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Vishay General Semiconductor - Diodes Division SMCJ85AHE3/57T
- Part No.:
- SMCJ85AHE3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ85AHE3/57T.pdf
- Description:
- TVS DIODE 85VWM 137VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:4,190
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Product details
Overview
SMCJ85AHE3/57T from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMC (DO-214AB) package, designed for clamping voltage transients up to 137 V at 10.9 A (10/1000 μs waveform), with 85 V stand-off voltage and 1500 W peak pulse power rating. It protects MOSFETs, ICs, and sensor signal lines in automotive and industrial power electronics.
For engineers reviewing the SMCJ85AHE3/57T datasheet, SMCJ85AHE3/57T pinout, SMCJ85AHE3/57T application, or SMCJ85AHE3/57T equivalent, key selection criteria include its AEC-Q101 qualification, 94.4–104 V breakdown voltage range at 1 mA, low 0.106 %/°C VBR temperature coefficient, and compatibility with automated SMT assembly on 8.0 mm × 8.0 mm copper pads.
Technical Context
This TVS diode operates as a clamping device in parallel with sensitive circuit nodes, conducting only when reverse voltage exceeds its breakdown threshold (VBR = 94.4–104 V). Its glass-passivated junction ensures stable leakage (<1.0 μA at 85 V) and fast response time (<1.0 ps typical), enabling protection against ESD, lightning-induced surges, and inductive switching spikes.
Thermal design relies on its RθJA of 75 °C/W and RθJL of 15 °C/W, with maximum junction temperature rated at +150 °C. The device is rated for non-repetitive 200 A surge current (8.3 ms half-sine) and meets MSL Level 1 per J-STD-020 at 260 °C peak reflow.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VWM) | 85 V - Maximum continuous reverse operating voltage before significant conduction begins. |
| Breakdown Voltage (VBR) | 94.4–104 V at 1 mA - Confirmed clamping initiation range; defines minimum overvoltage threshold for protection activation. |
| Clamping Voltage (VC) | 137 V at 10.9 A (10/1000 μs) - Actual voltage seen by protected circuit during worst-case transient event. |
| Peak Pulse Power (PPPM) | 1500 W - Maximum transient energy absorption capability under standardized surge waveform. |
| Reverse Leakage (ID) | ≤1.0 μA at 85 V - Ensures negligible standby current draw and no interference with high-impedance signal paths. |
| Operating Temperature | −55 °C to +150 °C - Validated performance across automotive under-hood and industrial ambient conditions. |
| Temperature Coefficient | +0.106 %/°C - Predictable VBR drift enables accurate margining in thermal-critical designs. |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, matte tin-plated leads, RoHS-compliant and AEC-Q101 qualified. Cathode indicated by band marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink node | Connected to protected line; conducts surge current to ground when VREV > VBR. |
| Anode | Reference/ground return path | Typically tied to system ground plane; completes clamping loop with minimal inductance. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated reliability for automotive powertrain and body electronics applications per stress test requirements. |
| Glass passivated junction | Stable electrical parameters over lifetime; prevents moisture ingress and degradation under thermal cycling. |
| Low incremental surge resistance | Enables tighter clamping (VC − VWM = 52 V margin) and reduced let-through energy during transients. |
| MSL Level 1 rating | Supports standard SMT reflow without baking; compatible with 260 °C peak profile per J-STD-020. |
| UL 94 V-0 molding compound | Self-extinguishing encapsulation meets fire safety requirements for enclosed industrial and automotive modules. |
Applications
| Automotive Power Distribution | Industrial Motor Drive Inputs |
|---|---|
Use Scenario: Protection of 12 V/24 V battery-fed ECUs against load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS placed across input rails to clamp transients before DC-DC converters. Use Value: Withstands 1500 W surges while limiting rail voltage to ≤137 V, preventing damage to downstream regulators and microcontrollers. |
Use Scenario: Input stage protection for 3-phase IGBT gate drivers exposed to inductive kickback. IC Role / Device Role / Timing Role: Parallel-connected TVS absorbing turn-off spikes on DC bus lines. Use Value: Fast <1 ps response and 137 V clamping ensure gate driver ICs remain within safe operating area during rapid switching events. |
| Telecom PoE Interface | Automotive Sensor Signal Lines |
Use Scenario: Surge suppression on IEEE 802.3af/at Power over Ethernet data pairs. IC Role / Device Role / Timing Role: Bidirectional-capable variant family member used in unidirectional configuration for DC bias rail protection. Use Value: 85 V VWM aligns with PoE+ 57 V max supply, allowing headroom for normal operation while blocking transients above 94.4 V. |
Use Scenario: CAN/LIN bus or analog sensor inputs in ADAS modules subjected to ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Localized TVS at connector entry point to shunt ESD and coupled noise. Use Value: 1.0 μA leakage at 85 V avoids loading high-impedance sensor outputs; AEC-Q101 qualification ensures field reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC85AHE3/57T | Same VWM (85 V) and PPPM (1500 W), but lower VC = 128 V at 11.7 A; SAC series uses different chip construction. | Better clamping ratio (VC/VWM = 1.51 vs. 1.61), suited for tighter voltage margins. | Select SAC85AHE3/57T when lower let-through voltage is critical and higher IPPM tolerance is acceptable. |
| SMCJ85CAHE3/57T | Bidirectional version; identical VWM (85 V), VBR (±94.4–104 V), and VC (137 V), but symmetric conduction in both polarities. | Required for AC-coupled or floating signal lines where polarity reversal may occur. | Choose SMCJ85CAHE3/57T only when bidirectional protection is mandated by circuit topology or standards (e.g., RS-485). |
Compared with SMCJ85AHE3/57T, SAC85AHE3/57T offers improved clamping efficiency at the cost of slightly reduced surge current handling, while SMCJ85CAHE3/57T provides polarity-agnostic protection essential for differential or AC-biased interfaces - neither is pin-compatible without layout review due to differing polarity marking and functional directionality.
