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Vishay General Semiconductor - Diodes Division SMAJ8.5A-E3/61
- Part No.:
- SMAJ8.5A-E3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ8.5A-E3/61.pdf
- Description:
- TVS DIODE 8.5VWM 14.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMAJ8.5A-E3/61 from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping voltage transients 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 maximum clamping voltage (VC) at 27.8 A peak pulse current (IPPM), and 400 W peak pulse power (10/1000 μs waveform), used to protect MOSFETs, ICs, and sensor interfaces in automotive and industrial control systems.
For engineers reviewing the SMAJ8.5A-E3/61 datasheet, SMAJ8.5A-E3/61 pinout, SMAJ8.5A-E3/61 application, or SMAJ8.5A-E3/61 equivalent, key selection criteria include clamping voltage margin relative to protected device's absolute maximum rating, thermal resistance (RθJA = 120 °C/W), unidirectional polarity marking, RoHS-compliant matte tin plating, and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
This TVS diode operates as a fast-acting shunt clamp during overvoltage events, leveraging an avalanche breakdown mechanism to divert surge current away from downstream circuitry. Its glass-passivated junction ensures stable VBR tolerance and low leakage (<10 μA at VWM), while the SMA package supports high surge current handling (IFSM = 40 A, 8.3 ms half-sine) without thermal runaway under repetitive transient conditions.
The device is rated for -55 °C to +150 °C operating junction temperature, meets MSL Level 1 per J-STD-020 (peak reflow 260 °C), and exhibits a positive temperature coefficient of VBR (+0.073 %/°C), enabling predictable voltage shift across temperature extremes in automotive under-hood applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.5 V - Maximum continuous reverse operating voltage before clamping begins; must exceed normal line voltage to avoid leakage-induced power loss. |
| VBR min/max | 9.44 V / 10.4 V at IT = 1 mA - Confirmed breakdown range ensures reliable triggering within 15 % tolerance of nominal rating. |
| VC @ IPPM | 14.4 V at 27.8 A - Clamping voltage defines worst-case stress on protected IC; stays below 16 V, safe for 12 V rail logic interfaces. |
| PPPM | 400 W (10/1000 μs) - Peak surge energy handling capacity; derates to 300 W above 78 V, but SMAJ8.5A-E3/61 fully utilizes full 400 W rating. |
| ID @ VWM | <10 μA - Low reverse leakage preserves battery life in always-on sensor nodes and avoids false triggering in high-impedance circuits. |
| RθJA | 120 °C/W - Thermal resistance determines self-heating rise under sustained power dissipation; requires minimum 0.2" × 0.2" copper pad per terminal. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, molded plastic case with matte tin-plated leads. Cathode indicated by band; anode is unmarked end. Meets UL 94 V-0 flammability rating and JESD 22-B102 solderability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Surge current sink node | Connected to protected line; conducts avalanche current to ground during overvoltage event; polarity critical for unidirectional operation. |
| Anode (unbanded end) | Reference/ground return path | Typically tied to system ground or low-impedance return plane; completes clamping loop; must maintain low-inductance connection for effective transient suppression. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Enables robust protection against IEC 61000-4-5 Level 4 surges (4 kV/2 Ω) on 12 V automotive power rails without derating. |
| Glass passivated junction | Ensures long-term stability of VBR and low parametric drift over 1000+ thermal cycles in harsh environments. |
| MSL Level 1 moisture sensitivity | Allows direct use from reel without baking; compatible with standard SMT reflow profiles up to 260 °C peak. |
| RoHS-compliant, matte tin plating | Supports lead-free assembly and eliminates whisker risk per JESD 201 Class 2; ensures reliable solder joint integrity. |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input Protection |
|---|---|
Use Scenario: Protects microcontroller GPIOs and CAN transceiver power pins from load-dump and inductive switching transients in 12 V vehicle electrical systems. IC Role / Device Role / Timing Role: Unidirectional shunt TVS placed between 12 V supply rail and ground, triggered within <1 ps to clamp spikes up to 100 V. Use Value: Limits voltage seen by downstream LDOs and MCU I/O to ≤14.4 V, preventing latch-up and permanent damage during ISO 7637-2 Pulse 5a events. |
Use Scenario: Shields 24 V DC digital input channels from field-wiring induced surges caused by relay coil de-energization or lightning coupling. IC Role / Device Role / Timing Role: Standoff-rated TVS mounted at connector entry point, clamping transients before signal conditioning circuitry. Use Value: Maintains functional safety integrity by ensuring input stage remains operational after repeated 1 kV/42 Ω surges per IEC 61000-4-4. |
| Consumer Appliance Motor Driver Board | Telecom Power Supply EMI Filter Stage |
Use Scenario: Safeguards gate drivers and bootstrap capacitors in BLDC motor inverters from flyback voltage spikes generated by PWM-controlled inductive loads. IC Role / Device Role / Timing Role: Fast-response TVS placed across high-side FET source-to-drain, activated before internal FET avalanche limit is exceeded. Use Value: Extends MOSFET lifetime by reducing cumulative avalanche energy stress; enables use of lower-cost 30 V rated FETs on 24 V systems. |
Use Scenario: Suppresses differential-mode transients entering AC/DC power supplies via telecom-grade Ethernet or PoE injectors. IC Role / Device Role / Timing Role: Primary-stage TVS on secondary-side DC output, coordinated with Y-capacitor and common-mode choke. Use Value: Prevents upstream regulator shutdown or output overvoltage faults during EN 61000-4-5 surge testing at 1.5 kV line-to-ground. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ8.5A-M3/61 | Halogen-free, RoHS-compliant variant with identical electrical specs and SMA package; same VWM, VBR, VC, and PPPM ratings. | Required where halogen-free compliance is mandated by OEM environmental specifications (e.g., EU automotive Tier 1). | Select SMAJ8.5A-M3/61 when material declarations require halogen-free status; no layout or performance trade-offs. |
| SMAJ8.5AHE3_A/H | AEC-Q101 qualified version; same electrical parameters but validated for automotive-grade reliability (HTOL, TC, UHAST). | Approved for under-hood automotive applications requiring qualification per AEC-Q101 Rev D; not required for commercial/industrial use. | Choose SMAJ8.5AHE3_A/H only for automotive production programs needing formal qualification evidence; adds cost and lead time. |
Compared with SMAJ8.5A-M3/61 and SMAJ8.5AHE3_A/H, the SMAJ8.5A-E3/61 offers standard commercial-grade reliability at lowest cost and shortest lead time, making it optimal for non-automotive industrial and consumer designs where halogen-free or AEC-Q101 certification is not mandated.
