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Taiwan Semiconductor Corporation SA45
- Part No.:
- SA45
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA45.pdf
- Description:
- 500W, 55.6V, UNIDIRECTIONAL, TVS
- Quantity:
- Payment:
- Shipping:
Inventory:8,002
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Product details
Overview
SA45 from Taiwan Semiconductor is a unidirectional 500W transient voltage suppressor (TVS) diode in DO-204AC (DO-15) package, with 45V working stand-off voltage (VWM), 50.0–61.1V breakdown voltage (VBR @ 1mA), and 80.3V maximum clamping voltage (VC) at 6.5A peak pulse current. It protects automotive and industrial power rails against ESD, EFT, and inductive switching transients.
For engineers reviewing the SA45 datasheet, SA45 pinout, SA45 application, or SA45 equivalent, this page delivers verified electrical parameters, clamping performance under 10/1000μs surge, thermal limits (TJ max = 175°C), polarity marking, and AEC-Q101 qualification status - all critical for robust overvoltage protection design in 12V/24V systems.
Technical Context
The SA45 operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its VBR range (50.0–61.1V). Its low dynamic impedance enables fast clamping (<1.0ps response from 0V to VBR), limiting transient energy delivered to downstream circuitry.
It sustains 500W non-repetitive peak pulse power per 10/1000μs waveform, with derating above 25°C ambient per Fig.2. Steady-state power dissipation is 3W at TL = 75°C on 10×10 mm copper pads, and reverse leakage remains <1μA at 45V.
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 @ 1 mA - Ensures reliable turn-on within defined tolerance band under standard test conditions |
| VC @ IPPM | 80.3 V @ 6.5 A - Clamped voltage during 10/1000μs surge; defines worst-case stress on protected IC |
| PPK | 500 W - Peak surge power handling capability per single 10/1000μs pulse |
| TJ max | 175 °C - Maximum junction temperature; supports operation in under-hood automotive environments |
| IR @ VWM | <1 μA - Negligible leakage at rated stand-off voltage, minimizing standby power loss |
| Package | DO-204AC (DO-15) - Industry-standard axial leaded package with cathode band marking |
Pinout & Package
DO-204AC (DO-15) package: axial-leaded, molded epoxy case with cathode band marking for unidirectional polarity. Leads are pure tin plated, solderable per J-STD-002, and meet JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Ground reference terminal | Connected to system ground; forms return path during clamping event |
| Cathode | Protected line input | Connected to line being protected (e.g., 12V rail); cathode band identifies this terminal |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, body electronics, and infotainment power rails |
| 500W 10/1000μs surge rating | Withstands ISO 7637-2 Pulse 1/2a/3a and IEC 61000-4-5 Level 3 surges without degradation |
| Clamping voltage ≤80.3V | Keeps downstream 48V-tolerant interface ICs (e.g., CAN transceivers, LIN drivers) within safe operating area |
| Fast response time <1.0ps | Activates before most semiconductor junctions experience avalanche failure during ESD events |
| RoHS & halogen-free | Complies with IEC 61249-2-21 and EU RoHS Directive 2011/65/EU for green manufacturing |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: 12V battery line in engine control unit exposed to load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS clamps positive transients while blocking reverse leakage during normal operation. Use Value: Limits voltage to ≤80.3V during 500W surge, protecting MCU power supply and CAN transceiver inputs. | Use Scenario: 24V analog sensor signal line in factory automation PLC I/O module. IC Role / Device Role / Timing Role: Standoff voltage of 45V ensures immunity to normal operating noise while responding to EFT bursts. Use Value: Sub-1μA leakage avoids DC offset errors in precision 4–20mA loop receivers. |
| LED Driver Overvoltage Clamp | DC-DC Converter Input Protection |
Use Scenario: Constant-current LED driver input subjected to inductive kickback from relay coils. IC Role / Device Role / Timing Role: Absorbs stored inductive energy via avalanche conduction, preventing MOSFET gate oxide rupture. Use Value: 6.5A peak pulse current rating handles typical 12V relay coil discharge without thermal runaway. | Use Scenario: 48V input stage of isolated DC-DC converter in telecom power supply. IC Role / Device Role / Timing Role: First-line defense against conducted surges entering via front-end rectifier. Use Value: 175°C max junction temperature allows placement near hot power components without derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ45A | Bidirectional; VBR = 50.0–55.3V; VC = 72.7V @ 7.2A; SMB package (surface-mount) | Supports bidirectional transients (e.g., AC-coupled lines); requires PCB rework for SMT layout | Select SMBJ45A only if bidirectional protection or space-constrained PCB layout is required. |
| P6KE45A | Unidirectional; VBR = 47.8–52.8V; VC = 69.4V @ 7.5A; DO-15 package; no AEC-Q101 qualification | Lacks automotive qualification; lower clamping voltage but wider VBR tolerance | Choose P6KE45A for cost-sensitive industrial designs where AEC-Q101 is not mandated. |
Compared with SMBJ45A and P6KE45A, the SA45 provides AEC-Q101 qualification, tighter VBR tolerance (50.0–61.1V), and optimized clamping for 45V nominal systems - making it the preferred choice for automotive-grade 12V/24V power rail protection where reliability and regulatory compliance are mandatory.
