a and IEC 61000-4-5 Level 4 immunity. |
| TJ max | +150 °C - enables use in under-hood automotive environments without derating below full power. |
| Package | SMC (DO-214AB) - industry-standard surface-mount outline with 8.0 mm × 8.0 mm copper pad thermal footprint per terminal. |
| Compliance | AEC-Q101 qualified, halogen-free, RoHS-compliant - certified for automotive electronics per Vishay HM3 suffix designation. |
Pinout & Package
SMCJ8.5AHM3_A/H uses the standard SMC (DO-214AB) package: molded plastic body with two coplanar gull-wing leads, cathode indicated by a band on the case. Thermal performance assumes mounting on 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current path (unidirectional conduction) | Connected to system ground or low-side return; defines polarity-sensitive placement on PCB. |
| Cathode | Protected line connection (reverse-biased during normal operation) | Connected to the line being protected (e.g., 12 V rail); conducts when transient exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| Low incremental surge resistance | Enables rapid energy absorption with minimal voltage overshoot during fast transients (e.g., load dump). |
| Glass passivated chip junction | Ensures long-term stability of VBR and leakage current under thermal cycling and humidity exposure. |
| MSL Level 1 rating | Supports single-reflow assembly without moisture sensitivity concerns - no baking required prior to SMT. |
| AEC-Q101 qualification | Validated for automotive applications including engine control, ADAS sensors, and body electronics. |
| Halogen-free construction | Meets automotive OEM material restrictions (e.g., GMW3172, Ford WSS-M99P9999-A1) and EU ELV Directive. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 12 V supply inputs in engine control modules against ISO 7637-2 load dump pulses up to 40 V/100 ms. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and LDO input to clamp surges before they reach voltage regulators. Use Value: Clamps to 14.4 V at 104 A, limiting regulator input stress to <15 V and preventing dropout or damage during 1500 W transients. |
Use Scenario: Safeguarding analog outputs of pressure/temperature sensors in factory automation PLC I/O modules. IC Role / Device Role / Timing Role: TVS mounted at connector entry point to absorb ESD (IEC 61000-4-2 ±8 kV contact) and inductive switching noise. Use Value: Sub-20 μA leakage at 8.5 V preserves sensor accuracy; 14.4 V clamping prevents op-amp saturation or ADC input damage. |
| Telecom DC Power Input Protection | Consumer Device USB Power Line Protection |
|
Use Scenario: Shielding 48 V PoE-powered equipment (e.g., IP cameras) from lightning-induced surges on Ethernet cables. IC Role / Device Role / Timing Role: Primary TVS on secondary-side DC bus after isolation, coordinated with upstream GDT or MOV. Use Value: 1500 W PPPM handles high-energy surges; 0.073 %/°C VBR drift maintains clamping margin across outdoor ambient ranges. |
Use Scenario: Adding surge resilience to 5 V USB Type-C power delivery paths in portable speakers or docking stations. IC Role / Device Role / Timing Role: Unidirectional TVS placed between USB PD controller and VBUS switch to protect against hot-plug transients. Use Value: 8.5 V VWM allows full 5 V operation with headroom; SMC package fits compact layouts without compromising 104 A surge capacity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ8.5AHE3/A | Same VWM/VBR/VC specs but in smaller SMA (DO-214AC) package; lower PPPM (400 W) and IPPM (32.9 A). | Limited to lower-energy transients (e.g., ESD-only); unsuitable for load dump or IEC 61000-4-5. | Select when board space is constrained and surge threat level is ≤400 W. |
| SMCJ8.5AHE3_A/H | Identical electrical specs and SMC package, but commercial-grade (non-AEC-Q101) and RoHS-compliant without halogen-free certification. | Approved for industrial/commercial use only; not validated for automotive temperature cycling or lifetime reliability testing. | Select for cost-sensitive non-automotive designs where AEC-Q101 and halogen-free are not mandated. |
Compared with SMCJ8.5AHM3_A/H, SMAJ8.5AHE3/A trades surge capacity for footprint reduction, while SMCJ8.5AHE3_A/H retains identical protection performance but omits automotive qualification and halogen-free compliance - making the HM3 variant uniquely suited for Tier-1 automotive supply chains requiring both certifications.
Availability
SMCJ8.5AHM3_A/H is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor interfaces, telecom power inputs, and consumer USB power line protection requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMCJ8.5AHM3_A/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, rectifiers, MOSFETs, and protection devices with emphasis on reliability, precision, and application-specific validation.
