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Vishay General Semiconductor - Diodes Division SA28A-E3/54
- Part No.:
- SA28A-E3/54
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA28A-E3/54.pdf
- Description:
- TVS DIODE 28VWM 45.4VC DO204AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,950
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Product details
Overview
SA28A-E3/54 from Vishay General Semiconductor is a unidirectional Transient Voltage Suppressor (TVS) diode in DO-15 package, designed for overvoltage protection of sensitive electronics. It features a 28 V stand-off voltage (VWM), 31.1–34.4 V breakdown voltage (VBR) at 1.0 mA, 45.4 V maximum clamping voltage (VC) at 11 A peak pulse current, and 500 W peak pulse power rating with 10/1000 µs waveform - used to safeguard MOSFETs, ICs, and sensor signal lines in industrial power supplies.
For engineers reviewing the SA28A-E3/54 datasheet, SA28A-E3/54 pinout, SA28A-E3/54 application, or SA28A-E3/54 equivalent, key selection criteria include its unidirectional polarity, glass-passivated junction, AEC-Q101 qualification (via HE3 variant), 175 °C max junction temperature, and DO-15 mechanical compatibility with legacy through-hole PCB layouts.
Technical Context
The SA28A-E3/54 operates as a clamping-type TVS diode that enters avalanche conduction when reverse voltage exceeds its VBR range (31.1–34.4 V), limiting transient-induced voltage spikes to ≤45.4 V at 11 A. Its low incremental surge resistance and fast response time ensure effective suppression of ESD, inductive switching transients, and lightning surges.
It is rated for 3.0 W steady-state power dissipation on an infinite heatsink at 75 °C lead temperature and supports 70 A non-repetitive forward surge current (10 ms half-sine). The device uses a glass-passivated chip junction and matte tin-plated leads compliant with J-STD-002 and JESD 22-B102 solderability standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - Maximum continuous reverse operating voltage before clamping begins; defines circuit's normal operating margin. |
| VBR @ IT = 1.0 mA | 31.1–34.4 V - Breakdown threshold range; ensures reliable turn-on during transients without false triggering. |
| VC @ IPPM = 11 A | 45.4 V - Clamped voltage under 10/1000 µs surge; determines protected circuit's maximum stress level. |
| PPPM | 500 W - Peak pulse power handling capability; validates robustness against IEC 61000-4-5 Level 4 surges. |
| IFSM | 70 A - Non-repetitive forward surge rating; supports high-energy inrush or fault-current events in DC power rails. |
| TJ max. | 175 °C - Maximum junction temperature; enables operation in high-ambient environments like motor drives and automotive under-hood modules. |
| Package | DO-15 (DO-204AC) - Standard axial-leaded through-hole package; compatible with wave-soldering and manual repair workflows. |
Pinout & Package
DO-15 (DO-204AC) package: axial-leaded, molded epoxy body with glass-passivated chip junction; matte tin-plated leads; cathode indicated by color band on one end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / transient return path | Connected to ground or low-impedance return node in unidirectional clamp configuration. |
| Cathode | Reverse-biased clamping node | Connected to protected line (e.g., 24 V rail or sensor input); color band identifies this terminal. |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated chip junction | Enables stable, repeatable avalanche characteristics and long-term reliability under repetitive surge stress. |
| 500 W peak pulse power (10/1000 µs) | Meets IEC 61000-4-5 surge immunity requirements for industrial equipment up to Level 4 (4 kV line-to-earth). |
| AEC-Q101 qualified (HE3 variant) | Validates suitability for automotive electronics where qualification beyond commercial grade is mandatory. |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients, improving protection margin for downstream CMOS ICs. |
| Solder dip rated 275 °C / 10 s | Supports standard wave-soldering processes without degradation of junction integrity or clamping performance. |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
Use Scenario: Protection of gate drivers and MCU I/O against inductive kickback from relay coils and solenoid loads. IC Role / Device Role / Timing Role: Unidirectional TVS placed between 24 V supply rail and ground, clamping transients before they reach logic-level components. Use Value: Limits voltage excursion to ≤45.4 V during 11 A surges, preventing latch-up or oxide damage in 3.3 V/5 V microcontrollers and gate drivers. | Use Scenario: Safeguarding LIN bus transceivers and sensor inputs (e.g., ambient temperature, door position) from load dump and jump-start events. IC Role / Device Role / Timing Role: Standoff-rated TVS on power input and signal lines, leveraging 28 V VWM to tolerate nominal 24 V system with margin. Use Value: Withstands 70 A forward surge and operates up to 175 °C, meeting AEC-Q101 thermal and surge requirements for under-dash modules. |
| Telecom Power Feeds | PLC Analog Input Protection |
Use Scenario: Overvoltage hardening of -48 V DC telecom power distribution boards exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Primary clamping device on feed lines, coordinated with upstream fuses and secondary filtering. Use Value: 500 W pulse rating and 45.4 V clamping enable compliance with Telcordia GR-1089-CORE Level 3 surge testing (2 kV differential mode). | Use Scenario: Protecting 4–20 mA current-loop analog inputs in programmable logic controllers from field-wiring faults and ESD. IC Role / Device Role / Timing Role: Low-leakage (≤1.0 µA at 28 V) unidirectional suppressor placed across input terminals. Use Value: Maintains signal accuracy with <1 µA reverse leakage while clamping transients to safe levels for precision op-amps and ADC front-ends. |
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 | Same VWM (28 V), but SMC (DO-214AB) surface-mount package; slightly higher VC (48.4 V @ 10.3 A). | Requires PCB redesign for SMT layout; better suited for space-constrained, automated assembly. | Select SMAJ28A when migrating to surface-mount production or needing higher thermal mass via copper pour. |
| P6SMB28A | Same VWM and DO-214AA (SMB) package; identical 500 W rating but lower IPPM (10.3 A) and higher VC (48.4 V). | Lower surge current handling; less effective for high-energy inductive transients. | Choose P6SMB28A only if DO-15 footprint is unavailable and SMB board area is constrained. |
Compared with SMAJ28A and P6SMB28A, the SA28A-E3/54 offers proven through-hole mechanical robustness, direct compatibility with legacy DO-15 footprints, and optimal clamping performance (45.4 V) for 24 V systems - making it ideal for industrial repairs, prototyping, and cost-sensitive through-hole designs.
