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Taiwan Semiconductor Corporation SA40CAH
- Part No.:
- SA40CAH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA40CAH.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO204AC
- Quantity:
- Payment:
- Shipping:
Inventory:8,690
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Product details
Overview
SA40CAH from Taiwan Semiconductor is a bidirectional 40V transient voltage suppressor (TVS) diode in DO-204AC (DO-15) package, rated for 500W peak pulse power at 10/1000μs, with 64.4V min / 78.7V max breakdown voltage, 1μA max reverse leakage at 40V, and 7.3A max peak pulse current. It protects automotive and industrial control circuits against ESD and inductive switching transients.
For engineers reviewing the SA40CAH datasheet, SA40CAH pinout, SA40CAH application, or SA40CAH equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, clamping performance under standardized surge waveforms, and real-world use context for circuit-level overvoltage protection design.
Technical Context
The SA40CAH is a bidirectional TVS diode designed to clamp transient voltages symmetrically in both polarities, enabling robust protection without polarity sensitivity. Its breakdown voltage range (64.4–78.7V) ensures reliable triggering above the 40V working stand-off voltage while maintaining low clamping voltage (≤103V at 7.3A).
It operates across –55°C to +175°C junction temperature, supports fast response (<5ns), and meets AEC-Q101 stress test requirements for automotive applications. The device uses silicon PN-junction technology with pure tin-plated leads compliant with J-STD-002 solderability standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - Maximum continuous DC or RMS operating voltage before conduction begins |
| VBR (min/max) | 64.4 V / 78.7 V - Breakdown initiates within this range at 1 mA test current; defines turn-on threshold margin |
| VC @ IPPM | 103 V - Clamped voltage at 7.3 A peak pulse current; determines maximum stress on protected IC |
| PPK | 500 W - Peak pulse power handling per 10/1000 μs waveform; validates surge immunity level |
| IR @ VWM | <1 μA - Reverse leakage at 40 V; ensures minimal standby power loss and signal integrity |
| TJ max | +175 °C - Maximum junction temperature; enables operation in under-hood automotive environments |
| Package | DO-204AC (DO-15) - Industry-standard axial leaded package with 0.400 g mass and UL 94V-0 molding compound |
Pinout & Package
SA40CAH is a two-terminal bidirectional TVS diode housed in a DO-204AC (DO-15) axial package. Polarity is not applicable; terminals are non-polarized and interchangeable. Cathode band marking is omitted per bidirectional configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient conduction path | Provides identical clamping behavior in either direction; connects across protected line and ground or between differential lines |
| Leads (Tin-plated) | PCB interface and thermal path | Enables hand-soldering and reflow per J-STD-002; contributes to thermal dissipation during surge events |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per JEDEC standards |
| 500W 10/1000μs surge rating | Withstands high-energy transients common in 12V/24V vehicle systems and industrial motor drives |
| Bidirectional clamping | Protects AC-coupled or floating signal lines without requiring polarity-aware layout |
| Fast response time <5 ns | Engages before sensitive downstream components experience damaging overvoltage |
| RoHS and halogen-free | Complies with IEC 61249-2-21 and EU RoHS Directive for environmentally constrained designs |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting LIN bus or 12V supply rail in engine control units from load dump and ISO 7637-2 pulses. IC Role / Device Role: Primary overvoltage clamp placed between power input and local regulator or microcontroller. Use Value: Limits transient voltage to ≤103V, preventing latch-up or permanent damage to 40V-rated regulators and CAN/LIN transceivers. | Use Scenario: Safeguarding analog front-end inputs of pressure or temperature sensors exposed to EFT bursts in factory automation PLCs. IC Role / Device Role: Low-capacitance shunt protector mounted directly at connector entry point. Use Value: Maintains signal fidelity with <1μA leakage at 40V and clamps EFT-induced spikes before they reach precision ADC inputs. |
| LED Driver Output Protection | DC Motor Control Feedback Line Protection |
Use Scenario: Shielding constant-current LED driver outputs from inductive kickback when driving high-brightness lighting arrays. IC Role / Device Role: Bidirectional TVS placed across output terminals to absorb reverse EMF energy. Use Value: Handles repetitive 500W surges without degradation, preserving LED driver MOSFET lifetime and optical stability. | Use Scenario: Protecting hall-effect sensor feedback lines in BLDC motor controllers subjected to commutation noise and back-EMF coupling. IC Role / Device Role: Symmetrical transient suppressor bridging sensor supply and ground near motor housing. Use Value: Ensures uninterrupted rotor position sensing by clamping coupled transients to safe levels below sensor IC absolute maximum ratings. |
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 | DO-214AA (SMB) package; 400W rating; 64.4–78.7V VBR; 103V VC @ 7.2A | Surface-mount footprint; lower thermal mass; less suited for high-reliability through-hole layouts | Select SMBJ40CA only if board space constraints require SMT and thermal derating is acceptable |
| P6KE40CA | DO-15 package; 600W rating; 64.4–78.7V VBR; 103V VC @ 8.3A; no AEC-Q101 qualification | Higher surge capacity but unqualified for automotive; broader availability in legacy industrial stock | Choose P6KE40CA for cost-sensitive non-automotive applications where AEC-Q101 is not mandated |
Compared with SMBJ40CA and P6KE40CA, SA40CAH uniquely combines AEC-Q101 qualification, DO-15 through-hole robustness, and precise 500W/40V system-level coordination-making it optimal for automotive body electronics and industrial control modules requiring long-term reliability validation.
