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Taiwan Semiconductor Corporation SA28AH
- Part No.:
- SA28AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA28AH.pdf
- Description:
- TVS DIODE 28VWM 59VC DO204AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,149
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Product details
Overview
SA28AH from Taiwan Semiconductor is a unidirectional AEC-Q101-qualified 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), and 48.4V clamping voltage (VC) at 10A peak pulse current - deployed for automotive ESD and load-dump protection in engine control units.
For engineers reviewing the SA28AH datasheet, SA28AH pinout, SA28AH application, or SA28AH equivalent, key selection criteria include its AEC-Q101 qualification, unidirectional polarity, 175°C max junction temperature, low 1μA reverse leakage at 28V, and DO-15 mechanical compatibility with legacy through-hole PCB layouts.
Technical Context
The SA28AH operates as a silicon avalanche diode optimized for fast transient suppression in automotive power rails. Its unidirectional configuration enables robust anode-to-cathode surge conduction while maintaining tight VWM/VBR tolerance (±11%) and low dynamic impedance under 10/1000μs surges.
It delivers sub-nanosecond response (<1.0ps from 0V to VBR), supports 70A non-repetitive forward surge (8.3ms half-sine), and sustains steady-state power dissipation of 3W at TL = 75°C on 10×10 mm copper pads - meeting IEC 61000-4-2/4-4/4-5 and ISO 7637-2 requirements when properly mounted.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - maximum continuous DC or RMS voltage the device blocks without clamping |
| VBR min/max | 31.1 V / 38.0 V at 1 mA - ensures reliable avalanche initiation within defined tolerance band |
| VC @ IPPM | 48.4 V at 10 A - limits downstream voltage stress during 10/1000μs transients |
| PPK | 500 W - peak surge power handling per single 10/1000μs pulse |
| IR @ VWM | <1 μA - minimal leakage current preserves system standby power integrity |
| TJ max | +175 °C - enables operation in under-hood automotive environments |
| Package | DO-204AC (DO-15) - industry-standard through-hole package with tin-plated leads |
Pinout & Package
DO-204AC (DO-15) package with axial leads: cathode indicated by band marking; anode and cathode terminals support unidirectional surge conduction only.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Surge current entry point (for reverse-biased operation) | Connected to protected line; conducts surge current toward cathode during overvoltage event |
| Cathode | Surge current exit point (marked with band) | Connected to ground or low-impedance return path; defines polarity and clamping reference |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per JESD47 |
| Fast response time | <1.0 ps rise time from 0 V to VBR enables suppression before sensitive ICs experience overstress |
| Low clamping ratio | VC/VBR ≈ 1.32 - minimizes voltage overshoot relative to breakdown threshold |
| Halogen-free & RoHS | Complies with IEC 61249-2-21 and EU RoHS Directive 2011/65/EU for eco-conscious manufacturing |
| UL 94V-0 molding | Flame-retardant epoxy compound prevents fire propagation in high-energy fault conditions |
Applications
| Engine Control Unit (ECU) Power Rail Protection | Automotive Lighting Driver Input Protection |
|---|---|
Use Scenario: Protects 12V supply input of engine control unit against ISO 7637-2 Pulse 1 (inductive load dump) and Pulse 3a/b (switching transients). IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and LDO/regulator input to clamp transients below IC absolute maximum ratings. Use Value: With 48.4V clamping at 10A and 175°C rating, SA28AH prevents latch-up or damage to MCU power management circuitry during cold-crank and load-dump events. | Use Scenario: Shields LED driver IC inputs from ESD events (IEC 61000-4-2 ±15kV contact) and relay-switching spikes in headlamp modules. IC Role / Device Role / Timing Role: Mounted at connector interface to absorb fast-rising transients before they propagate into current-sense amplifiers or PWM controllers. Use Value: Sub-1ps response and 1μA leakage at 28V ensure signal integrity is preserved while enabling fail-safe operation in harsh lighting environments. |
| Body Control Module (BCM) LIN Bus Line Protection | Start-Stop System Battery Monitoring Circuit Protection |
Use Scenario: Safeguards LIN transceiver pins against electrical fast transients (EFT) per IEC 61000-4-4 (±2kV burst) induced by nearby solenoid actuation. IC Role / Device Role / Timing Role: Placed in series with LIN bus line to limit voltage excursions without distorting 19.2 kbps signaling waveform. Use Value: Low capacitance (typ. <100 pF at 0 V) and precise 28V VWM prevent signal attenuation while maintaining bus timing margins. | Use Scenario: Protects fuel pump controller's battery voltage sensing node from transients during alternator regulation faults or jump-start conditions. IC Role / Device Role / Timing Role: Connected across sense resistor network to clamp overvoltage before ADC input or comparator stage. Use Value: Tight VBR tolerance (31.1–38.0V) and 175°C TJ rating ensure stable sensing accuracy across full vehicle thermal operating range. |
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 DO-214AC package; 28V VWM, but bidirectional; 400W PPK rating | Not AEC-Q101 qualified; lower surge rating limits use in critical automotive power rails | Select SMAJ28A only for cost-sensitive industrial applications where AEC-Q101 is not mandated |
| P6SMB28AH | DO-214AA package; 28V VWM; AEC-Q101 qualified; 600W PPK; higher IPPM (17.3A) | Surface-mount format requires PCB redesign; superior surge margin for high-risk zones like alternator output | Choose P6SMB28AH when upgrading to SMT layout or requiring >500W surge headroom |
Compared with SMAJ28A and P6SMB28AH, SA28AH uniquely combines AEC-Q101 compliance, through-hole DO-15 mounting, and exact 500W/10/1000μs capability - making it optimal for legacy automotive PCBs needing drop-in replacement without layout change or qualification revalidation.
