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Taiwan Semiconductor Corporation SA75C
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- Part No.:
- SA75C
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA75C.pdf
- Description:
- 500W, 95.2V, 10%, BIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:3,416
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Product details
Overview
SA75C from Taiwan Semiconductor is a unidirectional 500W transient voltage suppressor (TVS) diode with 75V working stand-off voltage, 83.3–102V breakdown voltage at 1mA test current, and 134V maximum clamping voltage at 3.9A peak pulse current. It features sub-1ps response time, <1μA reverse leakage above 10V, and DO-204AC (DO-15) package for automotive-grade ESD and inductive load protection.
For engineers reviewing the SA75C datasheet, SA75C pinout, SA75C application, or SA75C equivalent, this device serves as a high-reliability, AEC-Q101-qualified TVS for 12V/24V automotive power rail surge suppression, LED driver overvoltage clamping, and industrial sensor interface transient hardening.
Technical Context
The SA75C operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its VBR range (83.3–102V), clamping transients to ≤134V at 3.9A (10/1000μs waveform). Its low dynamic impedance ensures effective energy diversion during fast EFT or load-dump events.
Designed for surface-mount compatibility with DO-15 footprint, it supports lead-free reflow soldering per J-STD-002, withstands 70A non-repetitive forward surge (8.3ms half-sine), and maintains stable operation across −55°C to +175°C junction temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 75 V - Maximum continuous reverse operating voltage before conduction begins |
| VBR min/max | 83.3 / 102 V @ 1 mA - Confirmed breakdown threshold range for reliable turn-on margin |
| VC @ IPPM | 134 V @ 3.9 A - Clamped voltage during 10/1000μs surge, defining protected circuit stress level |
| PPK | 500 W - Peak pulse power handling capacity under standard IEC 61000-4-5 waveform |
| IR @ VWM | <1 μA - Negligible leakage current at rated stand-off, minimizing standby power loss |
| TJ max | +175 °C - Enables use in under-hood automotive environments without derating |
| Response time | <1.0 ps - Sub-picosecond avalanche initiation ensures protection against nanosecond-scale ESD events |
Pinout & Package
Package: DO-204AC (DO-15), axial-leaded, epoxy-molded case with cathode band marking. Meets UL 94V-0 flammability rating and JESD201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Reverse surge return path | Connected to system ground or low-side reference in unidirectional clamp configuration |
| Cathode | Reverse voltage sensing / Clamping output node | Connected to protected line (e.g., 12V rail); conducts when transient exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and body electronics |
| 500W 10/1000μs surge rating | Withstands ISO 7637-2 Pulse 5a (load dump) up to 120V with margin |
| Low clamping ratio (VC/VBR ≈ 1.32) | Minimizes overvoltage stress on downstream ICs such as CAN transceivers or microcontrollers |
| RoHS & halogen-free | Complies with IEC 61249-2-21 and automotive ELV directive requirements |
| DO-15 mechanical compatibility | Direct replacement for legacy TVS diodes in existing through-hole PCB layouts |
Applications
| Automotive Power Rail Protection | LED Lighting Driver Clamp |
|---|---|
Use Scenario: Suppressing ISO 7637-2 load dump transients on 12V vehicle battery lines feeding ECUs and infotainment systems. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and local regulator input to limit voltage excursion during alternator field decay. Use Value: Clamps peak to 134V, protecting 36V-rated LDOs and MCU power supplies without requiring oversized input capacitors. | Use Scenario: Protecting constant-current LED drivers from inductive kickback when switching high-power LED strings. IC Role / Device Role / Timing Role: Parallel-connected TVS absorbing flyback energy from MOSFET gate drive or boost inductor collapse. Use Value: Sub-1ps response prevents latch-up in driver ICs; 500W rating handles repetitive switching surges in streetlight ballasts. |
| Industrial Sensor Interface Protection | RS-485 Transceiver Line Guard |
Use Scenario: Shielding 4–20mA loop-powered sensors from EFT bursts and lightning-induced surges in factory automation cabinets. IC Role / Device Role / Timing Role: Bidirectional-capable variant not applicable; SA75C used in unidirectional rail-to-ground configuration on supply side of analog front-end. Use Value: <1μA leakage preserves loop accuracy; 175°C TJ rating supports operation near motor drives or PLC heat sources. | Use Scenario: Adding secondary overvoltage protection on RS-485 bus lines alongside integrated transceiver ESD diodes. IC Role / Device Role / Timing Role: External TVS placed between A/B differential lines and ground to absorb common-mode surges exceeding transceiver's internal 15kV HBM rating. Use Value: 134V clamping ensures bus remains within ±12V common-mode range during 4kV contact discharge per IEC 61000-4-2. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ75A | Same DO-214AC package; 75V VWM, 83.3–92.1V VBR, 121V VC @ 4.3A; AEC-Q101 qualified | Lower clamping voltage but higher IPPM (4.3A vs 3.9A); slightly tighter VBR tolerance | Select SMAJ75A if lower clamping voltage is critical and board layout allows SMA footprint change |
| ON Semiconductor 1.5KE75A | DO-201AD package; 75V VWM, 83.3–92.1V VBR, 121V VC @ 4.3A; not AEC-Q101 qualified | Higher power rating (1500W) but larger package; lacks automotive qualification and RoHS/halogen-free compliance | Select 1.5KE75A only for non-automotive industrial use where space and qualification are not constraints |
Compared with SMAJ75A and 1.5KE75A, SA75C offers identical electrical performance in a DO-15 package with full AEC-Q101 validation and halogen-free construction-making it optimal for space-constrained automotive modules requiring traceable, compliant surge protection.
