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Vishay General Semiconductor - Diodes Division SMAJ8.5AHE3/5A
- Part No.:
- SMAJ8.5AHE3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ8.5AHE3/5A.pdf
- Description:
- TVS DIODE 8.5VWM 14.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,519
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Product details
Overview
SMAJ8.5AHE3/5A from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMA (DO-214AC) package, designed to protect sensitive electronics against voltage transients induced by inductive load switching and lightning surges. 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 27.8 A peak pulse current (IPPM), and 400 W peak pulse power (PPPM) with 10/1000 μs waveform - used on ICs, MOSFETs, and sensor signal lines in automotive, industrial, and telecom systems.
For engineers reviewing the SMAJ8.5AHE3/5A datasheet, SMAJ8.5AHE3/5A pinout, SMAJ8.5AHE3/5A application, or SMAJ8.5AHE3/5A equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, thermal resistance (RθJA = 120 °C/W), junction temperature range (−55 to +150 °C), and packaging details for reliable circuit protection design and component selection.
Technical Context
This unidirectional TVS diode operates as a fast-acting shunt clamp during overvoltage events, leveraging a glass-passivated silicon junction to achieve sub-nanosecond response time and low incremental surge resistance. Its 14.4 V clamping voltage at 27.8 A ensures robust protection of downstream 5 V–12 V logic and power stages without excessive voltage overshoot.
The device is rated for 400 W peak pulse power (10/1000 μs), derated to 300 W above 78 V, and supports repetitive surge duty cycles up to 0.01 %. With 3.3 W steady-state power dissipation and RθJL = 30 °C/W, it enables reliable operation on standard PCB copper pads (0.2" × 0.2") without active cooling in space-constrained applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.5 V - Maximum reverse working voltage before clamping begins; defines safe operating margin for 5 V–8 V supply rails. |
| VBR (min/max) | 9.44 V / 10.4 V at IT = 1 mA - Confirmed breakdown threshold ensuring predictable turn-on under transient stress. |
| VC @ IPPM | 14.4 V at 27.8 A - Clamped voltage seen by protected circuit during worst-case 10/1000 μs surge; limits stress on downstream ICs. |
| PPPM | 400 W (10/1000 μs) - Peak energy-handling capability for single-event transients; validated per ANSI/IEEE C62.35. |
| ID @ VWM | 10 μA - Low leakage current preserves battery life and signal integrity in always-on sensor interfaces. |
| TJ max. | +150 °C - Enables use in under-hood automotive environments and industrial enclosures without derating. |
| RθJA | 120 °C/W - Thermal resistance from junction to ambient on standard 0.2" × 0.2" copper pads; informs board layout requirements. |
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. Polarity indicated by cathode band; unidirectional configuration only.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during forward conduction | Connected to ground or lower-potential node in unidirectional clamp configuration; forms return path during surge. |
| Cathode | Current exit terminal during reverse-biased clamping | Connected to protected line (e.g., I/O, power rail); conducts surge current to ground when V > VBR. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - suitable for engine control, ADAS, and infotainment modules. |
| 400 W peak pulse power | Withstands high-energy transients (e.g., ISO 7637-2 Pulse 1/2a/5a) without degradation when mounted on minimum recommended pad layout. |
| Low clamping ratio (VC/VBR ≈ 1.44) | Minimizes overvoltage exposure to protected devices - critical for 3.3 V and 5 V logic interfacing with legacy CAN or LIN buses. |
| MSL Level 1 (260 °C peak reflow) | Compatible with standard lead-free SMT assembly processes without moisture sensitivity concerns or baking requirements. |
| Glass passivated junction | Ensures stable VBR over lifetime and immunity to humidity-induced parameter drift in harsh industrial environments. |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 12 V power inputs in body control modules (BCM) against load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional shunt clamp placed between battery rail and DC-DC input, conducting surge current to chassis ground. Use Value: Limits transient voltage to ≤14.4 V, preventing damage to 16 V-rated buck converters and enabling compliance with ISO 16750-2. |
Use Scenario: Safeguarding analog outputs of pressure/temperature sensors connected to PLC analog input cards. IC Role / Device Role / Timing Role: Reverse-biased TVS on signal line (e.g., 4–20 mA loop) to clamp ESD and inductive kickback from solenoid drivers. Use Value: Maintains signal integrity with <10 μA leakage at 8.5 V, avoiding offset errors while surviving 8 kV contact ESD per IEC 61000-4-2. |
| Telecom Data Line Surge Protection | Consumer USB Port ESD Protection |
|
Use Scenario: Shielding RS-485 transceivers in base station backhaul equipment from lightning-induced surges on long cable runs. IC Role / Device Role / Timing Role: Paired unidirectional TVS on A/B differential lines, referenced to local ground plane with low-inductance layout. Use Value: Achieves <1 ns response time and clamps 1 kV/500 A surge to <15 V, preserving signal eye diagram and meeting ITU-T K.20/21 standards. |
Use Scenario: Adding secondary-level ESD protection on VBUS and D+/D− lines of USB 2.0 ports in smart home hubs. IC Role / Device Role / Timing Role: Standoff-rated TVS placed upstream of USB switch IC to absorb 15 kV air discharge before internal protection triggers. Use Value: Provides 400 W surge handling margin beyond USB-IF ESD spec, extending product lifecycle in high-touch consumer environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ8.5A-E3/5A | No AEC-Q101 qualification; commercial-grade only; identical VWM, VBR, VC, and PPPM specs. | Suitable for non-automotive industrial or consumer designs where automotive reliability certification is not required. | Select when cost sensitivity outweighs automotive qualification needs and full traceability is not mandated. |
| SMAJ8.5AHE3/61 | Same AEC-Q101 qualification and electrical specs; differs only in packaging - 7" tape/reel (1800 pcs) vs. 13" reel (7500 pcs). | Preferred for low-volume prototyping or small-batch production where smaller reels reduce inventory holding cost. | Choose for NPI phases or pilot runs where flexibility in order quantity and shorter lead times are prioritized. |
Compared with SMAJ8.5AHE3/5A, the E3/5A variant offers identical performance with automotive qualification and large-reel logistics, while the E3/61 provides the same reliability in smaller packaging for development use, and the non-HE3 version trades qualification for lower cost in non-automotive contexts.
