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Vishay General Semiconductor - Diodes Division SMCJ85AHM3_A/H
- Part No.:
- SMCJ85AHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ85AHM3_A/H.pdf
- Description:
- TVS DIODE 85VWM 137VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,346
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Product details
Overview
SMCJ85AHM3_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 85 V stand-off voltage (VWM), 94.4–104 V breakdown voltage (VBR) at 1 mA, 137 V maximum clamping voltage (VC) at 10.9 A peak pulse current (IPPM), and 1500 W peak pulse power (PPPM) with 10/1000 µs waveform - deployed in automotive power supply inputs and industrial sensor interfaces.
For engineers reviewing the SMCJ85AHM3_A/H datasheet, SMCJ85AHM3_A/H pinout, SMCJ85AHM3_A/H application, or SMCJ85AHM3_A/H equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, thermal resistance (RθJA = 75 °C/W), polarity marking convention, and halogen-free RoHS-compliant construction per JESD201 Class 2 whisker test.
Technical Context
This device operates as a unidirectional avalanche diode, leveraging glass-passivated junction technology to achieve sub-nanosecond response time and low incremental surge resistance. Its clamping behavior is defined under standardized 10/1000 µs surge conditions, with derating above 25 °C per Fig. 2 and validated thermal performance on 8.0 mm × 8.0 mm copper pads.
The SMCJ85AHM3_A/H is rated for -55 °C to +150 °C operating junction temperature, meets MSL Level 1 per J-STD-020 (peak reflow 260 °C), and carries AEC-Q101 qualification - confirming suitability for automotive electronics where reliability under repetitive transients is critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 85 V - maximum continuous reverse working voltage before clamping initiates; defines safe DC rail operating margin |
| VBR min/max | 94.4 V / 104 V at IT = 1 mA - guaranteed avalanche onset range; ensures predictable turn-on across production lot |
| VC @ IPPM | 137 V at 10.9 A - clamped voltage during 1500 W transient; determines protected circuit's maximum stress level |
| PPPM | 1500 W - peak pulse power handling with 10/1000 µs waveform; supports IEC 61000-4-5 Level 4 surge immunity |
| RθJA | 75 °C/W - junction-to-ambient thermal resistance on standard pad layout; informs derating for ambient >25 °C |
| TJ max | +150 °C - maximum junction temperature; enables operation in under-hood automotive environments |
| Package | SMC (DO-214AB) - surface-mount outline with 8.13 mm × 6.22 mm footprint; compatible with automated pick-and-place |
Pinout & Package
SMCJ85AHM3_A/H uses the SMC (DO-214AB) package: a molded plastic case with two coplanar matte tin-plated leads, polarity indicated by a cathode band on the unidirectional device. Mounting requires 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal per datasheet Fig. 6.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection point | Connected to ground or return path; forms current path during reverse-biased clamping event |
| Cathode | High-side connection point | Marked with band; connects to protected line (e.g., 12 V rail); conducts avalanche current when VIN exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, humidity bias, and mechanical shock per AEC specification |
| Halogen-free & RoHS-compliant | HM3 suffix denotes halogen-free molding compound and lead finish meeting JEDEC J-STD-609A Class 1 |
| MSL Level 1 rating | Unlimited floor life at ≤30 °C/60% RH; supports standard SMT reflow without baking preconditioning |
| Glass passivated junction | Enhances long-term stability and leakage control under high-humidity or high-temperature operating conditions |
| Low incremental surge resistance | Minimizes voltage overshoot during fast transients (e.g., ISO 7637-2 pulse 1/2a/5a), improving system-level ESD/surge margin |
Applications
| Automotive Power Input Protection | Industrial Sensor Signal Line Protection |
|---|---|
|
Use Scenario: 12 V battery-fed ECUs exposed to load dump (ISO 16750-2) and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and ground to clamp surges before reaching LDOs or microcontrollers. Use Value: Withstands 1500 W pulses and clamps to ≤137 V, preventing damage to downstream 16 V-rated regulators and logic ICs. |
Use Scenario: 4–20 mA current loop transmitters interfacing with PLC analog inputs in factory automation. IC Role / Device Role / Timing Role: TVS mounted across signal pair to suppress EFT bursts (IEC 61000-4-4) and induced lightning surges. Use Value: Low capacitance (<50 pF typical) avoids signal integrity degradation while providing 137 V clamping at 10.9 A. |
| Telecom DC Power Feeds | Consumer Power Adapter Outputs |
|
Use Scenario: -48 V telecom rectifier outputs feeding base station RF modules vulnerable to field-induced transients. IC Role / Device Role / Timing Role: Unidirectional TVS connected anode-to-ground to protect negative-rail circuits from positive-going surges. Use Value: 85 V VWM allows stable operation across -48 V ±10% tolerance while clamping to 137 V during 10/1000 µs events. |
Use Scenario: USB-C PD adapter 20 V output stage subject to user-induced hot-plug transients and cable ESD. IC Role / Device Role / Timing Role: TVS placed at output connector to limit voltage excursion into connected devices during fault conditions. Use Value: AEC-Q101 qualification ensures robustness across extended temperature and lifetime requirements beyond consumer grade. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ85AHE3/A | Same VWM (85 V) and VC (137 V), but lower PPPM (400 W) and smaller SMA package (DO-214AC) | Limited to lower-energy transients; unsuitable for ISO 16750-2 load dump compliance | Select when board space is constrained and surge energy is ≤400 W |
| SMCJ85AHE3_A/H | Identical electrical specs and SMC package, but RoHS-compliant commercial grade (E3) without halogen-free designation | No AEC-Q101 qualification; not approved for automotive production use | Choose for cost-sensitive industrial designs where automotive qualification is unnecessary |
Compared with SMCJ85AHM3_A/H, SMAJ85AHE3/A offers reduced surge capacity in a smaller footprint, while SMCJ85AHE3_A/H provides identical protection performance without halogen-free or AEC-Q101 assurance - making SMCJ85AHM3_A/H the only option qualified for automotive under-hood deployment.
