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Vishay General Semiconductor - Diodes Division SMAJ8.0AHE3/5A
- Part No.:
- SMAJ8.0AHE3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ8.0AHE3/5A.pdf
- Description:
- TVS DIODE 8VWM 13.6VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,290
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Product details
Overview
SMAJ8.0AHE3/5A from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping transient overvoltages on power and signal lines. It features 8.0 V stand-off voltage (VWM), 8.89–9.83 V breakdown voltage (VBR) at 1 mA test current, 13.6 V maximum clamping voltage (VC) at 29.4 A peak pulse current (IPPM), and 400 W peak pulse power rating with 10/1000 μs waveform - used to protect MOSFETs, ICs, and sensor interfaces in automotive and industrial electronics.
For engineers reviewing the SMAJ8.0AHE3/5A datasheet, SMAJ8.0AHE3/5A pinout, SMAJ8.0AHE3/5A application, or SMAJ8.0AHE3/5A equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification, 120 °C/W junction-to-ambient thermal resistance, low leakage (<50 μA at VWM), and compatibility with automated SMT assembly on standard PCB pad layouts.
Technical Context
This TVS diode operates as a fast-acting shunt clamp during voltage transients, leveraging an avalanche breakdown mechanism to divert surge energy away from downstream circuitry. Its glass-passivated junction ensures stable VBR tolerance and long-term reliability under repetitive surge stress.
The device is rated for -55 °C to +150 °C operating junction temperature, supports 40 A non-repetitive forward surge current (IFSM), and exhibits 0.069 %/°C temperature coefficient of VBR - enabling predictable clamping behavior across automotive thermal environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.0 V - maximum continuous reverse operating voltage before clamping begins; defines safe DC/AC working margin for protected line. |
| VBR min/max | 8.89 V / 9.83 V at IT = 1 mA - verified avalanche breakdown range ensuring consistent turn-on threshold across production lots. |
| VC @ IPPM | 13.6 V at 29.4 A - clamping voltage under standardized 10/1000 μs surge; determines maximum stress imposed on downstream ICs. |
| PPPM | 400 W - peak pulse power handling capability with 10/1000 μs waveform; defines single-event surge robustness per JEDEC standards. |
| ID @ VWM | <50 μA - reverse leakage current at rated stand-off voltage; critical for low-power sensor and battery-backed circuits. |
| TJ max. | +150 °C - maximum junction temperature; enables operation in under-hood automotive and high-ambient industrial environments. |
| RθJA | 120 °C/W - thermal resistance junction-to-ambient on standard 0.2" × 0.2" copper pads; informs derating requirements for sustained power dissipation. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, molded plastic case with matte tin-plated leads; meets UL 94 V-0 flammability rating and J-STD-020 MSL Level 1 (peak reflow 260 °C). Polarity indicated by cathode band; unidirectional configuration only.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection point | Connected to ground or lower-potential rail; completes clamping path during positive transients on cathode side. |
| Cathode | High-side connection point | Connected to protected line (e.g., 12 V supply or signal trace); conducts avalanche current when voltage exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and surge endurance - suitable for engine control, ADAS, and body electronics. |
| 400 W peak pulse power | Handles IEC 61000-4-5 Level 4 surges (4 kV/2 Ω) without degradation when mounted per recommended pad layout. |
| Fast response time <1 ps | Clamps transients before sensitive logic or analog circuitry experiences overvoltage damage - critical for high-speed data lines and microcontroller I/O protection. |
| Glass passivated junction | Ensures stable VBR drift <±5 % over lifetime and immunity to humidity-induced parameter shift in harsh environments. |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard reflow without baking - simplifies manufacturing and reduces process risk. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 12 V power distribution networks in vehicle ECUs from load-dump and inductive switching transients. IC Role / Device Role / Timing Role: Unidirectional shunt clamp placed between battery rail and regulator input to limit voltage excursions to ≤13.6 V. Use Value: Prevents regulator latch-up and MOSFET gate oxide failure during ISO 7637-2 Pulse 5a events up to 35 V/100 ms. |
Use Scenario: Safeguarding analog output lines of pressure/temperature sensors in factory automation PLC modules. IC Role / Device Role / Timing Role: Low-leakage TVS connected across 4–20 mA loop terminals to suppress ESD and field-wiring induced spikes. Use Value: Maintains signal integrity with <50 μA leakage at 8.0 V, avoiding offset errors in precision current-loop receivers. |
| Consumer USB Port ESD Protection | Telecom Line Card Surge Suppression |
|
Use Scenario: Secondary-level ESD protection on VBUS line of USB Type-A ports in set-top boxes and smart displays. IC Role / Device Role / Timing Role: Stand-off clamping device placed upstream of USB switch IC to absorb ±15 kV contact discharge per IEC 61000-4-2. Use Value: Clamps to 13.6 V within picoseconds, limiting stress on internal USB PHY and preventing system reset or port lockup. |
Use Scenario: Primary surge protection on Ethernet PHY power rails (3.3 V or 5 V) in telecom access equipment exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Fast-acting unidirectional clamp on PHY supply pins to divert 10/1000 μs transients from IEEE C62.41 Category B/C sources. Use Value: Withstands 400 W pulses without parametric shift, preserving PHY functionality after repeated surge events in outdoor cabinets. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ8.0A-E3/5A | Same electrical specs and package, but commercial-grade (non-AEC-Q101); RoHS-compliant with matte tin plating. | Lacks automotive qualification; suitable for consumer and industrial applications where AEC-Q101 is not mandated. | Select when cost sensitivity outweighs automotive reliability requirements and no extended temperature validation is needed. |
| SMBJ8.0AHE3/5A | Higher 600 W PPPM rating, SMB (DO-214AA) package with larger thermal mass; identical VWM/VBR/VC specs. | Better thermal performance and surge margin; requires larger PCB footprint and different pad layout. | Choose when system-level surge testing exceeds 400 W or when board space allows larger package for improved long-term reliability. |
Compared with SMAJ8.0A-E3/5A, the SMAJ8.0AHE3/5A adds AEC-Q101 qualification for automotive use; compared with SMBJ8.0AHE3/5A, it trades 200 W pulse power headroom for 30 % smaller PCB area and compatible placement with existing SMA footprints.
