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Taiwan Semiconductor Corporation SA40CA
- Part No.:
- SA40CA
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA40CA.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO204AC
- Quantity:
- Payment:
- Shipping:
Inventory:9,414
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Product details
Overview
SA40CA from Taiwan Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in DO-204AC (DO-15) package, rated for 500W peak pulse power at 10/1000μs, with 40V working stand-off voltage (VWM), 44.4–49.1V breakdown voltage (VBR), and 64.5V maximum clamping voltage (VC) at 8.1A peak pulse current - used to protect automotive lighting and industrial control circuits against ESD and inductive switching transients.
For engineers reviewing the SA40CA datasheet, SA40CA pinout, SA40CA application, or SA40CA equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification (indicated by 'H' suffix; SA40CA is not H-suffixed but CA denotes bidirectional), DO-15 mechanical compatibility, 175°C junction temperature rating, and low leakage (<1μA @ 40V) for low-power system integrity.
Technical Context
The SA40CA operates as a silicon avalanche diode designed for bidirectional transient suppression across both polarities, meeting IEC 61000-4-2 (ESD) and IEC 61000-4-4 (EFT) immunity requirements. Its clamping action begins at VBR min = 44.4V and limits induced surges to ≤64.5V at 8.1A, enabling robust protection of 3.3V/5V/12V interface lines without forward conduction interference.
It features fast response time (<5.0ns for bidirectional mode), low dynamic impedance (~7.96Ω derived from ΔVC/ΔIPPM), and thermal stability up to TJ = 175°C - critical for under-hood automotive modules and industrial PLC I/O where ambient temperatures exceed 105°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - Maximum continuous reverse operating voltage before clamping initiates; defines safe DC bias margin for protected circuitry. |
| VBR (min/max) | 44.4 V / 49.1 V - Breakdown threshold range at 1 mA test current; ensures reliable turn-on within defined tolerance band. |
| VC @ IPPM | 64.5 V at 8.1 A - Clamped voltage during 10/1000μs surge; determines worst-case overvoltage seen by downstream ICs. |
| PPK | 500 W - Peak pulse power handling per single non-repetitive event; supports high-energy transients like load dump or relay bounce. |
| IR @ VWM | <1 μA - Reverse leakage at rated stand-off voltage; minimizes quiescent power loss and signal distortion in high-impedance nodes. |
| TJ max | +175 °C - Maximum junction temperature; enables operation in engine compartment or enclosed industrial enclosures without derating. |
| Package | DO-204AC (DO-15) - Standard axial-leaded through-hole package with 0.400g mass; compatible with legacy wave-solder and hand-solder processes. |
Pinout & Package
DO-204AC (DO-15) package: axial-leaded, molded epoxy case with cathode band marking for unidirectional variants; SA40CA is bidirectional and has no polarity marking - terminals are symmetrical and interchangeable.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bidirectional avalanche junction | Either terminal serves as anode or cathode depending on transient polarity; no orientation required during PCB placement. |
| Lead 1 / Lead 2 | Surge current path | Full 500W surge current flows between leads; leads must be routed with ≥10 mm trace length to minimize inductance and preserve clamping performance. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines (e.g., RS-485, CAN bus stubs) without external polarity management. |
| 5.0 ns response time | Ensures clamping activation before ESD pulses (IEC 61000-4-2, 0.7–1 ns rise time) damage sensitive gate oxides in microcontrollers or transceivers. |
| AEC-Q101 qualified option available | SA40CA itself is not AEC-Q101 certified ('H' suffix required), but identical electrical specs are offered in AEC-Q101-compliant SA40CAH variant for automotive grade assurance. |
| RoHS & halogen-free | Complies with IEC 61249-2-21 and EU RoHS Directive 2011/65/EU - suitable for consumer, industrial, and Tier-2 automotive supply chains requiring material declarations. |
| 175°C junction rating | Supports uninterrupted operation in high-temperature environments such as LED driver housings or motor control boards without thermal shutdown or parameter drift. |
Applications
| Automotive Lighting Systems | Industrial PLC Digital I/O |
|---|---|
Use Scenario: Protecting LED headlamp drivers from load-dump transients (ISO 7637-2 Pulse 5a) and alternator ripple-induced spikes. IC Role / Device Role / Timing Role: Bidirectional TVS placed across power input rails to clamp positive and negative excursions before they reach DC/DC controllers or LED drivers. Use Value: Limits voltage to ≤64.5V during 500W surge events, preventing latch-up or permanent damage to 48V-rated buck controllers and maintaining functional safety compliance. | Use Scenario: Shielding 24V digital input modules from inductive kickback when solenoids or relays de-energize. IC Role / Device Role / Timing Role: SA40CA installed at field-side connector to absorb >100A/10ms inductive spikes before reaching optocoupler input stages or microcontroller GPIOs. Use Value: Clamps transients within 5ns to <65V, preserving signal integrity and eliminating false triggering or reset events in real-time control loops. |
| USB-C Port ESD Protection | Smart Meter Communication Interfaces |