Availability
SA45 is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface protection, LED driver overvoltage clamp, and DC-DC converter input protection requiring stable component supply across production lifecycles.
Supply support for SA45 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 is designed specifically for high-reliability transient suppression in harsh environments, with AEC-Q101 variants targeting automotive power distribution, lighting, and body electronics applications.
FAQ
What is the breakdown voltage range of the SA45?
The SA45 has a minimum breakdown voltage (VBR) of 50.0 V and a maximum of 61.1 V, measured at 1 mA test current per ANSI/IEEE C62.35. This range ensures consistent clamping behavior across production lots while accommodating process variation - critical for predictable overvoltage protection in 45V-rated systems.
Is the SA45 unidirectional or bidirectional?
The SA45 is a unidirectional TVS diode, indicated by the absence of "CA" or "C" suffix and confirmed by its cathode band marking per DO-204AC mechanical drawing. It conducts only during reverse overvoltage events and blocks forward current - ideal for DC power rail protection where polarity is fixed.
Does the SA45 meet AEC-Q101 requirements?
Yes, the SA45 is AEC-Q101 qualified when ordered with the "H" suffix (e.g., SA45H). The base SA45 part is not automatically qualified; qualification applies only to versions explicitly marked and tested per AEC-Q101 stress test conditions, including temperature cycling, HTRB, and ESD.
What is the maximum clamping voltage of the SA45 under surge conditions?
The SA45 exhibits a maximum clamping voltage (VC) of 80.3 V at 6.5 A peak pulse current (IPPM), tested with the standard 10/1000μs waveform. This value defines the upper voltage limit imposed on protected circuitry during worst-case surge events, ensuring compatibility with 80V-rated downstream components.
What package type does the SA45 use, and how is polarity identified?
The SA45 uses the DO-204AC (DO-15) axial-leaded package. Polarity is identified by a cathode band printed on the epoxy body - the banded end connects to the protected line (cathode), while the unbanded end connects to ground (anode), per standard unidirectional TVS configuration.
SA45 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:
- 80.3V
- Current - Peak Pulse (10/1000µs):
- 6.5A
- 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)
SA45 FAQ
1.How can I place an order for SA45 through Aetrix?
Please submit a Request for Quotation (RFQ) for SA45 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 SA45 reliable?
The price and inventory of SA45 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA45 is usually 5 days.
3.What payment methods are accepted for SA45?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA45 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA45?
SA45 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA45 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 SA45?
For technical support, including SA45 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA45 requirements.
6.How does Aetrix verify that SA45 is sourced from the original manufacturer or authorized distributors?
All SA45 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 SA45 meets industry standards.
7.What is the process for return or replacement of SA45?
All SA45 units undergo pre-shipment inspection (PSI). If there is an issue with SA45, 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 SA45 part is unused and in its original packaging.
Return procedure for SA45:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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