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Vishay General Semiconductor - Diodes Division SMCJ8.5AHE3_A/I
- Part No.:
- SMCJ8.5AHE3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ8.5AHE3_A/I.pdf
- Description:
- TVS DIODE 8.5VWM 14.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMCJ8.5AHE3_A/I from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, designed for robust overvoltage protection of sensitive electronics. It features a 8.5 V stand-off voltage (VWM), 9.44–10.4 V breakdown voltage (VBR) at 1 mA, 14.4 V clamping voltage (VC) at 104.2 A peak pulse current (IPPM), and 1500 W peak pulse power (PPPM) with 10/1000 μs waveform.
For engineers reviewing the SMCJ8.5AHE3_A/I datasheet, SMCJ8.5AHE3_A/I pinout, SMCJ8.5AHE3_A/I application, or SMCJ8.5AHE3_A/I equivalent, key selection criteria include clamping performance under automotive-grade surge conditions, AEC-Q101 qualification status, thermal resistance (RθJA = 75 °C/W), and compatibility with automated SMT placement on 8.0 mm × 8.0 mm copper pads.
Technical Context
The SMCJ8.5AHE3_A/I operates as a unidirectional avalanche diode with glass-passivated junction, delivering fast response to transients induced by inductive load switching or ESD events. Its low incremental surge resistance and 1500 W PPPM rating enable effective suppression of high-energy surges while maintaining stable clamping below 14.4 V at rated IPPM.
Designed for surface-mount use in automotive and industrial environments, it meets MSL level 1 per J-STD-020, supports peak reflow temperatures up to 260 °C, and is qualified to AEC-Q101 - confirmed by HE3 suffix and ordering code structure. Polarity is marked by cathode band; no marking on bidirectional variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.5 V - maximum reverse working voltage before clamping begins; sets operating margin for protected circuitry |
| VBR min/max | 9.44 V / 10.4 V at IT = 1 mA - defines guaranteed breakdown threshold for reliable turn-on during transients |
| VC @ IPPM | 14.4 V at 104.2 A - clamping voltage under full 1500 W surge; determines worst-case stress on downstream ICs |
| PPPM | 1500 W - peak pulse power handling with 10/1000 μs waveform; validates suitability for ISO 7637-2 Pulse 1/2/5a/b |
| TJ max | +150 °C - maximum junction temperature; enables operation in under-hood automotive environments |
| RθJA | 75 °C/W - thermal resistance junction-to-ambient on standard pad layout; informs heatsinking requirements |
| Package | SMC (DO-214AB) - industry-standard surface-mount outline with 0.305" × 0.220" footprint and matte tin leads |
Pinout & Package
SMCJ8.5AHE3_A/I uses the SMC (DO-214AB) package: a 2-terminal surface-mount device with cathode indicated by a band on the body. Terminals are matte tin-plated, solderable per J-STD-002 and JESD 22-B102, and meet JESD 201 Class 2 whisker test requirements.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point in forward bias; connected to protected line ground or low-side reference | Provides return path during clamping; must be routed with low-inductance trace to minimize voltage overshoot |
| Cathode | Current exit point in forward bias; marked by band; connected to protected signal/power rail | Defines polarity-sensitive connection - reversal disables protection; critical for correct integration into unidirectional circuits |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and ADAS sensors requiring long-term reliability under thermal cycling and vibration |
| Glass passivated junction | Enhances long-term stability and moisture resistance versus epoxy-passivated alternatives; improves surge life under repeated transients |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (e.g., ISO 10605 ESD), improving protection margin for sub-15 V logic rails |
| MSL Level 1 compliance | Enables direct placement without baking; supports standard reflow profiles up to 260 °C peak, reducing manufacturing complexity |
| 1500 W peak pulse rating | Handles high-energy surges such as ISO 7637-2 Pulse 5a (load dump) without degradation when mounted on 8 mm × 8 mm copper pads |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V supply lines in engine control modules against load dump transients per ISO 7637-2 Pulse 5a. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and DC-DC input to clamp surges above 14.4 V. Use Value: Limits voltage seen by downstream regulators to ≤14.4 V during 100 V/100 ms transients, preventing latch-up or damage. | Use Scenario: Shielding analog sensor outputs (e.g., pressure, temperature) in factory automation PLC I/O modules from EFT and surge coupling. IC Role / Device Role / Timing Role: TVS placed across differential signal pair or single-ended output to shunt fast transients before reaching ADC front-end. Use Value: Clamps 4 kV EFT bursts to <15 V within nanoseconds, preserving signal integrity and measurement accuracy. |
| Consumer USB Power Delivery Protection | Telecom Base Station DC Feeder Protection |
Use Scenario: Safeguarding USB-C PD controller ICs and port power switches from hot-swap and cable-induced transients. IC Role / Device Role / Timing Role: Unidirectional TVS on VBUS line upstream of buck converter, referenced to system ground. Use Value: Absorbs 1500 W pulses without failure, enabling compliance with IEC 61000-4-5 Level 3 (1 kV/2 Ω) on 5–20 V rails. | Use Scenario: Protecting -48 V DC feeder inputs in 5G remote radio units from lightning-induced surges entering via outdoor cabling. IC Role / Device Role / Timing Role: TVS installed at DC input connector, clamping negative-going transients toward ground. Use Value: Withstands repeated 10/1000 μs surges up to 1500 W while maintaining VWM = 8.5 V margin below nominal -48 V rail absolute value. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC8.5AHE3_A/I | Same VWM (8.5 V), lower PPPM (600 W), smaller SMA package (DO-214AC) | Limited to lower-energy transients (IEC 61000-4-2/4-4); unsuitable for ISO 7637-2 Pulse 5a | Select only where space constraints outweigh surge energy requirements |
| SMCJ8.5CAHE3_A/I | Bidirectional variant; identical VWM, VBR, VC, and PPPM but symmetrical clamping in both polarities | Required for AC-coupled or floating signal lines (e.g., RS-485, CAN bus) where polarity reversal occurs | Choose when protecting bidirectional data lines or ungrounded systems |
Compared with SAC8.5AHE3_A/I and SMCJ8.5CAHE3_A/I, the SMCJ8.5AHE3_A/I provides optimal balance of high-energy surge handling (1500 W), AEC-Q101 qualification, and unidirectional clamping - making it the preferred choice for automotive power rail and industrial DC supply protection where polarity is fixed and surge severity is high.
