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Vishay General Semiconductor - Diodes Division SMAJ28-E3/61
- Part No.:
- SMAJ28-E3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ28-E3/61.pdf
- Description:
- TVS DIODE 28VWM 50VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,426
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Product details
Overview
SMAJ28-E3/61 from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in DO-214AC (SMA) package, designed for clamping voltage transients on power and signal lines. 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 - suitable for protecting MOSFETs, ICs, and sensor interfaces in industrial power supplies.
For engineers reviewing the SMAJ28-E3/61 datasheet, SMAJ28-E3/61 pinout, SMAJ28-E3/61 application, or SMAJ28-E3/61 equivalent, this page delivers verified electrical parameters, JEDEC-compliant DO-214AC terminal configuration, RoHS-compliant commercial-grade construction, and direct alternative options for overvoltage protection design validation.
Technical Context
This unidirectional TVS diode operates as a voltage-clamping device triggered by transient overvoltage events exceeding its reverse stand-off voltage of 28 V. Its glass-passivated junction ensures stable breakdown behavior and low leakage (<1 µA at VWM), while its 120 °C/W junction-to-ambient thermal resistance supports operation up to +150 °C junction temperature.
The device responds within picoseconds to ESD and surge events, delivering consistent clamping performance under repetitive 10/1000 µs pulses at 0.01% duty cycle. Its 40 A IFSM rating enables robust handling of 8.3 ms half-sine surges - critical for automotive load-dump and industrial inductive switching protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - Maximum continuous reverse operating voltage before clamping initiates |
| VBR (min/max) | 31.1 V / 38.0 V at 1 mA - Confirmed breakdown range ensuring reliable turn-on margin above VWM |
| VC @ IPPM | 50.0 V at 8.0 A - Clamped voltage during 10/1000 µs surge, limiting downstream stress |
| PPPM | 400 W - Peak pulse power dissipation capability under standard surge waveform |
| IFSM | 40 A - Non-repetitive forward surge current rating for 8.3 ms half-sine wave |
| Junction Temp Range | −55 °C to +150 °C - Validated operating and storage range for harsh-environment deployment |
Pinout & Package
Package: DO-214AC (SMA), surface-mount, matte tin-plated leads, RoHS-compliant commercial grade (E3 suffix), MSL Level 1 per J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Reverse-biased anode connection point | Connected to protected line; clamps when voltage exceeds VWM in reverse direction |
| Anode | Reference/ground return path | Typically tied to system ground or low-impedance return plane to complete clamping loop |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 µs) | Enables protection against IEC 61000-4-5 Level 3 (1 kV/2 Ω) surges without derating |
| Glass-passivated chip junction | Ensures long-term parameter stability and low leakage drift across temperature and life cycles |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients, improving protection margin |
| MSL Level 1, 260 °C reflow compatible | Supports standard lead-free SMT assembly without preconditioning or special handling |
Applications
| Industrial Power Supply Inputs | Automotive Sensor Signal Lines |
|---|---|
Use Scenario: 24 V DC input rails exposed to load dump and relay coil flyback in PLC modules and motor drives. IC Role / Device Role / Timing Role: Unidirectional TVS placed between input rail and chassis ground to clamp transients before they reach DC-DC converters. Use Value: Limits voltage excursion to ≤50.0 V during 400 W surges, preventing damage to upstream rectifiers and downstream regulators. |
Use Scenario: CAN and LIN bus lines connected to temperature/pressure sensors in engine control units. IC Role / Device Role / Timing Role: Standoff-rated TVS on differential signal pair to suppress ESD and coupled noise without loading data lines. Use Value: Sub-1 µA leakage at 28 V ensures no signal integrity degradation; fast response preserves bit timing under 8 kV contact ESD. |
| Consumer Equipment AC-DC Adapters | Telecom Base Station DC Feeds |
Use Scenario: Secondary-side 24 V output rails in wall adapters powering IoT gateways and smart home hubs. IC Role / Device Role / Timing Role: Final-stage transient guard before USB-PD controllers and microcontrollers. Use Value: 50.0 V clamping protects 3.3 V/5 V logic rails via series impedance; DO-214AC footprint allows high-density layout. |
Use Scenario: −48 V DC distribution feeds in 4G/5G remote radio units subjected to lightning-induced surges. IC Role / Device Role / Timing Role: Primary overvoltage clamp on feed line prior to DC-DC isolation stage. Use Value: 40 A IFSM withstands multi-cycle 8.3 ms surges; 150 °C max junction temp supports sealed outdoor enclosures. |
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 | Lower VBR range (31.1–34.4 V); tighter 10% VWM tolerance (28 V ±10%) vs. standard 28 V nominal | Better suited for precision clamping where lower turn-on threshold reduces let-through energy | Select SMAJ28A-E3/61 when tighter VBR consistency is required; otherwise SMAJ28-E3/61 offers broader margin for variable supply rails |
| SMBJ28A-E3/52 | DO-214AA (SMB) package; same VWM/VC specs but higher PPPM (600 W) and IPPM (17.3 A) | Higher surge capacity for systems requiring extended immunity beyond IEC 61000-4-5 Level 4 | Choose SMBJ28A-E3/52 only if PCB layout allows larger footprint and higher surge headroom is mandatory |
Compared with SMAJ28A-E3/61, the SMAJ28-E3/61 provides wider VBR tolerance for relaxed design margins; versus SMBJ28A-E3/52, it trades surge capacity for space-constrained layouts - making SMAJ28-E3/61 optimal for cost-sensitive, high-volume 24 V industrial interfaces.
