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Taiwan Semiconductor Corporation SA28CA
- Part No.:
- SA28CA
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA28CA.pdf
- Description:
- TVS DIODE 28VWM 59VC DO204AC
- Quantity:
- Payment:
- Shipping:
Inventory:7,253
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Product details
Overview
SA28CA from Taiwan Semiconductor is a bidirectional 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 maximum clamping voltage (VC) at 10A IPPM - used for ESD and surge protection in automotive lighting control modules.
For engineers reviewing the SA28CA datasheet, SA28CA pinout, SA28CA application, or SA28CA equivalent, key selection criteria include bidirectional clamping performance, AEC-Q101 qualification status, DO-15 mechanical compatibility, low leakage (<1μA @ 28V), and thermal derating behavior up to +175°C junction temperature.
Technical Context
The SA28CA operates as a bidirectional avalanche diode, symmetrically clamping transients above ±31.1V in both polarities. Its VBR tolerance (min/max) and temperature coefficient (35 mV/°C) are specified per ANSI/IEEE C62.35, ensuring predictable turn-on across automotive temperature ranges.
It delivers 10A peak pulse current (IPPM) at 10/1000μs waveform with 48.4V clamping, enabling robust protection of 24V CAN/LIN bus interfaces and microcontroller I/O lines against ISO 7637-2 pulse 1/2a/3a and IEC 61000-4-2 ESD events without forward conduction interference.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - Maximum continuous reverse voltage before clamping begins; matches 24V system rail with 15% margin. |
| VBR (min/max) | 31.1 / 38.0 V - Breakdown occurs within this range at 1 mA test current; defines clamping onset window. |
| VC @ IPPM | 48.4 V - Clamped voltage at 10 A peak pulse; limits protected circuit stress during 500W surge. |
| PPK | 500 W - Peak pulse power handling at 10/1000μs; meets ISO 7637-2 Pulse 5a severity level. |
| IR @ VWM | <1 μA - Reverse leakage at 28 V; ensures negligible standby current in always-on automotive nodes. |
| TJ max | +175 °C - Maximum junction temperature; supports under-hood placement near ECUs or lighting drivers. |
| Package | DO-204AC (DO-15) - Industry-standard axial leaded package with 0.400 g mass and UL 94V-0 molding compound. |
Pinout & Package
SA28CA is a two-terminal bidirectional TVS diode in DO-204AC (DO-15) package. It has no polarity marking; terminals are interchangeable. Leads are pure tin-plated and solderable per J-STD-002. Case meets UL 94V-0 flammability rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional avalanche junction | Both terminals function identically; no cathode band marking required for CA suffix parts. |
| Lead 1 / Lead 2 | Surge current path | Carry full 10A IPPM during clamping; require ≥10×10 mm copper pads per terminal for thermal dissipation. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive use per stress test requirements including HTOL, TC, HAST, and UHAST. |
| Fast response time | 5.0 ns typical from 0 V to VBR - enables protection against sub-microsecond ESD events (IEC 61000-4-2). |
| Low impedance surge path | Clamping ratio VC/VBR = 1.27 - minimizes overvoltage overshoot during fast-rising transients. |
| Halogen-free construction | Complies with IEC 61249-2-21 - supports RoHS-compliant and environmentally regulated vehicle production. |
| Whisker-resistant plating | Meets JESD 201 Class 2 - prevents tin whisker growth in long-life automotive applications. |
Applications
| Automotive LED Headlamp Driver Protection | 24V CAN Bus Node ESD Suppression |
|---|---|
Use Scenario: Protects MOSFET gate drivers and current-sense amplifiers in adaptive front-lighting systems exposed to load dump and inductive switching spikes. IC Role / Device Role / Timing Role: Bidirectional clamping device placed across power input rails and signal lines to limit transient voltage to <49 V. Use Value: Prevents latch-up or oxide damage in 3.3V/5V logic interfaces while surviving repeated 500W surges per ISO 7637-2. | Use Scenario: Installed on CAN_H/CAN_L differential pair near connector entry point in body control modules. IC Role / Device Role / Timing Role: Symmetric TVS that clamps common-mode transients without disrupting differential signaling integrity. Use Value: Maintains CAN bit timing stability by limiting common-mode voltage excursion to ≤48.4 V during EFT bursts (IEC 61000-4-4). |
| Industrial PLC Digital Input Protection | Smart Lighting Control System Surge Guard |
Use Scenario: Shields 24V digital input optocouplers and microcontroller GPIOs from field-wiring induced surges in factory automation cabinets. IC Role / Device Role / Timing Role: Standoff protector with 28V VWM ensures no conduction during normal operation; activates only during >31V transients. Use Value: Eliminates need for series current-limiting resistors while providing <1μA leakage - preserves input accuracy and power budget. | Use Scenario: Mounted across AC/DC converter output in DALI-enabled LED drivers to absorb switching noise and lightning-induced surges. IC Role / Device Role / Timing Role: Primary overvoltage clamp on secondary-side 24V DC bus, coordinated with upstream MOVs. Use Value: Enables compact design via DO-15 footprint and withstands 175°C ambient near heat-generating LED drivers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ28CA | Same VWM/VBR/VC specs but in SMB (DO-214AA) surface-mount package; 600W PPK rating. | Requires PCB re-layout for SMD mounting; better thermal performance at high ambient due to lower thermal resistance. | Select when board space is constrained and automated assembly is preferred over through-hole. |
