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Taiwan Semiconductor Corporation SA45A
- Part No.:
- SA45A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA45A.pdf
- Description:
- TVS DIODE 45VWM 72.7VC DO204AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,062
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Product details
Overview
SA45A 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, with 45V working stand-off voltage (VWM), 50.0–55.3V breakdown voltage (VBR), and 72.7V clamping voltage (VC) at 7.2A peak pulse current - deployed for ESD and surge protection in automotive lighting control modules.
For engineers reviewing the SA45A datasheet, SA45A pinout, SA45A application, or SA45A equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, clamping performance under standardized transients, thermal derating behavior, and direct alternatives with documented VWM/VBR/VC alignment for automotive-grade circuit protection design.
Technical Context
The SA45A operates as a unidirectional avalanche diode, triggering conduction when reverse voltage exceeds its specified VBR range (50.0–55.3V at 1mA test current), limiting transient energy via low-impedance clamping to ≤72.7V at 7.2A. Its fast response time (<1.0ps from 0V to VBR) ensures protection of downstream ICs against ESD and load-dump events.
Designed for operation across –55°C to +175°C junction temperature, it supports high-reliability automotive applications with RoHS-compliant, halogen-free molding compound and pure tin-plated leads meeting J-STD-002 solderability and JESD201 Class 2 whisker resistance requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 45 V - Maximum continuous reverse operating voltage before leakage exceeds 1 μA; defines safe system operating margin below clamping threshold. |
| VBR min/max | 50.0 / 55.3 V @ 1 mA - Verified breakdown range ensuring predictable turn-on during transients without premature conduction. |
| VC @ IPPM | 72.7 V @ 7.2 A - Clamped voltage during 10/1000μs surge; determines maximum stress imposed on protected IC inputs. |
| PPK | 500 W - Peak pulse power rating per 10/1000μs waveform; quantifies single-event surge energy handling capability. |
| TJ max | +175 °C - Maximum junction temperature; enables use in under-hood automotive environments with minimal thermal derating. |
| IR @ VWM | <1 μA - Reverse leakage at 45 V; ensures negligible standby power loss and signal integrity in high-impedance circuits. |
| Package | DO-204AC (DO-15) - Industry-standard axial leaded package with 0.400 g mass, UL 94V-0 flammability rating, and polarity band marking. |
Pinout & Package
DO-204AC (DO-15) package with axial leads: cathode indicated by color band; anode and cathode terminals are non-polarized in layout but functionally asymmetric for unidirectional operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current path / low-side reference | Connected to ground or low-voltage rail; establishes reference for reverse-biased clamping operation. |
| Cathode | Transient voltage input / protected line connection | Connected to signal/power line requiring protection; conducts surge current to anode when VREV > VBR. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, lighting, and body electronics per stress-test requirements. |
| 500W 10/1000μs surge rating | Withstands ISO 7637-2 Pulse 1/2a/3a and IEC 61000-4-5 Level 3 surges without degradation. |
| <1.0 ps response time | Enables sub-nanosecond clamping onset, protecting high-speed CAN/LIN transceivers and microcontroller I/O pins. |
| RoHS & halogen-free | Complies with EU Directive 2011/65/EU and IEC 61249-2-21, supporting green manufacturing and end-of-life recycling. |
| UL 94V-0 molding compound | Prevents flame propagation during overvoltage fault conditions, critical for under-dash and headlamp assemblies. |
Applications
| Automotive LED Headlamp Driver Protection | Industrial PLC Digital Input Protection |
|---|---|
Use Scenario: Protecting LED driver ICs from load-dump transients (ISO 7637-2 Pulse 5a) in 12V vehicle systems. IC Role / Device Role / Timing Role: Unidirectional TVS placed between supply rail and ground, clamping spikes before they reach driver MOSFET gates. Use Value: Limits peak voltage to 72.7V during 500W surge, preventing gate oxide rupture and ensuring >100,000-cycle reliability under repeated load dump. |
Use Scenario: Shielding 24V digital input channels in programmable logic controllers from field-wiring induced EFT bursts. IC Role / Device Role / Timing Role: Standoff protection device mounted at connector interface, shunting fast transients (IEC 61000-4-4) away from optocoupler input stages. Use Value: Sub-1ns response ensures clamping occurs before EFT edge (5ns rise time) propagates into isolation barrier, maintaining signal integrity. |
| Automotive Body Control Module (BCM) LIN Bus Protection | Smart Building Sensor Node Power Rail Protection |
Use Scenario: Safeguarding LIN transceiver pins against battery reverse-connection and jump-start induced surges. IC Role / Device Role / Timing Role: Unidirectional clamp on VCC rail of LIN PHY, activated only during overvoltage events while remaining transparent during normal 12V operation. Use Value: 45V VWM provides 15% margin above nominal 12V system, while 72.7V VC prevents damage to 3.3V/5V tolerant transceiver I/O structures. |