Use Scenario: Secondary-level ESD protection on USB-C CC and VCONN lines exposed to human-body-model (HBM) discharges. IC Role / Device Role / Timing Role: Bidirectional TVS placed after primary polymer PTC fuse to handle ±15kV contact discharge per IEC 61000-4-2 without degrading signal bandwidth. Use Value: Sub-1μA leakage at 40V prevents VCONN bias shift; 64.5V clamping avoids exceeding USB PD 3.0 VBUS tolerance during surge recovery. | Use Scenario: Protecting RS-485 transceivers in smart electricity meters from lightning-induced surges on long outdoor data lines. IC Role / Device Role / Timing Role: SA40CA deployed differential-mode across A/B bus lines to suppress common-mode transients coupled onto twisted-pair cabling. Use Value: Withstands repeated 500W surges while maintaining <1pF junction capacitance (per Fig.4 at 1MHz), avoiding signal edge degradation at 10 Mbps data rates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ40CA (Bourns) | Same DO-214AA (SMB) package, 40V VWM, 64.5V VC @ 7.8A; 600W rating; slightly higher IPPM (7.8A vs 8.1A). | Surface-mount alternative requiring PCB redesign; better thermal dissipation in high-density layouts but lacks axial-leaded mechanical robustness. | Select SMBJ40CA only if SMT assembly is mandatory and board space is constrained; otherwise SA40CA offers lower cost and easier manual rework. |
| P6KE40CA (ON Semiconductor) | DO-15 package, same VWM/VC specs, but 600W rating and 8.3A IPPM; higher IR (5μA @ 40V) and no halogen-free claim. | Legacy industrial design support; wider availability in older distributor catalogs but lacks RoHS/halogen-free documentation traceability. | Choose P6KE40CA for drop-in replacement in existing DO-15 footprints where material compliance is not audited; prefer SA40CA for new designs requiring full environmental certification. |
Compared with SMBJ40CA and P6KE40CA, SA40CA provides identical clamping performance in the same DO-15 form factor while offering halogen-free construction and <1μA leakage - making it optimal for next-generation energy metering and automotive lighting where regulatory compliance and low standby current are prioritized.
Availability
SA40CA is available at Aetrix Electronics and suitable for automotive lighting systems, industrial PLC digital I/O modules, and smart meter communication interfaces requiring stable component supply and full RoHS/halogen-free compliance.
Supply support for SA40CA 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 analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, serving global automotive, industrial, and consumer markets since 1979.
The SA Series TVS diodes are engineered specifically for high-reliability transient suppression in harsh environments - emphasizing AEC-Q101 qualification paths, wide temperature operation, and precise clamping consistency across voltage grades.
FAQ
What is the polarity configuration of SA40CA?
The SA40CA is a bidirectional TVS diode with symmetrical terminals - neither lead is designated anode or cathode. It clamps transients of either polarity equally, eliminating orientation concerns during PCB placement and simplifying assembly for differential or floating signal lines.
Does SA40CA meet AEC-Q101 reliability standards?
No, SA40CA does not carry AEC-Q101 qualification. The 'H' suffix (e.g., SA40CAH) indicates AEC-Q101 compliance per the ordering code table. SA40CA shares identical electrical specifications but lacks the extended stress testing required for automotive-grade qualification.
What is the maximum clamping voltage of SA40CA at its rated surge current?
The maximum clamping voltage (VC) of SA40CA is 64.5 V at 8.1 A peak pulse current (IPPM), measured under the standard 10/1000μs waveform. This value defines the upper voltage limit imposed on protected circuitry during a full 500W transient event.
Can SA40CA be used in place of a unidirectional TVS like SA40A?
No - SA40CA is bidirectional and cannot replace unidirectional SA40A in DC-biased applications where forward conduction must be blocked in one direction. SA40A clamps only negative transients; SA40CA clamps both polarities, risking unintended conduction in single-supply rail protection.
What is the junction capacitance of SA40CA and how does it affect high-speed data lines?
SA40CA exhibits typical junction capacitance of <1.5 pF at 1 MHz and 0 V bias (per Fig.4). This ultra-low capacitance ensures minimal signal distortion on high-speed interfaces like RS-485 or CAN FD, preserving edge integrity and bit-error-rate performance up to 25 Mbps.
SA40CA 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:
- 64.5V
- Current - Peak Pulse (10/1000µs):
- 8.1A
- 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)
SA40CA FAQ
1.How can I place an order for SA40CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SA40CA 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 SA40CA reliable?
The price and inventory of SA40CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA40CA is usually 5 days.
3.What payment methods are accepted for SA40CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA40CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA40CA?
SA40CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA40CA 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 SA40CA?
For technical support, including SA40CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA40CA requirements.
6.How does Aetrix verify that SA40CA is sourced from the original manufacturer or authorized distributors?
All SA40CA 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 SA40CA meets industry standards.
7.What is the process for return or replacement of SA40CA?
All SA40CA units undergo pre-shipment inspection (PSI). If there is an issue with SA40CA, 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 SA40CA part is unused and in its original packaging.
Return procedure for SA40CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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