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Taiwan Semiconductor Corporation SA28H
- Part No.:
- SA28H
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA28H.pdf
- Description:
- 500W, 34.6V, 10%, UNIDIRECTIONAL
- Quantity:
- Payment:
- Shipping:
Inventory:5,264
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Product details
Overview
SA28H from Taiwan Semiconductor is an AEC-Q101 qualified unidirectional transient voltage suppressor (TVS) diode in DO-204AC (DO-15) package, rated for 500W peak pulse power at 10/1000μs, with 28V working stand-off voltage (VWM), 31.1–38.0V breakdown voltage (VBR @ 1mA), and 48.4V maximum clamping voltage (VC) at 10A peak pulse current - deployed for automotive ESD and load-dump protection in engine control units and body electronics.
For engineers reviewing the SA28H datasheet, SA28H pinout, SA28H application, or SA28H equivalent, this page delivers verified electrical parameters, clamping behavior under surge conditions, thermal derating curves, AEC-Q101 qualification status, and direct alternatives for automotive-grade transient suppression where low-leakage (<1μA @ 28V), fast response (<1ps), and 175°C junction operation are required.
Technical Context
The SA28H operates as a unidirectional avalanche diode, triggering when reverse voltage exceeds its VBR range (31.1–38.0V) to clamp transients while maintaining <1μA leakage at 28V. Its 48.4V clamping voltage at 10A IPPM ensures downstream ICs see limited overvoltage during ISO 7637-2 pulse 1/2a/5a events.
Designed for automotive environments, it sustains 175°C maximum junction temperature, supports 70A non-repetitive forward surge (8.3ms half-sine), and meets JESD201 Class 2 whisker resistance and RoHS/halogen-free requirements - all validated per AEC-Q101 stress test conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - Maximum continuous reverse operating voltage before conduction begins; defines system-level DC bus compatibility. |
| VBR @ 1mA | 31.1–38.0 V - Breakdown voltage tolerance band; determines precise turn-on threshold under standardized test current. |
| VC @ 10A | 48.4 V - Clamped voltage during 10A 10/1000μs surge; sets worst-case overvoltage seen by protected circuitry. |
| PPK | 500 W - Peak pulse power rating at TA = 25°C; quantifies single-event surge energy handling capability. |
| IR @ VWM | <1 μA - Reverse leakage at 28V; ensures minimal standby power loss and signal integrity in high-impedance nodes. |
| TJ MAX | +175 °C - Maximum junction temperature; enables placement near heat sources in under-hood automotive modules. |
| Response Time | <1.0 ps - Time from 0V to VBR under fast-rising transients; critical for protecting high-speed CAN/LIN interfaces. |
Pinout & Package
SA28H uses the DO-204AC (DO-15) axial leaded package with cathode band marking. Leads are pure tin-plated, solderable per J-STD-002, and meet UL 94V-0 flammability rating. Weight is approximately 0.400g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unmarked end) | Forward current path / ground reference | Connected to system ground or low-side return; carries surge current during clamping. |
| Cathode (banded end) | Reverse-biased transient input node | Connected to protected line (e.g., 12V supply rail); avalanche conduction initiates here during overvoltage. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive use across temperature, humidity, mechanical shock, and lifetime reliability tests - required for ECU, ADAS, and body control modules. |
| 500W 10/1000μs surge rating | Withstands ISO 7637-2 Pulse 5a (load dump) up to 100V/500W without degradation - eliminates need for external series impedance in many 12V systems. |
| <1μA leakage @ 28V | Enables use on always-on battery rails (e.g., CAN wake-up lines) without measurable quiescent current penalty or false wake-ups. |
| DO-204AC (DO-15) package | Industry-standard axial footprint compatible with legacy through-hole assembly and automated tape-and-reel feeding (3500/reel). |
| 175°C max junction temperature | Supports mounting directly on PCBs near power MOSFETs or regulators in engine compartment applications without thermal derating penalties. |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC Digital Input Module |
|---|---|
Use Scenario: Protection of 12V supply rail against alternator load dump and inductive switching spikes during solenoid de-energization. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between battery rail and LDO input, clamping transients within 1ps to limit voltage excursion to ≤48.4V. Use Value: Prevents latch-up or permanent damage to microcontroller power domains and analog sensor front-ends exposed to >100V surges. |
Use Scenario: Safeguarding 24V digital input optocouplers from field-wiring induced EFT bursts and lightning-induced surges. IC Role / Device Role / Timing Role: Standoff-rated TVS on input terminal block, conducting only during >31.1V transients while remaining invisible to 24V logic thresholds. Use Value: Maintains IEC 61000-4-4 Level 4 immunity (4kV EFT) without signal distortion or false triggering during normal operation. |
| Automotive Body Control Module (BCM) | LED Lighting Driver Power Stage |
Use Scenario: Shielding LIN bus transceivers and window motor drivers from battery disconnect transients and relay coil flyback. IC Role / Device Role / Timing Role: Unidirectional clamping device on VBAT-supplied IC rails, leveraging sub-1ps response to suppress nanosecond-scale spikes. Use Value: Eliminates need for RC snubbers or additional filtering, reducing BOM count and PCB area in space-constrained BCM designs. |
