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Vishay General Semiconductor - Diodes Division SMCJ85AHM3_A/I
- Part No.:
- SMCJ85AHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ85AHM3_A/I.pdf
- Description:
- TVS DIODE 85VWM 137VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:7,994
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Product details
Overview
SMCJ85AHM3_A/I from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, designed for high-energy surge protection on DC power rails and signal lines. It features a 85 V stand-off voltage (VWM), 137 V maximum clamping voltage (VC) at 10.9 A peak pulse current (IPPM), and 1500 W peak pulse power dissipation (PPPM) under 10/1000 µs waveform - deployed in automotive power supply inputs and industrial sensor interfaces.
For engineers reviewing the SMCJ85AHM3_A/I datasheet, SMCJ85AHM3_A/I pinout, SMCJ85AHM3_A/I application, or SMCJ85AHM3_A/I equivalent, key selection criteria include clamping performance at rated surge current, AEC-Q101 qualification status, halogen-free RoHS compliance, and thermal resistance (RθJA = 75 °C/W) for board-level thermal design validation.
Technical Context
The SMCJ85AHM3_A/I operates as a unidirectional avalanche diode with glass-passivated junction, delivering fast response (<1 ns) to transients induced by inductive switching or ESD events. Its breakdown voltage (VBR) is specified at 94.4–104 V (min/max) with 1 mA test current, and it exhibits a temperature coefficient of VBR at +0.106 %/°C.
Designed for surface-mount automated placement, it meets MSL level 1 per J-STD-020 (peak reflow 260 °C), has matte tin-plated leads solderable per J-STD-002, and supports operation from –55 °C to +150 °C junction temperature. The cathode band denotes polarity; no marking on bidirectional variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 85 V - maximum continuous reverse operating voltage before clamping begins |
| VBR (min/max) | 94.4 V / 104 V at 1 mA - ensures reliable avalanche initiation within defined tolerance band |
| VC @ IPPM | 137 V at 10.9 A - clamping voltage limits downstream IC stress during 10/1000 µs surge |
| PPPM | 1500 W - peak transient energy absorption capability under standardized waveform |
| RθJA | 75 °C/W - thermal resistance from junction to ambient, critical for derating above 25 °C |
| TJ max. | +150 °C - maximum allowable junction temperature for sustained reliability |
| Package | SMC (DO-214AB) - industry-standard 2-pin surface-mount outline with 8.0 mm × 8.0 mm copper pad thermal requirement |
Pinout & Package
Package: SMC (DO-214AB), molded epoxy case meeting UL 94 V-0 flammability rating; terminals are matte tin-plated, solderable per J-STD-002; cathode indicated by band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias | Connected to lower-potential side (e.g., ground or return path) in unidirectional TVS configuration |
| Cathode | Current exit terminal in forward bias; protected line connection in reverse-bias clamping | Connected to the line being protected (e.g., 85 V rail); band-marked end defines polarity |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per AEC standard |
| Halogen-free & RoHS-compliant | HM3 suffix confirms halogen-free molding compound and full RoHS compliance for green manufacturing |
| Low incremental surge resistance | Enables tighter clamping (137 V at 10.9 A) versus higher-resistance alternatives, reducing voltage overshoot |
| Very fast response time | <1 ns turn-on ensures suppression before sensitive downstream circuitry experiences overvoltage |
| MSL Level 1 | Supports lead-free reflow up to 260 °C without moisture-induced damage during assembly |
Applications
| Automotive Power Input Protection | Industrial Sensor Signal Line Protection |
|---|---|
Use Scenario: 12 V/24 V battery-fed ECUs exposed to load dump (ISO 7637-2 Pulse 5a) and jump-start surges. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and ground to clamp transients before they reach PMIC or MCU input. Use Value: Withstands 1500 W peak pulse and clamps to ≤137 V, protecting downstream regulators rated for 36 V absolute max input. | Use Scenario: Analog output lines (e.g., 4–20 mA current loop) in factory automation sensors subject to cable-induced ESD and inductive kickback. IC Role / Device Role / Timing Role: Bidirectional-capable variant not used; this unidirectional device protects grounded-signal paths where polarity is fixed. Use Value: 10.9 A IPPM rating handles typical IEC 61000-4-5 combination wave surges without degradation. |
| Telecom DC Power Feeds | Consumer Device USB Power Input |
Use Scenario: -48 V telecom rectifier outputs feeding base station subsystems vulnerable to lightning-induced surges on long feed lines. IC Role / Device Role / Timing Role: Primary overvoltage clamp on input stage, coordinated with upstream fuses and secondary filtering. Use Value: 85 V VWM allows margin above nominal -48 V (|48| V), while 137 V VC stays below isolation barrier ratings. | Use Scenario: USB-C PD input stages in portable monitors or docking stations subjected to hot-plug transients and accidental 20 V misapplication. IC Role / Device Role / Timing Role: First-line clamping device on VBUS line, placed before buck converter and port controller. Use Value: Halogen-free HM3 construction supports consumer product environmental compliance; 1500 W PPPM exceeds USB PD 3.0 surge requirements. |
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/H | Lower PPPM (400 W), smaller SMA package (DO-214AC), same VWM/VBR range | Not suitable for 1500 W surge environments; limited to low-energy signal lines | Select only when board space is constrained and surge threat level is ≤400 W |
| SMCJ85A-M3/57T | Same electrical specs and SMC package, but commercial-grade (non-AEC-Q101), M3 halogen-free RoHS only | Lacks automotive qualification; acceptable for industrial/commercial power supplies without AEC mandate | Choose when AEC-Q101 is not required and tape-and-reel delivery (57T) aligns with SMT line setup |
Compared with SMCJ85AHM3_A/I, SMAJ85AHE3_A/H offers footprint reduction at the cost of 73 % lower surge capacity, while SMCJ85A-M3/57T provides identical protection performance without automotive qualification - enabling cost-optimized sourcing where AEC compliance is unnecessary.
