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Taiwan Semiconductor Corporation SA45CA
- Part No.:
- SA45CA
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA45CA.pdf
- Description:
- TVS DIODE 45VWM 72.7VC DO204AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,180
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Product details
Overview
SA45CA 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 45V working stand-off voltage (VWM), 50.0–61.1V breakdown voltage (VBR), and 80.3V maximum clamping voltage (VC) at 6.5A peak pulse current-designed for ESD and electrical fast transient protection in automotive lighting control modules.
For engineers reviewing the SA45CA datasheet, SA45CA pinout, SA45CA application, or SA45CA equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification status, DO-15 mechanical compatibility, low leakage (<1μA @ 45V), and thermal stability up to +175°C junction temperature.
Technical Context
The SA45CA operates as a bidirectional avalanche diode, symmetrically clamping transients in both polarities without polarity dependence. Its VBR range (50.0–61.1V) and VC of 80.3V at IPPM = 6.5A define its surge-handling envelope under standardized 10/1000μs waveform conditions.
It features ultra-fast response time (<5.0ns for bidirectional mode), low dynamic impedance, and meets JESD201 Class 2 whisker resistance. The device is qualified to AEC-Q101, confirming suitability for automotive-grade transient suppression where reliability under thermal cycling and vibration is critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 45 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 50.0 / 61.1 V - Breakdown voltage range at 1 mA test current; defines turn-on threshold consistency |
| VC @ IPPM | 80.3 V - Clamping voltage at 6.5 A peak pulse current; determines protected circuit's max transient exposure |
| PPK | 500 W - Peak pulse power rating per 10/1000μs waveform; defines single-event surge robustness |
| TJ max | +175 °C - Maximum junction temperature; enables operation in under-hood automotive environments |
| IR @ VWM | <1 μA - Reverse leakage at 45 V; ensures minimal standby power loss and signal integrity |
| Package | DO-204AC (DO-15) - Industry-standard axial leaded package with 0.400 g mass and UL 94V-0 molding compound |
Pinout & Package
DO-204AC (DO-15) package: axial-leaded, molded plastic case with cathode band marking for unidirectional variants; SA45CA is bidirectional and has no polarity marking-both terminals are electrically symmetrical.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional avalanche junction | Either terminal serves as anode or cathode depending on transient polarity; no fixed polarity required in PCB layout |
| Lead 1 | Terminal connection | Tin-plated copper lead, solderable per J-STD-002; supports manual and wave soldering |
| Lead 2 | Terminal connection | Identical to Lead 1; enables placement flexibility and eliminates orientation constraints |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including temperature cycling, mechanical shock, and humidity testing |
| Bidirectional clamping | Enables single-device protection against positive and negative transients without external polarity management |
| 500W 10/1000μs surge rating | Withstands high-energy load dump and inductive switching events common in 12V/24V vehicle systems |
| <5.0 ns response time | Clamps ESD and EFT transients before sensitive IC inputs are damaged |
| RoHS & halogen-free | Complies with IEC 61249-2-21 and environmental directives for automotive supply chain traceability |
Applications
| Automotive Lighting Control | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting LED driver ICs and microcontroller GPIOs from load-dump spikes and relay coil flyback in headlamp modules. IC Role / Device Role / Timing Role: Bidirectional TVS placed across power rail and ground near connector entry point to clamp ±100V transients within 5 ns. Use Value: Prevents latch-up or gate oxide damage in 45V-rated drivers by limiting transient voltage to ≤80.3V at 6.5A surge. | Use Scenario: Safeguarding 24V digital input channels in programmable logic controllers exposed to field wiring surges. IC Role / Device Role / Timing Role: Standoff voltage (45V) exceeds nominal 24V bus while allowing margin for ripple; clamps fast EFT bursts per IEC 61000-4-4. Use Value: Maintains signal integrity during 4 kV EFT testing by holding line-to-ground voltage below 80.3V without degradation over 10,000 pulses. |
| Automotive Body Control Module | Smart Sensor Interface Protection |
Use Scenario: Shielding LIN bus transceivers and window motor drivers from battery reversal and jump-start transients. IC Role / Device Role / Timing Role: Placed on VBAT-supplied rails upstream of LDOs; clamps bidirectional overvoltage events without polarity dependency. Use Value: Enables use of single SA45CA instead of dual unidirectional devices, reducing BOM count and PCB area in space-constrained BCM designs. | Use Scenario: Protecting analog front-end inputs of automotive pressure or position sensors connected to long harnesses. IC Role / Device Role / Timing Role: Low leakage (<1 μA) avoids loading sensor output; DO-15 package fits standard through-hole footprint for legacy sensor modules. Use Value: Preserves measurement accuracy by minimizing DC offset error while suppressing 8 kV contact ESD per ISO 10605. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ45A | Unidirectional; 45V VWM, 73V VC @ 6.3A; SMA package (surface-mount) | Requires external polarity handling; not suitable for bidirectional surge paths without added components | Select when board space is constrained and only unidirectional transients occur |
| P6SMB45CA | Bidirectional; 45V VWM, 73.5V VC @ 6.8A; DO-214AA (SMB) package | Higher clamping voltage margin (+13.5V vs SA45CA); larger footprint than DO-15 but higher surge current rating | Select when higher IPPM tolerance (6.8A vs 6.5A) and SMB mounting are preferred over axial leads |
Compared with SMAJ45A and P6SMB45CA, the SA45CA offers lower clamping voltage (80.3V), AEC-Q101 qualification out-of-box, and DO-15 mechanical compatibility-making it optimal for cost-sensitive, through-hole automotive modules requiring verified bidirectional robustness.
