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Vishay General Semiconductor - Diodes Division SMAJ22AHE3/61
- Part No.:
- SMAJ22AHE3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ22AHE3/61.pdf
- Description:
- TVS DIODE 22VWM 35.5VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,346
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Product details
Overview
SMAJ22AHE3/61 from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for robust overvoltage protection of sensitive electronics. It features a 22 V standoff voltage (VWM), 24.4–26.9 V breakdown voltage (VBR) at 1 mA, 35.5 V clamping voltage (VC) at 11.3 A peak pulse current, and 400 W peak pulse power (10/1000 μs waveform). It is widely deployed to protect MOSFETs, ICs, and sensor signal lines in automotive ECUs and industrial control interfaces.
For engineers reviewing the SMAJ22AHE3/61 datasheet, SMAJ22AHE3/61 pinout, SMAJ22AHE3/61 application, or SMAJ22AHE3/61 equivalent, key selection criteria include its AEC-Q101 qualification, low clamping ratio (VC/VBR ≈ 1.42), 1.0 μA max reverse leakage at VWM, and compatibility with automated SMT placement on standard PCB copper pads (0.2" × 0.2").
Technical Context
This TVS diode operates as a unidirectional clamping device: under normal bias it presents high impedance (<1.0 μA leakage at 22 V), but triggers into low-impedance conduction when transient voltage exceeds its 24.4–26.9 V breakdown range. Its glass-passivated junction ensures stable avalanche characteristics and fast response time (<1 ns), enabling effective suppression of ESD, inductive switching spikes, and lightning-induced surges.
The SMAJ22AHE3/61 is rated for 400 W peak pulse power (derated to 300 W above 78 V), supports 40 A non-repetitive forward surge current (8.3 ms half-sine), and maintains operation across –55 °C to +150 °C junction temperature. Its thermal resistance (RθJA = 120 °C/W) assumes mounting on 0.2" × 0.2" copper pads - critical for sustained power dissipation in compact automotive and industrial layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 22 V - Maximum continuous reverse operating voltage before significant leakage; defines safe working margin for 24 V nominal systems. |
| VBR (min/max) | 24.4 V / 26.9 V at 1 mA - Confirmed avalanche onset range; ensures reliable triggering without premature conduction. |
| VC @ IPPM | 35.5 V at 11.3 A - Clamped voltage during 10/1000 μs surge; limits downstream stress to ≤35.5 V under 400 W transient. |
| IPPM | 11.3 A - Peak surge current capability under standardized 10/1000 μs waveform; validates protection level per IEC 61000-4-5. |
| PPPM | 400 W - Peak pulse power rating; enables robust handling of repetitive transients in automotive load-dump scenarios. |
| TJ max | +150 °C - Maximum junction temperature; supports under-hood deployment in AEC-Q101 qualified automotive modules. |
| RθJA | 120 °C/W - Thermal resistance junction-to-ambient; requires minimum 0.2" × 0.2" copper pad area for thermal management. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002. Cathode indicated by band marking; polarity-critical for unidirectional operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection point | Connected to ground or low-impedance return path; completes clamping loop during transient events. |
| Cathode | High-side connection point | Connected to protected line (e.g., 24 V rail or signal input); blocks reverse current until VBR exceeded. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - required for engine control, ADAS, and body electronics. |
| 400 W peak pulse power (10/1000 μs) | Withstands high-energy transients common in 24 V vehicle electrical systems, including ISO 7637-2 Pulse 1/2a/5a. |
| Clamping voltage ≤35.5 V | Ensures protected ICs (e.g., CAN transceivers, microcontrollers) remain below absolute maximum ratings during surge events. |
| MSL Level 1 (260 °C peak reflow) | Compatible with standard lead-free SMT reflow profiles without moisture-related delamination risk. |
| Glass-passivated junction | Provides stable, repeatable avalanche characteristics and long-term parameter consistency across temperature and life cycles. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
|
Use Scenario: Protecting 24 V supply inputs in engine control units (ECUs) against load dump and alternator transients. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between battery rail and DC/DC converter input. Use Value: Limits voltage excursion to ≤35.5 V during 400 W surges, preventing damage to downstream PMICs and microcontrollers. |
Use Scenario: Shielding analog output lines (e.g., 4–20 mA current loops) in factory-floor pressure/temperature sensors. IC Role / Device Role / Timing Role: Low-capacitance TVS connected between signal line and ground, adjacent to connector interface. Use Value: Suppresses ESD and cable-coupled noise without distorting low-bandwidth analog signals due to minimal leakage (<1.0 μA). |
| Consumer Power Adapter Input Stage | Telecom Equipment DC Input Protection |
|
Use Scenario: Safeguarding AC/DC adapter primary-side rectifier outputs from mains-borne surges and switching noise. IC Role / Device Role / Timing Role: Unidirectional TVS mounted across bulk capacitor input, cathode to positive rail. Use Value: Absorbs 10/1000 μs transients up to 400 W while maintaining <1.0 μA leakage at 22 V standby, minimizing no-load power loss. |
Use Scenario: Securing -48 V DC feeding circuits in telecom base station power distribution boards. IC Role / Device Role / Timing Role: Reverse-polarity TVS (cathode to ground) protecting hot-swap controllers and supervisory ICs. Use Value: Withstands repeated 10/1000 μs surges per GR-1089-CORE while operating reliably from –55 °C to +150 °C ambient. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ22A-E3/61 | Commercial-grade (non-AEC-Q101), identical electrical specs and SMA package. | Lacks automotive qualification; suitable for industrial/commercial designs where AEC-Q101 is not mandated. | Select SMAJ22AHE3/61 when automotive qualification, extended temperature validation, or long-term supply assurance are required. |
| SMBJ22AHE3/61 | Same AEC-Q101 qualification and VWM/VBR/VC, but SMB (DO-214AA) package - 2.5 mm wider, higher PPPM (600 W). | Higher power handling enables use in higher-energy surge environments (e.g., heavy-duty vehicle alternators). | Choose SMBJ22AHE3/61 only if board layout allows larger footprint and 600 W surge margin is needed; otherwise SMAJ22AHE3/61 offers optimal space/power balance. |
Compared with SMAJ22A-E3/61, the SMAJ22AHE3/61 adds AEC-Q101 validation for automotive use without electrical trade-offs; versus SMBJ22AHE3/61, it trades 200 W peak power for 30 % smaller PCB area - making it ideal for space-constrained ECU modules requiring certified reliability.
