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Taiwan Semiconductor Corporation SA28C
- Part No.:
- SA28C
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA28C.pdf
- Description:
- 500W, 34.6V, 10%, BIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:4,224
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Product details
Overview
SA28C from Taiwan Semiconductor is a 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 clamping voltage (VC) at 10A peak pulse current - used to protect automotive power rails and industrial control inputs against ESD and load dump transients.
For engineers reviewing the SA28C datasheet, SA28C pinout, SA28C application, or SA28C equivalent, key selection criteria include unidirectional polarity, DO-15 mechanical compatibility, 175°C junction temperature rating, low leakage (<1μA @ 28V), and AEC-Q101 qualification status where specified.
Technical Context
The SA28C operates as a silicon avalanche diode optimized for fast clamping of high-energy transients. Its unidirectional configuration provides forward conduction path during overvoltage events while maintaining <1μA reverse leakage at VWM = 28V and exhibiting a typical response time of <1.0ps from 0V to VBR.
It complies with ANSI/IEEE C62.35 surge waveform standards, supports 70A non-repetitive forward surge current (IFSM), and is rated for operation across –55°C to +175°C junction temperature range - enabling use in under-hood automotive and industrial environments where thermal robustness is critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 31.1 / 38.0 V @ 1 mA - ensures reliable avalanche initiation within defined tolerance band |
| VC @ IPPM | 48.4 V @ 10 A - limits downstream voltage stress during 10/1000μs surge events |
| PPK | 500 W - peak pulse power handling capability per 10/1000μs waveform |
| IR @ VWM | <1 μA - minimal standby power loss and signal integrity impact in high-impedance circuits |
| TJ max | +175 °C - enables deployment in high-temperature engine compartment or industrial enclosures |
| Package | DO-204AC (DO-15) - industry-standard axial leaded package with 0.400g mass and UL 94V-0 molding compound |
Pinout & Package
SA28C is a two-terminal unidirectional TVS diode in DO-204AC (DO-15) package. Cathode is marked by a band on the body; anode is unmarked end. Leads are pure tin-plated and solderable per J-STD-002.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / transient return path | Connected to system ground or low-side reference; completes clamping loop during overvoltage |
| Cathode | Protected line connection / transient sink | Connected to I/O line or power rail being protected; conducts avalanche current into ground |
Key Features
| Feature | Design Value |
|---|---|
| Unidirectional clamping architecture | Enables precise protection of DC power rails and single-polarity signal lines without bidirectional leakage trade-offs |
| 500W peak pulse rating (10/1000μs) | Withstands ISO 7637-2 Pulse 1, 2a, 3a/b, and IEC 61000-4-5 Level 3 surges without degradation |
| <1.0ps response time (0V → VBR) | Clamps transients before sensitive ICs experience damaging overvoltage - faster than most microcontroller GPIO protection |
| AEC-Q101 qualification option (SA28CH) | Validated for automotive electronics including body control modules, lighting drivers, and sensor interfaces |
| RoHS & halogen-free (IEC 61249-2-21) | Meets global environmental compliance requirements for industrial and automotive manufacturing |
Applications
| Automotive Power Rail Protection | Industrial PLC Input Protection |
|---|---|
Use Scenario: Protecting 24V battery-fed ECUs from load dump and alternator transients in passenger vehicles and commercial trucks. IC Role / Device Role / Timing Role: Primary clamping device placed at main power entry point, shunting surge energy to chassis ground before reaching DC-DC converters and microcontrollers. Use Value: Limits rail voltage to ≤48.4V during 10A surge events, preventing latch-up or permanent damage to downstream 3.3V/5V logic. | Use Scenario: Safeguarding digital input channels of programmable logic controllers exposed to inductive kickback from solenoids and contactors. IC Role / Device Role / Timing Role: Front-end transient absorber mounted directly at terminal block, absorbing >500W spikes before signal conditioning circuitry. Use Value: Maintains <1μA leakage at 24V nominal, ensuring clean logic thresholds and eliminating false triggering in 24V sinking inputs. |
| LED Driver Overvoltage Clamping | ESD-Sensitive Sensor Interface Protection |
Use Scenario: Shielding constant-current LED driver ICs from voltage reversals and switching transients in streetlight and signage applications. IC Role / Device Role / Timing Role: Unidirectional TVS placed between driver output and LED string cathode, clamping reverse polarity and inductive spikes. Use Value: Withstands 70A single half-sine surge (8.3ms), protecting driver MOSFETs from avalanche failure during hot-plug or wiring faults. | Use Scenario: Protecting analog front-ends of automotive temperature, pressure, and position sensors connected via long harnesses. IC Role / Device Role / Timing Role: Localized TVS at connector interface, suppressing ESD (IEC 61000-4-2 ±15kV air/±8kV contact) and EFT bursts before signal conditioning amplifiers. Use Value: Sub-1.0ps response ensures clamping occurs prior to amplifier input stage breakdown, preserving measurement accuracy and longevity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ28A (Bourns) | Same DO-214AA package; 28V VWM, 45.7V VC @ 10.3A; higher clamping ratio but lower PPK (600W) | Surface-mount only; unsuitable for through-hole PCBs requiring DO-15 footprint | Select SMBJ28A only when board space constraints mandate SMD layout and thermal management supports SMB footprint |
| P6KE28A (Littelfuse) | DO-15 package; 28V VWM, 43.0V VC @ 11.5A; 600W rating; slightly tighter VBR tolerance (31.1–34.4V) | Not AEC-Q101 qualified; limited to industrial/commercial use unless re-qualified | Choose P6KE28A for cost-sensitive industrial designs where automotive qualification is not required |
Compared with SMBJ28A and P6KE28A, SA28C offers identical DO-15 mechanical fit and unidirectional functionality but distinguishes itself via AEC-Q101 availability (as SA28CH), tighter thermal derating curve above 75°C, and lower clamping voltage drift over temperature (35 mV/°C VBR coefficient).
