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Taiwan Semiconductor Corporation SA28CAH
- Part No.:
- SA28CAH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA28CAH.pdf
- Description:
- TVS DIODE 28VWM 59VC DO204AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,123
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Product details
Overview
SA28CAH 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 - designed for automotive ESD and load-dump protection in power electronics.
For engineers reviewing the SA28CAH datasheet, SA28CAH pinout, SA28CAH application, or SA28CAH equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, clamping performance under standardized surge waveforms, thermal derating behavior, and direct alternatives for automotive-grade transient suppression.
Technical Context
The SA28CAH operates as a unidirectional avalanche diode, leveraging silicon p-n junction breakdown to clamp transients above its VBR threshold while maintaining low leakage (<1μA at 28V). Its 10/1000μs waveform rating reflects compliance with IEC 61000-4-5 Level 4 surge immunity testing.
Thermal design is constrained by a 175°C maximum junction temperature and 3W steady-state power dissipation on 10×10 mm copper pads; derating begins linearly above 25°C ambient per Fig.2, supporting operation across -55°C to +175°C junction range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - Maximum continuous reverse voltage before significant leakage; defines system operating margin below clamping onset |
| VBR min/max | 31.1 V / 38.0 V at 1 mA - Confirmed breakdown range ensures reliable turn-on during fast transients without premature conduction |
| VC @ IPPM | 48.4 V at 10 A - Clamping voltage limits downstream IC stress during 10/1000μs surges; critical for 3.3V/5V rail protection |
| PPK | 500 W - Peak pulse power handling per single 10/1000μs event; supports automotive load-dump and ISO 7637-2 Pulse 5a |
| IR @ VWM | <1 μA - Ultra-low reverse leakage preserves battery drain budgets in always-on automotive modules |
| TJ max | 175 °C - Enables under-hood deployment in engine control units and body electronics without thermal derating penalties |
Pinout & Package
SA28CAH 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 JESD 201 Class 2 whisker resistance. Weight: ~0.400 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current path / Ground reference | Connected to system ground or low-side return; completes clamping path during positive transients |
| Cathode | Protected line input / High-side connection | Connected to protected signal/power line; conducts avalanche current when line voltage exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, infotainment, and ADAS modules per stress test requirements |
| 500W 10/1000μs surge capability | Meets ISO 7637-2 Pulse 5a (load dump) and IEC 61000-4-5 surge immunity up to 4kV (line-to-ground) |
| Clamping voltage ≤48.4V at 10A | Ensures protected 24V systems remain within safe overvoltage margins during worst-case transients |
| Fast response time <1.0 ps | Turns on before most microcontroller I/O pins can be damaged by ESD or fast-rising spikes |
| RoHS & halogen-free | Complies with EU RoHS Directive 2011/65/EU and IEC 61249-2-21 for environmentally restricted materials |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC Digital Input Module |
|---|---|
Use Scenario: Protection of 24V sensor supply lines against load-dump transients during alternator regulation failure. IC Role / Device Role / Timing Role: Unidirectional TVS placed between 24V rail and ground to clamp surges up to 120V for <100ms duration. Use Value: Limits voltage seen by LDOs and microcontrollers to ≤48.4V, preventing latch-up or permanent damage per ISO 7637-2 Pulse 5a. | Use Scenario: Safeguarding 24V digital input channels from inductive kickback when switching solenoids or relays. IC Role / Device Role / Timing Role: Standoff-rated TVS absorbing repetitive 100–500A surge currents induced by coil de-energization. Use Value: Extends input circuit lifetime by diverting >95% of surge energy away from optocoupler inputs and series resistors. |
| LED Headlamp Driver Circuit | Automotive Infotainment Power Rail |
Use Scenario: Guarding constant-current LED driver ICs against ESD events and board-level fast transients during assembly or field operation. IC Role / Device Role / Timing Role: Low-capacitance unidirectional TVS on 12V input rail, responding in <1ps to sub-nanosecond ESD pulses. Use Value: Prevents gate oxide rupture in MOSFET drivers and latch-up in buck controller ICs during human-body-model (HBM) discharges. | Use Scenario: Securing 5V/3.3V power rails feeding audio processors and display controllers against conducted noise from CAN/LIN bus coupling. IC Role / Device Role / Timing Role: Secondary-stage TVS after bulk filtering, clamping coupled transients below IC absolute maximum ratings. Use Value: Maintains system uptime by avoiding brownouts or resets caused by 1–4kV fast transients entering via shared power distribution networks. |
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-HF | Same DO-204AC package, 28V VWM, but lower PPK (400W); clamping voltage 45.4V @ 9.8A | Limited to non-AEC-Q101 industrial use; lacks automotive qualification documentation | Select SMAJ28A-HF only for cost-sensitive non-automotive designs where 400W surge margin suffices |
| 1.5SMC28AH | DO-214AB (SMC) package, same 28V VWM, 500W rating, clamping 48.4V @ 10A; higher thermal mass | Requires PCB layout change due to SMC footprint; better for high-reliability industrial power supplies | Choose 1.5SMC28AH when board space allows larger package and higher thermal cycling endurance is required |
Compared with SMAJ28A-HF and 1.5SMC28AH, SA28CAH uniquely combines AEC-Q101 qualification, DO-204AC form factor, and full 500W surge rating - making it the only drop-in solution for space-constrained automotive ECUs requiring certified transient immunity.