Availability
SMAJ22AHE3/61 is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor interfaces, and telecom DC power distribution systems requiring stable component supply and long-term lifecycle support.
Supply support for SMAJ22AHE3/61 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, MOSFETs, optoelectronics, and passive components with emphasis on reliability, efficiency, and application-specific optimization.
The SMAJ series is engineered for high-reliability transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where consistent clamping performance and AEC-Q101 compliance are mandatory.
FAQ
What is the clamping voltage of SMAJ22AHE3/61 and how is it verified?
The SMAJ22AHE3/61 has a maximum clamping voltage (VC) of 35.5 V at 11.3 A peak pulse current (10/1000 μs waveform), measured per ANSI/IEEE C62.35 standards. This value is confirmed in Vishay's official datasheet (Document Number: 88390, Rev. 09-Jan-2024) and validated under standardized surge conditions with 0.2" × 0.2" copper pad mounting. The SMAJ22AHE3/61 maintains this clamping performance across its full operating temperature range (–55 °C to +150 °C).
Is SMAJ22AHE3/61 suitable for automotive applications?
Yes, SMAJ22AHE3/61 is AEC-Q101 qualified - explicitly listed in Vishay's ordering information with "HE3" suffix denoting RoHS-compliant and AEC-Q101 qualified grade. It meets automotive requirements for temperature cycling, humidity testing, and surge robustness, and is deployed in engine control units, body control modules, and ADAS power supplies. The SMAJ22AHE3/61 is rated for junction temperatures up to +150 °C and supports ISO 7637-2 compliant transient suppression.
What is the difference between SMAJ22AHE3/61 and SMAJ22A-E3/61?
The SMAJ22AHE3/61 and SMAJ22A-E3/61 share identical electrical parameters (VWM = 22 V, VBR = 24.4–26.9 V, VC = 35.5 V) and SMA (DO-214AC) package, but differ in qualification: SMAJ22AHE3/61 is AEC-Q101 qualified and intended for automotive use, while SMAJ22A-E3/61 is commercial-grade only. Both are RoHS-compliant, but only the HE3 variant undergoes extended reliability testing per automotive standards. For non-automotive designs, SMAJ22A-E3/61 is a cost-optimized alternative to SMAJ22AHE3/61.
What PCB layout guidance applies to SMAJ22AHE3/61 for optimal thermal performance?
To ensure reliable operation at rated 400 W peak pulse power, SMAJ22AHE3/61 must be mounted on minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal, as specified in Vishay's datasheet Figure 2 and Thermal Characteristics table. Smaller pads increase junction temperature and reduce surge endurance. Trace width should match pad size, and thermal vias under pads are recommended for high-reliability automotive or industrial applications. The SMAJ22AHE3/61 thermal resistance (RθJA = 120 °C/W) is defined under these exact conditions.
Does SMAJ22AHE3/61 have polarity markings, and how is it oriented in circuit?
Yes, SMAJ22AHE3/61 is unidirectional and marked with a cathode band on the SMA (DO-214AC) package body. During installation, the banded end connects to the protected line (e.g., 24 V rail or signal input), while the anode connects to ground or return path. This orientation ensures reverse-biased blocking during normal operation and forward conduction into clamping mode during overvoltage events. Incorrect polarity renders the SMAJ22AHE3/61 ineffective for transient suppression.
SMAJ22AHE3/61 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 22V
- Voltage - Breakdown (Min):
- 24.4V
- Voltage - Clamping (Max) @ Ipp:
- 35.5V
- Current - Peak Pulse (10/1000µs):
- 11.3A
- 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)
SMAJ22AHE3/61 FAQ
1.How can I place an order for SMAJ22AHE3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ22AHE3/61 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 SMAJ22AHE3/61 reliable?
The price and inventory of SMAJ22AHE3/61 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ22AHE3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ22AHE3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ22AHE3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ22AHE3/61?
SMAJ22AHE3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ22AHE3/61 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 SMAJ22AHE3/61?
For technical support, including SMAJ22AHE3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ22AHE3/61 requirements.
6.How does Aetrix verify that SMAJ22AHE3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ22AHE3/61 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 SMAJ22AHE3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ22AHE3/61?
All SMAJ22AHE3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ22AHE3/61, 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 SMAJ22AHE3/61 part is unused and in its original packaging.
Return procedure for SMAJ22AHE3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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