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Taiwan Semiconductor Corporation SA45CH
- Part No.:
- SA45CH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA45CH.pdf
- Description:
- 500W, 55.6V, BIDIRECTIONAL, TVS
- Quantity:
- Payment:
- Shipping:
Inventory:5,633
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Product details
Overview
SA45CH from Taiwan Semiconductor is a unidirectional AEC-Q101-qualified transient voltage suppressor (TVS) diode in DO-204AC (DO-15) package, designed for automotive and industrial overvoltage protection. It features 45 V working stand-off voltage (VWM), 50.0–61.1 V breakdown voltage (VBR @ 1 mA), 80.3 V maximum clamping voltage at 6.5 A peak pulse current, and 500 W surge capability per 10/1000 µs waveform.
For engineers reviewing the SA45CH datasheet, SA45CH pinout, SA45CH application, or SA45CH equivalent, this device is selected for robust ESD and electrical fast transient (EFT) immunity in automotive power rails, LED driver inputs, and microcontroller I/O protection where low leakage (<1 µA @ 45 V), fast response (<1.0 ps), and high junction temperature tolerance (−55 °C to +175 °C) are critical.
Technical Context
The SA45CH operates as a unidirectional avalanche diode with cathode-band polarity marking, optimized for clamping transients on DC power lines and signal paths. Its breakdown is specified at 1 mA test current, with a maximum temperature coefficient of 58 mV/°C - enabling predictable VBR drift across automotive temperature ranges.
It delivers 500 W peak pulse power under standardized 10/1000 µs surge conditions, derated linearly above 25 °C ambient per Fig.2, and supports up to 70 A non-repetitive forward surge (8.3 ms half-sine) - confirming suitability for inductive load switching events in 12 V/24 V vehicle subsystems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 45 V - Maximum continuous reverse operating voltage before conduction begins; defines safe DC rail margin for 12 V/24 V automotive systems. |
| VBR min/max | 50.0 / 61.1 V @ 1 mA - Confirmed avalanche onset range; ensures reliable triggering above nominal system voltage with margin. |
| VC @ IPPM | 80.3 V @ 6.5 A - Clamped voltage during 10/1000 µs surge; limits downstream IC stress to <81 V under worst-case transient. |
| PPK | 500 W - Peak pulse power rating per JEDEC/IEC standards; validates survivability against ISO 7637-2 Pulse 1/2/5a/b threats. |
| IR @ VWM | <1 µA - Reverse leakage at 45 V; minimizes standby power loss and avoids false triggering in high-impedance sensor interfaces. |
| TJ max | +175 °C - Maximum junction temperature; enables placement near hot components (e.g., power MOSFETs, engine control units) without thermal derating. |
| Package | DO-204AC (DO-15) - Industry-standard axial-leaded package with tin-plated leads; compatible with wave soldering and manual rework. |
Pinout & Package
DO-204AC (DO-15) package with axial leads: Cathode indicated by band-marked end; Anode is unmarked lead. Leads are pure tin-plated, solderable per J-STD-002, and meet JESD201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Surge current sink node | Connected to protected line (e.g., battery rail); conducts transient energy to ground when V > VBR. |
| Anode (unmarked end) | Reference/ground return | Typically tied to chassis or system ground; completes clamping path during overvoltage event. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - required for under-hood and ADAS applications. |
| 500 W surge rating (10/1000 µs) | Meets ISO 7637-2 Pulse 5a (load dump) and IEC 61000-4-5 Level 3 immunity requirements without external series impedance. |
| Clamping voltage ≤80.3 V | Ensures protected ICs (e.g., CAN transceivers, MCU GPIOs) remain below absolute maximum ratings during 6.5 A surge events. |
| Response time <1.0 ps | Activates faster than nanosecond-scale ESD events (IEC 61000-4-2), preventing latch-up or gate oxide damage in sensitive CMOS inputs. |
| RoHS & halogen-free | Complies with EU RoHS Directive 2011/65/EU and IEC 61249-2-21 - supports green manufacturing and end-of-life recycling mandates. |
Applications
| Automotive Power Rail Protection | LED Lighting Driver Input |
|---|---|
Use Scenario: Protecting 12 V/24 V battery-connected ECUs from load dump and alternator transients per ISO 7637-2. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and input filter capacitor to clamp surges before LDO/regulator stage. Use Value: Limits peak voltage to ≤80.3 V during 500 W transients, preserving regulator input rating and avoiding brownout resets. | Use Scenario: Safeguarding constant-current LED drivers in automotive headlamps or interior lighting from ESD and switching spikes. IC Role / Device Role / Timing Role: TVS mounted at driver IC input pins to absorb IEC 61000-4-2 ±15 kV contact discharge energy. Use Value: Sub-1 ps response prevents gate oxide failure in driver MOSFETs; <1 µA leakage avoids dimming drift in precision current sources. |
| Microcontroller I/O Protection | Industrial Sensor Interface |
