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Vishay General Semiconductor - Diodes Division SMAJ28HE3/61
- Part No.:
- SMAJ28HE3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ28HE3/61.pdf
- Description:
- TVS DIODE 28VWM 50VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,610
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Product details
Overview
SMAJ28HE3/61 from Vishay General Semiconductor is a high-reliability, AEC-Q101-qualified unidirectional transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, designed for automotive and industrial surge protection. It features a 28 V stand-off voltage (VWM), 31.1–38.0 V breakdown voltage (VBR at 1 mA), 50.0 V maximum clamping voltage (VC) at 8.0 A peak pulse current, and 400 W peak pulse power rating with 10/1000 µs waveform.
For engineers reviewing the SMAJ28HE3/61 datasheet, SMAJ28HE3/61 pinout, SMAJ28HE3/61 application, or SMAJ28HE3/61 equivalent, this device is selected for robust overvoltage protection on DC power rails and signal lines where AEC-Q101 qualification, low leakage (<1 µA at VWM), and stable clamping under repetitive surge stress are required.
Technical Context
The SMAJ28HE3/61 employs a glass-passivated silicon junction optimized for fast response to transients (sub-nanosecond), with low incremental surge resistance enabling consistent clamping performance across surge events. Its thermal resistance (RθJA = 120 °C/W) and junction temperature range (–55 °C to +150 °C) support operation in harsh automotive under-hood environments.
It is rated for 40 A non-repetitive forward surge current (8.3 ms half-sine), meets MSL Level 1 per J-STD-020, and uses matte tin-plated leads compliant with J-STD-002 and JESD22-B102. The HE3 suffix confirms AEC-Q101 qualification and JESD201 Class 2 whisker resistance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VWM) | 28 V - Maximum continuous reverse operating voltage before significant leakage begins. |
| Breakdown Voltage (VBR) | 31.1–38.0 V at 1 mA - Confirmed avalanche onset range ensuring reliable turn-on during overvoltage events. |
| Clamping Voltage (VC) | 50.0 V at 8.0 A - Peak voltage seen by protected circuit during 10/1000 µs surge, limiting downstream stress. |
| Peak Pulse Power (PPPM) | 400 W - Sustained surge energy handling capability on standard 5.0 × 5.0 mm copper pads. |
| Reverse Leakage (ID) | <1 µA at 28 V - Minimal standby power loss and signal integrity impact in always-on systems. |
| Junction Temperature Range | –55 °C to +150 °C - Validated operation across full automotive ambient and self-heating conditions. |
| AEC-Q101 Qualified | Yes - Certified for automotive electronics per stress test requirements including HTOL, TCT, and ESD. |
Pinout & Package
DO-214AC (SMA) surface-mount package: molded epoxy case meeting UL 94 V-0, 0.208" × 0.157" footprint, cathode band marked on one end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection point | Connected to ground or return path; carries surge current to reference plane during clamping. |
| Cathode | High-side connection point | Connected to protected line (e.g., 24 V rail); polarity-sensitive-band denotes cathode end. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated reliability for automotive ECUs, body control modules, and ADAS sensors requiring long-term field stability. |
| 400 W peak pulse power | Withstands ISO 7637-2 Pulse 1, 2a, 3a/b, and IEC 61000-4-5 surges without degradation when mounted per recommended pad layout. |
| Glass-passivated junction | Ensures stable VBR and low leakage over temperature and lifetime, critical for safety-critical power monitoring circuits. |
| MSL Level 1 rating | Enables direct placement into reflow processes up to 260 °C peak without moisture-induced failure. |
| Matte tin plating | Guarantees solderability and intermetallic formation control per J-STD-002, reducing voiding risk in high-volume automotive assembly. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
Use Scenario: Protecting 24 V supply inputs of engine control units (ECUs) against load dump and inductive switching transients per ISO 16750-2. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and local regulator input to clamp surges above 35 V. Use Value: Limits voltage to ≤50.0 V during 400 W surges, preventing damage to downstream LDOs and microcontrollers rated for 36 V absolute max. |
Use Scenario: Shielding analog outputs (e.g., 4–20 mA current loop drivers) in factory automation sensors from ESD and cable discharge events. IC Role / Device Role / Timing Role: Bidirectional-capable unidirectional TVS (cathode grounded) guarding signal line against ±8 kV contact ESD per IEC 61000-4-2. Use Value: Sub-1 µA leakage preserves loop accuracy; 50.0 V clamping prevents op-amp saturation and ADC input clipping during transients. |
| Telecom DC Power Interface | Consumer Appliance Motor Drive Protection |
Use Scenario: Safeguarding PoE-powered network switches' 48 V input stage against lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: Primary TVS on DC input before DC-DC converter, configured anode-to-ground for unidirectional clamping. Use Value: 400 W rating handles IEC 61000-4-5 Combination Wave (10/700 µs) surges; DO-214AC footprint enables compact board layout near connector. |
Use Scenario: Suppressing commutation spikes from brushed DC motors in smart home appliances (e.g., vacuum cleaners, washing machines). IC Role / Device Role / Timing Role: TVS placed across motor terminals to absorb inductive kickback during MOSFET turn-off. Use Value: 40 A IFSM rating withstands repeated 8.3 ms half-sine surges; 150 °C TJ max supports sealed enclosure thermal environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ28AHE3/61 | Lower VBR range (31.1–34.4 V) and lower VC (45.4 V at 8.8 A); same AEC-Q101 qualification and package. | Better suited for tighter clamping tolerance requirements where 4.6 V lower VC improves margin for 36 V-rated ICs. | Select SMAJ28AHE3/61 when system-level surge testing requires sub-46 V clamping under identical 8 A test current. |
| SMCJ28HE3/61 | Same VWM/VBR/VC specs but in larger DO-214AB (SMC) package; 1500 W PPPM, higher IPPM (37.9 A), RθJA = 40 °C/W. | Used where higher single-event energy absorption or improved thermal dissipation is needed, e.g., main battery input vs. local rail. | Choose SMCJ28HE3/61 only if PCB space allows larger footprint and design must survive >1000 W surges without derating. |
Compared with SMAJ28HE3/61, SMAJ28AHE3/61 offers tighter clamping at the cost of reduced surge margin, while SMCJ28HE3/61 trades miniaturization for higher power handling-neither is pin-compatible, and both require layout revision.