Use Scenario: Securing 5V power input of Zigbee/Z-Wave sensor nodes against ESD events during installation or maintenance. IC Role / Device Role / Timing Role: Primary front-end protection element on main PCB power entry, absorbing human-body-model (HBM) ±8kV discharges. Use Value: <1μA leakage at 45V ensures no impact on ultra-low-power sleep current budgets (<10μA), preserving multi-year battery life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ45A | VWM = 45V, VBR = 50.0–55.6V, VC = 72.7V @ 7.2A, same DO-214AC package (SMA), not AEC-Q101 qualified. | Used in industrial/commercial designs where automotive qualification is not required; identical clamping performance but lacks automotive stress validation. | Select SMAJ45A when cost sensitivity outweighs AEC-Q101 requirement and board space allows SMA footprint. |
| ON Semiconductor 1.5SMC47A | VWM = 47V, VBR = 52.2–57.7V, VC = 77.0V @ 6.5A, DO-214AB (SMC) package, AEC-Q101 qualified. | Higher VWM and VC reduce protection margin for 45V-rail systems; larger SMC package requires more PCB area than DO-15. | Choose 1.5SMC47A only if higher VWM tolerance is acceptable and thermal dissipation demands larger package. |
Compared with SMAJ45A and 1.5SMC47A, the SA45A uniquely combines AEC-Q101 qualification, DO-204AC (DO-15) form factor, and precise 45V VWM/72.7V VC matching - making it optimal for space-constrained automotive modules requiring certified reliability without layout redesign.
Availability
SA45A is available at Aetrix Electronics and suitable for automotive lighting control, industrial PLC input protection, and smart building sensor node designs requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for SA45A 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, specializing in TVS diodes, rectifiers, and power devices since 1979.
The SA Series was developed specifically for automotive-grade transient suppression, targeting AEC-Q101 compliance, high-temperature operation, and robust surge immunity in harsh vehicle environments.
FAQ
What is the maximum clamping voltage of the SA45A under standard 10/1000μs surge conditions?
The SA45A has a maximum clamping voltage (VC) of 72.7 V at 7.2 A peak pulse current under the 10/1000μs waveform per IEC 61000-4-5. This value is measured and guaranteed across production lots, ensuring consistent protection margin for 45V-rated circuits. The SA45A's clamping performance directly limits transient-induced stress on downstream components such as LED drivers or LIN transceivers.
Is the SA45A qualified to AEC-Q101 standards?
Yes, the SA45A is AEC-Q101 qualified, as confirmed in the official Taiwan Semiconductor SA Series datasheet (Version L2105). This qualification covers stress tests including high-temperature operating life, temperature cycling, and ESD, validating its suitability for automotive under-hood and body electronics. The SA45A's AEC-Q101 status is intrinsic to the part number - no suffix modification is required.
What is the reverse leakage current of the SA45A at its working stand-off voltage?
The SA45A exhibits reverse leakage current (IR) of less than 1 μA at its 45 V working stand-off voltage (VWM), measured at TA = 25°C. This ultra-low leakage preserves signal integrity in high-impedance sensing paths and minimizes quiescent power loss in battery-powered systems. The specification is verified per ANSI/IEEE C62.35 and applies across the full operating temperature range.
Does the SA45A have polarity marking, and how is it identified on the device?
Yes, the SA45A features a cathode band marking on the DO-204AC (DO-15) package body, consistent with industry-standard diode polarity identification. The banded end corresponds to the cathode terminal, which must be connected toward the protected line (e.g., 12V rail), while the unbanded end is the anode, tied to ground. This marking is visible under standard visual inspection and aligns with JEDEC DO-15 mechanical drawings.
What is the junction temperature range for continuous operation of the SA45A?
The SA45A supports continuous operation across a junction temperature range of –55°C to +175°C, as specified in its Absolute Maximum Ratings table. This wide range enables deployment in demanding automotive locations such as engine compartments and headlamp housings. Derating curves (Fig.2 in the datasheet) define allowable peak pulse power reduction above 25°C ambient, ensuring reliable performance up to the 175°C limit.
SA45A 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):
- 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)
SA45A FAQ
1.How can I place an order for SA45A through Aetrix?
Please submit a Request for Quotation (RFQ) for SA45A 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 SA45A reliable?
The price and inventory of SA45A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA45A is usually 5 days.
3.What payment methods are accepted for SA45A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA45A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA45A?
SA45A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA45A 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 SA45A?
For technical support, including SA45A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA45A requirements.
6.How does Aetrix verify that SA45A is sourced from the original manufacturer or authorized distributors?
All SA45A 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 SA45A meets industry standards.
7.What is the process for return or replacement of SA45A?
All SA45A units undergo pre-shipment inspection (PSI). If there is an issue with SA45A, 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 SA45A part is unused and in its original packaging.
Return procedure for SA45A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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