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Taiwan Semiconductor Corporation SA40
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- Part No.:
- SA40
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA40.pdf
- Description:
- 500W, 49.4V, UNIDIRECTIONAL, TVS
- Quantity:
- Payment:
- Shipping:
Inventory:6,297
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Product details
Overview
SA40 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, 40V working stand-off voltage, and 71.4V maximum clamping voltage at 7.3A peak pulse current. It provides fast ESD and surge protection for automotive lighting control modules and industrial I/O interfaces.
For engineers reviewing the SA40 datasheet, SA40 pinout, SA40 application, or SA40 equivalent, key selection criteria include its 40V VWM, 44.4–54.3V VBR range at 1mA, <1μA reverse leakage above 10V, 1.0ps response time, and AEC-Q101 qualification option (SA40H).
Technical Context
The SA40 operates as a unidirectional avalanche diode, triggering when reverse voltage exceeds its breakdown threshold (44.4–54.3V), then clamping transients to ≤71.4V at 7.3A. Its low dynamic impedance ensures effective energy diversion during 10/1000μs surges.
Designed for high-reliability environments, it supports junction temperatures from –55°C to +175°C, features pure tin-plated leads compliant with J-STD-002, and meets UL 94V-0 flammability and JESD201 Class 2 whisker resistance standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 44.4 V / 54.3 V at 1 mA - Confirmed breakdown range defining turn-on threshold tolerance |
| VC @ IPPM | 71.4 V at 7.3 A - Clamping voltage under full 500W surge, limiting downstream stress |
| PPK | 500 W - Peak pulse power handling per 10/1000μs waveform, per IEC 61000-4-5 |
| IR @ VWM | <1 μA - Negligible leakage at rated stand-off, preserving signal integrity in high-impedance circuits |
| TJ max | +175 °C - Enables use in under-hood automotive and high-temperature industrial enclosures |
| Response time | <1.0 ps - Sub-picosecond avalanche initiation ensures protection before IC damage occurs |
Pinout & Package
Package: DO-204AC (DO-15), axial leaded, epoxy-molded case with cathode band marking. Complies with JEDEC DO-15 outline, UL 94V-0, and RoHS/halogen-free requirements.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to circuit ground or lower-potential node in unidirectional configuration |
| Cathode | Reverse-biased clamping terminal | Connected to protected line (e.g., CAN_H, LIN, sensor supply); marked with band |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified variant available | SA40H meets automotive-grade reliability testing for engine control, lighting, and body electronics |
| Low clamping ratio (VC/VBR) | ~1.4–1.6 - Tight voltage margin between breakdown and clamping improves system-level surge margin |
| High surge current capability | 7.3 A peak pulse current - Sustains repeated 500W transients without degradation |
| Ultra-fast response | <1.0 ps rise-to-VBR - Outperforms typical TVS diodes (>1 ns) in ESD-sensitive analog front-ends |
| Thermal robustness | 175°C max junction temperature - Supports operation in sealed enclosures near heat sources |
Applications
| Automotive LED Headlamp Driver Protection | Industrial PLC Digital Input Protection |
|---|---|
Use Scenario: Protects MOSFET gate drivers and current-sense amplifiers in 48V LED headlamp systems against load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Unidirectional TVS placed across input supply rail to clamp transients before they reach driver ICs. Use Value: Limits clamping voltage to 71.4V, staying below 80V absolute max ratings of common 48V-rated gate drivers and op-amps. | Use Scenario: Shields 24V digital input channels on programmable logic controllers from field-wiring induced surges and EFT bursts. IC Role / Device Role / Timing Role: Standoff device on input line, conducting only during >40V transients while remaining invisible to normal 0–24V logic states. Use Value: <1μA leakage preserves input hysteresis thresholds; 71.4V clamping prevents latch-up in Schmitt-trigger input buffers. |
| Automotive LIN Bus Node Protection | Smart Sensor Power Rail Protection |
Use Scenario: Safeguards LIN transceivers in door module ECUs against battery reverse connection and jump-start spikes. IC Role / Device Role / Timing Role: Unidirectional TVS connected between LIN bus line and chassis ground, absorbing negative-going transients. Use Value: 1.0ps response ensures clamping initiates before LIN transceiver's internal ESD structures fail during fast-rising spikes. | Use Scenario: Guards 3.3V/5V power rails of MEMS pressure sensors in HVAC and industrial monitoring systems. IC Role / Device Role / Timing Role: Secondary protection stage after primary DC-DC converter, catching residual transients that bypass bulk filtering. Use Value: 40V VWM allows placement directly on 24V or 48V supply inputs upstream of regulators, enabling single-stage robustness. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ40A (Bourns) | Same DO-214AC package; 40V VWM, 64.5V VC @ 7.8A; 400W rating | Lower peak power (400W vs. 500W) limits use in high-energy load-dump scenarios | Preferred where board space requires SMD; verify thermal pad layout matches SMAJ footprint |
| P6KE40A (Littelfuse) | DO-204AC package; 40V VWM, 64.5V VC @ 7.8A; 600W rating but larger DO-15 body | Higher PPK enables heavier surge duty; slightly higher IR (5μA) may affect ultra-low-power nodes | Drop-in replacement for legacy P6KE designs; same pinout and mounting, but higher surge margin |
Compared with SMAJ40A and P6KE40A, the SA40 delivers identical VWM and superior clamping voltage consistency (71.4V vs. 64.5V) at lower test current, while offering AEC-Q101 qualification path (SA40H) not available in the P6KE series.