Availability
SA28C is available at Aetrix Electronics and suitable for automotive electronics, industrial PLCs, LED lighting systems, and sensor interface designs requiring stable component supply and long-term obsolescence management.
Supply support for SA28C 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 headquartered in Hsinchu, Taiwan, specializing in discrete power devices, TVS diodes, rectifiers, and MOSFETs for automotive and industrial markets.
The SA Series was developed specifically for high-reliability transient suppression in harsh environments, emphasizing AEC-Q101 compliance, wide temperature operation, and consistent clamping performance across production lots.
FAQ
What is the polarity configuration of SA28C?
SA28C is a unidirectional TVS diode, with cathode identified by a band on the DO-204AC (DO-15) package body. It conducts avalanche current only when cathode voltage exceeds anode voltage by ≥31.1V, making it suitable for DC power rail protection where reverse polarity is not expected. The SA28C does not conduct in the reverse direction below its breakdown threshold.
Does SA28C meet AEC-Q101 reliability standards?
Yes - the SA28C is available in AEC-Q101-qualified version as SA28CH. This variant undergoes stress testing including HTGB, HTRB, TCT, and ESD per AEC-Q101 Rev D, and is intended for automotive applications such as body control modules and lighting systems. Standard SA28C is not AEC-Q101 qualified unless ordered with 'H' suffix.
What is the maximum clamping voltage of SA28C under surge conditions?
The maximum clamping voltage (VC) of SA28C is 48.4V at 10A peak pulse current (IPPM), measured using the standardized 10/1000μs double-exponential waveform. This value represents the upper limit of voltage seen by protected circuitry during worst-case surge events, and remains stable across –55°C to +125°C ambient operating range per datasheet Fig.2 derating curve.
Can SA28C be used in bidirectional applications?
No - SA28C is strictly unidirectional and must not be used in AC or bipolar signal paths. For bidirectional protection, select SA28CA (if available) or equivalent bidirectional TVS like SMAJ28A. Using SA28C in reverse-biased configurations risks permanent damage due to lack of symmetrical avalanche structure and undefined reverse conduction behavior beyond VWM.
What is the junction-to-ambient thermal resistance (RθJA) of SA28C in standard mounting?
The datasheet does not specify RθJA for SA28C; instead, it defines steady-state power dissipation (PD = 3W) when mounted on 10 × 10 mm copper pads per terminal at TL = 75°C. Thermal performance depends on PCB copper area, airflow, and lead length - for thermal design, refer to Fig.2 derating curve and apply 3W limit at 75°C lead temperature, decreasing linearly to zero at 175°C.
SA28C 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:
- 48.4V
- Current - Peak Pulse (10/1000µs):
- 10A
- Power - Peak Pulse:
- 500W
- Power Line Protection:
- No
- Applications:
- General Purpose
- 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)
SA28C FAQ
1.How can I place an order for SA28C through Aetrix?
Please submit a Request for Quotation (RFQ) for SA28C 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 SA28C reliable?
The price and inventory of SA28C are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA28C is usually 5 days.
3.What payment methods are accepted for SA28C?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA28C transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA28C?
SA28C orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA28C 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 SA28C?
For technical support, including SA28C datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA28C requirements.
6.How does Aetrix verify that SA28C is sourced from the original manufacturer or authorized distributors?
All SA28C 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 SA28C meets industry standards.
7.What is the process for return or replacement of SA28C?
All SA28C units undergo pre-shipment inspection (PSI). If there is an issue with SA28C, 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 SA28C part is unused and in its original packaging.
Return procedure for SA28C:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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