Availability
SMCJ8.5AHE3_A/I is available at Aetrix Electronics and suitable for automotive ECUs, industrial PLCs, and telecom DC power systems requiring stable component supply, AEC-Q101 validation, and consistent 1500 W surge immunity across production batches.
Supply support for SMCJ8.5AHE3_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, rectifiers, MOSFETs, and protection devices with emphasis on reliability, precision, and automotive-grade qualification.
The SMCJ series is part of Vishay's TRANSZORB® TVS platform, engineered specifically for high-power transient suppression in harsh environments - targeting automotive, industrial, and telecom infrastructure applications demanding AEC-Q101 compliance and repeatable clamping performance.
FAQ
What is the clamping voltage of the SMCJ8.5AHE3_A/I under maximum rated surge current?
The SMCJ8.5AHE3_A/I has a maximum clamping voltage (VC) of 14.4 V when subjected to its rated peak pulse current (IPPM) of 104.2 A using a 10/1000 μs waveform. This value is measured at TA = 25 °C on standard 8.0 mm × 8.0 mm copper pads and defines the upper voltage limit imposed on protected circuitry during worst-case transient events. The SMCJ8.5AHE3_A/I maintains this clamping performance consistently due to its glass-passivated junction and low incremental surge resistance.
Is the SMCJ8.5AHE3_A/I qualified for automotive applications?
Yes, the SMCJ8.5AHE3_A/I is AEC-Q101 qualified, as confirmed by its HE3 suffix and inclusion in Vishay's AEC-Q101-compliant product listing. It is rated for operating junction temperatures from –55 °C to +150 °C and meets MSL Level 1 per J-STD-020, supporting lead-free reflow up to 260 °C. These attributes make the SMCJ8.5AHE3_A/I suitable for under-hood and cabin-mounted automotive electronics including body control modules and ADAS sensor interfaces.
How does the SMCJ8.5AHE3_A/I differ from bidirectional versions like SMCJ8.5CAHE3_A/I?
The SMCJ8.5AHE3_A/I is unidirectional, meaning it conducts only when the cathode is positive relative to the anode - ideal for DC power rail protection. In contrast, SMCJ8.5CAHE3_A/I is bidirectional, providing symmetrical clamping for AC signals or floating lines. Both share identical VWM (8.5 V), VBR (9.44–10.4 V), VC (14.4 V), and PPPM (1500 W), but the SMCJ8.5AHE3_A/I requires correct polarity orientation during PCB layout, whereas the CA variant has no polarity marking.
What is the thermal resistance of the SMCJ8.5AHE3_A/I, and how does it affect layout?
The SMCJ8.5AHE3_A/I has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on the minimum recommended pad layout (0.31" × 0.31" copper pads per terminal). This value assumes no additional heatsinking; designers must ensure adequate copper area and avoid thermal bottlenecks in high-duty-cycle surge environments. For sustained power dissipation, derating per Figure 2 in the datasheet applies above TA = 25 °C. The SMCJ8.5AHE3_A/I's RθJA directly impacts safe operating area during repetitive transients.
Can the SMCJ8.5AHE3_A/I be used in place of older SMCJ8.5A-E3 variants?
Yes, the SMCJ8.5AHE3_A/I is a direct replacement for SMCJ8.5A-E3 in terms of electrical specifications, package, and pinout - differing only in qualification level (AEC-Q101 vs. commercial grade) and packaging format (reel size and coding). Both share identical VWM (8.5 V), VBR (9.44–10.4 V), VC (14.4 V), and PPPM (1500 W). The SMCJ8.5AHE3_A/I adds automotive qualification and enhanced process controls, making it suitable for new designs requiring AEC-Q101 compliance without layout changes.
SMCJ8.5AHE3_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):
- 8.5V
- Voltage - Breakdown (Min):
- 9.44V
- Voltage - Clamping (Max) @ Ipp:
- 14.4V
- Current - Peak Pulse (10/1000µs):
- 104.2A
- 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)
SMCJ8.5AHE3_A/I FAQ
1.How can I place an order for SMCJ8.5AHE3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ8.5AHE3_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 SMCJ8.5AHE3_A/I reliable?
The price and inventory of SMCJ8.5AHE3_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 SMCJ8.5AHE3_A/I is usually 5 days.
3.What payment methods are accepted for SMCJ8.5AHE3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ8.5AHE3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ8.5AHE3_A/I?
SMCJ8.5AHE3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ8.5AHE3_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 SMCJ8.5AHE3_A/I?
For technical support, including SMCJ8.5AHE3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ8.5AHE3_A/I requirements.
6.How does Aetrix verify that SMCJ8.5AHE3_A/I is sourced from the original manufacturer or authorized distributors?
All SMCJ8.5AHE3_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 SMCJ8.5AHE3_A/I meets industry standards.
7.What is the process for return or replacement of SMCJ8.5AHE3_A/I?
All SMCJ8.5AHE3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ8.5AHE3_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 SMCJ8.5AHE3_A/I part is unused and in its original packaging.
Return procedure for SMCJ8.5AHE3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ8.5AHE3_A/I Tags
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