Availability
SA28AH is available at Aetrix Electronics and suitable for automotive ECU protection, body control module hardening, and start-stop system voltage monitoring requiring stable component supply across extended temperature and lifecycle demands.
Supply support for SA28AH 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 analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, specializing in power management, protection, and signal conditioning devices.
The SA Series TVS diodes are engineered specifically for automotive-grade transient suppression, emphasizing AEC-Q101 reliability, high-temperature operation, and consistent clamping performance across mass-production lots.
FAQ
What does the "H" suffix in SA28AH signify?
The "H" suffix in SA28AH indicates full AEC-Q101 qualification per revision D, covering stress tests including high-temperature reverse bias (HTRB), temperature cycling (TC), and ESD (HBM/MM). This certification confirms SA28AH meets automotive electronic component reliability standards for under-hood deployment, unlike standard SA28A variants.
Is SA28AH unidirectional or bidirectional?
SA28AH is a unidirectional TVS diode, designed to clamp only reverse-biased transients - meaning it conducts surge current from cathode to anode when the cathode voltage exceeds the anode by more than VBR. Its polarity is marked by a cathode band, and it must be installed with correct orientation relative to the protected line and ground.
What is the maximum clamping voltage of SA28AH and at what test condition?
The maximum clamping voltage (VC) of SA28AH is 48.4 V, measured at a peak pulse current (IPPM) of 10 A using the standardized 10/1000 μs double-exponential waveform. This value is guaranteed across the full operating temperature range and defines the upper voltage limit imposed on protected circuitry during surge events.
Can SA28AH replace SA28A in existing designs?
Yes, SA28AH is a direct form-fit-function replacement for SA28A, sharing identical DO-204AC (DO-15) package dimensions, pinout, and electrical specifications - except SA28AH adds AEC-Q101 qualification. No PCB or schematic changes are required; however, qualification documentation must be updated to reflect the enhanced automotive reliability status of SA28AH.
What is the junction temperature rating and why does it matter for SA28AH?
SA28AH has a maximum junction temperature (TJ) rating of +175°C, enabling reliable operation in high-ambient under-hood environments such as near engines or exhaust systems. This rating directly impacts long-term reliability: exceeding TJ max accelerates parametric drift and reduces surge endurance, so thermal design - including pad size and airflow - must maintain junction temperature within this limit during worst-case transients.
SA28AH 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:
- 59V
- Current - Peak Pulse (10/1000µs):
- 11.5A
- 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)
SA28AH FAQ
1.How can I place an order for SA28AH through Aetrix?
Please submit a Request for Quotation (RFQ) for SA28AH 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 SA28AH reliable?
The price and inventory of SA28AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA28AH is usually 5 days.
3.What payment methods are accepted for SA28AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA28AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA28AH?
SA28AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA28AH 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 SA28AH?
For technical support, including SA28AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA28AH requirements.
6.How does Aetrix verify that SA28AH is sourced from the original manufacturer or authorized distributors?
All SA28AH 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 SA28AH meets industry standards.
7.What is the process for return or replacement of SA28AH?
All SA28AH units undergo pre-shipment inspection (PSI). If there is an issue with SA28AH, 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 SA28AH part is unused and in its original packaging.
Return procedure for SA28AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SA28AH Tags
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