Availability
SMCJ85AHM3_A/H is available at Aetrix Electronics and suitable for automotive power distribution units, industrial sensor interface modules, and telecom DC feed protection requiring stable component supply with full traceability and lifecycle management.
Supply support for SMCJ85AHM3_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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and application-specific performance.
The SMCJ series targets high-energy transient suppression in harsh environments; SMCJ85AHM3_A/H specifically addresses automotive and industrial needs where AEC-Q101 compliance, halogen-free materials, and 1500 W surge capability are mandatory.
FAQ
What is the clamping voltage of SMCJ85AHM3_A/H at its rated peak pulse current?
The SMCJ85AHM3_A/H has a maximum clamping voltage (VC) of 137 V at 10.9 A peak pulse current (IPPM), measured under standardized 10/1000 µs waveform conditions. This value defines the upper voltage limit imposed on protected circuitry during a full-power transient event and is confirmed in Table 1 of Vishay Document 88394. The SMCJ85AHM3_A/H maintains this clamping performance across its qualified operating temperature range.
Is SMCJ85AHM3_A/H qualified for automotive applications?
Yes, SMCJ85AHM3_A/H is AEC-Q101 qualified, as explicitly stated in the "Mechanical Data" section and footnote (1) of the Vishay datasheet (Document 88394). The HM3 suffix denotes halogen-free, RoHS-compliant construction with AEC-Q101 validation - enabling use in automotive powertrain, body control, and ADAS modules where reliability under thermal cycling and mechanical stress is required.
What does the "HM3" suffix indicate in SMCJ85AHM3_A/H?
The "HM3" suffix in SMCJ85AHM3_A/H specifies halogen-free, RoHS-compliant construction meeting JEDEC J-STD-609A Class 1, along with AEC-Q101 qualification. It distinguishes this variant from commercial-grade E3/M3 versions and confirms compliance with automotive environmental standards, including JESD201 Class 2 whisker resistance and MSL Level 1 reflow capability up to 260 °C.
How is polarity marked on SMCJ85AHM3_A/H?
SMCJ85AHM3_A/H is a unidirectional TVS diode with polarity indicated by a cathode band printed on the device body - consistent with DO-214AB package conventions. The banded end is the cathode and must be connected to the line being protected (e.g., +12 V rail), while the anode connects to ground. No marking appears on bidirectional variants, but SMCJ85AHM3_A/H is unidirectional per its "A" suffix and datasheet designation.
What is the thermal resistance of SMCJ85AHM3_A/H, and how does it affect derating?
The SMCJ85AHM3_A/H has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on 0.31" × 0.31" copper pads per terminal. This value directly governs power derating above 25 °C ambient: for example, at 85 °C ambient, maximum continuous power dissipation drops to ~3.3 W (calculated via linear derating curve in Fig. 2 of Document 88394). The SMCJ85AHM3_A/H remains functional up to +150 °C junction temperature.
SMCJ85AHM3_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):
- 85V
- Voltage - Breakdown (Min):
- 94.4V
- Voltage - Clamping (Max) @ Ipp:
- 137V
- Current - Peak Pulse (10/1000µs):
- 10.9A
- 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)
SMCJ85AHM3_A/H FAQ
1.How can I place an order for SMCJ85AHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ85AHM3_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 SMCJ85AHM3_A/H reliable?
The price and inventory of SMCJ85AHM3_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 SMCJ85AHM3_A/H is usually 5 days.
3.What payment methods are accepted for SMCJ85AHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ85AHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ85AHM3_A/H?
SMCJ85AHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ85AHM3_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 SMCJ85AHM3_A/H?
For technical support, including SMCJ85AHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ85AHM3_A/H requirements.
6.How does Aetrix verify that SMCJ85AHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SMCJ85AHM3_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 SMCJ85AHM3_A/H meets industry standards.
7.What is the process for return or replacement of SMCJ85AHM3_A/H?
All SMCJ85AHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ85AHM3_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 SMCJ85AHM3_A/H part is unused and in its original packaging.
Return procedure for SMCJ85AHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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