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Vishay General Semiconductor - Diodes Division SMA5J8.5CAHM3/I
- Part No.:
- SMA5J8.5CAHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMA5J8.5CAHM3/I.pdf
- Description:
- TVS DIODE 8.5VWM 14.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:7,172
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Product details
Overview
SMA5J8.5CAHM3/I from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for robust overvoltage protection on signal and power 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 34.7 A peak pulse current, and 500 W peak pulse power rating with 10/1000 μs waveform - deployed in automotive sensor interfaces and industrial I/O protection.
For engineers reviewing the SMA5J8.5CAHM3/I datasheet, SMA5J8.5CAHM3/I pinout, SMA5J8.5CAHM3/I application, or SMA5J8.5CAHM3/I equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification (via HM3 suffix), halogen-free RoHS compliance, and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This device operates as a voltage-clamped surge protector using an avalanche junction structure, with symmetrical reverse/forward conduction enabling bidirectional transient suppression without polarity sensitivity. Its low incremental surge resistance and fast response time (<1 ns) ensure effective clamping of ESD and inductive switching transients before downstream ICs are damaged.
The SMA5J8.5CAHM3/I is thermally rated for TJ = –55 °C to +150 °C, with RθJA = 80 °C/W and RθJL = 25 °C/W, and meets MSL Level 1 per J-STD-020 at 260 °C peak reflow. The HM3 suffix confirms halogen-free, RoHS-compliant construction and AEC-Q101 qualification for automotive-grade reliability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.5 V - Maximum continuous reverse operating voltage before clamping initiates; sets safe margin below system supply or signal swing. |
| VBR (min/max) | 9.44 V / 10.4 V at 1 mA - Confirmed breakdown threshold range; ensures predictable turn-on across temperature and unit variation. |
| VC @ IPPM | 14.4 V at 34.7 A - Clamped voltage during 500 W transient; defines worst-case stress on protected circuitry. |
| PPPM | 500 W - Peak pulse power handling with 10/1000 μs waveform; supports high-energy surges from load dump or lightning-induced coupling. |
| IPPM | 34.7 A - Peak surge current capacity; determines minimum trace width and PCB layout robustness required for protection path. |
| TJ Range | –55 °C to +150 °C - Full automotive-grade junction temperature range; enables deployment in engine bay or under-hood modules. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile plastic case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Bidirectional construction means no polarity marking; terminals are symmetric and interchangeable.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional surge conduction path | No defined anode/cathode; both terminals function identically for transient clamping in either direction. |
| Case (body) | Thermal and mechanical interface | Plastic body provides electrical isolation; thermal path relies on soldered pad area (5.0 mm × 5.0 mm recommended per terminal). |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive applications including powertrain and ADAS sensor interfaces per stress test requirements. |
| Halogen-free & RoHS-compliant | Meets environmental compliance mandates for global automotive and industrial OEMs without compromising surge performance. |
| MSL Level 1 moisture sensitivity | Enables standard SMT reflow without dry-baking; compatible with high-volume automated assembly lines. |
| Low incremental surge resistance | Minimizes VC overshoot during fast transients, improving protection margin for 3.3 V and 5 V logic interfaces. |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting CAN, LIN, or analog sensor inputs (e.g., pressure, temperature) from load dump and ISO 7637-2 pulses in vehicle ECUs. IC Role / Device Role / Timing Role: Bidirectional TVS clamp placed directly at connector or IC input pin to shunt transients before signal conditioning circuitry. Use Value: Maintains signal integrity under 12 V/24 V system surges up to 500 W while meeting AEC-Q101 reliability requirements. |
Use Scenario: Safeguarding digital and analog I/O channels on programmable logic controllers exposed to relay coil flyback and EMI in factory automation. IC Role / Device Role / Timing Role: Primary overvoltage clamp on field-side signal lines, coordinated with series impedance and filtering. Use Value: Enables >30 kV ESD immunity (IEC 61000-4-2) and 1 kV surge immunity (IEC 61000-4-5) without derating at elevated ambient temperatures. |
| Consumer Power Adapter Input | Telecom Line Interface Protection |
Use Scenario: Input-stage surge suppression on AC-DC adapters and USB-C PD chargers subjected to mains-borne transients and hot-plug events. IC Role / Device Role / Timing Role: First-line transient absorber upstream of bridge rectifier and primary-side controller. Use Value: Withstands repetitive 500 W pulses without degradation, supporting UL 62368-1 and IEC 61000-4-5 compliance testing. |
Use Scenario: Protection of Ethernet PHY, DSL, or POTS line drivers against lightning-induced surges and induced transients on outdoor cabling. IC Role / Device Role / Timing Role: Secondary-level TVS in conjunction with gas discharge tubes (GDTs) and common-mode chokes. Use Value: Low clamping voltage (14.4 V) prevents latch-up in 3.3 V/5 V PHY ICs while surviving >100 surges at rated energy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional TVS protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMA5J8.5CAHE3/I | Same electrical specs; RoHS-compliant but not halogen-free; AEC-Q101 qualified (HE3 suffix); no MSL Level 1 reflow guarantee. | Limited to commercial-automotive hybrid use where halogen content is unrestricted; less suitable for Tier 1 automotive sourcing. | Select when halogen-free requirement is waived and cost optimization is prioritized over full automotive process compliance. |
| SMA6J8.5CAHM3/I | 600 W PPPM, same VWM/VBR/VC; larger SMA package variant (DO-214AC with enhanced thermal pad); higher IPPM (40.8 A). | Better suited for higher-energy surge environments (e.g., 24 V truck systems, heavy industrial motor drives) requiring extended surge endurance. | Choose when system-level surge testing exceeds 500 W or long-term reliability under repeated transients is critical. |
Compared with SMA5J8.5CAHE3/I, the SMA5J8.5CAHM3/I adds halogen-free compliance and guaranteed MSL Level 1 handling; versus SMA6J8.5CAHM3/I, it trades 100 W peak power for tighter board space and lower thermal mass - ideal for compact automotive modules where 500 W margin suffices.
