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Vishay General Semiconductor - Diodes Division SMCJ8.5AHE3_A/H
- Part No.:
- SMCJ8.5AHE3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ8.5AHE3_A/H.pdf
- Description:
- TVS DIODE 8.5VWM 14.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMCJ8.5AHE3_A/H from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, designed for robust overvoltage protection of DC power rails and signal lines. 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/H datasheet, SMCJ8.5AHE3_A/H pinout, SMCJ8.5AHE3_A/H application, or SMCJ8.5AHE3_A/H equivalent, key selection criteria include clamping performance under automotive load-dump transients, 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/H operates as a unidirectional avalanche diode, conducting only when reverse voltage exceeds its breakdown threshold. Its glass-passivated junction ensures stable VBR tolerance (±5%) and low incremental surge resistance, enabling precise clamping during fast-rising transients such as ISO 7637-2 Pulse 1/2a/5a.
Designed for surface-mount use on PCBs with minimum 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal, it delivers 1500 W surge capability while maintaining TJ ≤ 150 °C under derated conditions. 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 | 8.5 V - maximum continuous reverse operating voltage before clamping begins; sets upper limit for normal circuit operation |
| VBR min/max | 9.44 V / 10.4 V at IT = 1 mA - defines guaranteed breakdown window for design margining against false triggering |
| VC @ IPPM | 14.4 V at 104.2 A - clamped voltage seen by protected IC during worst-case 10/1000 μs surge; determines downstream voltage stress |
| PPPM | 1500 W - peak transient energy absorption capacity using standard 10/1000 μs waveform; validates compliance with IEC 61000-4-5 Level 4 |
| ID @ VWM | 20 μA - reverse leakage at rated stand-off voltage; low enough to avoid measurable power loss in battery-powered systems |
| TJ max | +150 °C - maximum junction temperature; enables operation in under-hood automotive environments without derating |
| RθJA | 75 °C/W - thermal resistance from junction to ambient; informs heatsinking requirements when operating near PD = 6.5 W |
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 |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., ground or return path); conducts during forward surge events (IFSM = 200 A) |
| Cathode | Reverse-biased clamping terminal | Connected to protected line (e.g., 12 V rail); initiates avalanche conduction when reverse voltage exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and body electronics requiring reliability under thermal cycling and vibration |
| Low incremental surge resistance | Enables tighter VC–VBR spread (ΔV = 4.96 V), reducing voltage overshoot during fast transients compared to higher-Rsurge TVS devices |
| MSL Level 1 rating | Allows unlimited floor life and standard reflow without baking; compatible with high-volume SMT assembly lines |
| Glass passivated junction | Provides stable VBR over time and temperature, minimizing drift in critical clamping thresholds across -55 °C to +150 °C range |
| 1500 W peak pulse power | Supports protection against severe load-dump events (e.g., ISO 16750-2) without degradation after single-event exposure |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 12 V supply inputs in automotive ECUs exposed to ISO 16750-2 load-dump transients up to 35 V for 400 ms. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between battery feed and LDO input to limit voltage excursion to ≤14.4 V. Use Value: Prevents latch-up or permanent damage to downstream regulators and microcontrollers during alternator disconnection events. |
Use Scenario: Safeguarding analog output lines (e.g., 4–20 mA current loop) in industrial pressure sensors connected to long cables subject to EFT bursts. IC Role / Device Role / Timing Role: Reverse-biased TVS shunt mounted at sensor PCB edge to divert fast 5 kV/50 ns EFT pulses per IEC 61000-4-4. Use Value: Maintains signal integrity by clamping induced surges below ADC input absolute maximum ratings without affecting steady-state accuracy. |
| Consumer USB Port ESD Protection | Telecom DC Feeder Line Protection |
|
Use Scenario: Adding secondary overvoltage defense on VBUS line of USB-C ports in portable monitors subjected to hot-plug inductive kickback. IC Role / Device Role / Timing Role: Primary TVS in series with polyfuse; clamps transients faster than internal USB PHY ESD structures. Use Value: Extends system-level ESD immunity beyond ±8 kV contact per IEC 61000-4-2 by absorbing residual energy after integrated protection triggers. |
Use Scenario: Protecting -48 V DC power feeds in telecom base station remote radio units from lightning-induced surges on outdoor cable runs. IC Role / Device Role / Timing Role: Unidirectional TVS installed at power entry point to clamp positive-going surges while allowing normal negative bias operation. Use Value: Limits transient voltage to <15 V above nominal rail, preventing damage to DC-DC converters and FET-based hot-swap controllers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC8.5A-TB-E3 | Same VWM (8.5 V), lower PPPM (600 W), smaller SMA package (DO-214AC), RθJA = 125 °C/W | Limited to lower-energy transients; unsuitable for automotive load-dump; preferred for space-constrained consumer PCBs | Select when board area is critical and surge threat level is limited to IEC 61000-4-5 Level 2. |
| 1.5KE8.5A | Through-hole DO-201 package, identical VWM/VBR/VC specs, same 1500 W rating, but higher RθJA (100 °C/W) | Requires wave soldering; not AEC-Q101 qualified; used in legacy industrial power supplies | Choose only for through-hole prototyping or cost-sensitive non-automotive designs where SMT is unavailable. |
Compared with SAC8.5A-TB-E3 and 1.5KE8.5A, the SMCJ8.5AHE3_A/H uniquely combines AEC-Q101 qualification, SMC package thermal performance (RθJA = 75 °C/W), and full 1500 W surge capability-making it the only option qualified for production automotive power rail protection.