Availability
SMCJ85AHM3_A/I is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor interface modules, and telecom power distribution systems requiring stable component supply across extended production lifecycles.
Supply support for SMCJ85AHM3_A/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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and application-specific performance.
The SMCJ series is part of Vishay's TRANSZORB® TVS platform, engineered for high-power transient suppression in harsh environments including automotive, industrial, and telecom infrastructure.
FAQ
What is the clamping voltage of the SMCJ85AHM3_A/I under maximum rated surge current?
The SMCJ85AHM3_A/I clamps to a maximum of 137 V when subjected to its rated peak pulse current of 10.9 A under the standard 10/1000 µs waveform. This value is measured at the device terminals with specified PCB mounting conditions (0.31" × 0.31" copper pads per terminal), and represents the upper limit of voltage seen by downstream circuitry during transient events. The SMCJ85AHM3_A/I maintains this clamping performance across its qualified operating temperature range.
Is the SMCJ85AHM3_A/I qualified for automotive applications?
Yes, the SMCJ85AHM3_A/I is AEC-Q101 qualified, as confirmed by Vishay's ordering code structure: the "HM3" suffix denotes halogen-free, RoHS-compliant construction, and the "_A/I" packaging variant is designated for automotive-grade delivery. This qualification covers stress tests including high-temperature reverse bias, temperature cycling, and ESD robustness - making the SMCJ85AHM3_A/I suitable for engine control, body electronics, and ADAS power domains.
What does the "HM3" suffix mean in SMCJ85AHM3_A/I?
The "HM3" suffix in SMCJ85AHM3_A/I indicates halogen-free, RoHS-compliant construction per Vishay's material categorization system. It distinguishes this variant from commercial-grade "M3" parts by adding AEC-Q101 qualification, and from non-halogen-free "HE3" variants by eliminating brominated flame retardants. The SMCJ85AHM3_A/I therefore meets both environmental compliance (RoHS, halogen-free) and automotive reliability standards simultaneously.
Can the SMCJ85AHM3_A/I be used in bidirectional configurations?
No, the SMCJ85AHM3_A/I is a unidirectional TVS diode, as indicated by the absence of "CA" in its part number. Bidirectional variants (e.g., SMCJ85CA) are explicitly designated with the "CA" suffix and exhibit symmetric clamping in both polarities. Using the unidirectional SMCJ85AHM3_A/I in bidirectional circuits risks failure during reverse-polarity transients; always verify polarity alignment in the schematic and select CA-suffixed parts for AC-coupled or floating-line protection.
What is the thermal resistance and how does it affect layout for SMCJ85AHM3_A/I?
The SMCJ85AHM3_A/I has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on the minimum recommended 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal. This value directly impacts power derating: at 70 °C ambient, its usable power drops to ~3.3 W. To maintain reliability under repeated surges, ensure adequate copper area and avoid thermal bottlenecks - the SMCJ85AHM3_A/I must not exceed +150 °C junction temperature during operation.
SMCJ85AHM3_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:
- 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/I FAQ
1.How can I place an order for SMCJ85AHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ85AHM3_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 SMCJ85AHM3_A/I reliable?
The price and inventory of SMCJ85AHM3_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 SMCJ85AHM3_A/I is usually 5 days.
3.What payment methods are accepted for SMCJ85AHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ85AHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ85AHM3_A/I?
SMCJ85AHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ85AHM3_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 SMCJ85AHM3_A/I?
For technical support, including SMCJ85AHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ85AHM3_A/I requirements.
6.How does Aetrix verify that SMCJ85AHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMCJ85AHM3_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 SMCJ85AHM3_A/I meets industry standards.
7.What is the process for return or replacement of SMCJ85AHM3_A/I?
All SMCJ85AHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ85AHM3_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 SMCJ85AHM3_A/I part is unused and in its original packaging.
Return procedure for SMCJ85AHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ85AHM3_A/I Tags
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