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Vishay General Semiconductor - Diodes Division SMAJ28AHE3/61
- Part No.:
- SMAJ28AHE3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ28AHE3/61.pdf
- Description:
- TVS DIODE 28VWM 45.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:3,342
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Product details
Overview
SMAJ28AHE3/61 from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode designed for robust overvoltage protection of sensitive electronics. It features a 28 V standoff voltage (VWM), 31.1–34.4 V breakdown voltage (VBR) at 1 mA, 45.4 V maximum clamping voltage (VC) at 8.8 A peak pulse current, and 400 W peak pulse power rating (10/1000 μs waveform). It is widely deployed in automotive power line and sensor interface protection.
For engineers reviewing the SMAJ28AHE3/61 datasheet, SMAJ28AHE3/61 pinout, SMAJ28AHE3/61 application, or SMAJ28AHE3/61 equivalent, key selection criteria include clamping performance under 8.8 A surge, unidirectional polarity with cathode band marking, AEC-Q101 qualification for automotive use, and SMA (DO-214AC) surface-mount compatibility with automated assembly.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: under normal conditions it presents high impedance (>1 μA leakage at 28 V), but triggers into low-impedance conduction when transient voltage exceeds its breakdown threshold. Its glass-passivated junction ensures stable VBR tolerance and fast response (<1 ns), while the low incremental surge resistance enables effective energy diversion without excessive voltage overshoot.
The device is rated for 150 °C maximum junction temperature and derates linearly above 25 °C ambient, with thermal resistance of 120 °C/W (junction-to-ambient) on standard 0.2" × 0.2" copper pads. It meets MSL Level 1 per J-STD-020 and supports lead-free reflow up to 260 °C peak.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - Maximum continuous reverse operating voltage before significant leakage begins; defines safe working range for protected circuitry. |
| VBR (min/max) | 31.1 V / 34.4 V at 1 mA - Confirmed breakdown window ensuring reliable triggering across process variation and temperature. |
| VC @ IPPM | 45.4 V at 8.8 A - Clamped voltage during 10/1000 μs surge; determines worst-case overvoltage seen by downstream ICs. |
| PPPM | 400 W - Peak pulse power handling capability; validates protection against IEC 61000-4-5 Level 4 surges (e.g., 4 kV line-to-ground). |
| IFSM | 40 A - Non-repetitive forward surge current rating (8.3 ms half-sine); supports protection against load dump events in 12 V automotive systems. |
| TJ max | 150 °C - Maximum junction temperature; enables operation in under-hood automotive environments with proper PCB thermal design. |
| Package | SMA (DO-214AC) - Standard surface-mount outline with 2.54 mm lead pitch; compatible with JEDEC MS-013 and automated pick-and-place. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads; cathode indicated by a band on the body end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry (unidirectional) | Connected to ground or lower-potential rail; completes shunt path during transient clamp. |
| Cathode | Reverse-biased terminal (marked with band) | Connected to protected line (e.g., 12 V supply or signal); conducts when voltage exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units, body electronics, and ADAS sensors. |
| 400 W peak pulse power | Withstands IEC 61000-4-5 4 kV surge tests on 2 Ω source impedance without degradation. |
| Glass passivated junction | Ensures stable VBR and low leakage across temperature (-55 °C to +150 °C) and lifetime. |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard reflow without baking; simplifies manufacturing logistics. |
| Low clamping ratio (VC/VBR ≈ 1.37) | Minimizes overvoltage stress on protected MOSFETs or microcontrollers during transients. |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface |
|---|---|
Use Scenario: Protecting 12 V supply rails in vehicle infotainment modules from load dump and jump-start transients. IC Role / Device Role / Timing Role: Unidirectional shunt TVS placed between battery rail and system ground to clamp surges above 31.1 V. Use Value: Limits clamped voltage to 45.4 V, preventing damage to downstream DC-DC converters and microcontrollers rated for 40 V absolute maximum. | Use Scenario: Safeguarding analog output lines (e.g., 4–20 mA current loops) in factory automation sensors. IC Role / Device Role / Timing Role: Bidirectional-capable variant not used; SMAJ28AHE3/61 serves unidirectional protection on powered signal lines referenced to local ground. Use Value: Withstands repeated 1 kV EFT bursts per IEC 61000-4-4 due to fast <1 ns response and low dynamic impedance. |
| Telecom Power Input | Consumer USB Port Protection |
Use Scenario: Shielding PoE-powered network switches from induced lightning surges on DC input lines. IC Role / Device Role / Timing Role: Primary shunt clamp on 48 V input bus, coordinated with upstream fuse and common-mode chokes. Use Value: 400 W rating handles multi-pulse surge stress; 150 °C TJ max supports operation in sealed enclosures with elevated ambient temperatures. | Use Scenario: Adding secondary-level overvoltage protection on VBUS line of USB-C host ports in laptops and docking stations. IC Role / Device Role / Timing Role: Secondary TVS after primary protection; placed close to USB controller IC to limit residual clamping voltage. Use Value: Low 45.4 V clamping prevents latch-up or gate oxide damage in USB PHY ICs with 5.5 V absolute max ratings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ28A-E3/61 | Same electrical specs and package; RoHS-compliant commercial grade without AEC-Q101 qualification. | Lacks automotive qualification; suitable for industrial/commercial designs where AEC-Q101 is not mandated. | Select when cost sensitivity outweighs automotive reliability requirements and qualification documentation is not required. |
| SMAJ28AHM3/61 | Halogen-free, RoHS-compliant, and AEC-Q101 qualified; identical VWM, VBR, VC, and PPPM. | Meets halogen-free material compliance mandates (e.g., IPC-1752, EU RoHS recast); same automotive use case. | Choose when halogen-free content is required for environmental compliance or specific OEM material declarations. |
Compared with SMAJ28AHE3/61, the SMAJ28A-E3/61 offers identical protection performance without automotive qualification, while SMAJ28AHM3/61 adds halogen-free construction-both retain the same clamping behavior, thermal profile, and PCB footprint, enabling direct substitution where qualification or material constraints permit.