Availability
SMAJ28-E3/61 is available at Aetrix Electronics and suitable for industrial power supplies, automotive sensor interfaces, consumer adapter outputs, and telecom DC feeds requiring stable component supply with full traceability and volume scalability.
Supply support for SMAJ28-E3/61 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 high-reliability diodes, MOSFETs, optoelectronics, and passive components for demanding industrial and automotive applications.
The SMAJ series is part of Vishay's TRANSZORB® TVS platform, engineered specifically for robust, low-leakage transient suppression in space-constrained surface-mount designs across consumer, computing, and industrial markets.
FAQ
What is the maximum clamping voltage of SMAJ28-E3/61 under a 10/1000 µs surge?
The SMAJ28-E3/61 has a maximum clamping voltage (VC) of 50.0 V at 8.0 A peak pulse current (IPPM) under the standardized 10/1000 µs waveform. This value is measured per Figure 1 in Vishay document 88390 and defines the upper voltage limit imposed on protected circuitry during surge events - critical for ensuring downstream ICs remain within absolute maximum ratings. The SMAJ28-E3/61 maintains this clamping performance across its full operating temperature range.
Is SMAJ28-E3/61 unidirectional or bidirectional, and how is polarity identified?
SMAJ28-E3/61 is a unidirectional TVS diode. Polarity is indicated by a cathode band on the DO-214AC (SMA) package body - the banded end corresponds to the cathode terminal, which must be connected toward the line being protected, while the anode connects to ground or reference potential. Bidirectional variants use the "CA" suffix (e.g., SMAJ28CA); the SMAJ28-E3/61 designation confirms unidirectional functionality per Vishay's ordering nomenclature in document 88390.
What is the reverse leakage current of SMAJ28-E3/61 at its rated stand-off voltage?
At its 28 V reverse stand-off voltage (VWM) and ambient temperature of 25 °C, the SMAJ28-E3/61 exhibits a maximum reverse leakage current (ID) of 1.0 µA. This ultra-low leakage ensures minimal power loss and no signal distortion in high-impedance circuits such as sensor bias networks or analog front-ends. The specification is validated per Table 1 in Vishay document 88390 and remains stable across the full −55 °C to +150 °C junction temperature range.
Does SMAJ28-E3/61 meet automotive qualification standards?
No, SMAJ28-E3/61 is the commercial-grade variant (E3 suffix) and is not AEC-Q101 qualified. For automotive applications, Vishay specifies the HE3 suffix (e.g., SMAJ28HE3/61), which undergoes additional stress testing per AEC-Q101 and is rated for high-reliability automotive environments. The SMAJ28-E3/61 is intended for industrial, consumer, and telecom equipment where commercial-grade reliability suffices - confirmed by its base P/N-E3 designation in the Mechanical Data section of document 88390.
What is the thermal resistance and maximum junction temperature for SMAJ28-E3/61?
The SMAJ28-E3/61 has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on 0.2 × 0.2 inch copper pads, and a maximum operating junction temperature (TJ) of +150 °C. These values are specified in the Thermal Characteristics table of Vishay document 88390 and define the device's thermal limits during sustained surge events or elevated ambient conditions - essential for calculating safe power derating in enclosed or high-temperature deployments.
SMAJ28-E3/61 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ28-E3/61 FAQ
1.How can I place an order for SMAJ28-E3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ28-E3/61 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 SMAJ28-E3/61 reliable?
The price and inventory of SMAJ28-E3/61 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ28-E3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ28-E3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ28-E3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ28-E3/61?
SMAJ28-E3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ28-E3/61 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 SMAJ28-E3/61?
For technical support, including SMAJ28-E3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ28-E3/61 requirements.
6.How does Aetrix verify that SMAJ28-E3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ28-E3/61 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 SMAJ28-E3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ28-E3/61?
All SMAJ28-E3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ28-E3/61, 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 SMAJ28-E3/61 part is unused and in its original packaging.
Return procedure for SMAJ28-E3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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