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Vishay General Semiconductor - Diodes Division SA28-E3/73
- Part No.:
- SA28-E3/73
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA28-E3/73.pdf
- Description:
- TVS DIODE 28VWM 50.1VC DO204AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,757
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Product details
Overview
SA28-E3/73 from Vishay General Semiconductor is a uni-directional Transient Voltage Suppressor (TVS) diode in DO-204AC (DO-15) package, designed for circuit protection against ESD and surge transients. It features a 28 V stand-off voltage (VWM), 31.1–34.4 V breakdown voltage (VBR) at 1 mA, 45.4 V clamping voltage (VC) at 11 A peak pulse current, and 500 W peak pulse power rating with 10/1000 μs waveform - deployed in power supply input stages and DC bus lines of industrial motor drives.
For engineers reviewing the SA28-E3/73 datasheet, SA28-E3/73 pinout, SA28-E3/73 application, or SA28-E3/73 equivalent, key selection criteria include clamping voltage margin relative to protected IC rail, unidirectional polarity alignment with DC bias, thermal derating above 25 °C, and AEC-Q101 qualification status for automotive-grade reliability validation.
Technical Context
This TVS operates as a voltage-clamped shunt protector: under normal operation it presents high impedance (<1 μA leakage at 28 V), but avalanches rapidly when reverse voltage exceeds VBR to divert transient energy away from downstream components. Its glass-passivated junction ensures stable breakdown characteristics and low incremental surge resistance.
The device complies with IEC 61000-4-2 (ESD) and IEC 61000-4-5 (surge) immunity requirements when applied with proper PCB layout - including short trace lengths, low-inductance grounding, and coordination with upstream fusing or current-limiting elements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - maximum continuous reverse operating voltage before significant leakage; sets upper limit for protected line's steady-state DC voltage |
| VBR min/max | 31.1 V / 34.4 V at 1 mA - guaranteed avalanche initiation range; determines minimum overvoltage threshold for clamping action |
| VC @ IPPM | 45.4 V at 11 A - maximum voltage seen by protected circuit during 10/1000 μs transient; must stay below downstream IC absolute max rating |
| PPPM | 500 W - peak transient power handling capability; defines survivability against standardized lightning/surge waveforms |
| IFSM | 70 A - non-repetitive forward surge current rating; relevant only if misapplied in forward bias during fault conditions |
| TJ max | +175 °C - maximum junction temperature; enables operation in high-ambient environments like engine compartments or enclosed power enclosures |
| Polarity | Uni-directional - requires correct orientation with cathode toward positive rail; color band denotes cathode terminal |
Pinout & Package
Package: DO-204AC (DO-15), axial-leaded, molded epoxy case meeting UL 94 V-0 flammability rating; matte tin-plated leads compliant with J-STD-002 and JESD 22-B102 solderability standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., ground or negative rail); conducts during forward faults or miswiring |
| Cathode | Reverse-biased clamping terminal | Marked with color band; connected to protected line; avalanches into conduction when reverse voltage exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated chip junction | Ensures stable, repeatable breakdown voltage and long-term reliability under thermal cycling and humidity stress |
| 500 W peak pulse power (10/1000 μs) | Supports robust protection against IEC 61000-4-5 Level 3 (1 kV/2 Ω) surges on 24 V industrial control lines |
| AEC-Q101 qualified | Validated for automotive applications requiring extended temperature operation and accelerated life testing per stress test conditions |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (e.g., inductive switch-off), improving clamping precision |
| Solder dip 275 °C max. for 10 s | Enables compatibility with standard lead-free reflow and wave soldering processes without parametric shift |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
Use Scenario: Protection of 24 V DC bus inputs against load dump and inductive kickback from solenoid valves and relay coils. IC Role / Device Role / Timing Role: Shunt-type transient suppressor placed directly across input terminals, clamping voltage spikes before they reach DC-DC converters and microcontrollers. Use Value: Limits transient voltage to ≤45.4 V, maintaining safe margin below 48 V-rated input stages of buck regulators and CAN transceivers. | Use Scenario: Input protection for LIN bus interface circuits and window lift motor drivers exposed to battery transients. IC Role / Device Role / Timing Role: Uni-directional TVS aligned with vehicle battery polarity, absorbing negative-going spikes during jump-start or alternator load dump events. Use Value: AEC-Q101 qualification ensures compliance with ISO 7637-2 Pulse 5a/b requirements for automotive electronics durability. |
| Telecom Power Supplies | Consumer Appliance Control Boards |
Use Scenario: Secondary-side overvoltage suppression on 48 V PoE-powered equipment front-end rectifiers. IC Role / Device Role / Timing Role: Standoff-rated TVS placed after bulk capacitor to clamp residual surges escaping primary-side protection. Use Value: 28 V VWM allows use on regulated 24 V auxiliary rails while providing headroom for ripple and tolerance drift. | Use Scenario: Surge protection on AC/DC adapter output lines feeding MCU-based washing machine or HVAC control logic. IC Role / Device Role / Timing Role: Low-leakage (≤1 μA at 28 V) shunt device preventing false resets or latch-up during ESD events on user interface wiring. Use Value: Fast response time and tight VBR tolerance reduce risk of damage to 3.3 V or 5 V LDOs and GPIO pins downstream. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ28A-E3/5T | Same VWM (28 V), identical DO-214AC package, slightly higher VC (48.4 V at 10.3 A), lower PPPM (400 W) | Surface-mount alternative for space-constrained designs; lacks AEC-Q101 qualification | Select SMAJ28A-E3/5T when board area is limited and automotive qualification is not required |
| 1.5KE28A | Higher PPPM (1500 W), larger DO-201AD package, same VWM/VBR range, no AEC-Q101 qualification | Used where higher surge energy absorption is needed (e.g., outdoor telecom cabinets), but incompatible with automated DO-15 placement | Choose 1.5KE28A for legacy through-hole designs needing >500 W surge capacity and no automotive compliance mandate |
Compared with SMAJ28A-E3/5T and 1.5KE28A, SA28-E3/73 offers AEC-Q101 qualification in a compact DO-15 axial package with optimized clamping performance for 24 V systems - making it preferred for automotive and industrial applications requiring both reliability and form-factor constraints.
