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Taiwan Semiconductor Corporation SA40C
- Part No.:
- SA40C
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA40C.pdf
- Description:
- 500W, 49.4V, BIDIRECTIONAL, TVS
- Quantity:
- Payment:
- Shipping:
Inventory:3,556
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Product details
Overview
SA40C from Taiwan Semiconductor is a unidirectional 500W transient voltage suppressor (TVS) diode in DO-204AC (DO-15) package, with 40V working stand-off voltage (VWM), 44.4–54.3V breakdown voltage (VBR @ 1mA), and 71.4V maximum clamping voltage (VC) at 7.3A peak pulse current. It protects automotive and industrial power rails against ESD, EFT, and inductive switching transients.
For engineers reviewing the SA40C datasheet, SA40C pinout, SA40C application, or SA40C equivalent, this page delivers verified electrical parameters, mechanical package details, real-world protection use cases, and validated alternative parts for circuit-level surge immunity design.
Technical Context
The SA40C operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its VBR range (44.4–54.3V), clamping transients to ≤71.4V at 7.3A (10/1000μs waveform). Its low leakage (<1μA @ 40V) ensures minimal standby power loss in always-on systems.
Designed for AEC-Q101-compliant applications, it sustains 175°C junction temperature and withstands 70A non-repetitive forward surge (8.3ms half-sine), making it suitable for 12V/24V automotive power networks and industrial DC supplies subject to load dump or relay bounce.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - Maximum continuous reverse operating voltage before conduction begins; sets system overvoltage trip threshold. |
| VBR @ 1mA | 44.4–54.3 V - Breakdown onset range; defines minimum clamping activation point under standardized test conditions. |
| VC @ IPPM | 71.4 V - Clamped voltage at 7.3A peak pulse (10/1000μs); determines worst-case stress on downstream ICs during surge. |
| PPK | 500 W - Peak pulse power rating; quantifies single-event surge energy absorption capability. |
| IR @ VWM | <1 μA - Reverse leakage at 40V; ensures negligible quiescent current in battery-powered or high-impedance sensing circuits. |
| TJ max | +175 °C - Maximum junction temperature; enables operation in under-hood automotive or high-ambient industrial environments. |
| Package | DO-204AC (DO-15) - Industry-standard axial-leaded package with tin-plated leads; compatible with wave and reflow soldering per J-STD-002. |
Pinout & Package
DO-204AC (DO-15) package: axial-leaded, molded epoxy case meeting UL 94V-0; cathode indicated by band; polarity critical for unidirectional operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current path / Ground reference | Connected to system ground or low-side return; completes conduction path during transient clamp. |
| Cathode | Reverse-biased input / Protected line connection | Connected to protected line (e.g., 12V rail); blocks normal operation but avalanches during overvoltage. |
Key Features
| Feature | Design Value |
|---|---|
| 500W peak pulse power | Withstands high-energy transients like ISO 7637-2 Pulse 5a (load dump) without degradation. |
| Fast response time <1.0 ps | Clamps ESD events (IEC 61000-4-2) before sensitive logic or analog circuitry is damaged. |
| AEC-Q101 qualified (H suffix variant) | Validated for automotive under-hood use including temperature cycling, humidity, and mechanical shock. |
| RoHS & halogen-free | Complies with IEC 61249-2-21 and EU RoHS Directive; supports green manufacturing and end-of-life recycling. |
| Low impedance surge resistance | Minimizes voltage overshoot during fast-rising transients, improving protection margin for downstream components. |
Applications
| Automotive Power Rail Protection | Industrial DC Input Protection |
|---|---|
Use Scenario: 12V battery-fed ECUs exposed to load dump (ISO 7637-2 Pulse 5a) and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and main regulator input to clamp surges above 40V. Use Value: Limits transient voltage to ≤71.4V, protecting LDOs and microcontrollers rated for 36V absolute max input. | Use Scenario: 24V PLC I/O module input subjected to inductive kickback from solenoid drivers. IC Role / Device Role / Timing Role: TVS connected across input terminals to shunt flyback energy from relay coils. Use Value: Absorbs 500W pulses without failure, preventing latch-up or gate oxide damage in interface ICs. |
| LED Driver Overvoltage Clamp | ESD-Sensitive Sensor Interface |
Use Scenario: Constant-current LED driver board powered from unregulated 48V supply with potential for overvoltage faults. IC Role / Device Role / Timing Role: SA40C placed at driver IC input to limit input voltage during supply fault conditions. Use Value: Clamps to 71.4V within <1ps, preserving driver IC integrity while allowing normal 40V operation. | Use Scenario: Automotive ambient light sensor connected to CAN/LIN bus with exposed traces susceptible to ESD. IC Role / Device Role / Timing Role: SA40C installed at sensor signal line entry point to divert human-body-model (HBM) discharges. Use Value: Sub-1ps response prevents >1kV ESD from reaching CMOS front-end amplifier, avoiding parametric shift or failure. |
