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Vishay General Semiconductor - Diodes Division SMAJ20AHE3_A/H
- Part No.:
- SMAJ20AHE3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ20AHE3_A/H.pdf
- Description:
- TVS DIODE 20VWM 32.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:8,652
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Product details
Overview
SMAJ20AHE3_A/H from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping fast voltage transients on power and signal lines. It features a 20 V stand-off voltage (VWM), 22.2–24.5 V breakdown voltage (VBR) at 1 mA, 32.4 V maximum clamping voltage (VC) at 12.3 A peak pulse current, and 400 W peak pulse power rating with 10/1000 μs waveform - ideal for protecting MOSFETs and ICs in automotive and industrial power rails.
For engineers reviewing the SMAJ20AHE3_A/H datasheet, SMAJ20AHE3_A/H pinout, SMAJ20AHE3_A/H application, or SMAJ20AHE3_A/H equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification, 150 °C max junction temperature, low incremental surge resistance, and compatibility with automated SMT assembly on standard 0.2" × 0.2" copper pads.
Technical Context
This TVS diode operates as a voltage-clamping protection device in series with sensitive downstream components. Its glass-passivated junction enables sub-nanosecond response to ESD and lightning-induced surges, while its low dynamic impedance ensures stable clamping under repetitive 0.01% duty-cycle transients.
The SMAJ20AHE3_A/H is rated for 40 A non-repetitive forward surge current (IFSM) and exhibits a typical thermal resistance of 120 °C/W (junction-to-ambient) when mounted per recommended pad layout. Its 0.094 %/°C temperature coefficient of VBR supports predictable performance across -55 °C to +150 °C operating range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 20 V - Maximum continuous reverse working voltage before significant leakage; defines safe operating margin below clamping threshold |
| VBR (Breakdown Voltage) | 22.2–24.5 V at 1 mA - Voltage at which device transitions from high-impedance to low-impedance clamping state |
| VC (Clamping Voltage) | 32.4 V at 12.3 A (10/1000 μs) - Peak voltage seen by protected circuit during worst-case surge; determines minimum withstand rating required |
| PPPM (Peak Pulse Power) | 400 W - Maximum transient energy absorption capability without failure; derates to 300 W above 78 V |
| IPPM (Peak Pulse Current) | 12.3 A - Surge current level at which VC is specified; correlates directly with system-level surge test compliance (e.g., ISO 7637-2 Pulse 1/2a) |
| TJmax | +150 °C - Maximum junction temperature; enables operation in under-hood automotive environments and high-ambient industrial settings |
| Package | SMA (DO-214AC) - Standardized surface-mount outline with cathode band marking; compatible with J-STD-020 MSL Level 1 reflow profile (260 °C peak) |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads, polarity indicated by cathode band on unidirectional devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point | Connected to lower-potential side of protected line (e.g., GND or return path); forms low-impedance shunt path during overvoltage |
| Cathode | Reverse-biased terminal | Connected to higher-potential side (e.g., VIN, signal line); reverse breakdown initiates clamping action when VIN exceeds 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, body electronics, and ADAS power rails |
| 400 W peak pulse power (10/1000 μs) | Withstands ISO 7637-2 Pulse 1 (inductive load dump) and IEC 61000-4-5 surge events without degradation when properly heatsinked |
| Low clamping ratio (VC/VBR ≈ 1.38) | Minimizes overvoltage stress on protected ICs - e.g., keeps 3.3 V or 5 V logic inputs within safe absolute maximum ratings during transients |
| MSL Level 1 moisture sensitivity | Enables standard SMT reflow without baking; eliminates production delays and moisture-related delamination risk |
| Glass passivated junction | Ensures stable leakage current (<1 μA at VWM) and long-term parameter stability under thermal and humidity stress |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 12 V supply lines feeding engine control units (ECUs) against load dump and alternator transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and DC-DC input, clamping spikes within 1 ns to limit voltage to ≤32.4 V. Use Value: Prevents damage to automotive-grade microcontrollers and CAN transceivers during ISO 7637-2 Pulse 5a (load dump up to 60 V/100 ms). |
Use Scenario: Shielding analog sensor outputs (e.g., pressure, temperature) in factory automation systems from ESD and cable discharge events. IC Role / Device Role / Timing Role: TVS installed at connector interface, shunting transients before they reach precision ADC front-end or op-amp buffers. Use Value: Maintains signal integrity by limiting transient-induced offset shift and preventing latch-up in 24 V industrial I/O modules. |
| Consumer Power Adapter Input Stage | Telecom Line Card Surge Suppression |
|
Use Scenario: Safeguarding AC-DC adapter primary-side rectifier and controller ICs from line surges and switching noise. IC Role / Device Role / Timing Role: Mounted across bulk capacitor input, clamping fast-rising transients induced by nearby relay switching or lightning coupling. Use Value: Extends adapter lifetime by absorbing 400 W surges without degradation, meeting UL 1449 Type 4 component requirements. |
Use Scenario: Protecting Ethernet PHY and PoE controller ICs on telecom line cards from induced surges on RJ45 ports. IC Role / Device Role / Timing Role: Paired with common-mode chokes and gas discharge tubes to form multi-stage protection network on differential pairs. Use Value: Enables compliance with GR-1089-CORE Level 4 (2 kV ring wave) while maintaining <1 pF junction capacitance to avoid signal distortion. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ20A-E3/61 | Same electrical specs and SMA package; RoHS-compliant commercial grade (non-AEC-Q101 qualified) | Lacks automotive qualification; not validated for temperature cycling or HTRB per AEC-Q101 | Select when cost-sensitive industrial or consumer designs do not require automotive reliability evidence |
| SMAJ20AHM3_A/H | Identical AEC-Q101 qualification and electrical parameters; halogen-free molding compound | Meets stricter environmental mandates (e.g., EU RoHS + halogen-free) without performance trade-offs | Choose for automotive Tier 1 suppliers requiring full material compliance documentation and green manufacturing alignment |
Compared with SMAJ20AHE3_A/H, SMAJ20A-E3/61 offers identical clamping and power handling but lacks automotive qualification evidence, while SMAJ20AHM3_A/H adds halogen-free compliance without altering electrical behavior - enabling direct substitution where material content requirements differ.
