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Vishay General Semiconductor - Diodes Division SMCJ8.5CAHE3/57T
- Part No.:
- SMCJ8.5CAHE3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ8.5CAHE3/57T.pdf
- Description:
- TVS DIODE 8.5VWM 14.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMCJ8.5CAHE3/57T from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, designed for clamping ESD and surge transients on signal/power lines. It features 8.5 V stand-off voltage (VWM), 14.4 V maximum clamping voltage (VC) at 104.2 A peak pulse current (IPPM), and 1500 W peak pulse power (PPPM) with 10/1000 µs waveform - used to protect automotive sensor interfaces, industrial I/O ports, and telecom line drivers.
For engineers reviewing the SMCJ8.5CAHE3/57T datasheet, SMCJ8.5CAHE3/57T pinout, SMCJ8.5CAHE3/57T application, or SMCJ8.5CAHE3/57T equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, low clamping ratio (VC/VWM = 1.69), MSL Level 1 moisture sensitivity, and compatibility with automated SMT placement on 8 mm × 8 mm copper pads.
Technical Context
The SMCJ8.5CAHE3/57T operates as a silicon avalanche diode with symmetrical breakdown in both directions, enabling protection of AC-coupled or floating signal paths without polarity concerns. Its glass-passivated junction ensures stable leakage (<1 μA at VWM) and repeatable clamping performance across temperature (-55 °C to +150 °C).
It delivers 1500 W surge handling per 10/1000 µs waveform under standardized test conditions, with thermal resistance RθJA = 75 °C/W and RθJL = 15 °C/W - supporting reliable operation in compact PCB layouts when mounted on minimum recommended 8.0 mm × 8.0 mm copper pads per terminal.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.5 V - maximum continuous reverse operating voltage before clamping begins; defines safe working range for protected circuitry. |
| VBR (min/max) | 9.44 V / 10.4 V at IT = 1 mA - guaranteed avalanche initiation window; ensures predictable turn-on across production lots. |
| VC @ IPPM | 14.4 V at 104.2 A - clamping voltage during 10/1000 µs surge; limits downstream voltage stress to <14.4 V under worst-case transient. |
| PPPM | 1500 W - peak pulse power rating; enables robust protection against IEC 61000-4-5 Level 4 surges (4 kV/2 Ω) on 24 V lines. |
| ID @ VWM | <1 μA - ultra-low reverse leakage at stand-off voltage; prevents signal distortion or bias shift in high-impedance analog/sensor circuits. |
| TJ max. | +150 °C - maximum junction temperature; supports under-hood automotive use and industrial environments with elevated ambient temps. |
| Package | SMC (DO-214AB) - surface-mount package with 7.75 mm × 6.22 mm footprint and 2.62 mm height; compatible with standard SMT reflow profiles (peak 260 °C). |
Pinout & Package
SMCJ8.5CAHE3/57T uses the SMC (DO-214AB) package: a two-terminal, non-polarized surface-mount device. Bidirectional construction means neither terminal is designated anode or cathode; no band marking is present. Terminals are matte tin-plated leads, solderable per J-STD-002 and JESD 22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal 1 | Transient input/output node | Connects to line under protection (e.g., CAN_H, RS-485 A, sensor supply); bidirectional symmetry allows either orientation. |
| Terminal 2 | Transient input/output node | Connects to return path (e.g., CAN_L, RS-485 B, GND); completes clamping loop with Terminal 1 during overvoltage events. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control modules, ADAS sensors, and infotainment interfaces per stress test requirements. |
| 1500 W peak pulse power | Withstands repeated 10/1000 µs surges up to 104.2 A - sufficient for IEC 61000-4-5 Level 4 (4 kV) on 24 V systems with 2 Ω source impedance. |
| Low clamping ratio (VC/VWM = 1.69) | Minimizes voltage overshoot during transients - critical for protecting 12 V–24 V logic interfaces and microcontroller GPIOs. |
