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Vishay General Semiconductor - Diodes Division SMAJ8.0AHE3_A/I
- Part No.:
- SMAJ8.0AHE3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ8.0AHE3_A/I.pdf
- Description:
- TVS DIODE 8VWM 13.6VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,451
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Product details
Overview
SMAJ8.0AHE3_A/I 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 8.0 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 control systems.
For engineers reviewing the SMAJ8.0AHE3_A/I datasheet, SMAJ8.0AHE3_A/I pinout, SMAJ8.0AHE3_A/I application, or SMAJ8.0AHE3_A/I equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification status, 150 °C max junction temperature, low incremental surge resistance, and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
This TVS diode operates as a clamping device that enters avalanche conduction when reverse voltage exceeds its breakdown threshold, limiting transient energy to protected downstream circuitry. Its glass-passivated junction ensures stable leakage performance and fast response time (<1 ns), while the SMA package supports high thermal dissipation via low RθJL (30 °C/W).
The device is rated for 40 A non-repetitive forward surge current (IFSM) and exhibits a positive temperature coefficient of VBR (+0.069 %/°C), enabling predictable voltage shift over temperature. It meets MSL Level 1 per J-STD-020 and is qualified to AEC-Q101 for automotive under-hood applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.0 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC/AC signal line operating margin. |
| VBR min/max | 8.89 V / 9.83 V at IT = 1 mA - Confirmed breakdown range ensures reliable turn-on during transients without premature conduction. |
| VC @ IPPM | 13.6 V at 29.4 A - Clamped voltage level under 10/1000 μs surge; determines maximum stress imposed on protected IC or MOSFET. |
| PPPM | 400 W - Peak pulse power handling capability with standard 10/1000 μs waveform; enables protection against IEC 61000-4-5 Level 4 surges. |
| ID @ VWM | 50 μA - Reverse leakage at rated stand-off voltage; low value minimizes quiescent power loss in battery-powered systems. |
| TJ max | +150 °C - Maximum junction temperature rating; supports operation in under-hood automotive environments and industrial enclosures. |
| RθJA | 120 °C/W - Junction-to-ambient thermal resistance on standard PCB pad layout; informs derating requirements above 25 °C ambient. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, unidirectional polarity with cathode band marking. Matte tin-plated leads, RoHS-compliant and AEC-Q101 qualified (HE3 suffix). Meets UL 94 V-0 flammability rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / transient return path | Connected to ground or low-impedance return plane; forms current loop with cathode during clamping event. |
| Cathode | Transient voltage sensing and clamping node | Connected to protected line (e.g., 12 V rail or sensor output); avalanche conduction initiates here 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 units and ADAS sensors. |
| 400 W peak pulse power | Handles 10/1000 μs surges up to 29.4 A without degradation - sufficient for ISO 7637-2 Pulse 1/2a/5a and IEC 61000-4-5 combination wave tests. |
| Glass passivated junction | Ensures stable VBR and low leakage across temperature and lifetime - critical for long-term protection integrity in industrial PLCs. |
| Low profile SMA package | Enables high-density PCB layouts and compatibility with standard SMT reflow profiles (peak 260 °C, MSL Level 1). |
| 0.069 %/°C VBR tempco | Predictable, moderate positive drift allows accurate system-level clamping margin calculation across -55 °C to +150 °C operating range. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Suppressing load dump and alternator ripple transients on 12 V battery-fed ECUs and body control modules. IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed between power rail and ground, responding within <1 ns to limit voltage spikes to ≤13.6 V. Use Value: Prevents latch-up or gate oxide damage in MCU power supplies and CAN transceivers by maintaining rail integrity below 14 V during 100 V/100 ms load dump events. |
Use Scenario: Protecting analog outputs of pressure/temperature sensors connected to ADC inputs in factory automation systems. IC Role / Device Role / Timing Role: Standoff-clamp TVS on sensor signal line, conducting only during ESD or inductive switching events exceeding 8.0 V. Use Value: Maintains sub-μA leakage at 8.0 V to avoid signal offset errors while clamping 8 kV HBM ESD pulses to <13.6 V, preserving ADC accuracy. |
| Consumer USB Port Surge Protection | Telecom Line Card Transient Suppression |
|
Use Scenario: Safeguarding USB VBUS and D+/D− lines in portable chargers and docking stations against hot-plug and ESD events. IC Role / Device Role / Timing Role: Discrete unidirectional TVS on VBUS rail, leveraging fast response and low clamping to shield USB PD controllers. Use Value: Limits VBUS overshoot to 13.6 V during 15 kV air discharge ESD, preventing overvoltage shutdown of USB-C power delivery ICs. |
Use Scenario: Shielding Ethernet PHY and PoE interface circuits from lightning-induced surges on RJ45 ports in enterprise switches. IC Role / Device Role / Timing Role: Primary clamping element on DC bias lines feeding magnetics, coordinated with gas discharge tubes for staged protection. Use Value: Absorbs first 400 W of surge energy with 13.6 V clamping, reducing stress on secondary protection and enabling robust 6 kV/10/700 μs telecom surge compliance. |
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-E3/61 | Same electrical specs, RoHS-compliant commercial grade (no AEC-Q101 qualification), packaged in 7" tape/reel (1800 pcs). | Lacks automotive qualification; suitable for consumer and industrial non-automotive designs where AEC-Q101 is not mandated. | Select SMAJ8.0AHE3_A/I when automotive qualification, 13" reel volume, or traceable sourcing is required. |
| SMAJ8.0AHE3_A/H | Identical electrical and qualification specs; differs only in packaging - 7" tape/reel (1800 pcs) vs. 13" reel (7500 pcs) for SMAJ8.0AHE3_A/I. | No functional or application difference; choice depends solely on production volume and SMT line feeder compatibility. | Choose SMAJ8.0AHE3_A/H for pilot runs or smaller batch builds; SMAJ8.0AHE3_A/I for high-volume manufacturing. |
Compared with SMAJ8.0A-E3/61 and SMAJ8.0AHE3_A/H, the SMAJ8.0AHE3_A/I provides identical clamping performance and AEC-Q101 qualification but is optimized for large-scale automotive production via 13" reel packaging and full traceability - making it the preferred option for Tier 1 OEM programs requiring lifecycle continuity and audit-ready sourcing.
