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Vishay General Semiconductor - Diodes Division SMCJ85CAHM3/H
- Part No.:
- SMCJ85CAHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ85CAHM3/H.pdf
- Description:
- TVS DIODE 85VWM 137VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:4,201
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Product details
Overview
SMCJ85CAHM3/H from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, designed for robust overvoltage protection of sensitive electronics. 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) with 10/1000 μs waveform - deployed in automotive sensor signal lines, industrial I/O interfaces, and telecom power rails.
For engineers reviewing the SMCJ85CAHM3/H datasheet, SMCJ85CAHM3/H pinout, SMCJ85CAHM3/H application, or SMCJ85CAHM3/H equivalent, key selection criteria include bidirectional clamping symmetry, AEC-Q101 qualification for automotive use, halogen-free RoHS compliance (HM3 suffix), and thermal resistance (RθJA = 75 °C/W) under standard PCB pad layout.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector, responding within picoseconds to transients induced by inductive switching or ESD events. Its glass-passivated junction ensures stable breakdown behavior, while bidirectional symmetry enables protection on AC-coupled or floating signal paths without polarity concerns.
The device is rated for -55 °C to +150 °C operating junction temperature, meets MSL Level 1 per J-STD-020 (peak reflow 260 °C), and delivers consistent clamping performance across its full temperature range - critical for under-hood automotive modules and industrial PLC backplanes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 85 V - reverse stand-off voltage; defines maximum continuous working voltage before significant leakage begins |
| VBR min/max | 94.4 V / 104 V - breakdown voltage range at 1 mA test current; guarantees reliable turn-on margin above VWM |
| VC @ IPPM | 137 V - clamping voltage at 10.9 A peak pulse current; limits downstream voltage stress during surge events |
| PPPM | 1500 W - peak pulse power handling with 10/1000 μs waveform; supports high-energy transients per ISO 7637-2 Pulse 5a |
| ID @ VWM | 1.0 μA - maximum reverse leakage at 85 V; ensures minimal standby power loss in battery-powered systems |
| TJ max. | +150 °C - maximum junction temperature; enables operation in high-ambient environments like engine control units |
| RθJA | 75 °C/W - thermal resistance junction-to-ambient on standard 8 mm × 8 mm copper pads; informs heatsinking requirements |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-020 and JESD 22-B102. Bidirectional construction means no polarity marking; both terminals are electrically symmetric.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (during positive half-cycle) | One terminal of symmetrical PN junction; conducts when voltage exceeds +VBR relative to cathode |
| Cathode | Transient current entry (during negative half-cycle) | Second terminal of symmetrical PN junction; conducts when voltage exceeds -VBR relative to anode |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection on AC, differential, or floating lines without external polarity management |
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per stress test plan |
| Halogen-free & RoHS-compliant (HM3) | Meets environmental compliance mandates for Tier 1 automotive supply chains and EU industrial equipment |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (e.g., ISO 16750-2 load dump spikes) |
| MSL Level 1 rating | Allows standard SMT reflow without moisture sensitivity concerns - no baking required prior to assembly |
Applications
| Automotive Sensor Protection | Industrial I/O Interface |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor outputs (e.g., pressure, temperature) from load dump and jump-start surges in vehicle ECUs. IC Role / Device Role / Timing Role: Shunt-type transient suppressor placed directly at connector or IC input pins to clamp voltage before it reaches protected silicon. Use Value: Maintains signal integrity under ISO 7637-2 Pulse 5a (12 V system: 420 V/100 ms) with <137 V clamping, preventing latch-up or gate oxide damage. | Use Scenario: Safeguarding programmable logic controller (PLC) digital input modules connected to 24 V DC field wiring exposed to relay coil flyback and lightning-induced surges. IC Role / Device Role / Timing Role: Primary overvoltage clamp on channel-level inputs, coordinated with upstream fusing and filtering. Use Value: Absorbs 1500 W surge energy without degradation, enabling >100,000 surge cycles per IEC 61000-4-5 Level 4 compliance. |
| Telecom Power Rail Protection | Consumer Audio Signal Line |
Use Scenario: Securing 48 V PoE-powered Ethernet switch ports against induced surges from nearby AC mains or antenna coupling. IC Role / Device Role / Timing Role: Secondary-stage TVS on DC input rail, downstream of primary GDT or MOV-based protection. Use Value: Fast response (<1 ns) and low clamping (137 V) prevent overvoltage propagation to DC-DC converters and PHY ICs. | Use Scenario: Shielding line-level audio inputs (RCA/XLR) in AV receivers from ESD events during cable insertion and nearby RF interference. IC Role / Device Role / Timing Role: Low-capacitance bidirectional clamp on balanced/unbalanced analog paths to preserve signal fidelity. Use Value: 1.0 μA leakage at 85 V ensures no audible noise or DC offset; symmetrical clamping avoids signal distortion on AC-coupled paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ85CAHE3/A | Unqualified for AEC-Q101; same VWM/VC/PPPM but lower surge rating (400 W); SMA package (smaller footprint, higher RθJA) | Restricted to commercial-grade consumer or office equipment; not suitable for automotive under-hood deployment | Select only if cost sensitivity outweighs automotive qualification and thermal performance requirements |
| SMCJ85CA-E3/57T | Same electrical specs and AEC-Q101 qualification; differs only in packaging - tape-and-reel (57T) vs. HM3's halogen-free formulation | No functional difference; identical performance in all circuit roles and environmental conditions | Choose HM3 version when halogen-free compliance is mandated by OEM or regional regulation (e.g., China RoHS II) |
Compared with SMAJ85CAHE3/A and SMCJ85CA-E3/57T, the SMCJ85CAHM3/H uniquely combines AEC-Q101 qualification, halogen-free construction, and 1500 W surge capability in the thermally optimized SMC package - making it the preferred choice for safety-critical automotive and industrial designs where long-term reliability and regulatory alignment are non-negotiable.
