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Vishay General Semiconductor - Diodes Division SMA6J28A-E3/61
- Part No.:
- SMA6J28A-E3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMA6J28A-E3/61.pdf
- Description:
- TVS DIODE 28VWM 51.6VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMA6J28A-E3/61 from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping voltage transients up to 44.0 V at 13.6 A (10/1000 μs), with 600 W peak pulse power rating, 28 V stand-off voltage, and 31.1–34.4 V breakdown voltage range. It protects MOSFETs, ICs, and sensor signal lines in industrial and telecom power supply interfaces.
For engineers reviewing the SMA6J28A-E3/61 datasheet, SMA6J28A-E3/61 pinout, SMA6J28A-E3/61 application, or SMA6J28A-E3/61 equivalent, key selection criteria include clamping voltage at rated surge current, unidirectional polarity compatibility, SMA package thermal resistance (RθJA = 120 °C/W), and compliance with J-STD-020 MSL Level 1.
Technical Context
This TVS diode operates as a fast-acting shunt protector triggered by reverse-biased avalanche breakdown above VWM = 28 V. Its dynamic resistance of 0.704 Ω enables low-voltage clamping under 13.6 A transient surges, while its 150 °C maximum junction temperature supports operation in high-ambient industrial environments.
The device uses silicon planar construction with matte tin-plated leads solderable per J-STD-002, and meets UL 94 V-0 flammability requirements. Its unidirectional polarity-marked by cathode band-is fixed and not configurable, limiting use to DC-biased or single-polarity signal line protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - Maximum continuous reverse operating voltage before leakage exceeds 0.2 μA; sets upper limit for protected circuit DC bias. |
| VBR min/max | 31.1 V / 34.4 V at IT = 1 mA - Confirmed breakdown threshold range; ensures reliable turn-on above system overvoltage thresholds. |
| VC @ IPP | 44.0 V at 13.6 A (10/1000 μs) - Clamped voltage during standard surge event; determines maximum stress on downstream ICs. |
| PPPM (10×1000 μs) | 600 W - Peak transient energy handling capacity; defines survivability against common inductive-switching transients. |
| RθJA | 120 °C/W - Junction-to-ambient thermal resistance on 5.0 mm × 5.0 mm PCB copper pads; guides heatsinking and layout design. |
| IFSM | 50 A - Non-repetitive forward surge rating (8.3 ms half-sine); supports limited fault-current exposure without bond wire failure. |
| TJ max | +150 °C - Maximum allowable junction temperature; enables use in enclosed industrial enclosures without active cooling. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile plastic case with UL 94 V-0 molding compound and cathode band marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / transient return path | Connected to ground or low-impedance return in unidirectional clamp configuration; must be routed with minimal inductance. |
| Cathode | Protected line connection / clamping node | Connected to the line being protected (e.g., 24 V rail or sensor input); color band identifies this terminal. |
Key Features
| Feature | Design Value |
|---|---|
| Unidirectional polarity | Fixed cathode-band orientation eliminates polarity misplacement risk during automated placement; requires correct board silkscreen alignment. |
| MSL Level 1 rating | Compatible with standard SMT reflow profiles up to 260 °C peak; no floor-life management or baking required before assembly. |
| Low dynamic resistance (RD) | 0.704 Ω - Minimizes voltage overshoot during fast-rising transients, improving protection margin for 3.3 V or 5 V logic interfaces. |
| RoHS-compliant & whisker-tested | E3 suffix indicates matte tin plating qualified to JESD 201 Class 2; ensures long-term solder joint reliability in automotive and industrial deployments. |
| High IPPM capability | 13.6 A (10/1000 μs) - Supports protection of 24 V industrial buses subject to IEC 61000-4-5 Level 3 (1 kV/2 Ω) surges. |
Applications
| Industrial PLC I/O Protection | 24 V DC Power Rail Clamp |
|---|---|
Use Scenario: Protecting analog input channels of programmable logic controllers against field-wiring induced transients from solenoid switching. IC Role / Device Role / Timing Role: Shunt clamping element placed between signal line and ground, activated within nanoseconds of overvoltage detection. Use Value: Limits voltage seen by precision ADC front-end to ≤44.0 V, preserving measurement integrity and preventing latch-up in 24 V referenced signal chains. |
Use Scenario: Safeguarding 24 V DC distribution rails in factory automation cabinets exposed to motor drive noise and relay contact bounce. IC Role / Device Role / Timing Role: Standby-mode voltage clamp that conducts only during >28 V excursions, remaining high-impedance during normal operation. Use Value: Absorbs 600 W transient energy without degradation, enabling robust operation across temperature (-55 °C to +150 °C) and lifecycle requirements. |
| Telecom Line Interface Protection | Automotive Body Control Module Inputs |
Use Scenario: Shielding RS-485 transceiver pins in base station remote units from lightning-induced surges on long cable runs. IC Role / Device Role / Timing Role: Primary overvoltage suppression device placed directly at connector entry point, ahead of ESD diodes and filtering. Use Value: Clamps 8/20 μs surges up to 4000 W, meeting Telcordia GR-1089-CORE Level 3 immunity requirements for outdoor equipment. |
Use Scenario: Guarding wake-up inputs and sensor feeds in body control modules against load dump and jump-start events. IC Role / Device Role / Timing Role: Unidirectional transient suppressor connected between 12 V/24 V supply line and ground, with cathode tied to supply. Use Value: Withstands 50 A peak forward surge (8.3 ms), satisfying ISO 7637-2 Pulse 5a load-dump immunity testing for automotive electronics. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMA6J28CA-E3/61 | Bidirectional variant with symmetrical ±28 V stand-off; higher capacitance (≈100 pF vs. ≈30 pF) due to dual-junction structure. | Required where AC-coupled or bidirectional signal lines (e.g., USB D+/D−, CAN H/L) need symmetric clamping. | Select SMA6J28CA-E3/61 only if polarity reversal or AC transients are present; SMA6J28A-E3/61 is optimal for DC-biased rails. |
| SMCJ28A-E3/57T | Same VWM/VBR specs but in larger SMC (DO-214AB) package; higher PPPM = 1500 W (10×1000 μs) and lower RθJA = 40 °C/W. | Better suited for high-energy transients (>1 kV) or thermally constrained designs requiring lower junction temperature rise. | Choose SMCJ28A-E3/57T when surge energy exceeds 600 W or PCB copper area is insufficient to meet RθJA target with SMA footprint. |
Compared with SMA6J28CA-E3/61 and SMCJ28A-E3/57T, the SMA6J28A-E3/61 delivers optimal balance of compact size, cost, and 600 W surge capability for space-constrained 24 V DC systems-without sacrificing MSL Level 1 process compatibility or industrial temperature range.
