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Vishay General Semiconductor - Diodes Division SMA5J8.5AHM3_A/I
- Part No.:
- SMA5J8.5AHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMA5J8.5AHM3_A/I.pdf
- Description:
- TVS DIODE 8.5VWM 14.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:3,778
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Product details
Overview
SMA5J8.5AHM3_A/I from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for high-energy surge protection on power 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 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 SMA5J8.5AHM3_A/I datasheet, SMA5J8.5AHM3_A/I pinout, SMA5J8.5AHM3_A/I application, or SMA5J8.5AHM3_A/I equivalent, key selection criteria include clamping performance under 34.7 A surge, thermal resistance (RθJA = 80 °C/W), AEC-Q101 qualification status, unidirectional polarity marking, and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: when reverse voltage exceeds VWM = 8.5 V, it avalanches at VBR (min 9.44 V, max 10.4 V) and clamps transients to ≤14.4 V at 34.7 A. Its glass-passivated junction ensures stable leakage (<1.0 µA at VWM) and fast response time (<1 ns).
Rated for -55 °C to +150 °C junction temperature, it delivers 500 W peak pulse power under JEDEC-standard 10/1000 µs waveform with derating above 25 °C per Fig. 2. The SMA (DO-214AC) package supports MSL Level 1 handling and 260 °C reflow peak temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.5 V - maximum continuous reverse operating voltage before avalanche conduction begins |
| VBR (min/max) | 9.44 V / 10.4 V at 1 mA - guaranteed breakdown range defining turn-on threshold tolerance |
| VC @ IPPM | 14.4 V at 34.7 A - clamped voltage during 500 W surge, limiting downstream IC stress |
| PPPM | 500 W - peak pulse power handling capability with 10/1000 µs waveform per Fig. 1 |
| IPPM | 34.7 A - maximum non-repetitive peak surge current the device safely clamps |
| RθJA | 80 °C/W - thermal resistance from junction to ambient, critical for PCB pad layout design |
| TJ max | +150 °C - maximum allowable junction temperature, enabling operation in under-hood automotive environments |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102; cathode indicated by band at one end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / reverse surge return path | Connected to protected line ground or low-side reference; forms current loop during clamping |
| Cathode (banded end) | Avalanche conduction terminal / surge sink node | Connected to protected line (e.g., 12 V rail or signal trace); conducts surge current to ground when VREV > VBR |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD per AEC standard |
| Halogen-free & RoHS-compliant (HM3 suffix) | Meets environmental compliance requirements for modern automotive and industrial manufacturing |
| MSL Level 1, 260 °C peak reflow | Enables single-pass lead-free reflow without moisture sensitivity concerns or baking |
| Glass-passivated junction | Ensures stable VBR tolerance, low leakage (<1.0 µA), and long-term parameter stability |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients, improving protection margin for 3.3 V/5 V ICs |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from load dump and inductive switching spikes in engine control units. IC Role / Device Role / Timing Role: Unidirectional shunt TVS placed between signal line and chassis ground, clamping transients within nanoseconds. Use Value: Limits induced surges to ≤14.4 V, preserving integrity of 5 V tolerant receivers and preventing latch-up in microcontroller GPIOs. |
Use Scenario: Safeguarding digital input modules in programmable logic controllers exposed to relay coil flyback and field wiring ESD events. IC Role / Device Role / Timing Role: Standoff-rated TVS on 24 V DC input channels, conducting surge energy away from optocoupler input stages. Use Value: Withstands 500 W pulses without degradation, maintaining channel isolation integrity over 100,000+ surge events per IEC 61000-4-5 Level 4. |
| Consumer Power Adapter Output | Telecom Line Interface Protection |
Use Scenario: Secondary-side overvoltage suppression on 5 V/9 V USB PD adapter outputs subject to capacitor discharge and hot-plug transients. IC Role / Device Role / Timing Role: Fast-acting clamp parallel to output capacitor, triggered before downstream LDO or USB controller damage occurs. Use Value: Clamps 34.7 A surges at 14.4 V, ensuring output remains within ±5 % regulation window during transient recovery. |
Use Scenario: Primary protection for Ethernet PHY power rails (e.g., 3.3 V bias supply) against lightning-induced surges coupled via magnetics. IC Role / Device Role / Timing Role: Low-capacitance unidirectional TVS on DC bias line, coordinated with gas discharge tube (GDT) front-end. Use Value: Provides sub-1 ns response and <1.0 µA leakage at 8.5 V, avoiding signal distortion while enabling multi-stage protection architecture. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMA5J8.5AHE3_A/I | Same electrical specs, but RoHS-compliant (E3) without halogen-free certification; not AEC-Q101 qualified | Suitable for commercial/industrial use only; excluded from automotive production due to missing AEC-Q101 validation | Select SMA5J8.5AHM3_A/I when halogen-free content and automotive qualification are mandatory per OEM spec. |
| SMA6J8.5A-M3 | 600 W PPPM, same VWM/VBR, higher IPPM = 41.2 A, identical SMA package | Provides 20 % higher surge margin; requires verification of board-level thermal dissipation capability | Choose SMA6J8.5A-M3 where system-level surge testing exceeds IEC 61000-4-5 Level 4 or repeated surge exposure is expected. |
Compared with SMA5J8.5AHE3_A/I, SMA5J8.5AHM3_A/I adds halogen-free construction and AEC-Q101 qualification without sacrificing clamping performance; versus SMA6J8.5A-M3, it trades 100 W peak power for tighter thermal footprint and proven qualification scope in cost-sensitive automotive modules.