Availability
SA28CAH is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLC input protection, LED lighting drivers, and infotainment power rail stabilization requiring stable component supply and long-term lifecycle assurance.
Supply support for SA28CAH 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 TVS diodes, rectifiers, and power devices since 1979.
The SA Series was developed specifically for automotive-grade transient suppression, emphasizing AEC-Q101 reliability, tight VBR tolerances, and robust 10/1000μs surge performance in legacy axial packages.
FAQ
What does the "H" suffix in SA28CAH signify?
The "H" suffix in SA28CAH indicates full AEC-Q101 qualification, confirming that the device has passed stress tests including high-temperature operating life, temperature cycling, and ESD per automotive standards. SA28CAH is not just compliant with AEC-Q101 - it is certified, enabling use in safety-critical automotive subsystems where SA28CAH must operate reliably over 15+ years.
Is SA28CAH unidirectional or bidirectional?
SA28CAH is a unidirectional TVS diode, as confirmed by its "CA" designation (C = unidirectional, A = tightened VBR tolerance) and cathode-band marking per DO-204AC mechanical drawing. It protects against positive transients on the cathode side relative to anode ground - unlike bidirectional variants such as SA28C, which lack the "A" and support symmetrical clamping.
What is the maximum clamping voltage of SA28CAH under standard test conditions?
The maximum clamping voltage of SA28CAH is 48.4 V at 10 A peak pulse current (IPPM) under the 10/1000μs waveform, per Table on Page 4 of the SA Series datasheet. This value is measured at TA = 25°C and defines the upper voltage limit imposed on protected circuits during worst-case surge events - a key parameter for verifying compatibility with downstream IC absolute maximum ratings in SA28CAH deployments.
Can SA28CAH replace SA28A in existing designs?
SA28CAH cannot directly replace SA28A without verification: although both share 28V VWM and DO-204AC packaging, SA28CAH is AEC-Q101 qualified and tested to automotive reliability standards, whereas SA28A is industrial-grade. SA28CAH also exhibits tighter VBR tolerance (31.1–38.0V vs. SA28A's 31.1–34.4V), affecting clamping consistency. Redesign validation is required before substituting SA28CAH into SA28A-based boards.
What is the junction capacitance of SA28CAH at operating bias?
SA28CAH does not specify junction capacitance (CJ) in its published datasheet - Figure 4 shows CJ curves for generic SA Series parts but omits numerical values for individual variants including SA28CAH. For high-frequency signal line protection, designers should consult TSC's application note AN-102 or measure CJ empirically at VR = 0 V and f = 1 MHz, as SA28CAH's capacitance is not characterized for RF or data-line applications.
SA28CAH 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:
- -
- Bidirectional Channels:
- 1
- 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)
SA28CAH FAQ
1.How can I place an order for SA28CAH through Aetrix?
Please submit a Request for Quotation (RFQ) for SA28CAH 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 SA28CAH reliable?
The price and inventory of SA28CAH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA28CAH is usually 5 days.
3.What payment methods are accepted for SA28CAH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA28CAH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA28CAH?
SA28CAH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA28CAH 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 SA28CAH?
For technical support, including SA28CAH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA28CAH requirements.
6.How does Aetrix verify that SA28CAH is sourced from the original manufacturer or authorized distributors?
All SA28CAH 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 SA28CAH meets industry standards.
7.What is the process for return or replacement of SA28CAH?
All SA28CAH units undergo pre-shipment inspection (PSI). If there is an issue with SA28CAH, 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 SA28CAH part is unused and in its original packaging.
Return procedure for SA28CAH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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