Availability
SMAJ8.0AHE3_A/I is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface hardening, and telecom line card surge suppression requiring stable component supply, AEC-Q101 compliance, and high-volume SMT readiness.
Supply support for SMAJ8.0AHE3_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 SMAJ series is part of Vishay's TRANSZORB® TVS platform, engineered specifically for robust transient suppression in automotive, industrial, and communications infrastructure where fast response, precise clamping, and qualification-grade consistency are mandatory.
FAQ
What is the maximum clamping voltage of the SMAJ8.0AHE3_A/I under a 10/1000 μs surge?
The SMAJ8.0AHE3_A/I has a maximum clamping voltage (VC) of 13.6 V at 29.4 A peak pulse current (IPPM) under the standardized 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and confirmed in Vishay's datasheet revision 09-Jan-2024. The clamping performance ensures protected downstream components - such as microcontrollers or CAN transceivers - remain within safe voltage limits during surge events. This VC rating directly supports design margin calculations for IEC 61000-4-5 and ISO 7637-2 compliance.
Is the SMAJ8.0AHE3_A/I AEC-Q101 qualified, and what does that qualification cover?
Yes, the SMAJ8.0AHE3_A/I is AEC-Q101 qualified, as indicated by the "HE3" suffix in its ordering code. This qualification covers stress tests including high-temperature reverse bias (HTRB), temperature cycling, mechanical shock, and ESD (HBM ≥ 8 kV). The device is validated for use in automotive powertrain, chassis, and ADAS applications where reliability under extended temperature (-55 °C to +150 °C) and vibration is critical. The qualification applies specifically to the SMAJ8.0AHE3_A/I variant - not generic SMAJ8.0A parts without HE3 suffix.
What is the polarity and marking convention for the SMAJ8.0AHE3_A/I?
The SMAJ8.0AHE3_A/I is a unidirectional TVS diode, with polarity indicated by a cathode band on the SMA (DO-214AC) package body. The banded end corresponds to the cathode terminal, which must be connected to the line being protected (e.g., 12 V rail), while the anode connects to ground. This configuration enables avalanche conduction during positive transients on the protected line. Bidirectional variants use the "CA" suffix (e.g., SMAJ8.0CA) and have no polarity marking - the SMAJ8.0AHE3_A/I is strictly unidirectional and must be oriented correctly during placement.
How does the thermal resistance of the SMAJ8.0AHE3_A/I affect its surge handling capability?
The SMAJ8.0AHE3_A/I has a typical junction-to-lead thermal resistance (RθJL) of 30 °C/W and junction-to-ambient (RθJA) of 120 °C/W when mounted on 0.2" × 0.2" copper pads. Lower RθJL enables efficient heat transfer to PCB copper during short-duration surges, preserving the 400 W PPPM rating. However, repeated surges or elevated ambient temperatures require derating per Figure 2 in the datasheet - for example, at TA = 85 °C, peak pulse power drops to ~280 W. Proper pad layout and thermal vias are essential to maintain clamping performance under sustained stress.
Can the SMAJ8.0AHE3_A/I replace SMAJ8.0A-E3/61 in an existing design?
Yes, the SMAJ8.0AHE3_A/I is a direct functional and pin-compatible replacement for SMAJ8.0A-E3/61, sharing identical electrical characteristics (VWM = 8.0 V, VC = 13.6 V, PPPM = 400 W) and SMA package dimensions. The key distinction is AEC-Q101 qualification and packaging format: SMAJ8.0AHE3_A/I is automotive-qualified and supplied in 13" reels (7500 pcs), whereas SMAJ8.0A-E3/61 is commercial-grade in 7" reels (1800 pcs). No PCB changes are required, but qualification-driven validation may be needed for automotive safety-critical applications.
SMAJ8.0AHE3_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):
- 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_A/I FAQ
1.How can I place an order for SMAJ8.0AHE3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ8.0AHE3_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 SMAJ8.0AHE3_A/I reliable?
The price and inventory of SMAJ8.0AHE3_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 SMAJ8.0AHE3_A/I is usually 5 days.
3.What payment methods are accepted for SMAJ8.0AHE3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ8.0AHE3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ8.0AHE3_A/I?
SMAJ8.0AHE3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ8.0AHE3_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 SMAJ8.0AHE3_A/I?
For technical support, including SMAJ8.0AHE3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ8.0AHE3_A/I requirements.
6.How does Aetrix verify that SMAJ8.0AHE3_A/I is sourced from the original manufacturer or authorized distributors?
All SMAJ8.0AHE3_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 SMAJ8.0AHE3_A/I meets industry standards.
7.What is the process for return or replacement of SMAJ8.0AHE3_A/I?
All SMAJ8.0AHE3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ8.0AHE3_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 SMAJ8.0AHE3_A/I part is unused and in its original packaging.
Return procedure for SMAJ8.0AHE3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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