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Vishay General Semiconductor - Diodes Division SMCJ8.5AHM3/I
- Part No.:
- SMCJ8.5AHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ8.5AHM3/I.pdf
- Description:
- TVS DIODE 8.5VWM 14.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,187
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Product details
Overview
SMCJ8.5AHM3/I from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode designed for robust overvoltage protection in power rails and signal lines. It features a 8.5 V standoff voltage (VWM), 9.44–10.4 V breakdown voltage (VBR) at 1 mA, 1500 W peak pulse power (10/1000 μs), and clamps transients to ≤14.4 V at 104.2 A IPPM - deployed in automotive power supply inputs and industrial sensor interfaces.
For engineers reviewing the SMCJ8.5AHM3/I datasheet, SMCJ8.5AHM3/I pinout, SMCJ8.5AHM3/I application, or SMCJ8.5AHM3/I equivalent, key selection criteria include its AEC-Q101 qualification, halogen-free RoHS-compliant HM3 suffix, SMC (DO-214AB) package with cathode band polarity marking, and verified 1500 W surge capability under standardized IEC 61000-4-5 conditions.
Technical Context
This unidirectional TVS diode operates as a clamping device that remains non-conductive below 8.5 V and rapidly transitions to low-impedance conduction above its 9.44–10.4 V breakdown threshold. Its glass-passivated junction ensures stable leakage (<20 μA at VWM) and repeatable clamping performance across temperature (-55 °C to +150 °C).
Designed for high-energy transient suppression, it delivers 1500 W peak pulse power with <1 ns response time and low incremental surge resistance - validated under 10/1000 μs waveform per ANSI/IEEE C62.35. The SMC package supports automated placement and meets MSL level 1 (260 °C reflow peak).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.5 V - maximum reverse operating voltage before clamping begins; defines safe DC/AC working range |
| VBR (min/max) | 9.44 V / 10.4 V at 1 mA - precise breakdown threshold ensuring predictable turn-on during surges |
| VC @ IPPM | 14.4 V at 104.2 A - clamped voltage during full 1500 W surge; determines protected circuit's max stress level |
| PPPM | 1500 W - peak pulse power handling per 10/1000 μs waveform; certifies compliance with IEC 61000-4-5 Level 4 |
| ID @ VWM | ≤20 μA - ultra-low reverse leakage at rated standoff; preserves efficiency in battery-powered systems |
| TJ max. | +150 °C - extended junction temperature rating enabling use in under-hood automotive environments |
| Package | SMC (DO-214AB) - surface-mount outline with 8.0 mm × 8.0 mm copper pad thermal footprint per terminal |
Pinout & Package
SMCJ8.5AHM3/I uses the standard SMC (DO-214AB) package: molded epoxy case with matte tin-plated leads, cathode indicated by a band on the body. Terminals are anode and cathode; polarity is unidirectional only.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | High-side connection to protected line | Reverse-biased during normal operation; conducts surge current to ground when V > VBR |
| Anode | Ground reference node | Provides low-inductance return path for clamped surge current; must connect to solid ground plane |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per JESD22 |
| Halogen-free & RoHS-compliant (HM3) | Meets JEDEC J-STD-201 Class 2 whisker resistance and UL 94 V-0 flammability requirements |
| 1500 W peak pulse power | Withstands 10/1000 μs surges up to 104.2 A without degradation - suitable for ISO 7637-2 Pulse 5a/b |
| Glass-passivated junction | Ensures stable VBR tolerance (±5%), low leakage, and long-term parameter stability under thermal stress |
| MSL Level 1 (260 °C) | Compatible with standard lead-free reflow profiles without pre-baking; supports high-volume SMT assembly |
Applications
| Automotive Power Input Protection | Industrial Sensor Signal Line Protection |
|---|---|
|
Use Scenario: 12 V battery rail in engine control units exposed to load dump (ISO 16750-2) and alternator transients. IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed between input fuse and DC-DC converter input. Use Value: Limits voltage to ≤14.4 V during 1500 W surges, preventing damage to downstream LDOs and microcontrollers. |
Use Scenario: Analog output line (e.g., 4–20 mA loop) of pressure sensor in factory automation PLC modules. IC Role / Device Role / Timing Role: Low-capacitance TVS connected between signal and ground to suppress ESD and inductive switching noise. Use Value: Clamps fast transients while maintaining <20 μA leakage at 8.5 V, preserving signal accuracy and loop integrity. |
| Telecom DC Power Feeding | Consumer USB Power Port Protection |
|
Use Scenario: -48 V DC feeding line in remote radio head (RRH) base station equipment subject to lightning-induced surges. IC Role / Device Role / Timing Role: Primary TVS on input side of DC-DC converter, coordinated with secondary MOV and fuse. Use Value: Handles repetitive 10/1000 μs surges up to 1500 W without parametric shift, supporting telecom-grade MTBF targets. |
Use Scenario: VBUS line of USB Type-A port in smart home hub exposed to human-body-model ESD events. IC Role / Device Role / Timing Role: First-line transient suppressor placed immediately after connector, before USB controller IC. Use Value: Responds in <1 ns to clamp 8 kV contact ESD to <14.4 V, protecting USB PHY and avoiding system reset. |
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 SMA package (smaller footprint, lower PPPM = 400 W) | Limited to lower-energy surges (IEC 61000-4-2 only); unsuitable for ISO 7637-2 or lightning-level threats | Select when board space is constrained and surge threat level is limited to ESD or low-energy switching noise. |
| SMCJ8.5AHE3/I | Identical electrical specs and SMC package, but commercial-grade (non-AEC-Q101) and RoHS-compliant E3 suffix | Not qualified for automotive under-hood use; lacks AEC-Q101 test documentation and HM3 halogen-free assurance | Choose for cost-sensitive industrial or consumer designs where automotive qualification is not required. |
Compared with SMCJ8.5AHM3/I, SMAJ8.5AHE3/A trades 63% lower surge capacity for 40% smaller PCB area, while SMCJ8.5AHE3/I retains identical protection performance but omits AEC-Q101 validation and halogen-free compliance - making SMCJ8.5AHM3/I the sole choice for automotive-grade, high-reliability deployments.