Availability
SMA5J8.5AHM3_A/I is available at Aetrix Electronics and suitable for automotive sensor modules, industrial PLC I/O cards, and consumer power adapter designs requiring stable component supply with full AEC-Q101 traceability and halogen-free compliance.
Supply support for SMA5J8.5AHM3_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, efficiency, and application-specific optimization.
The SMA5J series is engineered for high-power-density transient suppression in space-constrained automotive and industrial systems, delivering robust 500 W surge handling in the compact SMA (DO-214AC) footprint.
FAQ
What is the clamping voltage of the SMA5J8.5AHM3_A/I under maximum rated surge current?
The SMA5J8.5AHM3_A/I clamps to a maximum 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 per test condition in the Vishay datasheet (Document Number: 88875, Rev. 09-Jan-2024) and defines the upper voltage limit imposed on protected circuitry during surge events. Maintaining this low clamping level ensures compatibility with 5 V and 3.3 V logic interfaces downstream of the SMA5J8.5AHM3_A/I.
Is the SMA5J8.5AHM3_A/I qualified for automotive applications?
Yes, the SMA5J8.5AHM3_A/I is AEC-Q101 qualified, as confirmed by its HM3 suffix and explicit listing in Vishay's automotive-grade ordering codes. This qualification covers stress tests including temperature cycling, high-temperature reverse bias (HTRB), and electrostatic discharge (ESD), making the SMA5J8.5AHM3_A/I suitable for under-hood and cabin electronics where reliability across -40 °C to +125 °C ambient is required.
What does the "HM3" suffix indicate in SMA5J8.5AHM3_A/I?
The "HM3" suffix in SMA5J8.5AHM3_A/I denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. It distinguishes this variant from E3 (RoHS only) and HE3 (AEC-Q101 + RoHS, not halogen-free). The "_A/I" portion specifies revision A and tape-and-reel packaging in 13-inch reels (7500 units), per Vishay's ordering information table in document 88875.
How does the SMA5J8.5AHM3_A/I compare to bidirectional TVS diodes like SMA5J8.5CA?
The SMA5J8.5AHM3_A/I is unidirectional and intended for DC-biased lines where polarity is fixed (e.g., 12 V supply rails), offering lower leakage (<1.0 µA at 8.5 V) and no reverse conduction path. In contrast, SMA5J8.5CA is bidirectional, suited for AC or floating signals (e.g., data lines), but exhibits doubled leakage limits per datasheet note (3). The SMA5J8.5AHM3_A/I cannot substitute SMA5J8.5CA in AC-coupled applications without circuit redesign.
What PCB pad layout is recommended for optimal thermal performance of the SMA5J8.5AHM3_A/I?
Vishay specifies mounting the SMA5J8.5AHM3_A/I on 0.2" x 0.2" (5.0 mm x 5.0 mm) copper pads per terminal to achieve the rated 500 W peak pulse power and RθJA = 80 °C/W. Smaller pads increase thermal resistance and reduce surge capability; internal copper planes and thermal vias beneath pads further improve heat dissipation. Layout adherence is essential to maintain clamping performance and avoid premature failure during repetitive surge events.
SMA5J8.5AHM3_A/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:
- 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):
- 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)
SMA5J8.5AHM3_A/I FAQ
1.How can I place an order for SMA5J8.5AHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA5J8.5AHM3_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 SMA5J8.5AHM3_A/I reliable?
The price and inventory of SMA5J8.5AHM3_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 SMA5J8.5AHM3_A/I is usually 5 days.
3.What payment methods are accepted for SMA5J8.5AHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA5J8.5AHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA5J8.5AHM3_A/I?
SMA5J8.5AHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA5J8.5AHM3_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 SMA5J8.5AHM3_A/I?
For technical support, including SMA5J8.5AHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA5J8.5AHM3_A/I requirements.
6.How does Aetrix verify that SMA5J8.5AHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMA5J8.5AHM3_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 SMA5J8.5AHM3_A/I meets industry standards.
7.What is the process for return or replacement of SMA5J8.5AHM3_A/I?
All SMA5J8.5AHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMA5J8.5AHM3_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 SMA5J8.5AHM3_A/I part is unused and in its original packaging.
Return procedure for SMA5J8.5AHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMA5J8.5AHM3_A/I Tags
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