Availability
SMAJ8.0AHE3/5A is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor systems, and consumer power interface designs requiring stable component supply, AEC-Q101 compliance, and surface-mount manufacturability.
Supply support for SMAJ8.0AHE3/5A 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, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMAJ series is engineered for robust transient suppression in space-constrained, high-reliability applications - particularly targeting automotive power systems, industrial controls, and communication infrastructure where fast clamping and thermal stability are essential.
FAQ
What is the clamping voltage of SMAJ8.0AHE3/5A at its rated peak pulse current?
The SMAJ8.0AHE3/5A has a maximum clamping voltage (VC) of 13.6 V at 29.4 A peak pulse current (IPPM), measured under the standardized 10/1000 μs waveform. This value defines the upper voltage limit imposed on protected circuitry during surge events and is confirmed across production lots per Vishay's datasheet revision 09-Jan-2024. The SMAJ8.0AHE3/5A maintains this clamping performance with minimal variation due to its tightly controlled avalanche junction.
Is SMAJ8.0AHE3/5A suitable for automotive applications?
Yes, SMAJ8.0AHE3/5A is AEC-Q101 qualified, as indicated by the "HE3" suffix, making it suitable for automotive applications including engine control units, body electronics, and ADAS subsystems. It undergoes rigorous stress testing for temperature cycling, high-temperature reverse bias, and surge endurance. The SMAJ8.0AHE3/5A operates reliably from -55 °C to +150 °C junction temperature and meets MSL Level 1 for lead-free reflow compatibility - fulfilling key automotive manufacturing and field reliability requirements.
What is the difference between SMAJ8.0AHE3/5A and SMAJ8.0A-E3/5A?
The SMAJ8.0AHE3/5A and SMAJ8.0A-E3/5A share identical electrical specifications (VWM = 8.0 V, VBR = 8.89–9.83 V, VC = 13.6 V) and SMA (DO-214AC) package, but differ in qualification: SMAJ8.0AHE3/5A is AEC-Q101 qualified for automotive use, while SMAJ8.0A-E3/5A is commercial-grade only. Both are RoHS-compliant with matte tin plating, but only the HE3 version carries automotive reliability validation. The SMAJ8.0AHE3/5A is the appropriate choice when automotive qualification is mandatory.
What is the maximum reverse leakage current for SMAJ8.0AHE3/5A at its stand-off voltage?
The SMAJ8.0AHE3/5A exhibits a maximum reverse leakage current (ID) of 50 μA at its 8.0 V stand-off voltage (VWM), measured at TA = 25 °C. This low leakage ensures minimal impact on battery-powered or high-impedance sensor circuits. The value is guaranteed per Vishay's electrical characteristics table and remains stable over time due to the device's glass-passivated junction - a key factor in maintaining accuracy in precision analog front-ends protected by the SMAJ8.0AHE3/5A.
Does SMAJ8.0AHE3/5A have polarity marking, and how is it oriented on the PCB?
Yes, SMAJ8.0AHE3/5A is unidirectional and features a visible cathode band on the package body, aligned with the cathode terminal. During PCB layout, the banded end must connect to the line being protected (e.g., 12 V rail), while the anode connects to ground or the return path. This orientation ensures proper avalanche conduction during positive transients. The SMAJ8.0AHE3/5A's polarity marking is consistent with DO-214AC mechanical drawings and verified in Vishay's package outline documentation.
SMAJ8.0AHE3/5A 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):
- 8V
- Voltage - Breakdown (Min):
- 8.89V
- Voltage - Clamping (Max) @ Ipp:
- 13.6V
- Current - Peak Pulse (10/1000µs):
- 29.4A
- 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)
SMAJ8.0AHE3/5A FAQ
1.How can I place an order for SMAJ8.0AHE3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ8.0AHE3/5A 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 SMAJ8.0AHE3/5A reliable?
The price and inventory of SMAJ8.0AHE3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ8.0AHE3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ8.0AHE3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ8.0AHE3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ8.0AHE3/5A?
SMAJ8.0AHE3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ8.0AHE3/5A 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 SMAJ8.0AHE3/5A?
For technical support, including SMAJ8.0AHE3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ8.0AHE3/5A requirements.
6.How does Aetrix verify that SMAJ8.0AHE3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ8.0AHE3/5A 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 SMAJ8.0AHE3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ8.0AHE3/5A?
All SMAJ8.0AHE3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ8.0AHE3/5A, 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 SMAJ8.0AHE3/5A part is unused and in its original packaging.
Return procedure for SMAJ8.0AHE3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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