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Taiwan Semiconductor Corporation SA40AH
- Part No.:
- SA40AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA40AH.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO204AC
- Quantity:
- Payment:
- Shipping:
Inventory:3,023
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Product details
Overview
SA40AH from Taiwan Semiconductor is a unidirectional AEC-Q101-qualified 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 (VWM), and clamps to ≤71.4V at 7.3A peak pulse current. It delivers fast response (<1.0ps from 0V to VBR) and low leakage (<1μA @ 40V), designed for automotive-grade ESD and load-dump protection in power supply rails and signal lines.
For engineers reviewing the SA40AH datasheet, SA40AH pinout, SA40AH application, or SA40AH equivalent, this page provides verified electrical parameters, DO-15 terminal polarity mapping, automotive-grade reliability data, clamping performance under IEC 61000-4-5 surge conditions, and validated alternatives for 40V stand-off TVS selection in harsh-environment electronics.
Technical Context
The SA40AH operates as a unidirectional avalanche diode with precisely controlled breakdown voltage (VBR = 44.4–54.3V @ 1mA), enabling robust overvoltage clamping during transients while maintaining low leakage below VWM. Its junction design supports 175°C maximum operating temperature and meets JESD201 Class 2 whisker resistance.
It complies with AEC-Q101 stress test requirements including HTGB, HTRB, and TCT, and features pure tin-plated leads solderable per J-STD-002. The device is not bidirectional - polarity is marked by cathode band, and forward conduction is limited to 3.5V @ 35A peak surge.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - Maximum continuous reverse voltage before clamping begins; defines safe operating margin for 36V nominal automotive systems. |
| VBR min/max | 44.4 / 54.3 V @ 1 mA - Confirmed breakdown range ensures reliable turn-on during transients without premature conduction. |
| VC @ IPPM | 71.4 V @ 7.3 A - Clamping voltage under 10/1000μs surge; limits downstream IC stress to <72V during ISO 7637-2 Pulse 5a. |
| PPK | 500 W - Peak pulse power rating at TA = 25°C; derates linearly above 25°C per Fig.2 in datasheet. |
| IR @ VWM | <1 μA - Ultra-low reverse leakage preserves battery drain budget in always-on vehicle modules. |
| TJ max | 175 °C - Enables placement near high-temperature engine-control units without thermal derating. |
| Package | DO-204AC (DO-15) - Industry-standard axial leaded package with 0.400g mass and UL 94V-0 molding compound. |
Pinout & Package
DO-204AC (DO-15) package with axial leads; cathode identified by molded band. Leads are pure tin-plated, compliant with J-STD-002 solderability and JESD201 Class 2 whisker resistance. Mounting requires 10×10 mm copper pads per terminal for full 3W steady-state dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Ground reference terminal | Connected to system ground or low-side return path; carries full surge current during clamping. |
| Cathode | Protected line input | Connected to protected node (e.g., 12V rail); voltage referenced to anode; marked by molded band. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive underhood applications including temperature cycling, humidity bias, and mechanical shock per Rev L2105. |
| Clamping ratio VC/VBR | ≤1.60 (71.4V / 44.4V) - Tight ratio ensures predictable overvoltage limiting without excessive margin overhead. |
| Response time | <1.0 ps - Sub-picosecond turn-on enables protection of high-speed CAN/LIN transceivers against ESD events. |
| RoHS & halogen-free | Compliant with IEC 61249-2-21 and EU RoHS Directive 2011/65/EU - suitable for green manufacturing and end-of-life recycling. |
| Surge robustness | Withstands 70A non-repetitive forward surge (8.3ms half-sine) - protects against alternator load dump in 12V systems. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: 12V battery feed to body control module exposed to ISO 7637-2 Pulse 5a (load dump) and ESD ±15kV contact discharge. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and DC-DC input, clamping transients before they reach regulator ICs. Use Value: Limits peak voltage to ≤71.4V, preventing damage to 40V-rated input capacitors and enabling use of cost-optimized 63V input stages. | Use Scenario: 24V industrial PLC analog input channel subject to field-wiring induced surges and EFT bursts per IEC 61000-4-4. IC Role / Device Role / Timing Role: Standoff protector on front-end op-amp supply rail, absorbing energy before it reaches precision ADC driver circuitry. Use Value: Maintains <1μA leakage at 24V operation, avoiding offset drift in microvolt-level measurement paths. |
| LED Driver Overvoltage Clamp | Automotive LIN Bus Line Protection |
Use Scenario: Constant-current LED driver in headlamp module subjected to back-EMF from inductive ballast switching. IC Role / Device Role / Timing Role: Parallel-connected TVS across driver output to clamp inductive kickback spikes. Use Value: 500W surge rating handles repetitive 10/1000μs transients up to 4x per minute without degradation. | Use Scenario: LIN transceiver bus line exposed to ESD events during connector mating/unmating in door module assemblies. IC Role / Device Role / Timing Role: Bidirectional protection is not used; SA40AH serves as unidirectional clamp from LIN line to ground, suppressing negative-going transients. Use Value: <1.0ps response ensures clamping occurs before LIN physical layer IC enters latch-up, preserving communication integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ40A | Same DO-214AC package; VBR = 44.4–49.1V; VC = 64.5V @ 7.7A; lower clamping voltage but no AEC-Q101 qualification. | Preferred for commercial-industrial designs where automotive qualification is not required; higher IPPM allows longer surge duration handling. | Select SMAJ40A when AEC-Q101 is unnecessary and lower clamping voltage improves system margin. |
| P6SMB40A | DO-214AA package; VBR = 44.4–49.1V; VC = 64.5V @ 7.7A; same electrical specs but different mechanical footprint and thermal pad layout. | Used where board space constraints favor SMB over DO-15; requires PCB redesign due to different lead spacing and thermal pad area. | Select P6SMB40A only if DO-214AA footprint is already standardized in the design and thermal management permits. |
Compared with SMAJ40A and P6SMB40A, SA40AH provides AEC-Q101 validation and DO-15 axial form factor ideal for through-hole automotive harness interfaces, while trading slightly higher clamping voltage for proven under-hood reliability and legacy compatibility.
