My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SMCJ85AHE3_A/I
- Part No.:
- SMCJ85AHE3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ85AHE3_A/I.pdf
- Description:
- TVS DIODE 85VWM 137VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,077
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMCJ85AHE3_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 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, 1500 W peak pulse power (10/1000 µs), clamping voltage of 137 V at 10.9 A, and AEC-Q101 qualification for automotive use.
For engineers reviewing the SMCJ85AHE3_A/I datasheet, SMCJ85AHE3_A/I pinout, SMCJ85AHE3_A/I application, or SMCJ85AHE3_A/I equivalent, key selection criteria include clamping performance under 10/1000 µs surges, junction temperature derating above 25 °C, unidirectional polarity marking, and compliance with UL 497B and AEC-Q101 for automotive electronics protection.
Technical Context
This TVS diode operates as a voltage-clamping device that enters avalanche conduction when reverse voltage exceeds its breakdown threshold, diverting transient energy to ground while limiting downstream voltage to ≤137 V. Its glass-passivated junction ensures stable VBR and low leakage (<1.0 µA at 85 V).
Thermal design relies on RθJA = 75 °C/W (on recommended 8.0 mm × 8.0 mm copper pads) and RθJL = 15 °C/W, enabling sustained operation up to TJ = 150 °C. The device meets MSL Level 1 per J-STD-020 and supports lead-free reflow up to 260 °C peak.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 85 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC rail margin. |
| VBR min/max | 94.4 V / 104 V at 1 mA - Confirmed breakdown range ensures reliable turn-on without premature conduction. |
| VC @ IPPM | 137 V at 10.9 A - Clamping voltage under 10/1000 µs surge; determines maximum stress on protected ICs. |
| PPPM | 1500 W - Peak pulse power handling capacity; validates robustness against IEC 61000-4-5 Level 4 surges. |
| ID @ VWM | ≤1.0 µA - Reverse leakage current at rated stand-off; critical for low-power sensor line integrity. |
| TJ max | +150 °C - Maximum junction temperature; enables deployment in under-hood automotive environments. |
| Package | SMC (DO-214AB) - Surface-mount outline with 7.75 mm × 6.22 mm footprint; compatible with automated placement. |
Pinout & Package
SMCJ85AHE3_A/I uses the standard SMC (DO-214AB) package: two-terminal unidirectional configuration with cathode indicated by a band on the body. Leads are matte tin-plated, solderable per J-STD-002 and JESD 22-B102, and meet JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection to protected circuit ground | Current return path during clamping; must connect to low-impedance chassis or system ground plane. |
| Cathode | High-side connection to protected line (e.g., 85 V rail) | Marked end of device; connects to line being protected-reverse-biased during normal operation. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per AEC standard. |
| Glass passivated junction | Ensures stable VBR over time and temperature, minimizing parameter drift in harsh environments. |
| Low incremental surge resistance | Enables tighter clamping (137 V) under high-current transients, reducing voltage overshoot on sensitive loads. |
| MSL Level 1 rating | Allows unlimited floor life and reflow at 260 °C peak without preconditioning-simplifies SMT manufacturing. |
| UL 497B recognized | Qualified for telecom and industrial surge protection systems requiring third-party safety certification. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 12 V/24 V battery-fed ECUs from load dump and alternator transients. IC Role / Device Role / Timing Role: Unidirectional clamping device placed between power input and upstream filter capacitor. Use Value: Limits voltage to ≤137 V during ISO 7637-2 Pulse 5a (load dump), preventing damage to MCU power supplies and CAN transceivers. |
Use Scenario: Shielding analog sensor outputs (e.g., pressure, temperature) from ESD and cable discharge events. IC Role / Device Role / Timing Role: Low-leakage (≤1.0 µA) TVS connected across differential signal pair or single-ended output. Use Value: Maintains signal integrity with <1 µA leakage at 85 V, while clamping 8 kV HBM ESD pulses to safe levels for precision ADC front-ends. |
| Telecom DC Feeder Protection | Consumer Power Adapter Input Stage |
|
Use Scenario: Safeguarding PoE-powered equipment inputs against lightning-induced surges on 48 V DC lines. IC Role / Device Role / Timing Role: Primary surge clamp on DC input before DC/DC converter stage. Use Value: Handles 1500 W 10/1000 µs surges per IEC 61000-4-5, meeting EN 61000-4-5 Level 4 requirements for outdoor telecom gear. |
Use Scenario: Secondary-side overvoltage suppression in AC/DC adapters supplying 85 V-rated subsystems. IC Role / Device Role / Timing Role: Standoff-rated TVS placed after rectification but before bulk capacitor and regulator. Use Value: Prevents catastrophic failure during MOV degradation or rectifier short-circuit events, with verified 1500 W surge capability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC85AHE3_A/I | Same VWM (85 V), lower PPPM (500 W), smaller SMA package (DO-214AC) | Limited to lower-energy transients; unsuitable for ISO 7637-2 Pulse 5a or IEC 61000-4-5 Level 4 | Select only where board space is constrained and surge threat level is ≤500 W. |
| SMCJ85CAHE3_A/I | Bidirectional variant; identical VWM/VBR/PPPM but symmetrical clamping in both polarities | Required for AC-coupled or floating signal lines where polarity reversal may occur | Choose when protecting bidirectional interfaces (e.g., RS-485, CAN FD bus) or AC power inputs. |
Compared with SMCJ85AHE3_A/I, SAC85AHE3_A/I trades surge robustness for compactness, while SMCJ85CAHE3_A/I adds bidirectional symmetry at no cost to power rating-making it essential for AC or polarity-agnostic protection schemes.