The SMCJ series is engineered for high-energy transient suppression in harsh environments, targeting automotive, industrial, and telecom applications where AEC-Q101 qualification, stable clamping, and thermal robustness are critical.
FAQ
What is the clamping voltage of the SMCJ8.5AHM3_A/H under maximum surge conditions?
The SMCJ8.5AHM3_A/H has a maximum clamping voltage (VC) of 14.4 V at 104.2 A peak pulse current (IPPM), measured with a 10/1000 μs waveform. This value ensures downstream components see limited overvoltage during standardized surge events like ISO 7637-2 Pulse 5a. The clamping performance is guaranteed across the full operating temperature range (-55 °C to +150 °C) and is directly verified in Vishay's characterization data for the SMCJ8.5AHM3_A/H.
Is the SMCJ8.5AHM3_A/H suitable for automotive applications?
Yes, the SMCJ8.5AHM3_A/H is AEC-Q101 qualified and carries the HM3 suffix, indicating halogen-free, RoHS-compliant, and automotive-grade construction. It is specifically validated for under-hood and chassis-mounted applications including engine control units, body control modules, and ADAS sensor power supplies. The SMCJ8.5AHM3_A/H meets all stress tests defined in AEC-Q101, including temperature cycling, humidity bias HAST, and mechanical shock.
How does the SMCJ8.5AHM3_A/H differ from the commercial-grade SMCJ8.5AHE3_A/H?
The SMCJ8.5AHM3_A/H differs from SMCJ8.5AHE3_A/H in three key ways: it is halogen-free (vs. standard RoHS), AEC-Q101 qualified (vs. commercial grade), and carries the HM3 ordering code. Electrically and thermally, both share identical VWM (8.5 V), VBR (9.44–10.4 V), VC (14.4 V), and SMC package. The SMCJ8.5AHM3_A/H is intended for automotive OEMs requiring full material compliance and qualification evidence, whereas SMCJ8.5AHE3_A/H serves industrial and consumer markets.
What is the thermal resistance and maximum junction temperature of the SMCJ8.5AHM3_A/H?
The SMCJ8.5AHM3_A/H has a typical junction-to-lead thermal resistance (RθJL) of 15 °C/W and a maximum operating junction temperature (TJ max) of +150 °C. When mounted on the recommended 0.31" × 0.31" copper pads per terminal, it achieves sufficient heat dissipation to sustain its 6.5 W steady-state power dissipation at TA = 50 °C. This thermal profile allows reliable operation in sealed enclosures or high-ambient environments common in automotive and industrial settings - a key design parameter confirmed for the SMCJ8.5AHM3_A/H in Vishay's thermal characterization data.
Does the SMCJ8.5AHM3_A/H have polarity marking, and how is it oriented on the PCB?
Yes, the SMCJ8.5AHM3_A/H is unidirectional and features a cathode band marked on the case - the banded end connects to the protected line (e.g., 12 V rail), while the unbanded end connects to ground. This orientation ensures proper reverse-bias operation during normal conditions and forward conduction into ground during overvoltage events. The SMCJ8.5AHM3_A/H follows standard DO-214AB polarity conventions, and incorrect placement will prevent clamping functionality - verified in Vishay's mechanical drawings and application notes for the SMCJ8.5AHM3_A/H.
SMCJ8.5AHM3_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:
- 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_A/H FAQ
1.How can I place an order for SMCJ8.5AHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ8.5AHM3_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 SMCJ8.5AHM3_A/H reliable?
The price and inventory of SMCJ8.5AHM3_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 SMCJ8.5AHM3_A/H is usually 5 days.
3.What payment methods are accepted for SMCJ8.5AHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ8.5AHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ8.5AHM3_A/H?
SMCJ8.5AHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ8.5AHM3_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 SMCJ8.5AHM3_A/H?
For technical support, including SMCJ8.5AHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ8.5AHM3_A/H requirements.
6.How does Aetrix verify that SMCJ8.5AHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SMCJ8.5AHM3_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 SMCJ8.5AHM3_A/H meets industry standards.
7.What is the process for return or replacement of SMCJ8.5AHM3_A/H?
All SMCJ8.5AHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ8.5AHM3_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 SMCJ8.5AHM3_A/H part is unused and in its original packaging.
Return procedure for SMCJ8.5AHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ8.5AHM3_A/H Tags
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