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Vishay General Semiconductor - Diodes Division SMCJ8.5CAHE3/9AT
- Part No.:
- SMCJ8.5CAHE3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ8.5CAHE3/9AT.pdf
- Description:
- TVS DIODE 8.5VWM 14.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,028
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Product details
Overview
SMCJ8.5CAHE3/9AT from Vishay General Semiconductor is a bidirectional 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 maximum 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 SMCJ8.5CAHE3/9AT datasheet, SMCJ8.5CAHE3/9AT pinout, SMCJ8.5CAHE3/9AT application, or SMCJ8.5CAHE3/9AT equivalent, key selection considerations include bidirectional surge immunity, AEC-Q101 qualification for automotive use, low clamping ratio (VC/VBR ≈ 1.45), RoHS-compliant matte tin terminations, and compatibility with automated SMT placement on standard PCB pad layouts.
Technical Context
This TVS diode operates symmetrically in both directions due to its bidirectional construction, enabling protection of AC-coupled or differential signal lines without polarity constraints. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1 μA at VWM), while the low incremental surge resistance supports fast energy dissipation during ESD or lightning-induced transients.
The device is rated for TJ = –55 °C to +150 °C operation, meets MSL Level 1 per J-STD-020 (peak reflow 260 °C), and delivers consistent clamping performance across temperature when mounted on 8.0 mm × 8.0 mm copper pads - critical for thermal management in high-reliability industrial and automotive power rail protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.5 V - Maximum continuous reverse operating voltage before conduction begins; defines safe working margin for protected circuitry. |
| VBR min/max | 9.44 V / 10.4 V at IT = 1 mA - Confirmed breakdown range ensuring predictable turn-on under surge conditions. |
| VC @ IPPM | 14.4 V at 104.2 A - Clamping voltage limits downstream component stress during 10/1000 μs transients. |
| PPPM | 1500 W - Peak pulse power handling capacity determines survivability against IEC 61000-4-5 Level 4 surges. |
| ID @ VWM | <1 μA - Ultra-low reverse leakage preserves signal integrity and minimizes standby power loss. |
| TJ max | +150 °C - Junction temperature rating enables deployment in under-hood automotive environments and high-ambient industrial settings. |
| Package | SMC (DO-214AB) - Surface-mount outline with 7.75 mm × 6.22 mm footprint and 2.62 mm height; optimized for automated pick-and-place and thermal pad attachment. |
Pinout & Package
SMCJ8.5CAHE3/9AT uses a two-terminal SMC (DO-214AB) package with no polarity marking - consistent with bidirectional functionality. Terminals are matte tin-plated leads, solderable per J-STD-002 and JESD 22-B102, and meet JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional surge path | Either terminal serves as input/output for transient energy; no cathode band marking required. |
| Case (body) | Thermal and mechanical interface | Exposed metal slug provides primary heat conduction path to PCB copper; requires minimum 8.0 mm × 8.0 mm pad per terminal per datasheet fig. 2. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - suitable for engine control units and ADAS power rails. |
| Low clamping ratio (VC/VBR) | ≈1.45 - Minimizes overvoltage overshoot during clamping, reducing risk of latch-up or gate oxide damage in downstream MOSFETs and ICs. |
| MSL Level 1 rating | Compatible with standard lead-free reflow profiles up to 260 °C peak - eliminates moisture sensitivity concerns during assembly. |
| Glass passivated junction | Ensures stable VBR tolerance and long-term parameter stability under thermal and electrical stress - critical for field-deployed equipment. |
| 1500 W PPPM capability | Supports IEC 61000-4-5 4th edition surge immunity compliance (4 kV line-to-ground, 2 Ω source impedance) without derating. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 12 V battery-fed ECUs against load dump and alternator transients per ISO 7637-2 Pulse 5a. IC Role / Device Role / Timing Role: Bidirectional clamping element placed between power input and DC-DC converter input stage. Use Value: Limits transient voltage to ≤14.4 V, preventing overvoltage shutdown or damage to 16 V-rated input regulators in AEC-Q100 Grade 2 systems. |
Use Scenario: Safeguarding RS-485 transceivers and analog sensor front-ends in factory automation PLCs exposed to motor switching noise. IC Role / Device Role / Timing Role: Parallel-connected TVS on differential bus lines (A/B) and common-mode supply rail. Use Value: Clamps fast-rising EFT bursts (IEC 61000-4-4) within 1 ns response time, preserving signal integrity below 100 mVpp distortion threshold. |
| Telecom Line Card Surge Suppression | Consumer USB Port ESD Protection |
|
Use Scenario: Front-end protection of POTS line interface circuits in VoIP gateways subjected to lightning-induced surges. IC Role / Device Role / Timing Role: Primary surge absorber located before hybrid transformer and SLIC IC. Use Value: Absorbs 1500 W peak energy from 10/700 μs telecom surges (ITU-T K.21), maintaining <1 μA leakage to avoid baseline drift in bias networks. |
Use Scenario: Secondary-level ESD protection on USB 2.0 VBUS and D+/D− lines in portable media players. IC Role / Device Role / Timing Role: Low-capacitance TVS placed after primary fuse and upstream of USB switch IC. Use Value: Provides ±15 kV contact / ±20 kV air discharge ESD immunity (IEC 61000-4-2) without degrading 480 Mbps data eye due to symmetrical low capacitance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC8.5CA | Same VWM (8.5 V) and PPPM (1500 W), but smaller SMA package (DO-214AC); lower IPPM (92.6 A) and higher VC (15.0 V). | Limited to lower-energy surges; unsuitable for ISO 7637-2 Pulse 5a due to reduced thermal mass and clamping margin. | Select when board space is constrained and surge threat level is limited to IEC 61000-4-5 Level 3 (2 kV). |
| SMCJ8.5CAHM3/9AT | Identical electrical specs and AEC-Q101 qualification, but halogen-free molding compound and HM3 suffix instead of HE3. | No functional difference; used where halogen-free compliance is mandated by OEM environmental policy (e.g., EU automotive Tier 1). | Direct material substitution for HE3 when RoHS + halogen-free certification is required; same footprint and reflow profile. |
Compared with SAC8.5CA, SMCJ8.5CAHE3/9AT offers superior thermal robustness and lower clamping voltage for high-energy transients; compared with SMCJ8.5CAHM3/9AT, it shares identical protection performance but differs only in halogen content - making HE3 optimal for cost-sensitive AEC-Q101 applications without halogen restrictions.