Availability
SMCJ85CAHM3/H is available at Aetrix Electronics and suitable for automotive ECU design, industrial PLC manufacturing, and telecom infrastructure projects requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for SMCJ85CAHM3/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, efficiency, and application-specific optimization.
The SMCJ series is engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom systems where failure due to voltage surges must be eliminated through robust, standardized, and qualification-backed components.
FAQ
What does the "HM3" suffix indicate in SMCJ85CAHM3/H?
The "HM3" suffix in SMCJ85CAHM3/H denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. It confirms compliance with automotive reliability standards and environmental regulations, distinguishing it from commercial-grade variants like E3 or M3. The "H" package code specifies 7-inch tape-and-reel delivery. SMCJ85CAHM3/H is fully validated for under-hood automotive use and meets JESD201 Class 2 whisker resistance requirements.
Is SMCJ85CAHM3/H bidirectional, and how does that affect circuit placement?
Yes, SMCJ85CAHM3/H is a bidirectional TVS diode, meaning it clamps voltage transients equally in both polarities - ideal for AC-coupled, differential, or floating signal paths where polarity is undefined. Unlike unidirectional types, it has no cathode band marking and requires no orientation during placement. This simplifies layout on CAN buses, Ethernet PHY interfaces, or sensor bridges where SMCJ85CAHM3/H can be mounted without polarity verification.
What is the maximum clamping voltage of SMCJ85CAHM3/H, and under what test condition is it specified?
The maximum clamping voltage (VC) of SMCJ85CAHM3/H is 137 V, measured at a peak pulse current (IPPM) of 10.9 A using the standardized 10/1000 μs double-exponential waveform. This value represents the worst-case voltage seen by downstream circuitry during a surge event and is guaranteed across the full operating temperature range (-55 °C to +150 °C). SMCJ85CAHM3/H maintains this clamping performance without degradation over its rated lifetime.
Can SMCJ85CAHM3/H replace SMCJ85CA-E3/57T in an existing design?
Yes, SMCJ85CAHM3/H is a direct form-fit-function replacement for SMCJ85CA-E3/57T in most applications, sharing identical electrical specifications, SMC package dimensions, and AEC-Q101 qualification. The only differences are halogen-free material content (HM3) and packaging format ("H" vs. "57T"). No PCB changes are required, and SMCJ85CAHM3/H offers enhanced environmental compliance for new designs targeting stricter regulatory frameworks.
What thermal derating applies to SMCJ85CAHM3/H at elevated ambient temperatures?
SMCJ85CAHM3/H follows the derating curve in Figure 2 of Vishay document 88394: its peak pulse power (PPPM) decreases linearly above TA = 25 °C, reaching ~50 % of 1500 W at TA ≈ 100 °C when mounted on the recommended 8.0 mm × 8.0 mm copper pads. Junction temperature must remain ≤150 °C; designers should verify layout thermal performance using RθJA = 75 °C/W and expected power dissipation. SMCJ85CAHM3/H remains fully functional up to TJ = 150 °C.
SMCJ85CAHM3/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:
- -
- Bidirectional Channels:
- 1
- 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)
SMCJ85CAHM3/H FAQ
1.How can I place an order for SMCJ85CAHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ85CAHM3/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 SMCJ85CAHM3/H reliable?
The price and inventory of SMCJ85CAHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ85CAHM3/H is usually 5 days.
3.What payment methods are accepted for SMCJ85CAHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ85CAHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ85CAHM3/H?
SMCJ85CAHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ85CAHM3/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 SMCJ85CAHM3/H?
For technical support, including SMCJ85CAHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ85CAHM3/H requirements.
6.How does Aetrix verify that SMCJ85CAHM3/H is sourced from the original manufacturer or authorized distributors?
All SMCJ85CAHM3/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 SMCJ85CAHM3/H meets industry standards.
7.What is the process for return or replacement of SMCJ85CAHM3/H?
All SMCJ85CAHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ85CAHM3/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 SMCJ85CAHM3/H part is unused and in its original packaging.
Return procedure for SMCJ85CAHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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