Availability
SMAJ8.5AHE3/5A is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor systems, and telecom infrastructure requiring stable component supply with AEC-Q101 assurance and RoHS compliance.
Supply support for SMAJ8.5AHE3/5A 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, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMAJ series was engineered for high-energy transient suppression in space-constrained, high-reliability applications - particularly targeting automotive, industrial, and telecom systems demanding AEC-Q101 validation and consistent clamping performance.
FAQ
What is the clamping voltage of the SMAJ8.5AHE3/5A under a 10/1000 μs surge?
The SMAJ8.5AHE3/5A has a maximum clamping voltage (VC) of 14.4 V at 27.8 A peak pulse current (IPPM) with a 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and reflects the actual voltage imposed on the protected circuit during worst-case transient events - critical for verifying compatibility with downstream IC absolute maximum ratings.
Is SMAJ8.5AHE3/5A qualified for automotive applications?
Yes, SMAJ8.5AHE3/5A is AEC-Q101 qualified, as confirmed by Vishay's documentation and ordering code suffix "HE3". This qualification covers stress tests including high-temperature reverse bias (HTRB), temperature cycling, and ESD, making SMAJ8.5AHE3/5A suitable for under-hood and cabin electronics in passenger vehicles and commercial vehicles.
What is the thermal resistance of SMAJ8.5AHE3/5A, and how does it affect PCB layout?
SMAJ8.5AHE3/5A has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. This value directly informs minimum copper area requirements: reducing pad size increases RθJA, risking junction overheating during repetitive surges - so layouts must adhere to Vishay's recommended footprint to maintain safe TJ ≤ 150 °C.
How does the leakage current of SMAJ8.5AHE3/5A impact low-power sensor circuits?
SMAJ8.5AHE3/5A exhibits a maximum reverse leakage current (ID) of 10 μA at its 8.5 V stand-off voltage (VWM), measured at TA = 25 °C. This low leakage avoids measurable loading on high-impedance sensor outputs or battery-backed circuits - for example, it introduces <0.1 mV error across a 100 kΩ pull-up, preserving accuracy in precision analog front-ends.
What packaging format does SMAJ8.5AHE3/5A ship in, and is it compatible with automated SMT placement?
SMAJ8.5AHE3/5A ships in 13" diameter plastic tape and reel (7500 pcs per reel), with EIA-481-compliant carrier tape. Its SMA (DO-214AC) package features matte tin-plated leads and meets J-STD-002 solderability standards - fully compatible with high-speed pick-and-place machines and lead-free reflow profiles up to 260 °C peak (MSL Level 1).
SMAJ8.5AHE3/5A 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:
- 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):
- 27.8A
- Power - Peak Pulse:
- 400W
- 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-214AC (SMA)
SMAJ8.5AHE3/5A FAQ
1.How can I place an order for SMAJ8.5AHE3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ8.5AHE3/5A 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 SMAJ8.5AHE3/5A reliable?
The price and inventory of SMAJ8.5AHE3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ8.5AHE3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ8.5AHE3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ8.5AHE3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ8.5AHE3/5A?
SMAJ8.5AHE3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ8.5AHE3/5A 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 SMAJ8.5AHE3/5A?
For technical support, including SMAJ8.5AHE3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ8.5AHE3/5A requirements.
6.How does Aetrix verify that SMAJ8.5AHE3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ8.5AHE3/5A 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 SMAJ8.5AHE3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ8.5AHE3/5A?
All SMAJ8.5AHE3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ8.5AHE3/5A, 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 SMAJ8.5AHE3/5A part is unused and in its original packaging.
Return procedure for SMAJ8.5AHE3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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