Availability
SA40CAH is available at Aetrix Electronics and suitable for automotive power distribution, industrial sensor interfaces, LED driver protection, and DC motor control feedback circuits requiring stable component supply and traceable sourcing.
Supply support for SA40CAH 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 thyristors, with global manufacturing and quality certifications.
The SA Series is engineered specifically for high-reliability transient suppression in automotive and industrial environments, emphasizing AEC-Q101 compliance, tight parameter tolerances, and robust surge endurance in axial-leaded packages.
FAQ
What is the breakdown voltage range for SA40CAH?
The SA40CAH has a minimum breakdown voltage (VBR) of 64.4 V and a maximum of 78.7 V at 1 mA test current, measured per ANSI/IEEE C62.35. This range ensures consistent turn-on behavior above its 40 V working stand-off voltage while accommodating process variation. The SA40CAH datasheet specifies these values under standard test conditions (TA = 25°C), and the device maintains this performance across its full operating temperature range.
Is SA40CAH suitable for automotive applications?
Yes, SA40CAH is AEC-Q101 qualified, meaning it has passed rigorous stress tests including high-temperature reverse bias, temperature cycling, and ESD robustness required for automotive electronic modules. Its –55°C to +175°C operating junction temperature range and DO-204AC mechanical construction make SA40CAH appropriate for under-hood and body-control unit deployments where reliability under thermal and electrical stress is critical.
What does the "CA" suffix indicate in SA40CAH?
The "CA" suffix in SA40CAH denotes bidirectional configuration-meaning the device provides symmetrical transient suppression in both forward and reverse directions. Unlike unidirectional variants (e.g., SA40AH), SA40CAH has no cathode marking and functions identically regardless of voltage polarity, making it ideal for AC-coupled lines, differential buses, or floating supply rails where polarity cannot be guaranteed.
How does SA40CAH compare to SA40A in terms of clamping performance?
SA40CAH and SA40A share identical electrical specifications-including VBR (64.4–78.7 V), VC (103 V at 7.3 A), and PPK (500 W)-but differ in configuration and qualification. SA40A is unidirectional and not AEC-Q101 qualified, whereas SA40CAH is bidirectional and AEC-Q101 qualified. Therefore, SA40CAH delivers the same clamping performance with added automotive-grade reliability and polarity-agnostic protection capability.
What packaging options are available for SA40CAH?
SA40CAH is supplied in DO-204AC (DO-15) package with two standard packing formats: 3,500 units per tape-and-reel (ordering code SA40CAH) and 1,500 units per ammo box (ordering code SA40CAHA0G). Both options feature pure tin-plated leads compliant with J-STD-002 solderability requirements and UL 94V-0 flame-retardant molding compound, ensuring compatibility with automated assembly and high-reliability end-use environments.
SA40CAH 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:
- -
- 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)
SA40CAH FAQ
1.How can I place an order for SA40CAH through Aetrix?
Please submit a Request for Quotation (RFQ) for SA40CAH 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 SA40CAH reliable?
The price and inventory of SA40CAH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA40CAH is usually 5 days.
3.What payment methods are accepted for SA40CAH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA40CAH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA40CAH?
SA40CAH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA40CAH 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 SA40CAH?
For technical support, including SA40CAH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA40CAH requirements.
6.How does Aetrix verify that SA40CAH is sourced from the original manufacturer or authorized distributors?
All SA40CAH 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 SA40CAH meets industry standards.
7.What is the process for return or replacement of SA40CAH?
All SA40CAH units undergo pre-shipment inspection (PSI). If there is an issue with SA40CAH, 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 SA40CAH part is unused and in its original packaging.
Return procedure for SA40CAH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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