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Vishay General Semiconductor - Diodes Division SA28HE3/54
- Part No.:
- SA28HE3/54
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA28HE3/54.pdf
- Description:
- TVS DIODE 28VWM 50.1VC DO204AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,801
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Product details
Overview
SA28HE3/54 from Vishay General Semiconductor is a uni-directional Transient Voltage Suppressor (TVS) diode in DO-204AC (DO-15) package, designed for primary overvoltage protection of DC power rails and signal lines. 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 in automotive power supply input stages and industrial sensor interface protection.
For engineers reviewing the SA28HE3/54 datasheet, SA28HE3/54 pinout, SA28HE3/54 application, or SA28HE3/54 equivalent, this part delivers AEC-Q101 qualified surge immunity for 12 V and 24 V automotive systems, supports high-reliability soldering per J-STD-002, and provides verified clamping performance under repetitive transients induced by inductive load switching.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: when reverse voltage exceeds VBR, it avalanches to divert surge current away from downstream circuitry. Its glass-passivated junction ensures stable leakage (<1.0 µA at VWM) and low incremental surge resistance, enabling fast response (<1 ns) and repeatable clamping across temperature (–55 °C to +175 °C).
The SA28HE3/54 is rated for 70 A non-repetitive forward surge current (IFSM) and exhibits a 3.5 V maximum forward voltage at 100 A - critical for minimizing conduction loss during fault conditions. Its DO-204AC package supports manual and automated assembly with matte tin-plated leads compliant to JESD 22-B102 and JESD 201 Class 2 whisker testing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC rail margin for 24 V nominal systems. |
| VBR (min/max) | 31.1 V / 34.4 V at 1.0 mA - Confirmed avalanche onset range; ensures predictable turn-on without premature conduction. |
| VC @ IPPM | 45.4 V at 11 A - Measured clamping voltage under 10/1000 µs surge; limits protected IC voltage stress to safe levels. |
| PPPM | 500 W - Peak pulse power handling capability; sustains single-event transients like ISO 7637-2 Pulse 1/2a/5a. |
| IFSM | 70 A - Non-repetitive forward surge rating; accommodates high-energy inrush or fault currents without bond-wire failure. |
| TJ max | +175 °C - Maximum junction temperature; enables operation in under-hood automotive environments and high-ambient industrial enclosures. |
| AEC-Q101 | Qualified - Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD; suitable for ASIL-B supporting functions. |
Pinout & Package
Package: DO-204AC (DO-15), axial-leaded, molded epoxy case with UL 94 V-0 flammability rating. Cathode indicated by color band on one end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Surge return path | Connected to ground or low-impedance return in uni-directional configuration; completes clamping loop during transient events. |
| Cathode | Protected line connection / Clamping node | Connected to the line being protected (e.g., 24 V rail); avalanche conduction occurs between cathode and anode when VRM exceeded. |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated junction | Ensures stable VBR tolerance and low leakage (<1.0 µA) across temperature and lifetime - critical for low-power sensor nodes. |
| 500 W peak pulse power (10/1000 µs) | Withstands automotive load-dump surges up to ISO 7637-2 Level IV without degradation; validated for ≥1000 pulses at rated duty cycle. |
| AEC-Q101 qualification | Includes HTGB, TC, AC/DC life test, and ESD (HBM ≥8 kV) - meets requirements for engine control, body electronics, and ADAS power domains. |
| Matte tin-plated leads | Enables reliable reflow and wave soldering per J-STD-002; JESD 201 Class 2 whisker resistance prevents latent field failures in high-vibration environments. |
| Low clamping ratio (VC/VBR ≈ 1.36) | Minimizes voltage overshoot during clamping - protects 30 V-rated MOSFETs and 3.3 V/5 V logic interfaces downstream of the TVS node. |
Applications
| Automotive Power Input Protection | Industrial Sensor Signal Line Protection |
|---|---|
Use Scenario: Protecting 24 V battery-fed ECUs against load dump and alternator ripple transients per ISO 7637-2. IC Role / Device Role / Timing Role: Primary shunt clamping device placed at main power entry point before DC/DC converter input. Use Value: Limits transient voltage to ≤45.4 V, preventing damage to upstream fuse boxes and downstream PMICs rated for 40 V max input. |
Use Scenario: Safeguarding analog outputs of pressure/temperature sensors connected to PLC analog input modules. IC Role / Device Role / Timing Role: Low-capacitance (≈100 pF) uni-directional clamp on 0–10 V or 4–20 mA output lines exposed to EMI and cable coupling. Use Value: Clamps induced surges to <46 V while maintaining signal integrity - avoids false triggering and ADC saturation in measurement circuits. |
| Telecom DC Power Feeds | Consumer Appliance Motor Drive Inputs |
Use Scenario: Overvoltage protection on –48 V telecom rectifier outputs feeding base station backplane power distribution. IC Role / Device Role / Timing Role: Standoff-rated TVS placed after bulk filtering but before hot-swap controllers and POL regulators. Use Value: Withstands repeated 100 V/10 ms surges (IEC 61000-4-5) without parameter shift; maintains system uptime in outdoor cabinet deployments. |
Use Scenario: Input rail protection for BLDC motor driver boards in washing machines and HVAC fans subjected to relay contact bounce. IC Role / Device Role / Timing Role: Fast-response clamping element across bridge rectifier output to suppress commutation spikes. Use Value: Limits spike amplitude to 45.4 V within <1 ns, preventing gate oxide rupture in 60 V MOSFETs and reducing EMI filter burden. |
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-E3/52 (Vishay) | Same VWM (28 V), lower PPPM (400 W), SMA package (smaller footprint, lower thermal mass) | Better suited for space-constrained PCBs with moderate surge exposure (e.g., USB-C PD ports); less robust for automotive load dump. | Select SMAJ28A-E3/52 only if board area is critical and surge energy is limited to ≤400 W; verify thermal derating at TL > 75 °C. |
| 1.5KE27A (ON Semiconductor) | Higher VWM (27 V), same VC (45.4 V), higher IFSM (100 A), DO-201AD package (larger lead spacing) | Compatible with legacy through-hole layouts requiring 0.2" lead pitch; slightly tighter VWM/VBR margin may increase leakage risk in low-power sleep modes. | Choose 1.5KE27A where existing DO-201AD tooling exists or where higher surge current margin is prioritized over AEC-Q101 compliance. |
Compared with SA28HE3/54, SMAJ28A-E3/52 trades peak power and thermal robustness for compactness, while 1.5KE27A offers greater surge current headroom but lacks automotive qualification and uses a physically larger package - making SA28HE3/54 the optimal choice for AEC-Q101–mandated 24 V systems requiring proven 500 W clamping.