Availability
SMCJ8.5AHE3_A/H is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor interfaces, consumer USB power delivery systems, and telecom DC feeder protection requiring stable component supply and AEC-Q101 compliance.
Supply support for SMCJ8.5AHE3_A/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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and automotive-grade validation.
The SMCJ series was developed specifically for high-energy transient suppression in harsh-environment applications, targeting automotive, industrial, and telecom systems requiring robust, AEC-Q101-qualified TVS solutions in compact SMC packages.
FAQ
What is the clamping voltage of the SMCJ8.5AHE3_A/H under maximum rated surge current?
The SMCJ8.5AHE3_A/H has a maximum clamping voltage (VC) of 14.4 V when subjected to its rated peak pulse current (IPPM) of 104.2 A using the standard 10/1000 μs waveform. This value is measured at the device terminals under specified test conditions and represents the highest voltage that will appear across the protected circuit during a full-rated transient event. Designers must ensure downstream components tolerate this clamped voltage under worst-case surge conditions. The SMCJ8.5AHE3_A/H maintains this performance across its qualified operating temperature range.
Is the SMCJ8.5AHE3_A/H qualified for automotive applications?
Yes, the SMCJ8.5AHE3_A/H is explicitly AEC-Q101 qualified, as confirmed by Vishay's ordering code suffix "HE3" and documentation in the SMCJ5.0A–SMCJ188CA datasheet (Document Number 88394, Revision 09-Jan-2024). This qualification covers stress tests including temperature cycling, humidity bias, mechanical shock, and accelerated life testing required for automotive under-hood and cabin electronics. The SMCJ8.5AHE3_A/H is approved for use in engine control modules, body control units, and ADAS sensor interfaces where reliability under thermal and vibrational stress is mandatory.
What is the meaning of the "_A/H" suffix in SMCJ8.5AHE3_A/H?
The "_A/H" suffix in SMCJ8.5AHE3_A/H denotes the packaging configuration: "A" indicates the revision code (Revision A per Vishay's internal change control), and "H" specifies the preferred package code for 7-inch diameter plastic tape and reel delivery, with a base quantity of 850 units per reel. This matches Vishay's official ordering information table, where SMCJ5.0AHE3_A/H is listed alongside delivery mode "7\" diameter plastic tape and reel". The "HE3" portion confirms RoHS-compliant and AEC-Q101-qualified construction.
How does the SMCJ8.5AHE3_A/H compare to bidirectional variants like SMCJ8.5CA?
The SMCJ8.5AHE3_A/H is unidirectional, meaning it clamps only in reverse bias and conducts forward current up to 200 A (IFSM), whereas SMCJ8.5CA is bidirectional and symmetrical in both directions. The unidirectional SMCJ8.5AHE3_A/H offers lower leakage (<20 μA at 8.5 V) and is suited for DC rail protection where polarity is fixed, while SMCJ8.5CA is used in AC-coupled or floating signal lines. Both share identical VWM (8.5 V), PPPM (1500 W), and package (SMC), but only the HE3 version carries AEC-Q101 qualification.
What PCB layout guidance applies to the SMCJ8.5AHE3_A/H for optimal thermal and surge performance?
Vishay specifies mounting the SMCJ8.5AHE3_A/H on minimum 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal to achieve rated 1500 W surge capability and thermal resistance (RθJA = 75 °C/W). Traces to the device must be short and wide to minimize inductance, especially for high-di/dt transients. The cathode band must align with the protected line; anode connects to ground or return. Avoid thermal relief on pads, and ensure no silkscreen or solder mask encroachment on pad edges to maintain solder joint integrity during reflow and surge events. The SMCJ8.5AHE3_A/H requires no additional heatsinking under typical derated conditions.
SMCJ8.5AHE3_A/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:
- 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/H FAQ
1.How can I place an order for SMCJ8.5AHE3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ8.5AHE3_A/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 SMCJ8.5AHE3_A/H reliable?
The price and inventory of SMCJ8.5AHE3_A/H 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/H is usually 5 days.
3.What payment methods are accepted for SMCJ8.5AHE3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ8.5AHE3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ8.5AHE3_A/H?
SMCJ8.5AHE3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ8.5AHE3_A/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 SMCJ8.5AHE3_A/H?
For technical support, including SMCJ8.5AHE3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ8.5AHE3_A/H requirements.
6.How does Aetrix verify that SMCJ8.5AHE3_A/H is sourced from the original manufacturer or authorized distributors?
All SMCJ8.5AHE3_A/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 SMCJ8.5AHE3_A/H meets industry standards.
7.What is the process for return or replacement of SMCJ8.5AHE3_A/H?
All SMCJ8.5AHE3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ8.5AHE3_A/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 SMCJ8.5AHE3_A/H part is unused and in its original packaging.
Return procedure for SMCJ8.5AHE3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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