| P6SMB28CA | Identical electrical specs and DO-214AA package; manufactured by Vishay; AEC-Q101 qualified variant available (P6SMB28CAHE3_A/H). | No functional difference in clamping behavior; differs only in branding, traceability, and qualification documentation scope. | Choose for dual-sourcing flexibility where Taiwan Semiconductor supply continuity is a concern. |
Compared with SA28CA, SMBJ28CA offers higher surge rating and SMT compatibility but requires layout change, while P6SMB28CA provides identical performance in an alternate qualified supply chain - both serve as drop-in functional alternatives only when package adaptation or sourcing diversification is prioritized.
Availability
SA28CA is available at Aetrix Electronics and suitable for automotive lighting systems, 24V CAN bus nodes, and industrial PLC digital inputs requiring stable component supply with AEC-Q101 assurance and DO-15 mechanical compatibility.
Supply support for SA28CA 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 designed specifically for automotive-grade transient suppression, emphasizing AEC-Q101 compliance, bidirectional symmetry, and high-temperature reliability in engine bay and lighting applications.
FAQ
What does the 'CA' suffix indicate in SA28CA?
The 'CA' suffix in SA28CA denotes a bidirectional configuration - meaning the device clamps transients equally in both polarities, with no cathode marking required. This distinguishes it from unidirectional variants (e.g., SA28A), which feature a cathode band and conduct only in reverse bias. SA28CA is intended for differential or AC-coupled protection where polarity is undefined or alternating.
Is SA28CA qualified to AEC-Q101?
Yes, SA28CA is AEC-Q101 qualified - confirmed in the SA Series datasheet (Version L2105) under FEATURES and ORDERING INFORMATION sections. The 'H' suffix (e.g., SA28CAH) explicitly denotes AEC-Q101 qualification, but the base SA28CA part is also covered under TSC's qualified SA Series family, meeting all stress tests including HTOL, temperature cycling, and unbiased HAST.
What is the maximum clamping voltage of SA28CA at its rated peak pulse current?
The maximum clamping voltage (VC) of SA28CA is 48.4 V at 10 A peak pulse current (IPPM), measured under the standard 10/1000μs double-exponential waveform. This value is guaranteed across the operating temperature range and defines the upper voltage limit imposed on protected circuits during worst-case surge events.
Can SA28CA be used in place of a unidirectional TVS like SA28A?
No - SA28CA cannot directly replace SA28A in unidirectional applications because SA28CA is bidirectional and lacks polarity marking, whereas SA28A is unidirectional with a defined cathode band and forward conduction capability. Substituting SA28CA for SA28A may cause unintended forward conduction in DC-biased circuits, risking latch-up or excessive leakage.
What is the thermal derating behavior of SA28CA above 25°C ambient?
SA28CA's peak pulse power (PPK) derates linearly above TA = 25°C, per Figure 2 in the datasheet: at 75°C ambient, PPK drops to ~70% of 500W (~350W); at 125°C, it falls to ~40% (~200W). Derating is based on junction temperature limits (TJ max = +175°C) and assumes standard mounting on 10×10 mm copper pads per lead.
SA28CA 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-204AC (DO-15)
SA28CA FAQ
1.How can I place an order for SA28CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SA28CA 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 SA28CA reliable?
The price and inventory of SA28CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA28CA is usually 5 days.
3.What payment methods are accepted for SA28CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA28CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA28CA?
SA28CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA28CA 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 SA28CA?
For technical support, including SA28CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA28CA requirements.
6.How does Aetrix verify that SA28CA is sourced from the original manufacturer or authorized distributors?
All SA28CA 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 SA28CA meets industry standards.
7.What is the process for return or replacement of SA28CA?
All SA28CA units undergo pre-shipment inspection (PSI). If there is an issue with SA28CA, 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 SA28CA part is unused and in its original packaging.
Return procedure for SA28CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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