Availability
SMCJ85AHE3/57T is available at Aetrix Electronics and suitable for automotive power distribution, industrial motor drive inputs, telecom PoE interface, and automotive sensor signal line applications requiring stable component supply and long-term lifecycle support.
Supply support for SMCJ85AHE3/57T 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, and protection devices with emphasis on reliability, automotive qualification, and high-power handling.
The SMCJ series was developed specifically for robust transient suppression in harsh environments-targeting automotive, industrial, and telecom systems where 1500 W surge immunity and AEC-Q101 compliance are mandatory.
FAQ
What is the breakdown voltage range for SMCJ85AHE3/57T?
The SMCJ85AHE3/57T has a guaranteed breakdown voltage (VBR) range of 94.4 V to 104 V at 1 mA test current, measured per ANSI/IEEE C62.35. This range ensures consistent clamping behavior across production lots and temperature extremes, supporting reliable overvoltage protection design margining.
Is SMCJ85AHE3/57T suitable for automotive applications?
Yes, SMCJ85AHE3/57T is AEC-Q101 qualified and explicitly designated for automotive use via the "HE3" suffix. It meets stress test requirements for temperature cycling, humidity, mechanical shock, and surge endurance-making it appropriate for engine control units, body electronics, and ADAS power supplies.
What does the "57T" suffix indicate in SMCJ85AHE3/57T?
The "57T" suffix denotes the preferred packaging format: 7-inch diameter plastic tape and reel, with a base quantity of 850 units per reel. This configuration supports automated pick-and-place assembly and is optimized for high-volume SMT production lines.
How does SMCJ85AHE3/57T compare to SMCJ85CAHE3/57T?
SMCJ85AHE3/57T is unidirectional with cathode band marking, while SMCJ85CAHE3/57T is bidirectional with no polarity marking. Both share identical VWM (85 V), VBR (±94.4–104 V), and VC (137 V), but differ in conduction directionality-requiring separate PCB layouts and functional validation.
What thermal derating applies to SMCJ85AHE3/57T above 25 °C ambient?
SMCJ85AHE3/57T must be derated linearly above TA = 25 °C per Figure 2 in Vishay document 88394: peak pulse power drops to ~75 % at 75 °C ambient and ~50 % at 125 °C. Derating ensures junction temperature remains ≤150 °C under repeated surge conditions.
SMCJ85AHE3/57T 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):
- 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMCJ)
SMCJ85AHE3/57T FAQ
1.How can I place an order for SMCJ85AHE3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ85AHE3/57T 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 SMCJ85AHE3/57T reliable?
The price and inventory of SMCJ85AHE3/57T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ85AHE3/57T is usually 5 days.
3.What payment methods are accepted for SMCJ85AHE3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ85AHE3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ85AHE3/57T?
SMCJ85AHE3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ85AHE3/57T 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 SMCJ85AHE3/57T?
For technical support, including SMCJ85AHE3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ85AHE3/57T requirements.
6.How does Aetrix verify that SMCJ85AHE3/57T is sourced from the original manufacturer or authorized distributors?
All SMCJ85AHE3/57T 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 SMCJ85AHE3/57T meets industry standards.
7.What is the process for return or replacement of SMCJ85AHE3/57T?
All SMCJ85AHE3/57T units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ85AHE3/57T, 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 SMCJ85AHE3/57T part is unused and in its original packaging.
Return procedure for SMCJ85AHE3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ85AHE3/57T Tags
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