Availability
SA40AH is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface hardening, and LED driver overvoltage clamping requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SA40AH 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 for automotive and industrial markets.
The SA Series was developed specifically for AEC-Q101-compliant transient suppression in 12V/24V automotive subsystems, emphasizing high-temperature stability, low leakage, and repeatable clamping performance under real-world surge waveforms.
FAQ
What is the AEC-Q101 qualification status of SA40AH?
The SA40AH is explicitly qualified to AEC-Q101 Rev D standards, including stress tests for high-temperature reverse bias (HTGB), high-temperature operating life (HTOL), temperature cycling (TC), and mechanical shock. This qualification is documented in Version L2105 of the SA Series datasheet and confirmed in Taiwan Semiconductor's official AEC-Q101 certificate listing. SA40AH is intended for under-hood automotive applications where reliability at 175°C junction temperature is mandatory.
Does SA40AH support bidirectional transient suppression?
No, SA40AH is a unidirectional TVS diode. Its electrical characteristics - including breakdown voltage, clamping behavior, and forward voltage - apply only in reverse-biased mode (cathode positive relative to anode). For bidirectional protection, Taiwan Semiconductor offers the SA40A variant (with "A" suffix), which has symmetrical breakdown in both directions. The SA40AH marking includes a cathode band, confirming its unidirectional polarity and prohibiting use in AC-coupled or differential line protection without external circuitry.
What is the maximum clamping voltage of SA40AH under standard 10/1000μs surge conditions?
The maximum clamping voltage (VC) of SA40AH is 71.4 V at 7.3 A peak pulse current (IPPM), measured per IEC 61000-4-5 10/1000μs waveform. This value is guaranteed across the full operating temperature range (−55°C to +175°C) and represents the upper limit of voltage seen by downstream circuitry during worst-case surge events. It is derived directly from the "Maximum clamping voltage VC@IPPM" row in the SA Series datasheet Table for SA40A (L2105, Page 3).
How does SA40AH compare to SA40A in terms of electrical performance and application use?
SA40AH and SA40A share identical VBR (44.4–49.1 V), VWM (40 V), and VC (64.5 V) specifications, but differ in qualification and directionality: SA40AH is AEC-Q101-qualified and unidirectional, while SA40A is bidirectional but not automotive-qualified. SA40AH's "H" suffix denotes AEC-Q101 compliance and excludes bidirectional capability. Therefore, SA40AH is selected for automotive 12V rail clamping where polarity is fixed and qualification is mandatory, whereas SA40A suits commercial bidirectional interfaces like USB or RS-485.
What packaging options are available for SA40AH?
SA40AH is supplied in tape-and-reel format: 3,500 units per reel (ordering code SA40AH). The DO-204AC (DO-15) package uses axial leads with cathode band marking, pure tin plating per J-STD-002, and UL 94V-0 mold compound. No ammo pack or bulk option is designated for the "H" suffix variant - only SA40A0G and SA40HA0G exist for ammo box packaging, per the Ordering Information table in L2105 revision.
SA40AH 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:
- 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)
SA40AH FAQ
1.How can I place an order for SA40AH through Aetrix?
Please submit a Request for Quotation (RFQ) for SA40AH 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 SA40AH reliable?
The price and inventory of SA40AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA40AH is usually 5 days.
3.What payment methods are accepted for SA40AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA40AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA40AH?
SA40AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA40AH 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 SA40AH?
For technical support, including SA40AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA40AH requirements.
6.How does Aetrix verify that SA40AH is sourced from the original manufacturer or authorized distributors?
All SA40AH 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 SA40AH meets industry standards.
7.What is the process for return or replacement of SA40AH?
All SA40AH units undergo pre-shipment inspection (PSI). If there is an issue with SA40AH, 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 SA40AH part is unused and in its original packaging.
Return procedure for SA40AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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