Availability
SMAJ28HE3/61 is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor interfaces, and telecom power supplies requiring stable component supply with AEC-Q101 assurance and traceable lot history.
Supply support for SMAJ28HE3/61 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 designs and manufactures discrete semiconductors including diodes, rectifiers, and TVS devices, with emphasis on reliability, precision, and application-specific qualification.
The SMAJ series was developed specifically for high-reliability transient suppression in automotive and industrial environments, combining AEC-Q101 validation with standardized DO-214AC packaging for automated assembly.
FAQ
What is the clamping voltage of SMAJ28HE3/61 and how is it measured?
The SMAJ28HE3/61 has a maximum clamping voltage (VC) of 50.0 V, measured at 8.0 A peak pulse current using a 10/1000 µs waveform per IEC 61000-4-5. This value is guaranteed across temperature and lifetime when mounted on 0.2 × 0.2 inch copper pads. The clamping behavior is intrinsic to its silicon junction design and directly protects downstream components connected to the same rail as SMAJ28HE3/61.
Is SMAJ28HE3/61 suitable for bidirectional transient protection?
No, SMAJ28HE3/61 is a unidirectional TVS diode, indicated by the absence of "C" or "CA" suffix. It conducts only in reverse bias and must be installed with cathode toward the protected line. For true bidirectional protection, use SMAJ28CAHE3/61 instead-SMAJ28HE3/61 cannot suppress positive-going transients on grounded lines without additional circuitry.
Does SMAJ28HE3/61 meet automotive qualification standards?
Yes, SMAJ28HE3/61 carries the HE3 suffix, confirming full AEC-Q101 qualification per Vishay's documentation (Document Number 88390, Revision 29-Oct-08). This includes stress testing for high-temperature operating life, temperature cycling, and electrostatic discharge-making SMAJ28HE3/61 appropriate for under-hood and chassis-mounted automotive applications.
What is the maximum steady-state power dissipation of SMAJ28HE3/61?
SMAJ28HE3/61 is not rated for continuous power dissipation. Its thermal design centers on transient energy absorption: RθJA = 120 °C/W and PPPM = 400 W apply only to short-duration pulses (≤1000 µs). Steady-state power must remain negligible-reverse leakage is <1 µA at 28 V, yielding <28 µW. Any sustained forward conduction exceeds SMAJ28HE3/61's safe operating area.
How does the HE3 suffix differ from E3 in SMAJ28HE3/61?
The HE3 suffix denotes high-reliability, automotive-grade qualification (AEC-Q101) and JESD201 Class 2 whisker resistance, whereas E3 indicates commercial-grade RoHS compliance only. SMAJ28HE3/61 undergoes additional screening-including extended temperature cycling and accelerated life testing-that SMAJ28E3/61 does not. Both share the same electrical specs and DO-214AC package, but only SMAJ28HE3/61 is approved for automotive use.
SMAJ28HE3/61 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 28V
- Voltage - Breakdown (Min):
- 31.1V
- Voltage - Clamping (Max) @ Ipp:
- 50V
- Current - Peak Pulse (10/1000µs):
- 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)
SMAJ28HE3/61 FAQ
1.How can I place an order for SMAJ28HE3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ28HE3/61 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 SMAJ28HE3/61 reliable?
The price and inventory of SMAJ28HE3/61 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ28HE3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ28HE3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ28HE3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ28HE3/61?
SMAJ28HE3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ28HE3/61 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 SMAJ28HE3/61?
For technical support, including SMAJ28HE3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ28HE3/61 requirements.
6.How does Aetrix verify that SMAJ28HE3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ28HE3/61 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 SMAJ28HE3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ28HE3/61?
All SMAJ28HE3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ28HE3/61, 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 SMAJ28HE3/61 part is unused and in its original packaging.
Return procedure for SMAJ28HE3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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