Availability
SA28A-E3/54 is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, and telecom power feeds requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SA28A-E3/54 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, ruggedness, and automotive-grade qualification.
The SAxxA series belongs to Vishay's TRANSZORB® TVS family, engineered specifically for robust, cost-effective overvoltage protection in harsh environments including industrial automation, transportation, and infrastructure systems.
FAQ
What is the polarity configuration of the SA28A-E3/54?
The SA28A-E3/54 is a unidirectional TVS diode: it conducts in forward bias like a standard diode and clamps in reverse bias above its breakdown voltage. The cathode is marked by a color band on the DO-15 body. This configuration is used where DC polarity is fixed and only reverse transients require suppression - unlike bidirectional types (e.g., SA28CA) which protect AC or floating lines.
Does the SA28A-E3/54 meet AEC-Q101 qualification?
The SA28A-E3/54 itself is RoHS-compliant commercial-grade; however, the HE3 variant (e.g., SA28AHE3/54) is explicitly AEC-Q101 qualified per the Vishay datasheet. For automotive applications requiring qualification, SA28AHE3/54 must be specified - the E3 suffix alone does not confer AEC-Q101 status.
What is the maximum clamping voltage of the SA28A-E3/54 under surge conditions?
The SA28A-E3/54 has a maximum clamping voltage (VC) of 45.4 V at 11 A peak pulse current (IPPM) with a 10/1000 µs waveform. This value is guaranteed across temperature and represents the upper limit of voltage seen by protected circuitry during standardized surge events.
Can the SA28A-E3/54 be used in place of a bidirectional TVS like SA28CA?
No - the SA28A-E3/54 is unidirectional and lacks symmetrical clamping behavior. Replacing SA28CA (bidirectional) with SA28A-E3/54 would leave positive-going transients unprotected on AC-coupled or floating lines. Use only SA28A-E3/54 where circuit polarity is strictly defined and reverse-only transients occur.
What is the lead finish and solderability specification for SA28A-E3/54?
The SA28A-E3/54 features matte tin-plated leads compliant with J-STD-002 and JESD 22-B102 for solderability, and passes JESD 201 Class 1A whisker testing. It supports solder dip at 275 °C for up to 10 seconds, aligning with standard wave-soldering process windows.
SA28A-E3/54 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-204AC, DO-15, Axial
- 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:
- 45.4V
- Current - Peak Pulse (10/1000µs):
- 11A
- Power - Peak Pulse:
- 500W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-204AC (DO-15)
SA28A-E3/54 FAQ
1.How can I place an order for SA28A-E3/54 through Aetrix?
Please submit a Request for Quotation (RFQ) for SA28A-E3/54 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 SA28A-E3/54 reliable?
The price and inventory of SA28A-E3/54 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA28A-E3/54 is usually 5 days.
3.What payment methods are accepted for SA28A-E3/54?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA28A-E3/54 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA28A-E3/54?
SA28A-E3/54 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA28A-E3/54 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 SA28A-E3/54?
For technical support, including SA28A-E3/54 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA28A-E3/54 requirements.
6.How does Aetrix verify that SA28A-E3/54 is sourced from the original manufacturer or authorized distributors?
All SA28A-E3/54 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 SA28A-E3/54 meets industry standards.
7.What is the process for return or replacement of SA28A-E3/54?
All SA28A-E3/54 units undergo pre-shipment inspection (PSI). If there is an issue with SA28A-E3/54, 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 SA28A-E3/54 part is unused and in its original packaging.
Return procedure for SA28A-E3/54:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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