Availability
SA40 is available at Aetrix Electronics and suitable for automotive lighting control, industrial PLC I/O protection, and smart sensor power rail hardening requiring stable component supply and long-term lifecycle support.
Supply support for SA40 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 is designed specifically for high-energy transient suppression in harsh environments, emphasizing AEC-Q101 compliance, tight VBR tolerances, and robust surge endurance in axial-leaded packages.
FAQ
What is the breakdown voltage range for SA40?
The SA40 has a minimum breakdown voltage (VBR) of 44.4 V and a maximum of 54.3 V, measured at 1 mA test current per ANSI/IEEE C62.35. This range reflects manufacturing tolerance and ensures reliable triggering across temperature and unit variance. The SA40 must be selected with system overvoltage margins accounting for this ±11% spread.
Is SA40 unidirectional or bidirectional?
The SA40 is a unidirectional TVS diode, intended for DC-coupled lines where polarity is fixed-such as power rails or single-ended data buses. Its cathode band marking indicates the clamping terminal. Bidirectional variants (e.g., SA40CA) exist in the SA family but are distinct part numbers; SA40 itself conducts only in reverse bias.
Does SA40 meet automotive qualification standards?
The base SA40 is not AEC-Q101 qualified; however, the SA40H variant-identical in electrical specs and DO-204AC packaging-is fully AEC-Q101 certified. SA40H undergoes stress testing including HTGB, HTRB, and temperature cycling to ensure reliability in automotive under-hood applications.
What is the maximum clamping voltage of SA40 under surge conditions?
The SA40 clamps to a maximum of 71.4 V when subjected to its rated 7.3 A peak pulse current (10/1000μs waveform). This value is guaranteed across temperature and lot, and defines the upper voltage limit imposed on protected circuitry during worst-case transients.
Can SA40 be used in place of P6KE40A?
SA40 and P6KE40A share DO-204AC (DO-15) packaging, 40V VWM, and unidirectional operation, making them mechanically interchangeable. However, SA40 offers tighter VBR tolerance (44.4–54.3V vs. 42.2–47.8V) and lower clamping voltage (71.4V vs. 64.5V at comparable current), though P6KE40A has higher 600W rating. System validation is required before substitution.
SA40 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:
- 1
- Bidirectional Channels:
- -
- 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)
SA40 FAQ
1.How can I place an order for SA40 through Aetrix?
Please submit a Request for Quotation (RFQ) for SA40 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 SA40 reliable?
The price and inventory of SA40 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA40 is usually 5 days.
3.What payment methods are accepted for SA40?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA40 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA40?
SA40 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA40 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 SA40?
For technical support, including SA40 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA40 requirements.
6.How does Aetrix verify that SA40 is sourced from the original manufacturer or authorized distributors?
All SA40 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 SA40 meets industry standards.
7.What is the process for return or replacement of SA40?
All SA40 units undergo pre-shipment inspection (PSI). If there is an issue with SA40, 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 SA40 part is unused and in its original packaging.
Return procedure for SA40:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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