Availability
SA28-E3/73 is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, telecom power supplies, and consumer appliance control boards requiring stable component supply and long-term lifecycle support.
Supply support for SA28-E3/73 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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and application-specific performance.
The SAxx series TVS diodes are engineered for robust transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where ESD, lightning, and inductive switching threats demand consistent clamping behavior and long-term stability.
FAQ
What is the clamping voltage of SA28-E3/73 and how does it protect downstream circuits?
The SA28-E3/73 has a maximum clamping voltage (VC) of 45.4 V at 11 A peak pulse current (10/1000 μs waveform). This means that during a transient event, the voltage across the protected line will not exceed 45.4 V, safeguarding downstream ICs rated for ≤48 V operation. Its low incremental surge resistance ensures minimal overshoot, preserving timing integrity in sensitive analog and digital circuits. The SA28-E3/73 achieves this while maintaining <1 μA leakage at its 28 V stand-off voltage under normal conditions.
Is SA28-E3/73 suitable for automotive applications?
Yes, SA28-E3/73 is AEC-Q101 qualified, confirming its suitability for automotive applications including body control modules, lighting drivers, and infotainment power supplies. It meets stress test requirements for temperature cycling, humidity, mechanical shock, and high-temperature operating life. Its DO-204AC package and uni-directional configuration align with common 12 V/24 V battery system protection schemes, and its 175 °C maximum junction temperature supports under-hood deployment. SA28-E3/73 is explicitly listed in Vishay's AEC-Q101 qualified devices table.
How does the SA28-E3/73 differ from bi-directional TVS diodes like SA28CA?
The SA28-E3/73 is a uni-directional TVS diode, meaning it conducts only in reverse bias above its breakdown voltage and blocks forward current up to 3.5 V at 100 A. In contrast, SA28CA is bi-directional and symmetrical - clamping transients of either polarity, making it suitable for AC lines or differential signal protection. SA28-E3/73's uni-directional nature provides tighter leakage control (<1 μA at 28 V) and better forward surge capability (70 A IFSM), whereas SA28CA exhibits matched VBR in both directions but higher leakage in DC-biased applications. The SA28-E3/73 must be installed with correct polarity (cathode to positive rail).
What is the thermal derating behavior of SA28-E3/73 above 25 °C ambient?
SA28-E3/73 follows Vishay's standard derating curve: its peak pulse power (PPPM) remains at 500 W up to 25 °C ambient, then linearly decreases to ~300 W at 75 °C and ~150 W at 125 °C. Steady-state power dissipation (PD) drops from 3.0 W at TL = 75 °C to zero at TL = 175 °C, per Figure 5 in the datasheet. Designers must ensure adequate PCB copper area and airflow to maintain lead temperature (TL) ≤75 °C for full power rating utilization. The SA28-E3/73's 175 °C TJ max allows operation in high-ambient enclosures when properly heatsinked.
Can SA28-E3/73 be used in parallel for higher surge current handling?
No, SA28-E3/73 should not be paralleled without external balancing components. Due to manufacturing tolerances in VBR (31.1–34.4 V), mismatched avalanche turn-on can cause one device to absorb most of the surge current, leading to premature failure. Vishay does not recommend direct parallel connection for increased IPPM. Instead, select a single higher-rated device (e.g., SA33A or SA36A) or implement discrete current-sharing resistors - though this adds voltage drop and reduces clamping effectiveness. For mission-critical systems, verify layout and transient distribution via SPICE simulation before committing to parallel SA28-E3/73 units.
SA28-E3/73 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-204AC, DO-15, Axial
- Series:
- TransZorb®
- Packaging:
- Tape & Box (TB)
- 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-204AC (DO-15)
SA28-E3/73 FAQ
1.How can I place an order for SA28-E3/73 through Aetrix?
Please submit a Request for Quotation (RFQ) for SA28-E3/73 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 SA28-E3/73 reliable?
The price and inventory of SA28-E3/73 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA28-E3/73 is usually 5 days.
3.What payment methods are accepted for SA28-E3/73?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA28-E3/73 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA28-E3/73?
SA28-E3/73 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA28-E3/73 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 SA28-E3/73?
For technical support, including SA28-E3/73 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA28-E3/73 requirements.
6.How does Aetrix verify that SA28-E3/73 is sourced from the original manufacturer or authorized distributors?
All SA28-E3/73 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 SA28-E3/73 meets industry standards.
7.What is the process for return or replacement of SA28-E3/73?
All SA28-E3/73 units undergo pre-shipment inspection (PSI). If there is an issue with SA28-E3/73, 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 SA28-E3/73 part is unused and in its original packaging.
Return procedure for SA28-E3/73:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SA28-E3/73 Tags
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