| MSL Level 1, 260 °C peak reflow | Enables single-pass lead-free reflow assembly without moisture-related popcorn failure or delamination risk. |
| Glass passivated junction | Ensures long-term stability of VBR and ID parameters across temperature cycling and humidity exposure in harsh environments. |
Applications
| Automotive Sensor Protection | Industrial RS-485 Interface |
|---|---|
Use Scenario: Protecting LIN/CAN bus nodes and pressure/temperature sensor outputs from load dump and ISO 7637-2 pulses in vehicle ECUs. IC Role / Device Role / Timing Role: Bidirectional TVS clamp placed between signal line and chassis ground to shunt transients before reaching MCU or transceiver IC. Use Value: Limits voltage excursion to ≤14.4 V during 100 A surge events, preserving signal integrity and preventing latch-up in AEC-Q100 qualified microcontrollers. |
Use Scenario: Safeguarding differential data lines in factory automation PLCs and motor drives exposed to inductive switching noise. IC Role / Device Role / Timing Role: Line-to-line and line-to-ground transient suppressor on RS-485 A/B terminals, placed adjacent to transceiver IC. Use Value: Maintains signal eye diagram integrity by clamping common-mode surges up to ±1500 W without adding capacitance (>100 pF) that would degrade 10 Mbps data rates. |
| Telecom Power Feeding | Consumer USB-C Port Protection |
Use Scenario: Protecting PoE-powered devices (e.g., IP cameras, wireless APs) from lightning-induced surges on 48 V DC feed lines. IC Role / Device Role / Timing Role: Primary surge clamp on DC input rail upstream of DC/DC converter, configured in parallel with bulk capacitor. Use Value: Absorbs 1500 W transient energy while holding rail voltage below 15 V - preventing overvoltage shutdown of downstream PMICs and Ethernet PHYs. |
Use Scenario: Guarding USB-C CC and VBUS lines in portable chargers and docking stations against ESD and hot-swap transients. IC Role / Device Role / Timing Role: Secondary-level TVS on high-speed interface lines where low capacitance and fast response (<1 ns) are mandatory. Use Value: Delivers sub-15 V clamping at 30 A ESD contact discharge (IEC 61000-4-2 Level 4), meeting USB-IF compliance without compromising signal rise time. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ8.5CAHE3/A | Lower PPPM (400 W), smaller SMA package (DO-214AC), same VWM/VC specs but reduced surge margin. | Suitable for space-constrained consumer electronics; insufficient for automotive load-dump immunity. | Select when board area is critical and surge threat level is limited to IEC 61000-4-2 ESD only. |
| SMCJ8.5CAHM3/57T | Identical electrical specs and AEC-Q101 qualification; halogen-free molding compound (per JEDEC J-STD-020). | Required for RoHS-compliant, halogen-free manufacturing programs in EU automotive supply chains. | Choose when material compliance (halogen-free + RoHS) is mandated, with no trade-off in performance or reliability. |
Compared with SMAJ8.5CAHE3/A, SMCJ8.5CAHE3/57T provides 275% higher surge power handling and better thermal dissipation via larger SMC package; versus SMCJ8.5CAHM3/57T, it offers identical protection performance but uses standard RoHS-compliant (non-halogen-free) epoxy - simplifying procurement where halogen restrictions do not apply.
Availability
SMCJ8.5CAHE3/57T is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial RS-485 networks, and telecom power feeding requiring stable component supply, AEC-Q101 traceability, and full MSL Level 1 reflow compatibility.
Supply support for SMCJ8.5CAHE3/57T 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, MOSFETs, optoelectronics, and passive components with emphasis on reliability, ruggedness, and application-specific validation.
The SMCJ series is engineered for high-energy transient suppression in automotive, industrial, and telecom infrastructure - delivering consistent clamping performance under repetitive surge stress and extended temperature operation.
FAQ
What does the "CA" suffix indicate in SMCJ8.5CAHE3/57T?