Availability
SMAJ20AHE3_A/H is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor interfaces, consumer power adapters, and telecom line cards requiring stable component supply with AEC-Q101 validation and traceable sourcing.
Supply support for SMAJ20AHE3_A/H 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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and application-specific performance.
The SMAJ series is engineered for robust transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where high-energy surge immunity and long-term parametric stability are critical.
FAQ
What is the maximum clamping voltage of the SMAJ20AHE3_A/H under a 10/1000 μs surge?
The SMAJ20AHE3_A/H has a maximum clamping voltage (VC) of 32.4 V at 12.3 A peak pulse current with a 10/1000 μs waveform. This value is measured per JEDEC standards and defines the upper voltage limit imposed on protected circuitry during standardized surge events. The SMAJ20AHE3_A/H maintains this clamping performance across its full operating temperature range (-55 °C to +150 °C) when mounted per Vishay's recommended pad layout.
Is SMAJ20AHE3_A/H qualified for automotive applications?
Yes, SMAJ20AHE3_A/H is AEC-Q101 qualified, meaning it has passed rigorous stress tests including high-temperature reverse bias (HTRB), temperature cycling, and ESD verification per automotive reliability standards. This qualification confirms suitability for under-hood and cabin applications such as engine control modules, body control units, and ADAS power supplies - unlike commercial-grade variants like SMAJ20A-E3/61.
What is the polarity configuration of SMAJ20AHE3_A/H?
SMAJ20AHE3_A/H is a unidirectional TVS diode, with polarity marked by a cathode band on the SMA (DO-214AC) package. The cathode must be connected to the higher-potential side of the protected line (e.g., VBAT or signal input), while the anode connects to ground or return. This configuration ensures reverse-biased operation during normal conditions and rapid avalanche breakdown during overvoltage events.
How does the thermal resistance of SMAJ20AHE3_A/H affect PCB layout?
SMAJ20AHE3_A/H has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on 0.2" × 0.2" copper pads per Vishay's recommended layout. To maintain TJ ≤ 150 °C during repetitive surges, designers must ensure adequate copper area and minimize trace length to reduce thermal impedance. Using larger pads or internal ground planes lowers effective RθJA, directly improving surge endurance and long-term reliability of the SMAJ20AHE3_A/H.
Can SMAJ20AHE3_A/H replace SMAJ20A-E3/61 in existing designs?
SMAJ20AHE3_A/H is a drop-in replacement for SMAJ20A-E3/61 in terms of footprint, pinout, and electrical specifications - both use the SMA (DO-214AC) package and share identical VWM, VBR, VC, and PPPM. However, SMAJ20AHE3_A/H adds AEC-Q101 qualification and RoHS compliance, making it suitable for automotive production where the commercial-grade SMAJ20A-E3/61 would not meet qualification requirements. No PCB changes are needed for migration.
SMAJ20AHE3_A/H 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):
- 20V
- Voltage - Breakdown (Min):
- 22.2V
- Voltage - Clamping (Max) @ Ipp:
- 32.4V
- Current - Peak Pulse (10/1000µs):
- 12.3A
- 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)
SMAJ20AHE3_A/H FAQ
1.How can I place an order for SMAJ20AHE3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ20AHE3_A/H 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 SMAJ20AHE3_A/H reliable?
The price and inventory of SMAJ20AHE3_A/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ20AHE3_A/H is usually 5 days.
3.What payment methods are accepted for SMAJ20AHE3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ20AHE3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ20AHE3_A/H?
SMAJ20AHE3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ20AHE3_A/H 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 SMAJ20AHE3_A/H?
For technical support, including SMAJ20AHE3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ20AHE3_A/H requirements.
6.How does Aetrix verify that SMAJ20AHE3_A/H is sourced from the original manufacturer or authorized distributors?
All SMAJ20AHE3_A/H 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 SMAJ20AHE3_A/H meets industry standards.
7.What is the process for return or replacement of SMAJ20AHE3_A/H?
All SMAJ20AHE3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ20AHE3_A/H, 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 SMAJ20AHE3_A/H part is unused and in its original packaging.
Return procedure for SMAJ20AHE3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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