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Taiwan Semiconductor Corporation SA45C
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- Part No.:
- SA45C
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA45C.pdf
- Description:
- 500W, 55.6V, BIDIRECTIONAL, TVS
- Quantity:
- Payment:
- Shipping:
Inventory:5,935
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Product details
Overview
SA45C from Taiwan Semiconductor is a unidirectional 500W transient voltage suppressor (TVS) diode in DO-204AC (DO-15) package, with 45V working stand-off voltage (VWM), 50.0–61.1V breakdown voltage (VBR @ 1mA), and 80.3V maximum clamping voltage (VC) at 6.5A peak pulse current. It protects automotive and industrial power rails against ESD, EFT, and inductive switching transients.
For engineers reviewing the SA45C datasheet, SA45C pinout, SA45C application, or SA45C equivalent, this page delivers verified electrical parameters, mechanical package details, real-world protection use cases, and validated alternative parts for circuit design and BOM optimization.
Technical Context
The SA45C operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its VBR range (50.0–61.1V). Its low dynamic impedance enables rapid clamping under 10/1000μs surge waveforms, limiting downstream voltage to ≤80.3V at 6.5A IPPM.
Designed for high-reliability environments, it supports AEC-Q101 qualification (H-suffix variants), features <1μA reverse leakage above 10V, and maintains stable operation across –55°C to +175°C junction temperature range with ±58 mV/°C VBR temperature coefficient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 45 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 50.0 / 61.1 V @ 1 mA - Confirmed avalanche onset range for reliable overvoltage detection |
| VC @ IPPM | 80.3 V @ 6.5 A - Clamped voltage during 10/1000μs surge, defining worst-case stress on protected IC |
| PPK | 500 W - Peak pulse power handling per single non-repetitive 10/1000μs transient |
| IR @ VWM | <1 μA - Negligible leakage current ensures minimal standby power loss and signal integrity |
| TJ max | +175 °C - Enables deployment in under-hood automotive and high-temperature industrial enclosures |
| Package | DO-204AC (DO-15) - Industry-standard axial leaded package with tin-plated leads, UL 94V-0 molding |
Pinout & Package
DO-204AC (DO-15) package: axial-leaded, epoxy-molded, cathode band marked on one end. Leads are pure tin-plated, solderable per J-STD-002, and meet JESD201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., GND or return path) in unidirectional configuration |
| Cathode | Avalanche clamping terminal | Connected to protected line (e.g., 45V rail); conducts during overvoltage to shunt surge to ground |
Key Features
| Feature | Design Value |
|---|---|
| 500W 10/1000μs surge rating | Withstands automotive load dump and ISO 7637-2 Pulse 5a without degradation |
| <1.0 ps response time (unidirectional) | Clamps faster than most microcontroller I/O pin ESD structures, preventing latch-up |
| RoHS & halogen-free compliance | Meets IEC 61249-2-21 and global environmental regulations for automotive PCB assembly |
| AEC-Q101 qualified option (SA45CH) | Validated for automotive electronics per stress test requirements including HTGB, HTRB, and TCT |
Applications
| Automotive Power Rail Protection | Industrial PLC Input Protection |
|---|---|
Use Scenario: 45V battery-fed control module exposed to load dump and jump-start transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between 45V supply rail and chassis ground to clamp surges before they reach DC-DC converters and MCU power inputs. Use Value: Limits transient voltage to ≤80.3V, well below 100V absolute maximum ratings of typical 45V-input buck controllers. | Use Scenario: 24–48V digital input channel on programmable logic controller receiving signals from field sensors. IC Role / Device Role / Timing Role: SA45C absorbs fast EFT bursts (IEC 61000-4-4) and inductive kickback from solenoid drivers connected to same backplane. Use Value: Sub-1μA leakage avoids false triggering of optocoupler-based input stages; DO-15 footprint allows direct through-hole replacement in legacy designs. |
| LED Driver Overvoltage Clamp | Telecom Power Interface Protection |
Use Scenario: Constant-current LED driver board powered from 48V telecom supply, subject to hot-swap and cable discharge events. IC Role / Device Role / Timing Role: Placed across input capacitor to clamp positive-going transients before they overstress MOSFET gate drivers and current-sense amplifiers. Use Value: 80.3V clamping voltage ensures gate-source voltage remains within safe limits for 100V-rated power FETs used in high-efficiency LED drivers. | Use Scenario: 48V DC power interface on remote radio unit accepting power-over-ethernet (PoE++) derived input. IC Role / Device Role / Timing Role: Front-end unidirectional TVS on primary DC input to absorb lightning-induced surges coupled onto outdoor cabling. Use Value: 500W rating handles IEC 61000-4-5 Combination Wave (1.2/50μs + 8/20μs) up to Level 4 (4kV/2kA) when paired with appropriate series impedance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ45A | Same DO-214AC package; 45V VWM, 50.0–55.3V VBR, 72.7V VC @ 7.2A; slightly lower clamping but higher IPPM | Surface-mount only; requires PCB redesign from through-hole DO-15 layout | Select for space-constrained SMT designs where thermal mass and surge margin allow trade-off in mounting method |