Availability
SA28HE3/54 is available at Aetrix Electronics and suitable for automotive electronic control units, industrial programmable logic controller (PLC) I/O modules, and telecom power feed applications requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SA28HE3/54 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, and protection devices with emphasis on reliability, efficiency, and automotive-grade qualification.
The SAxxA series was developed specifically for robust transient suppression in harsh environments - targeting automotive, industrial, and telecom infrastructure where failure due to voltage surges must be eliminated.
FAQ
What is the clamping voltage of SA28HE3/54 at its rated peak pulse current?
The SA28HE3/54 has a maximum clamping voltage (VC) of 45.4 V at 11 A peak pulse current (IPPM) under the standard 10/1000 µs waveform. This value is measured and guaranteed per the Vishay datasheet (Document Number: 88378), ensuring predictable overvoltage limiting for downstream components such as 30 V-rated MOSFETs or 5 V logic interfaces. The SA28HE3/54 maintains this clamping performance across its full operating temperature range.
Is SA28HE3/54 qualified for automotive applications?
Yes, SA28HE3/54 carries AEC-Q101 qualification, confirmed in the Vishay datasheet revision 18-Sep-12. It has passed stress tests including high-temperature reverse bias (HTRB), temperature cycling, and electrostatic discharge (HBM ≥8 kV). This makes SA28HE3/54 suitable for automotive powertrain, body control, and ADAS subsystems where reliability under thermal and electrical stress is mandatory - unlike commercial-grade variants without the HE3 suffix.
What does the "HE3" suffix indicate in SA28HE3/54?
The "HE3" suffix in SA28HE3/54 denotes RoHS-compliant construction with AEC-Q101 qualification and JESD 201 Class 2 whisker resistance. It distinguishes this variant from the base "E3" version (commercial grade) and confirms enhanced reliability for automotive and industrial use. The "54" refers to the preferred package code for 13-inch paper tape and reel packaging with 4000 units per reel - a detail specified in Vishay's ordering information table.
Can SA28HE3/54 be used in bi-directional protection circuits?
No, SA28HE3/54 is a uni-directional TVS diode, as indicated by the "A" (not "CA") suffix and the presence of a cathode band marking. Bi-directional operation requires the "CA" suffix (e.g., SA28CA), which has symmetrical breakdown in both polarities. Using SA28HE3/54 in AC or floating signal paths would result in unintended forward conduction - always verify polarity marking and datasheet designation before placement.
What is the maximum steady-state power dissipation for SA28HE3/54?
The SA28HE3/54 has a maximum steady-state power dissipation (PD) of 3.0 W when mounted on an infinite heatsink at lead temperature (TL) = 75 °C, per Figure 5 in the Vishay datasheet. This rating decreases linearly above 75 °C and must be applied only for continuous DC leakage scenarios - not for transient suppression, where the 500 W peak pulse rating applies. Derating curves are provided to ensure safe operation at elevated ambient temperatures.
SA28HE3/54 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:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 28V
- Voltage - Breakdown (Min):
- 31.1V
- Voltage - Clamping (Max) @ Ipp:
- 50.1V
- Current - Peak Pulse (10/1000µs):
- 10A
- Power - Peak Pulse:
- 500W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-204AC (DO-15)
SA28HE3/54 FAQ
1.How can I place an order for SA28HE3/54 through Aetrix?
Please submit a Request for Quotation (RFQ) for SA28HE3/54 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 SA28HE3/54 reliable?
The price and inventory of SA28HE3/54 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA28HE3/54 is usually 5 days.
3.What payment methods are accepted for SA28HE3/54?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA28HE3/54 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA28HE3/54?
SA28HE3/54 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA28HE3/54 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 SA28HE3/54?
For technical support, including SA28HE3/54 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA28HE3/54 requirements.
6.How does Aetrix verify that SA28HE3/54 is sourced from the original manufacturer or authorized distributors?
All SA28HE3/54 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 SA28HE3/54 meets industry standards.
7.What is the process for return or replacement of SA28HE3/54?
All SA28HE3/54 units undergo pre-shipment inspection (PSI). If there is an issue with SA28HE3/54, 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 SA28HE3/54 part is unused and in its original packaging.
Return procedure for SA28HE3/54:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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