Availability
SMAJ28AHE3/61 is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor systems, and telecom power input circuits requiring stable component supply, long-term lifecycle support, and AEC-Q101 assurance.
Supply support for SMAJ28AHE3/61 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, MOSFETs, and protection devices with emphasis on reliability and application-specific validation.
The SMAJ series is engineered for high-energy transient suppression in harsh environments, targeting automotive, industrial, and telecom applications where robustness, consistency, and qualification compliance are critical.
FAQ
What is the clamping voltage of SMAJ28AHE3/61 at its rated peak pulse current?
The SMAJ28AHE3/61 has a maximum clamping voltage (VC) of 45.4 V at its rated peak pulse current (IPPM) of 8.8 A, measured under the standard 10/1000 μs double-exponential surge waveform. This value defines the upper voltage limit imposed on protected circuitry during a worst-case transient event and is confirmed in Vishay's official datasheet revision 09-Jan-2024, Document Number 88390.
Is SMAJ28AHE3/61 qualified for automotive applications?
Yes, SMAJ28AHE3/61 is AEC-Q101 qualified, as explicitly stated in the Vishay datasheet under "Mechanical Data" and "Ordering Information" sections. The "HE3" suffix denotes RoHS-compliant and AEC-Q101 qualified variants, making SMAJ28AHE3/61 suitable for use in automotive ECUs, body control modules, and ADAS subsystems where qualification is mandatory.
What package type does SMAJ28AHE3/61 use, and what are its key mechanical features?
SMAJ28AHE3/61 uses the SMA (DO-214AC) surface-mount package: a low-profile, rectangular molded case with 2.54 mm lead pitch and cathode band marking. Key mechanical features include UL 94 V-0 flammability rating, matte tin-plated leads compliant with J-STD-002 solderability, and MSL Level 1 rating for unlimited floor life-enabling direct integration into high-volume automated assembly lines.
How does the breakdown voltage range of SMAJ28AHE3/61 compare to its standoff voltage?
The SMAJ28AHE3/61 has a standoff voltage (VWM) of 28 V and a guaranteed breakdown voltage (VBR) range of 31.1 V to 34.4 V at 1 mA test current. This 3.1–6.4 V margin ensures reliable non-conduction during normal operation while guaranteeing activation before damaging overvoltage occurs, a critical design margin validated across temperature and process variation.
Can SMAJ28AHE3/61 be used in bidirectional protection configurations?
No, SMAJ28AHE3/61 is a unidirectional TVS diode, as indicated by the "A" suffix and presence of a cathode band. For bidirectional protection, Vishay specifies the "CA" suffix (e.g., SMAJ28CA). Using SMAJ28AHE3/61 in reverse-biased configurations risks permanent failure due to forward conduction during negative transients-always match suffix and polarity marking to system grounding architecture.
SMAJ28AHE3/61 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):
- 28V
- Voltage - Breakdown (Min):
- 31.1V
- Voltage - Clamping (Max) @ Ipp:
- 45.4V
- Current - Peak Pulse (10/1000µs):
- 8.8A
- 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)
SMAJ28AHE3/61 FAQ
1.How can I place an order for SMAJ28AHE3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ28AHE3/61 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 SMAJ28AHE3/61 reliable?
The price and inventory of SMAJ28AHE3/61 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ28AHE3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ28AHE3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ28AHE3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ28AHE3/61?
SMAJ28AHE3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ28AHE3/61 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 SMAJ28AHE3/61?
For technical support, including SMAJ28AHE3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ28AHE3/61 requirements.
6.How does Aetrix verify that SMAJ28AHE3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ28AHE3/61 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 SMAJ28AHE3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ28AHE3/61?
All SMAJ28AHE3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ28AHE3/61, 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 SMAJ28AHE3/61 part is unused and in its original packaging.
Return procedure for SMAJ28AHE3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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