Use Scenario: Shielding MCU GPIOs and communication lines (LIN, CAN FD stubs) from EFT bursts in body control modules. IC Role / Device Role / Timing Role: Low-capacitance TVS placed directly at connector entry point to shunt fast transients before signal conditioning circuitry. Use Value: 80.3 V clamping ensures MCU I/O stays within −0.3 V to VDD+0.3 V absolute max, preventing latch-up or permanent damage. | Use Scenario: Protecting analog sensor front-ends (e.g., pressure, temperature) in harsh industrial environments subject to lightning-induced surges. IC Role / Device Role / Timing Role: TVS installed at sensor cable entry to suppress common-mode transients coupled onto shielded twisted-pair lines. Use Value: 175 °C max junction temperature allows direct PCB mounting near heat-generating PLC modules without thermal shutdown. |
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, DO-214AC (SMA) package; 45 V VWM, 73.0 V VC @ 6.9 A; 400 W PPK rating. | Lower surge rating and higher clamping voltage; surface-mount only - requires PCB layout change. | Select SMAJ45A only if SMT assembly is mandatory and 400 W rating suffices for system-level threat profile. |
| P6SMB45A | Unidirectional, DO-214AA (SMB) package; 45 V VWM, 73.0 V VC @ 6.9 A; 600 W PPK rating. | Higher surge rating but same clamping; SMB footprint differs from DO-15 - mechanical fit and thermal pad design differ. | Choose P6SMB45A when 600 W margin is required and axial-to-SMB adapter or board revision is acceptable. |
Compared with SA45CH, SMAJ45A offers SMT compatibility but sacrifices 100 W surge capacity and increases clamping by 7.7 V, while P6SMB45A provides higher surge headroom in a different package - neither is pin-compatible, requiring physical redesign for replacement.
Availability
SA45CH is available at Aetrix Electronics and suitable for automotive electronics, LED lighting systems, and industrial sensor interfaces requiring stable component supply with AEC-Q101 qualification and long-term lifecycle support.
Supply support for SA45CH 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 engineered specifically for high-reliability transient suppression in automotive power systems, emphasizing AEC-Q101 compliance, wide VWM range (5–170 V), and robust 500 W surge handling in axial DO-15 packaging.
FAQ
What is the polarity configuration of the SA45CH?
The SA45CH is a unidirectional TVS diode with cathode identified by a band-marked lead. It conducts only when the cathode is at a higher potential than the anode - making it suitable for DC rail clamping where polarity is fixed. This configuration ensures low leakage (<1 µA @ 45 V) and precise breakdown behavior, unlike bidirectional variants such as SA45CA.
Does the SA45CH meet AEC-Q101 requirements?
Yes, the SA45CH is explicitly AEC-Q101 qualified, as confirmed by its "H" suffix in the ordering code and documentation in TSC's SA Series datasheet Version L2105. It has undergone stress testing including high-temperature reverse bias, temperature cycling, and ESD per AEC-Q101 Rev D, validating its use in automotive powertrain and body electronics.
What is the maximum clamping voltage of the SA45CH under surge conditions?
The SA45CH has a maximum clamping voltage (VC) of 80.3 V at 6.5 A peak pulse current (IPPM), measured per 10/1000 µs waveform. This value is guaranteed across production lots and temperature range, ensuring protected circuits remain within safe voltage margins during ISO 7637-2 Pulse 5a load dump events.
Can the SA45CH be used in bidirectional applications?
No, the SA45CH is unidirectional only. For bidirectional protection, TSC offers the SA45CA variant (with "CA" suffix), which provides symmetrical clamping in both polarities. Using SA45CH in AC or reversible polarity circuits risks failure due to forward conduction during negative transients.
What is the thermal derating behavior of the SA45CH above 25°C ambient?
The SA45CH's peak pulse power (PPK) is derated linearly above 25°C ambient per Figure 2 in the datasheet: at 75°C TA, PPK drops to ~350 W; at 125°C TA, it falls to ~175 W. This derating must be applied when calculating surge margin in high-temperature environments like engine compartments.
SA45CH 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:
- 80.3V
- Current - Peak Pulse (10/1000µs):
- 6.5A
- 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)
SA45CH FAQ
1.How can I place an order for SA45CH through Aetrix?
Please submit a Request for Quotation (RFQ) for SA45CH 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 SA45CH reliable?
The price and inventory of SA45CH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA45CH is usually 5 days.
3.What payment methods are accepted for SA45CH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA45CH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA45CH?
SA45CH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA45CH 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 SA45CH?
For technical support, including SA45CH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA45CH requirements.
6.How does Aetrix verify that SA45CH is sourced from the original manufacturer or authorized distributors?
All SA45CH 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 SA45CH meets industry standards.
7.What is the process for return or replacement of SA45CH?
All SA45CH units undergo pre-shipment inspection (PSI). If there is an issue with SA45CH, 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 SA45CH part is unused and in its original packaging.
Return procedure for SA45CH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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