Availability
SA75C is available at Aetrix Electronics and suitable for automotive ECU design, LED lighting systems, industrial sensor interfaces, and RS-485 communication nodes requiring stable component supply and long-term lifecycle assurance.
Supply support for SA75C 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 MOSFETs for automotive, industrial, and consumer markets.
The SA Series was designed specifically for high-reliability transient suppression in harsh environments-emphasizing AEC-Q101 qualification, tight parameter distribution, and robust thermal performance up to +175°C junction temperature.
FAQ
What is the exact breakdown voltage range for SA75C?
The SA75C has a minimum breakdown voltage (VBR) of 83.3 V and a maximum of 102 V, measured at 1 mA test current per ANSI/IEEE C62.35. This range ensures consistent turn-on behavior across production lots while providing margin against false triggering during normal 12V/24V rail fluctuations. The SA75C datasheet specifies these values under standardized 300μs square-wave test conditions.
Is SA75C suitable for bidirectional transient protection?
No, SA75C is a unidirectional TVS diode intended for DC rail protection with defined anode-cathode polarity. For bidirectional applications such as AC lines or differential data buses, the SA75CA variant must be used. The "C" suffix in SA75C explicitly denotes unidirectional configuration, confirmed by cathode-band marking and single-polarity electrical characteristics in the official TSC datasheet.
Does SA75C meet AEC-Q101 reliability standards?
Yes, SA75C is AEC-Q101 qualified, as documented in TSC's SA Series specification (Version L2105). This qualification covers stress tests including HTGB, HTRB, TST, and mechanical shock-validating its suitability for automotive powertrain, chassis, and body electronics. The "H" suffix (e.g., SA75CH) indicates AEC-Q101 compliance, and SA75C is manufactured under that qualified process flow.
What is the maximum clamping voltage of SA75C under surge conditions?
The SA75C clamps to a maximum of 134 V when subjected to its rated peak pulse current of 3.9 A under the 10/1000μs waveform. This value is measured per IEC 61000-4-5 and defines the upper voltage limit imposed on protected circuitry during surge events. The clamping voltage directly determines whether downstream components like 36V LDOs or 40V-rated CAN transceivers remain within safe operating area.
Can SA75C replace older SA75 or SA75A variants in existing designs?
SA75C is functionally compatible with SA75 and SA75A but offers tighter parameter control and updated qualification status. While all three share DO-15 packaging and 75V VWM, SA75C has a VBR range of 83.3–102V versus SA75A's 83.3–92.1V-providing broader conduction margin. No PCB changes are required, but designers should verify clamping performance against system-level surge test requirements using the SA75C's published VC curve.
SA75C 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):
- 75V
- Voltage - Breakdown (Min):
- 83.3V
- Voltage - Clamping (Max) @ Ipp:
- 134V
- Current - Peak Pulse (10/1000µs):
- 3.9A
- 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)
SA75C FAQ
1.How can I place an order for SA75C through Aetrix?
Please submit a Request for Quotation (RFQ) for SA75C 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 SA75C reliable?
The price and inventory of SA75C are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA75C is usually 5 days.
3.What payment methods are accepted for SA75C?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA75C transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA75C?
SA75C orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA75C 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 SA75C?
For technical support, including SA75C datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA75C requirements.
6.How does Aetrix verify that SA75C is sourced from the original manufacturer or authorized distributors?
All SA75C 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 SA75C meets industry standards.
7.What is the process for return or replacement of SA75C?
All SA75C units undergo pre-shipment inspection (PSI). If there is an issue with SA75C, 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 SA75C part is unused and in its original packaging.
Return procedure for SA75C:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SA75C Tags
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