Availability
SMCJ8.5CAHE3/9AT is available at Aetrix Electronics and suitable for automotive power distribution modules, industrial PLC I/O cards, telecom line interface units, and consumer USB-C power delivery circuits requiring stable component supply across multi-year production cycles.
Supply support for SMCJ8.5CAHE3/9AT 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 high-reliability diodes, MOSFETs, optoelectronics, and passive components for demanding industrial and automotive applications.
The SMCJ series is engineered specifically for high-power transient suppression in harsh environments - emphasizing low clamping ratio, AEC-Q101 qualification, and repeatable surge endurance across temperature extremes.
FAQ
What is the clamping voltage of SMCJ8.5CAHE3/9AT at its rated peak pulse current?
The SMCJ8.5CAHE3/9AT 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 per ANSI/IEEE C62.35 standards and confirmed in the Vishay datasheet revision 09-Jan-2024, Document Number 88394. The low VC ensures downstream components remain within safe operating voltage limits during surge events.
Is SMCJ8.5CAHE3/9AT suitable for automotive applications?
Yes, SMCJ8.5CAHE3/9AT is AEC-Q101 qualified and explicitly designated for automotive use via the "HE3" suffix, indicating RoHS-compliant and AEC-Q101 qualified construction. It meets requirements for under-hood and chassis-mounted modules, including thermal cycling, humidity testing, and surge immunity per ISO 7637-2. Its +150 °C TJ max and MSL Level 1 rating further support automotive manufacturing and field reliability.
How does the bidirectional design of SMCJ8.5CAHE3/9AT affect its circuit implementation?
The bidirectional design of SMCJ8.5CAHE3/9AT means it conducts identically in both polarities - eliminating the need for polarity-aware layout or orientation during placement. This simplifies protection of AC-coupled lines (e.g., RS-485, CAN FD), differential sensors, or ungrounded power rails. Unlike unidirectional variants, SMCJ8.5CAHE3/9AT has no cathode band marking and delivers matched VBR and VC in either direction, verified per datasheet Table 1.
What is the thermal resistance of SMCJ8.5CAHE3/9AT, and how does it impact PCB layout?
SMCJ8.5CAHE3/9AT has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W and junction-to-lead (RθJL) of 15 °C/W when mounted on the recommended 8.0 mm × 8.0 mm copper pads per terminal. To maintain safe junction temperatures under repeated surge duty, PCB layout must replicate this pad area and ensure solid thermal vias to internal ground planes - especially critical in automotive and industrial applications where ambient temperatures exceed 85 °C.
Does SMCJ8.5CAHE3/9AT meet RoHS and halogen-free requirements?
SMCJ8.5CAHE3/9AT is RoHS-compliant per EU Directive 2011/65/EU, as indicated by the "HE3" suffix, but it is not halogen-free. For halogen-free compliance, the equivalent part is SMCJ8.5CAHM3/9AT. Both versions share identical electrical specifications and AEC-Q101 qualification; the distinction lies solely in the molding compound composition - confirmed in Vishay's ordering information table (Document 88394, page 3).
SMCJ8.5CAHE3/9AT 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)
SMCJ8.5CAHE3/9AT FAQ
1.How can I place an order for SMCJ8.5CAHE3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ8.5CAHE3/9AT 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 SMCJ8.5CAHE3/9AT reliable?
The price and inventory of SMCJ8.5CAHE3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ8.5CAHE3/9AT is usually 5 days.
3.What payment methods are accepted for SMCJ8.5CAHE3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ8.5CAHE3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ8.5CAHE3/9AT?
SMCJ8.5CAHE3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ8.5CAHE3/9AT 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 SMCJ8.5CAHE3/9AT?
For technical support, including SMCJ8.5CAHE3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ8.5CAHE3/9AT requirements.
6.How does Aetrix verify that SMCJ8.5CAHE3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCJ8.5CAHE3/9AT 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 SMCJ8.5CAHE3/9AT meets industry standards.
7.What is the process for return or replacement of SMCJ8.5CAHE3/9AT?
All SMCJ8.5CAHE3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ8.5CAHE3/9AT, 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 SMCJ8.5CAHE3/9AT part is unused and in its original packaging.
Return procedure for SMCJ8.5CAHE3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ8.5CAHE3/9AT Tags
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