The "CA" suffix denotes a bidirectional configuration - meaning the SMCJ8.5CAHE3/57T clamps voltage transients equally in both directions, with no anode/cathode polarity. This makes it ideal for protecting AC-coupled lines like RS-485, CAN, or transformer-isolated interfaces where signal polarity alternates or is undefined. Unlike unidirectional variants (e.g., SMCJ8.5A), the SMCJ8.5CAHE3/57T has no band marking and exhibits symmetric VBR min/max values (9.44 V / 10.4 V) in either direction.
Is SMCJ8.5CAHE3/57T qualified for automotive use?
Yes, SMCJ8.5CAHE3/57T is AEC-Q101 qualified - verified per stress tests including high-temperature operating life, temperature cycling, and ESD. The "HE3" suffix explicitly indicates RoHS-compliant construction with AEC-Q101 qualification, making it suitable for under-hood and cabin applications such as body control modules, ADAS camera interfaces, and battery management system signal conditioning. Full qualification documentation is available in Vishay's certified test reports.
What is the maximum clamping voltage of SMCJ8.5CAHE3/57T during a surge event?
The maximum clamping voltage (VC) of SMCJ8.5CAHE3/57T is 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 defined test conditions (mounted on 8.0 mm × 8.0 mm copper pads) and represents the upper limit of voltage seen by downstream circuitry during worst-case surge events - critical for ensuring compatibility with 12 V or 24 V logic-level ICs.
How does the SMCJ8.5CAHE3/57T compare to SMAJ-series TVS diodes?
SMCJ8.5CAHE3/57T delivers 1500 W peak pulse power - 3.75× higher than the 400 W rating of SMAJ8.5CAHE3/A - due to its larger SMC (DO-214AB) package versus SMA (DO-214AC). This translates directly to higher surge current handling (104.2 A vs. ~27 A) and improved thermal dissipation (RθJL = 15 °C/W). While both share identical VWM (8.5 V) and VC (14.4 V), the SMCJ8.5CAHE3/57T is specified for demanding applications like automotive load dump and industrial 48 V PoE, whereas SMAJ variants target space-limited consumer designs.
What PCB layout guidance applies to SMCJ8.5CAHE3/57T for optimal surge performance?
For optimal transient energy handling, mount SMCJ8.5CAHE3/57T on minimum 8.0 mm × 8.0 mm copper pads per terminal - as specified in Vishay's datasheet Figure 2 and thermal characterization. Avoid narrow traces between the device and protected line/GND; use short, wide copper pours to minimize inductance. Place the TVS as close as possible to the connector or IC pin being protected, with ground return path routed directly to a solid ground plane - not daisy-chained through other components - to ensure clamping occurs before voltage overshoot reaches sensitive nodes.
SMCJ8.5CAHE3/57T 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:
- -
- Bidirectional Channels:
- 1
- 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)
SMCJ8.5CAHE3/57T FAQ
1.How can I place an order for SMCJ8.5CAHE3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ8.5CAHE3/57T 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 SMCJ8.5CAHE3/57T reliable?
The price and inventory of SMCJ8.5CAHE3/57T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ8.5CAHE3/57T is usually 5 days.
3.What payment methods are accepted for SMCJ8.5CAHE3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ8.5CAHE3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ8.5CAHE3/57T?
SMCJ8.5CAHE3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ8.5CAHE3/57T 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 SMCJ8.5CAHE3/57T?
For technical support, including SMCJ8.5CAHE3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ8.5CAHE3/57T requirements.
6.How does Aetrix verify that SMCJ8.5CAHE3/57T is sourced from the original manufacturer or authorized distributors?
All SMCJ8.5CAHE3/57T 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 SMCJ8.5CAHE3/57T meets industry standards.
7.What is the process for return or replacement of SMCJ8.5CAHE3/57T?
All SMCJ8.5CAHE3/57T units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ8.5CAHE3/57T, 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 SMCJ8.5CAHE3/57T part is unused and in its original packaging.
Return procedure for SMCJ8.5CAHE3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ8.5CAHE3/57T Tags
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