Availability
SMAJ8.5A-E3/61 is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC input protection, consumer appliance motor drives, and telecom power supply filtering requiring stable component supply and full traceability.
Supply support for SMAJ8.5A-E3/61 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, TVS devices, and optoelectronics with emphasis on high-reliability, high-efficiency solutions.
The SMAJ series was engineered for robust transient suppression in space-constrained SMT applications, targeting automotive, industrial, and telecom markets where fast response, repeatable clamping, and AEC-Q101 readiness are critical.
FAQ
What is the maximum clamping voltage of SMAJ8.5A-E3/61 under peak surge conditions?
The SMAJ8.5A-E3/61 has a maximum clamping voltage (VC) of 14.4 V at its rated peak pulse current (IPPM) of 27.8 A, measured with a 10/1000 μs waveform. This value is guaranteed per Vishay's datasheet (Doc #88390, Rev 09-Jan-2024) and defines the upper voltage limit imposed on protected circuitry during transient events. Designers must ensure this clamping level remains safely below the absolute maximum rating of downstream components.
Does SMAJ8.5A-E3/61 meet automotive qualification standards?
The SMAJ8.5A-E3/61 is a commercial-grade part and is not AEC-Q101 qualified. However, Vishay offers the pin-compatible SMAJ8.5AHE3_A/H variant which is fully AEC-Q101 qualified for automotive applications. The SMAJ8.5A-E3/61 shares identical electrical characteristics and package dimensions with the HE3 variant, but lacks the extended reliability validation required for under-hood deployment.
What is the thermal resistance from junction to ambient for SMAJ8.5A-E3/61?
The typical thermal resistance from junction to ambient (RθJA) for SMAJ8.5A-E3/61 is 120 °C/W, measured on a standard PCB with 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. This value assumes no additional heatsinking and is critical for calculating junction temperature rise under sustained power dissipation-especially during repetitive surge events or elevated ambient conditions.
How does the polarity marking work on SMAJ8.5A-E3/61?
The SMAJ8.5A-E3/61 is a unidirectional TVS diode with cathode indicated by a visible band on the SMA (DO-214AC) package body. During normal operation, the banded end connects to the line being protected (e.g., 12 V rail), while the unbanded (anode) end connects to ground. Reversing polarity prevents proper clamping and may cause catastrophic failure under surge conditions.
What is the reverse leakage current specification for SMAJ8.5A-E3/61 at its stand-off voltage?
At its 8.5 V stand-off voltage (VWM), the SMAJ8.5A-E3/61 exhibits a maximum reverse leakage current (ID) of 10 μA at TA = 25 °C. This low leakage ensures minimal power drain in battery-powered or always-on systems and avoids false triggering in high-impedance sensing circuits-critical for precision analog front-ends and IoT edge nodes.
SMAJ8.5A-E3/61 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):
- 27.8A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ8.5A-E3/61 FAQ
1.How can I place an order for SMAJ8.5A-E3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ8.5A-E3/61 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 SMAJ8.5A-E3/61 reliable?
The price and inventory of SMAJ8.5A-E3/61 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ8.5A-E3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ8.5A-E3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ8.5A-E3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ8.5A-E3/61?
SMAJ8.5A-E3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ8.5A-E3/61 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 SMAJ8.5A-E3/61?
For technical support, including SMAJ8.5A-E3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ8.5A-E3/61 requirements.
6.How does Aetrix verify that SMAJ8.5A-E3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ8.5A-E3/61 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 SMAJ8.5A-E3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ8.5A-E3/61?
All SMAJ8.5A-E3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ8.5A-E3/61, 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 SMAJ8.5A-E3/61 part is unused and in its original packaging.
Return procedure for SMAJ8.5A-E3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ8.5A-E3/61 Tags
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