Availability
SA45CA is available at Aetrix Electronics and suitable for automotive lighting control, industrial PLC I/O protection, and body control module designs requiring stable component supply, AEC-Q101 compliance, and DO-15 package compatibility.
Supply support for SA45CA 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 TVS diodes are engineered for high-reliability transient suppression in harsh environments, with emphasis on AEC-Q101 qualification, tight parameter distribution, and robust surge endurance-targeting automotive subsystems and industrial controls.
FAQ
What is the clamping voltage of SA45CA and how is it measured?
The SA45CA has a maximum clamping voltage (VC) of 80.3 V, measured at 6.5 A peak pulse current (IPPM) using the standardized 10/1000 μs double-exponential surge waveform. This value represents the upper limit of voltage seen by downstream circuitry during a worst-case transient event, ensuring protection for 45V-rated components. The SA45CA maintains this clamping performance across its full operating temperature range from –55°C to +175°C.
Is SA45CA unidirectional or bidirectional, and how does that affect PCB layout?
The SA45CA is a bidirectional TVS diode, meaning it provides symmetrical clamping for both positive and negative transients without polarity sensitivity. Unlike unidirectional variants (e.g., SA45), the SA45CA has no cathode band marking and can be mounted in either orientation on the PCB. This simplifies layout, eliminates orientation verification steps in manufacturing, and reduces risk of misplacement in high-volume automotive assembly.
Does SA45CA meet AEC-Q101 requirements, and what tests does that include?
Yes, the SA45CA is AEC-Q101 qualified-specifically the "H" variant in the SA Series ordering code (e.g., SA45CAH). This qualification includes stress testing for temperature cycling, high-temperature operating life, unbiased highly accelerated stress test (uHAST), mechanical shock, and solder heat resistance. These tests validate reliability for automotive under-hood and cabin applications where thermal and mechanical durability are critical.
What is the maximum steady-state power dissipation for SA45CA at elevated temperatures?
The SA45CA has a steady-state power dissipation (PD) of 3 W when mounted on 10 × 10 mm copper pads per lead at TL = 75°C. Derating applies above 25°C ambient per the pulse derating curve (Fig.2 in datasheet), with usable PD dropping to ~1.5 W at TA = 100°C. This thermal profile supports continuous operation in engine-control units and lighting modules where ambient temperatures exceed 85°C.
How does SA45CA compare to SA45 in terms of electrical performance and application use?
The SA45CA differs from SA45 in being bidirectional (vs unidirectional), resulting in identical VBR (50.0–61.1 V) and VC (80.3 V) specs but with symmetrical behavior. SA45 requires correct cathode orientation and protects only one polarity unless paired; SA45CA replaces such pairs in applications like LIN bus or differential sensor lines. Both share DO-204AC packaging, AEC-Q101 qualification, and 500W surge rating-but SA45CA is mandatory where bipolar transients are present.
SA45CA 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):
- 45V
- Voltage - Breakdown (Min):
- 50V
- Voltage - Clamping (Max) @ Ipp:
- 72.7V
- Current - Peak Pulse (10/1000µs):
- 7.2A
- 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)
SA45CA FAQ
1.How can I place an order for SA45CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SA45CA 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 SA45CA reliable?
The price and inventory of SA45CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA45CA is usually 5 days.
3.What payment methods are accepted for SA45CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA45CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA45CA?
SA45CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA45CA 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 SA45CA?
For technical support, including SA45CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA45CA requirements.
6.How does Aetrix verify that SA45CA is sourced from the original manufacturer or authorized distributors?
All SA45CA 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 SA45CA meets industry standards.
7.What is the process for return or replacement of SA45CA?
All SA45CA units undergo pre-shipment inspection (PSI). If there is an issue with SA45CA, 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 SA45CA part is unused and in its original packaging.
Return procedure for SA45CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SA45CA Tags
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