Availability
SMA5J8.5CAHM3/I is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O protection, and telecom line interface designs requiring stable component supply, AEC-Q101 validation, and halogen-free compliance.
Supply support for SMA5J8.5CAHM3/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 high-reliability diodes, MOSFETs, optoelectronics, and passive components for automotive, industrial, and computing markets.
The SMA5J series is part of Vishay's TRANSZORB® TVS platform, engineered specifically for high-power-density, surface-mount transient suppression in harsh environments where AEC-Q101 qualification and consistent clamping performance are mandatory.
FAQ
What is the clamping voltage of the SMA5J8.5CAHM3/I under maximum surge conditions?
The SMA5J8.5CAHM3/I exhibits a maximum clamping voltage (VC) of 14.4 V when subjected to its rated peak pulse current of 34.7 A using the standardized 10/1000 μs waveform. This value is measured at TA = 25 °C on the recommended 5.0 mm × 5.0 mm copper pad layout and defines the upper voltage limit imposed on protected circuitry during transient events. The SMA5J8.5CAHM3/I maintains this clamping performance across its full operating temperature range.
Is the SMA5J8.5CAHM3/I suitable for automotive applications?
Yes, the SMA5J8.5CAHM3/I is explicitly qualified to AEC-Q101 standards, as confirmed by the HM3 suffix in its ordering code. It supports operation from –55 °C to +150 °C, meets MSL Level 1 reflow requirements, and is halogen-free and RoHS-compliant - fulfilling Tier 1 automotive sourcing mandates for engine control units, body electronics, and ADAS sensor modules. The SMA5J8.5CAHM3/I is validated for sustained reliability under automotive stress profiles.
How does the bidirectional design of the SMA5J8.5CAHM3/I affect its circuit implementation?
The SMA5J8.5CAHM3/I has no polarity marking and conducts identically in both directions, eliminating orientation concerns during PCB layout and automated placement. This symmetry allows direct placement across differential lines (e.g., CAN H/L), AC-coupled signals, or ungrounded power rails without risk of reverse installation. Its bidirectional behavior is intrinsic to the device structure and requires no external biasing - the SMA5J8.5CAHM3/I functions identically regardless of voltage polarity applied across its terminals.
What is the thermal resistance specification for the SMA5J8.5CAHM3/I?
The SMA5J8.5CAHM3/I has a typical junction-to-ambient thermal resistance (RθJA) of 80 °C/W and a junction-to-lead resistance (RθJL) of 25 °C/W, measured under standard JEDEC test conditions with 5.0 mm × 5.0 mm copper pads per terminal. These values define the steady-state and transient thermal performance envelope and must be used in thermal modeling to ensure junction temperature remains within the –55 °C to +150 °C limit during surge events. The SMA5J8.5CAHM3/I's thermal metrics are validated per JESD51-14.
Does the SMA5J8.5CAHM3/I require derating at elevated ambient temperatures?
Yes, the SMA5J8.5CAHM3/I must be derated above TA = 25 °C per Figure 2 in Vishay document 88875. Its peak pulse power (PPPM) decreases linearly to zero at TA = 150 °C, with a derating factor of approximately 4.2 W/°C. For example, at TA = 85 °C, the usable PPPM is reduced to ~250 W. This derating applies to all surge ratings and is inherent to the SMA5J8.5CAHM3/I's silicon and package physics.
SMA5J8.5CAHM3/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- 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):
- 34.7A
- Power - Peak Pulse:
- 500W
- Power Line Protection:
- No
- Applications:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMA5J8.5CAHM3/I FAQ
1.How can I place an order for SMA5J8.5CAHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA5J8.5CAHM3/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 SMA5J8.5CAHM3/I reliable?
The price and inventory of SMA5J8.5CAHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMA5J8.5CAHM3/I is usually 5 days.
3.What payment methods are accepted for SMA5J8.5CAHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA5J8.5CAHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA5J8.5CAHM3/I?
SMA5J8.5CAHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA5J8.5CAHM3/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 SMA5J8.5CAHM3/I?
For technical support, including SMA5J8.5CAHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA5J8.5CAHM3/I requirements.
6.How does Aetrix verify that SMA5J8.5CAHM3/I is sourced from the original manufacturer or authorized distributors?
All SMA5J8.5CAHM3/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 SMA5J8.5CAHM3/I meets industry standards.
7.What is the process for return or replacement of SMA5J8.5CAHM3/I?
All SMA5J8.5CAHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMA5J8.5CAHM3/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 SMA5J8.5CAHM3/I part is unused and in its original packaging.
Return procedure for SMA5J8.5CAHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMA5J8.5CAHM3/I Tags
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Diodes Incorporated
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