Availability
SMA6J28A-E3/61 is available at Aetrix Electronics and suitable for industrial PLC I/O protection, 24 V DC power rail clamp, and telecom line interface protection requiring stable component supply, RoHS compliance, and J-STD-020 MSL Level 1 manufacturability.
Supply support for SMA6J28A-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 diodes, rectifiers, MOSFETs, and protection devices with emphasis on reliability, thermal performance, and AEC-Q200 qualification.
The SMA6J28A-E3/61 belongs to Vishay's Transient Voltage Suppressor (TVS) diode family engineered for robust electrostatic and surge protection in harsh industrial, telecom, and automotive environments.
FAQ
What is the clamping voltage of SMA6J28A-E3/61 at its rated peak pulse current?
The SMA6J28A-E3/61 has a maximum clamping voltage (VC) of 44.0 V at 13.6 A peak pulse current with a 10/1000 μs waveform. This value is measured under standardized test conditions and defines the upper voltage limit imposed on protected circuits during transient events. The SMA6J28A-E3/61 maintains this clamping performance across its specified operating temperature range.
Is SMA6J28A-E3/61 suitable for bidirectional signal lines like RS-485 or CAN bus?
No, SMA6J28A-E3/61 is unidirectional only and must be used with correct polarity-cathode connected to the protected line. For bidirectional applications such as RS-485 or CAN bus, the bidirectional variant SMA6J28CA-E3/61 is required. Using SMA6J28A-E3/61 on AC-coupled or polarity-reversing lines may result in improper clamping or device failure.
What is the thermal resistance and recommended PCB layout for SMA6J28A-E3/61?
The SMA6J28A-E3/61 has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on 5.0 mm × 5.0 mm copper pads per terminal. To achieve this rating, the PCB layout must use minimum recommended pad dimensions per Vishay's DO-214AC outline, avoid thermal isolation, and ensure adequate copper area for heat dissipation. The SMA6J28A-E3/61 relies on PCB copper for thermal management.
Does SMA6J28A-E3/61 meet lead-free soldering standards?
Yes, the SMA6J28A-E3/61 carries the "E3" suffix indicating RoHS-compliant, lead-free matte tin plating, qualified to J-STD-002 for solderability and JESD 201 Class 2 for whisker resistance. It supports peak reflow temperatures up to 260 °C and is rated MSL Level 1 per J-STD-020-no moisture sensitivity handling required prior to assembly.
How does SMA6J28A-E3/61 compare to SMA6J28CA-E3/61 in terms of leakage and capacitance?
The SMA6J28A-E3/61 exhibits lower reverse leakage (≤0.2 μA at 28 V) and lower junction capacitance (≈30 pF at zero bias) than the bidirectional SMA6J28CA-E3/61 (≈100 pF). This makes SMA6J28A-E3/61 preferable for high-speed or low-leakage DC applications, while SMA6J28CA-E3/61 trades off higher capacitance for symmetrical bipolar clamping capability. Both share identical VWM, VBR, and PPPM ratings.
SMA6J28A-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:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 28V
- Voltage - Breakdown (Min):
- 31.1V
- Voltage - Clamping (Max) @ Ipp:
- 51.6V
- Current - Peak Pulse (10/1000µs):
- 68A (8/20µs)
- Power - Peak Pulse:
- 4000W (4kW)
- 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)
SMA6J28A-E3/61 FAQ
1.How can I place an order for SMA6J28A-E3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA6J28A-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 SMA6J28A-E3/61 reliable?
The price and inventory of SMA6J28A-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 SMA6J28A-E3/61 is usually 5 days.
3.What payment methods are accepted for SMA6J28A-E3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA6J28A-E3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA6J28A-E3/61?
SMA6J28A-E3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA6J28A-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 SMA6J28A-E3/61?
For technical support, including SMA6J28A-E3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA6J28A-E3/61 requirements.
6.How does Aetrix verify that SMA6J28A-E3/61 is sourced from the original manufacturer or authorized distributors?
All SMA6J28A-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 SMA6J28A-E3/61 meets industry standards.
7.What is the process for return or replacement of SMA6J28A-E3/61?
All SMA6J28A-E3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMA6J28A-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 SMA6J28A-E3/61 part is unused and in its original packaging.
Return procedure for SMA6J28A-E3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMA6J28A-E3/61 Tags
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