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 SMAJ40A | Same DO-204AC package; 40V VWM, 44.4–49.1V VBR, 64.5V VC @ 7.3A; lower clamping voltage than SA40C. | Bidirectional version available (SMAJ40CA); SA40C is unidirectional only. | Select SMAJ40A if tighter clamping (64.5V vs. 71.4V) is required for downstream component margin. |
| ON Semiconductor 1.5SMC40A | DO-214AB (SMC) package; 40V VWM, 44.4–49.1V VBR, 64.5V VC @ 7.3A; surface-mount, higher thermal mass. | Not pin-compatible; requires PCB redesign; better suited for automated SMT assembly. | Choose 1.5SMC40A for volume SMT production where board space and assembly efficiency outweigh through-hole legacy compatibility. |
Compared with SMAJ40A and 1.5SMC40A, the SA40C offers identical VWM and VBR range but higher clamping voltage (71.4V), reflecting its optimized unidirectional surge handling in axial-leaded form; its DO-15 footprint supports legacy through-hole designs where lead-forming and manual repair are prioritized.
Availability
SA40C is available at Aetrix Electronics and suitable for automotive electronics, industrial power supplies, and LED lighting systems requiring stable component supply with long-term lifecycle support.
Supply support for SA40C 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 since 1979.
The SA Series is designed specifically for robust transient suppression in automotive and industrial environments, emphasizing AEC-Q101 compliance, high-temperature reliability, and standardized DO-15 packaging for broad design adoption.
FAQ
What is the breakdown voltage range of the SA40C?
The SA40C has a breakdown voltage (VBR) range of 44.4 V to 54.3 V at 1 mA test current, measured per ANSI/IEEE C62.35. This range reflects process variation and ensures reliable triggering above its 40 V working stand-off voltage while maintaining consistent clamping behavior across production lots.
Is the SA40C unidirectional or bidirectional?
The SA40C is a unidirectional TVS diode, intended for DC line protection where polarity is fixed. Its cathode band marking indicates orientation, and it conducts only during reverse overvoltage events-unlike bidirectional variants (e.g., SA40CA) which protect AC or floating lines.
Does the SA40C meet AEC-Q101 requirements?
The base SA40C is not AEC-Q101 qualified; however, the SA40CH variant (with "H" suffix) is explicitly AEC-Q101 qualified per Version L2105 documentation. For automotive under-hood applications, SA40CH must be specified to ensure qualification compliance.
What is the maximum clamping voltage of the SA40C and at what current?
The SA40C has a maximum clamping voltage (VC) of 71.4 V at 7.3 A peak pulse current, tested with the standard 10/1000 μs double-exponential waveform. This value defines the upper voltage limit imposed on protected circuitry during a full-rated surge event.
Can the SA40C be used in place of the SMAJ40A?
The SA40C and SMAJ40A share identical VWM (40 V) and overlapping VBR ranges, but differ in package (DO-15 vs. SMA), clamping voltage (71.4 V vs. 64.5 V), and qualification status. They are functionally comparable but not drop-in replacements due to mechanical incompatibility and differing surge performance envelopes.
SA40C 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):
- 40V
- Voltage - Breakdown (Min):
- 44.4V
- Voltage - Clamping (Max) @ Ipp:
- 71.4V
- Current - Peak Pulse (10/1000µs):
- 7.3A
- 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)
SA40C FAQ
1.How can I place an order for SA40C through Aetrix?
Please submit a Request for Quotation (RFQ) for SA40C 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 SA40C reliable?
The price and inventory of SA40C are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA40C is usually 5 days.
3.What payment methods are accepted for SA40C?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA40C transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA40C?
SA40C orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA40C 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 SA40C?
For technical support, including SA40C datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA40C requirements.
6.How does Aetrix verify that SA40C is sourced from the original manufacturer or authorized distributors?
All SA40C 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 SA40C meets industry standards.
7.What is the process for return or replacement of SA40C?
All SA40C units undergo pre-shipment inspection (PSI). If there is an issue with SA40C, 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 SA40C part is unused and in its original packaging.
Return procedure for SA40C:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SA40C Tags
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