Use Scenario: Protecting buck controller ICs and MOSFET gates from voltage overshoot during LED string short-circuit events. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 24–48V input stage, activated before internal FET avalanche limits are exceeded. Use Value: Extends system MTBF by preventing gate oxide rupture and controller latch-up during fault conditions. |
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-H | Same DO-214AC package; bidirectional; VBR = 31.1–34.4V; VC = 45.4V @ 10.2A; lower clamping but no polarity sensitivity. | Used where bidirectional protection is needed (e.g., data lines), not suitable for unidirectional DC rails requiring cathode-ground orientation. | Select SMAJ28A-H only if circuit lacks defined polarity or requires symmetrical clamping; SA28H provides tighter VBR tolerance and AEC-Q101 traceability. |
| P6SMB28AH | DO-214AA package; unidirectional; VBR = 31.1–34.4V; VC = 45.4V @ 10.2A; same power rating but different thermal profile due to smaller case. | Preferred for space-constrained layouts; lower thermal mass reduces sustained surge capability above 25°C ambient. | Choose P6SMB28AH for compact SMT designs; SA28H offers superior thermal robustness in through-hole automotive harness connections. |
Compared with SMAJ28A-H and P6SMB28AH, SA28H delivers AEC-Q101 certification, DO-204AC mechanical ruggedness for wire-harness interfaces, and verified 175°C operation - making it the preferred choice for under-hood automotive power rail protection where reliability under thermal cycling and vibration is non-negotiable.
Availability
SA28H is available at Aetrix Electronics and suitable for automotive ECUs, industrial PLCs, LED lighting drivers, and body control modules requiring stable component supply with full AEC-Q101 compliance and long-term lifecycle support.
Supply support for SA28H 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
Taiwan Semiconductor Corporation (TSC) is a vertically integrated semiconductor manufacturer specializing in discrete power devices, TVS diodes, rectifiers, and automotive-qualified components since 1979.
The SA Series was developed specifically for AEC-Q101-compliant transient suppression in 12V/24V automotive and industrial power systems - emphasizing low clamping, high surge robustness, and long-term reliability under thermal and mechanical stress.
FAQ
What is the AEC-Q101 qualification status of SA28H?
The SA28H is explicitly AEC-Q101 qualified per the manufacturer's ordering code suffix "H" and documentation (Version L2105). This includes stress testing for temperature cycling, high-temperature operating life, unbiased high-humidity accelerated stress, and mechanical shock - confirming suitability for automotive powertrain and chassis applications. SA28H maintains full specification compliance throughout the -55°C to +175°C junction temperature range.
Does SA28H support bidirectional transient suppression?
No, SA28H is a unidirectional TVS diode, indicated by its single cathode band marking and specified VBR/VC parameters for reverse-bias operation only. It must be installed with cathode toward the protected line and anode to ground. For bidirectional protection, TSC offers the SA28A variant - which shares the same VWM and clamping but conducts in both polarities.
What is the maximum clamping voltage of SA28H under standard surge conditions?
The SA28H has a maximum clamping voltage (VC) of 48.4 V at 10 A peak pulse current (IPPM) under the 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during a standardized surge event - critical for ensuring downstream ICs remain within absolute maximum ratings.
Can SA28H replace SA28 in an existing design?
Yes, SA28H is a drop-in replacement for SA28 with identical electrical specifications and DO-204AC packaging, differing only in AEC-Q101 qualification and enhanced process controls. No PCB or schematic changes are required; however, SA28H adds automotive-grade reliability validation, including whisker resistance and extended temperature cycling data - recommended for new automotive designs.
What is the thermal derating behavior of SA28H above 25°C ambient?
SA28H follows the standard pulse derating curve (Fig.2 in datasheet L2105): peak pulse power decreases linearly from 500W at 25°C to ~250W at 100°C ambient. At 125°C, it retains ~125W capability. This derating applies to non-repetitive pulses; steady-state power dissipation remains 3W at TL = 75°C with 9.5mm lead lengths mounted on 10×10 mm copper pads.
SA28H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-204AC, DO-15, Axial
- Series:
- SA
- 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:
- 48.4V
- 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)
SA28H FAQ
1.How can I place an order for SA28H through Aetrix?
Please submit a Request for Quotation (RFQ) for SA28H 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 SA28H reliable?
The price and inventory of SA28H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA28H is usually 5 days.
3.What payment methods are accepted for SA28H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA28H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA28H?
SA28H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA28H 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 SA28H?
For technical support, including SA28H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA28H requirements.
6.How does Aetrix verify that SA28H is sourced from the original manufacturer or authorized distributors?
All SA28H 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 SA28H meets industry standards.
7.What is the process for return or replacement of SA28H?
All SA28H units undergo pre-shipment inspection (PSI). If there is an issue with SA28H, 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 SA28H part is unused and in its original packaging.
Return procedure for SA28H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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