Availability
SMCJ85AHE3_A/I is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor modules, telecom DC feeders, and consumer power adapter designs requiring stable component supply and AEC-Q101-compliant surge protection.
Supply support for SMCJ85AHE3_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 automotive qualification.
The SMCJ series is engineered for high-energy transient suppression in demanding environments, targeting automotive, industrial, and telecom applications where robustness against ISO 7637-2 and IEC 61000-4-5 surges is mandatory.
FAQ
What is the clamping voltage of SMCJ85AHE3_A/I at its rated peak pulse current?
The SMCJ85AHE3_A/I clamps to 137 V at its specified peak pulse current of 10.9 A under a 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and defines the maximum voltage seen by downstream circuitry during a full-rated surge event. The clamping performance is validated across the operating temperature range and forms the basis for safe margining of protected ICs' absolute maximum ratings.
Is SMCJ85AHE3_A/I suitable for automotive applications?
Yes, SMCJ85AHE3_A/I is AEC-Q101 qualified and explicitly designated for automotive use with the "HE3" suffix. It undergoes stress testing including temperature cycling, high-temperature reverse bias (HTRB), and ESD per AEC-Q101 Rev D. Its 150 °C maximum junction temperature and robust clamping make it appropriate for engine control units, body control modules, and ADAS power supplies exposed to load dump and jump-start conditions.
How does the SMCJ85AHE3_A/I differ from the bidirectional SMCJ85CAHE3_A/I?
The SMCJ85AHE3_A/I is unidirectional with cathode marking and conducts only in reverse breakdown, while SMCJ85CAHE3_A/I is bidirectional with no polarity marking and clamps symmetrically in both directions. Their VWM, VBR, PPPM, and package are identical-but SMCJ85CAHE3_A/I is required for AC signals, floating buses, or applications where voltage polarity reversal occurs, such as RS-485 or CAN FD transceivers.
What is the thermal resistance of SMCJ85AHE3_A/I, and how does it affect layout?
SMCJ85AHE3_A/I has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on 8.0 mm × 8.0 mm copper pads per terminal, and RθJL = 15 °C/W to the lead. To maintain TJ ≤ 150 °C under continuous 6.5 W dissipation, PCB layout must provide adequate copper area and minimize trace length to ground. Derating curves in Figure 2 show power reduction above 25 °C ambient.
Does SMCJ85AHE3_A/I meet UL safety standards?
Yes, SMCJ85AHE3_A/I carries Underwriters Laboratories recognition under UL 497B (QVGQ2) for protector classification, with file number E136766. This certification confirms suitability for use in telecommunications and industrial equipment requiring third-party safety validation of transient protection devices, including flammability compliance (UL 94 V-0 molding compound).
SMCJ85AHE3_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:
- -
- 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_A/I FAQ
1.How can I place an order for SMCJ85AHE3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ85AHE3_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 SMCJ85AHE3_A/I reliable?
The price and inventory of SMCJ85AHE3_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 SMCJ85AHE3_A/I is usually 5 days.
3.What payment methods are accepted for SMCJ85AHE3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ85AHE3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ85AHE3_A/I?
SMCJ85AHE3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ85AHE3_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 SMCJ85AHE3_A/I?
For technical support, including SMCJ85AHE3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ85AHE3_A/I requirements.
6.How does Aetrix verify that SMCJ85AHE3_A/I is sourced from the original manufacturer or authorized distributors?
All SMCJ85AHE3_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 SMCJ85AHE3_A/I meets industry standards.
7.What is the process for return or replacement of SMCJ85AHE3_A/I?
All SMCJ85AHE3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ85AHE3_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 SMCJ85AHE3_A/I part is unused and in its original packaging.
Return procedure for SMCJ85AHE3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ85AHE3_A/I Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
Tech Hub
Comparator circuit design covering voltage thresholds, input limits, open-collector outputs, LM393 wiring, op-amp differences, hysteresis, timing, window detection and practical fault diagnosis.
Schmitt triggers use separate rising and falling thresholds to stabilize slow or noisy signals. This guide covers hysteresis, 74HC14 and 74HCT14 selection, comparator calculations, RC oscillators and p…
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
