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Vishay General Semiconductor - Diodes Division SA28HE3/73
- Part No.:
- SA28HE3/73
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA28HE3/73.pdf
- Description:
- TVS DIODE 28VWM 50.1VC DO204AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,013
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Product details
Overview
SA28HE3/73 from Vishay General Semiconductor is a uni-directional Transient Voltage Suppressor (TVS) diode in DO-204AC (DO-15) package, rated for 28 V stand-off voltage (VWM), 31.1–34.4 V breakdown voltage (VBR), 500 W peak pulse power (10/1000 µs), and 11 A peak pulse current (IPPM). It protects MOSFETs and signal lines in automotive powertrain control modules against inductive switching transients.
For engineers reviewing the SA28HE3/73 datasheet, SA28HE3/73 pinout, SA28HE3/73 application, or SA28HE3/73 equivalent, this AEC-Q101 qualified TVS offers verified clamping performance at 45.4 V (VC) under 11 A surge, low incremental surge resistance, and RoHS-compliant matte tin-plated leads suitable for J-STD-002 soldering.
Technical Context
This device operates as a uni-directional avalanche diode with glass-passivated junction, designed to clamp transient overvoltages before they damage downstream ICs or power switches. Its 175 °C maximum junction temperature and 70 A IFSM rating support robust operation in engine control units and industrial motor drives.
The SA28HE3/73 exhibits a 31.1–34.4 V breakdown range at 10 mA test current, with 28 V nominal stand-off voltage and 45.4 V maximum clamping voltage at 11 A - enabling precise coordination with 3.3 V/5 V/12 V rail protection schemes without false triggering during normal operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - Maximum continuous reverse operating voltage before clamping begins; sets system-level overvoltage trip threshold. |
| VBR (min/max) | 31.1 V / 34.4 V at 10 mA - Confirmed avalanche onset range; ensures reliable turn-on above normal rail tolerances. |
| VC @ IPPM | 45.4 V at 11 A - Clamped voltage during 10/1000 µs surge; defines worst-case stress on protected circuitry. |
| PPPM | 500 W - Peak pulse power handling per 10/1000 µs waveform; supports repetitive ESD and load-dump immunity. |
| IFSM | 70 A - Non-repetitive forward surge current rating (10 ms half-sine); validates robustness against battery reversal or polarity faults. |
| TJ max | 175 °C - Maximum junction temperature; enables deployment in under-hood automotive environments without derating. |
| Leakage (ID) | 1.0 µA at 28 V - Ultra-low reverse leakage preserves signal integrity and minimizes standby power loss. |
Pinout & Package
SA28HE3/73 uses the DO-204AC (DO-15) axial-leaded package: molded epoxy body with matte tin-plated leads, 0.104–0.140 inch diameter, 1.0 inch minimum lead length, compliant with UL 94 V-0 flammability rating. Polarity is marked by cathode band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to ground or lower-potential node in uni-directional clamping configuration. |
| Cathode (banded end) | Avalanche clamping terminal | Connected to protected line (e.g., 28 V supply rail); conducts during positive transients to shunt energy to ground. |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated chip junction | Ensures stable VBR tolerance and long-term reliability under thermal cycling in automotive applications. |
| AEC-Q101 qualification | Validates suitability for automotive powertrain and chassis systems requiring zero-failure field performance. |
| 500 W peak pulse power (10/1000 µs) | Withstands ISO 7637-2 Pulse 1, 2a, 3a/b, and SAE J1113-11 load-dump surges without degradation. |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients (<1 ns response), improving protection margin for sensitive gate drivers. |
| RoHS-compliant, matte tin plating | Meets J-STD-002 solderability requirements and JESD 201 Class 2 whisker resistance for high-reliability assembly. |
Applications
| Automotive Engine Control Unit (ECU) | Industrial Motor Drive Power Stage |
|---|---|
Use Scenario: Protects microcontroller I/O and CAN transceiver power rails from alternator load-dump spikes and relay coil flyback. IC Role / Device Role / Timing Role: Uni-directional clamping element placed between 12 V supply and ground, triggered only during positive overvoltage events. Use Value: Limits transient voltage to ≤45.4 V, preventing latch-up or oxide breakdown in 3.3 V logic interfaces downstream of LDO regulators. | Use Scenario: Shields gate drivers and current-sense amplifiers from inductive kickback during IGBT switching in HVAC compressors. IC Role / Device Role / Timing Role: Fast-response voltage clamp across DC bus or gate drive supply, activated within nanoseconds of voltage excursion. Use Value: Maintains <1.0 µA leakage at 28 V, eliminating drift in precision current feedback paths during steady-state operation. |
| Telecom Base Station Power Supply | Consumer Appliance Mainboard Protection |
Use Scenario: Safeguards 28 V bias rails feeding RF power amplifiers against lightning-induced surges on AC input lines. IC Role / Device Role / Timing Role: Primary overvoltage suppression device in multi-stage protection architecture, upstream of polymer PTC and ceramic capacitors. Use Value: Delivers 500 W pulse handling with 45.4 V clamping, reducing secondary protector stress and extending system MTBF. | Use Scenario: Guards microcontroller reset and communication lines in washing machine mainboards exposed to solenoid valve switching noise. IC Role / Device Role / Timing Role: Low-capacitance (typ. <100 pF) TVS placed directly at connector entry point to suppress 8/20 µs surges. Use Value: Enables compliance with IEC 61000-4-5 Level 3 (2 kV line-to-ground) without adding signal distortion or timing skew. |
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-E3/5A | Same VWM (28 V), but SMA package (surface-mount); 400 W PPPM; 10.5 A IPPM; 45.4 V VC. | Requires PCB rework for SMT layout; lacks AEC-Q101 qualification; suited for space-constrained consumer designs. | Select when board real estate is limited and automotive qualification is not required. |
| 1.5KE28A | Same DO-15 package; higher PPPM (1500 W); 31.1–34.4 V VBR; 43.0 V VC at 35 A; no AEC-Q101 rating. | Higher surge capacity but larger VC margin mismatch; used in industrial UPS where cost > qualification priority. | Select when legacy through-hole compatibility is critical and AEC-Q101 is optional. |
Compared with SMAJ28A-E3/5A and 1.5KE28A, SA28HE3/73 uniquely combines AEC-Q101 qualification, DO-204AC axial form factor, and precisely matched 45.4 V clamping for automotive 28 V systems - making it the preferred choice where reliability, regulatory compliance, and mechanical mounting consistency are non-negotiable.