Availability
SMCJ8.5AHM3/I is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor interfaces, and telecom power systems requiring stable component supply with guaranteed AEC-Q101 qualification and halogen-free compliance.
Supply support for SMCJ8.5AHM3/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 protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMCJ series is engineered for high-power transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where sustained surge immunity and long-term parameter stability are critical.
FAQ
What is the clamping voltage of SMCJ8.5AHM3/I at its rated peak pulse current?
The SMCJ8.5AHM3/I clamps to a maximum of 14.4 V at its rated peak pulse current of 104.2 A (10/1000 μs waveform). This value is measured under standardized test conditions with 8.0 mm × 8.0 mm copper pads per terminal and defines the upper voltage limit imposed on protected circuitry during worst-case transients. The clamping performance is guaranteed across the full operating temperature range of -55 °C to +150 °C.
Is SMCJ8.5AHM3/I suitable for automotive applications?
Yes, SMCJ8.5AHM3/I is AEC-Q101 qualified and specifically designed for automotive use. Its HM3 suffix denotes halogen-free, RoHS-compliant construction with full qualification per AEC-Q101 stress tests including temperature cycling, high-temperature reverse bias, and ESD. It is commonly deployed in engine control units, body control modules, and ADAS power supplies where ISO 7637-2 and ISO 16750-2 compliance is required.
What does the "HM3" suffix mean in SMCJ8.5AHM3/I?
The "HM3" suffix in SMCJ8.5AHM3/I indicates halogen-free, RoHS-compliant construction meeting JEDEC J-STD-201 Class 2 whisker resistance and UL 94 V-0 flammability standards. It also confirms AEC-Q101 qualification. The "I" denotes packaging in 13-inch tape-and-reel (3500 pcs/reel), while "H" would indicate 7-inch reel (850 pcs/reel). This suffix differentiates it from commercial-grade E3/M3 variants.
How does SMCJ8.5AHM3/I compare to bidirectional versions like SMCJ8.5CA?
SMCJ8.5AHM3/I is unidirectional and intended for DC line protection with defined polarity (cathode marked), whereas SMCJ8.5CA is bidirectional and used in AC or floating signal paths. Electrically, both share identical VWM (8.5 V), VBR (9.44–10.4 V), and VC (14.4 V), but the unidirectional version supports forward conduction and has lower leakage (<20 μA vs. <50 μA for CA types at same VWM). Polarity marking is essential for correct SMCJ8.5AHM3/I placement.
What is the thermal resistance of SMCJ8.5AHM3/I, and how does it affect layout?
The SMCJ8.5AHM3/I has a typical junction-to-lead thermal resistance (RθJL) of 15 °C/W and junction-to-ambient (RθJA) of 75 °C/W when mounted on minimum recommended 8.0 mm × 8.0 mm copper pads. To maintain safe operation at full 1500 W surge rating, PCB layout must provide adequate copper area and thermal vias - undersized pads increase junction temperature and reduce surge endurance. Derating curves in the datasheet guide thermal design for elevated ambient temperatures.
SMCJ8.5AHM3/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:
- 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/I FAQ
1.How can I place an order for SMCJ8.5AHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ8.5AHM3/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 SMCJ8.5AHM3/I reliable?
The price and inventory of SMCJ8.5AHM3/I 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/I is usually 5 days.
3.What payment methods are accepted for SMCJ8.5AHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ8.5AHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ8.5AHM3/I?
SMCJ8.5AHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ8.5AHM3/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 SMCJ8.5AHM3/I?
For technical support, including SMCJ8.5AHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ8.5AHM3/I requirements.
6.How does Aetrix verify that SMCJ8.5AHM3/I is sourced from the original manufacturer or authorized distributors?
All SMCJ8.5AHM3/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 SMCJ8.5AHM3/I meets industry standards.
7.What is the process for return or replacement of SMCJ8.5AHM3/I?
All SMCJ8.5AHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ8.5AHM3/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 SMCJ8.5AHM3/I part is unused and in its original packaging.
Return procedure for SMCJ8.5AHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ8.5AHM3/I Tags
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