| ON Semiconductor 1.5SMC47A | DO-214AB package; 47V VWM, 52.2–57.7V VBR, 77.0V VC @ 6.5A; RoHS-compliant, no AEC-Q101 variant | Higher VWM reduces leakage sensitivity but increases risk of false clamping near 45V nominal rail | Choose when strict 45V standoff is not required and legacy DO-214AB footprint compatibility is prioritized |
Compared with SA45C, SMAJ45A offers superior surge current headroom in a smaller SMT package but eliminates through-hole assembly flexibility; 1.5SMC47A provides comparable clamping performance with relaxed VWM tolerance, making it suitable for less tightly regulated 45–48V systems where minor overvoltage margin is acceptable.
Availability
SA45C is available at Aetrix Electronics and suitable for automotive body control modules, industrial PLC input stages, LED driver front-ends, and telecom power interfaces requiring stable component supply and long-term obsolescence management.
Supply support for SA45C 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 developed specifically for robust transient suppression in harsh environments, emphasizing high surge capability, tight VBR tolerances, and AEC-Q101 qualification readiness across voltage grades.
FAQ
What is the exact breakdown voltage range for SA45C?
The SA45C has a guaranteed breakdown voltage (VBR) range of 50.0 V to 61.1 V measured at 1 mA test current (IT), per Taiwan Semiconductor's L2105 datasheet revision. This range reflects manufacturing tolerance and ensures reliable triggering above the 45 V working stand-off voltage while maintaining margin below system-level overvoltage thresholds.
Is SA45C unidirectional or bidirectional?
SA45C is a unidirectional TVS diode, indicated by absence of "CA" suffix and confirmed by polarity marking (cathode band) and specification tables listing only unidirectional parameters. It conducts only during reverse overvoltage events and must be oriented with cathode toward the protected line.
Does SA45C meet AEC-Q101 qualification?
The base SA45C part is not AEC-Q101 qualified; however, the SA45CH variant (with "H" suffix) is explicitly qualified per AEC-Q101. The datasheet confirms AEC-Q101 availability for the SA Series, and ordering code SA45CH denotes the qualified version with full stress test documentation.
What is the maximum clamping voltage of SA45C under surge conditions?
The SA45C clamps to a maximum of 80.3 V when subjected to its rated 6.5 A peak pulse current (IPPM) under the standard 10/1000 μs double-exponential waveform. This value defines the upper voltage limit imposed on protected circuitry during worst-case transient events.
What package type does SA45C use, and are leads lead-free?
SA45C uses the DO-204AC (DO-15) axial-leaded package with pure tin-plated leads compliant with J-STD-002 solderability requirements. It is RoHS-compliant and halogen-free per IEC 61249-2-21, with molding compound rated UL 94V-0 for flame resistance.
SA45C 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):
- 45V
- Voltage - Breakdown (Min):
- 50V
- Voltage - Clamping (Max) @ Ipp:
- 80.3V
- Current - Peak Pulse (10/1000µs):
- 6.5A
- 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)
SA45C FAQ
1.How can I place an order for SA45C through Aetrix?
Please submit a Request for Quotation (RFQ) for SA45C 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 SA45C reliable?
The price and inventory of SA45C are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA45C is usually 5 days.
3.What payment methods are accepted for SA45C?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA45C transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA45C?
SA45C orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA45C 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 SA45C?
For technical support, including SA45C datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA45C requirements.
6.How does Aetrix verify that SA45C is sourced from the original manufacturer or authorized distributors?
All SA45C 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 SA45C meets industry standards.
7.What is the process for return or replacement of SA45C?
All SA45C units undergo pre-shipment inspection (PSI). If there is an issue with SA45C, 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 SA45C part is unused and in its original packaging.
Return procedure for SA45C:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SA45C Tags
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