Availability
SA28HE3/73 is available at Aetrix Electronics and suitable for automotive engine control units, industrial motor drives, telecom base station power supplies, and consumer appliance mainboards requiring stable component supply across extended production lifecycles.
Supply support for SA28HE3/73 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, rectifiers, and protection devices with emphasis on automotive-grade reliability and AEC-Q101 validation.
The SAxxA series was developed specifically for robust transient suppression in 12 V and 24 V automotive and industrial power systems, targeting high-temperature under-hood and factory-floor environments.
FAQ
What is the clamping voltage of SA28HE3/73 at its rated peak pulse current?
The SA28HE3/73 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 per JEDEC test conditions and defines the upper voltage limit imposed on protected circuits during surge events. The SA28HE3/73 maintains this clamping performance consistently across its qualified temperature range (-55 °C to +175 °C).
Is SA28HE3/73 suitable for automotive applications?
Yes, SA28HE3/73 is AEC-Q101 qualified and explicitly rated for automotive use, including engine control units and body electronics. Its DO-204AC package meets JESD 201 Class 2 whisker resistance, and its 175 °C maximum junction temperature supports under-hood deployment. The SA28HE3/73 datasheet confirms qualification per AEC-Q101 Rev G, with full temperature cycling, humidity, and mechanical shock validation.
What is the reverse leakage current of SA28HE3/73 at its stand-off voltage?
The SA28HE3/73 exhibits a maximum reverse leakage current (ID) of 1.0 µA at its rated stand-off voltage of 28 V and ambient temperature of 25 °C. This ultra-low leakage ensures minimal power loss in always-on circuits and prevents false triggering in high-impedance sensor interfaces. Leakage remains below 5 µA up to 125 °C per Vishay's derating curves.
Does SA28HE3/73 have a bi-directional variant?
No, SA28HE3/73 is strictly a uni-directional TVS diode, indicated by the "A" suffix. Bi-directional variants in the same family use the "CA" suffix (e.g., SA28CA). The SA28HE3/73 features a cathode band marking and must be oriented with cathode toward the protected line; it does not conduct in reverse bias beyond its specified leakage.
What packaging and plating does SA28HE3/73 use?
SA28HE3/73 uses the DO-204AC (DO-15) axial-leaded package with matte tin-plated leads, compliant with J-STD-002 solderability and JESD 201 Class 2 whisker resistance. The "HE3" suffix denotes AEC-Q101 qualification and RoHS compliance. Lead finish passes 275 °C solder dip for 10 seconds per JESD 22-B106, ensuring robust assembly yield in wave and selective soldering processes.
SA28HE3/73 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:
- -
- 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)
SA28HE3/73 FAQ
1.How can I place an order for SA28HE3/73 through Aetrix?
Please submit a Request for Quotation (RFQ) for SA28HE3/73 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 SA28HE3/73 reliable?
The price and inventory of SA28HE3/73 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA28HE3/73 is usually 5 days.
3.What payment methods are accepted for SA28HE3/73?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA28HE3/73 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA28HE3/73?
SA28HE3/73 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA28HE3/73 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 SA28HE3/73?
For technical support, including SA28HE3/73 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA28HE3/73 requirements.
6.How does Aetrix verify that SA28HE3/73 is sourced from the original manufacturer or authorized distributors?
All SA28HE3/73 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 SA28HE3/73 meets industry standards.
7.What is the process for return or replacement of SA28HE3/73?
All SA28HE3/73 units undergo pre-shipment inspection (PSI). If there is an issue with SA28HE3/73, 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 SA28HE3/73 part is unused and in its original packaging.
Return procedure for SA28HE3/73:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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