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Taiwan Semiconductor Corporation SA45CAH
- Part No.:
- SA45CAH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA45CAH.pdf
- Description:
- TVS DIODE 45VWM 72.7VC DO204AC
- Quantity:
- Payment:
- Shipping:
Inventory:9,023
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Product details
Overview
SA45CAH from Taiwan Semiconductor is a bidirectional AEC-Q101-qualified transient voltage suppressor (TVS) diode in DO-204AC (DO-15) package, designed for automotive and industrial surge 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 (VC) at 6.5 A peak pulse current, and 500 W peak pulse power rating at 10/1000 µs waveform.
For engineers reviewing the SA45CAH datasheet, SA45CAH pinout, SA45CAH application, or SA45CAH equivalent, this device is selected for high-reliability ESD and electrical fast transient (EFT) protection in automotive body electronics, lighting control modules, and 12 V/24 V power rail interfaces where bidirectional clamping and AEC-Q101 qualification are mandatory.
Technical Context
The SA45CAH operates as a bidirectional avalanche diode with symmetrical clamping behavior in both polarities, enabling protection against reverse- and forward-polarity transients without polarity sensitivity. Its 500 W surge capability is defined per IEC 61000-4-5 (10/1000 µs) and meets ISO 7637-2 pulse 1, 2a, 3a/b immunity requirements when properly mounted.
With a maximum junction temperature of 175 °C and operating range from –55 °C to +175 °C, it supports under-hood automotive environments. The device exhibits low leakage (<1 µA at 45 V) and fast response time (<5 ns), ensuring minimal interference with protected signal or power lines during normal operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 45 V - Maximum continuous DC or RMS voltage the device blocks without clamping; sets minimum system operating margin before protection activates. |
| VBR min/max | 50.0 / 61.1 V @ 1 mA - Verified avalanche onset range; ensures predictable turn-on within ±11% tolerance for robust design margining. |
| VC @ IPPM | 80.3 V @ 6.5 A - Clamped voltage during 10/1000 µs surge; defines worst-case overvoltage seen by downstream ICs during 500 W transient event. |
| PPK | 500 W - Peak pulse power handling per IEC 61000-4-5; enables protection against severe load dump and inductive switching surges. |
| TJ max | +175 °C - Maximum junction temperature; supports placement near heat sources in engine control units and power distribution modules. |
| IR @ VWM | <1 µA - Reverse leakage at rated stand-off voltage; ensures negligible standby current draw in always-on automotive circuits. |
| Package | DO-204AC (DO-15) - Industry-standard axial leaded package with 0.400 g mass; compatible with legacy through-hole assembly and reflow-solderable tin-plated leads. |
Pinout & Package
SA45CAH is a two-terminal bidirectional TVS diode in DO-204AC (DO-15) package. Polarity is not applicable: both terminals are electrically symmetric and interchangeable. Cathode band marking is omitted per bidirectional configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Surge current path terminal | Provides identical clamping behavior in either direction; no orientation required during PCB placement or assembly. |
| Leads (Tin-plated) | PCB interface and thermal conduction path | Meets J-STD-002 solderability; 9.5 mm lead length supports 3 W steady-state dissipation on 10×10 mm copper pads. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per stress test plan - required for powertrain and chassis ECUs. |
| Bidirectional clamping | Identical VBR (50.0–61.1 V) and VC (80.3 V) in both directions - eliminates need for polarity-aware layout in differential or AC-coupled lines. |
| Low clamping ratio (VC/VBR) | 1.59 typical (80.3 V / 50.5 V avg) - minimizes overvoltage stress on protected 48 V tolerant transceivers and microcontrollers. |
| Halogen-free & RoHS compliant | Meets IEC 61249-2-21 and EU RoHS Directive 2011/65/EU - satisfies Tier 1 automotive material declaration and end-of-life compliance requirements. |
| Fast transient response | <5 ns response time - ensures clamping activation before nanosecond-scale ESD events damage sensitive CAN FD or LIN transceivers. |
Applications
| Automotive Body Control Module (BCM) | LED Headlamp Driver Protection |
|---|---|
Use Scenario: Protects LIN bus transceivers and microcontroller I/O pins from load dump and ESD during door module actuation and sensor polling. IC Role / Device Role: Bidirectional voltage clamp placed across LIN data line and ground, absorbing transients up to 500 W without latch-up. Use Value: Enables compliance with ISO 10605 (330 pF/330 Ω) and ISO 7637-2 pulse 1 (inductive switch-off) without additional series impedance. |
Use Scenario: Shields constant-current LED driver ICs from inductive kickback generated by PWM-controlled buck/boost stages in adaptive driving beam systems. IC Role / Device Role: Parallel-connected TVS across output stage MOSFET drain-source to clamp flyback voltage spikes during rapid current interruption. Use Value: Limits peak voltage to ≤80.3 V, preventing avalanche failure of 100 V-rated power FETs and maintaining >98% driver efficiency during transient events. |
| 12 V Power Rail Surge Suppression | Industrial CAN Bus Node Protection |
Use Scenario: Installed on main 12 V supply input of telematics control units to withstand battery reversal, jump-start surges, and alternator load dump per ISO 7637-2 pulse 5a. IC Role / Device Role: Primary front-end clamping device upstream of DC-DC converters and LDOs, shunting surge energy directly to chassis ground. Use Value: Withstands 500 W pulses while maintaining VWM = 45 V - provides ≥15 V headroom above nominal 12 V rail and accommodates 24 V dual-battery systems. |
Use Scenario: Placed across CAN_H and CAN_L differential pair in gateways and junction boxes to suppress EFT bursts and ESD coupling in factory automation networks. IC Role / Device Role: Symmetrical bidirectional clamp that maintains common-mode noise rejection while limiting differential overvoltage to safe levels for ISO 11898-2 transceivers. Use Value: Clamps to 80.3 V without polarity biasing - preserves CAN bus fault tolerance and prevents false dominant state triggering during 4 kV EFT bursts. |
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 SMAJ45CA | Same DO-214AC package, identical VWM (45 V), but lower PPK (400 W); VC = 72.7 V @ 5.5 A. | Marginally lower surge capacity; suitable for non-AEC-Q101 cost-sensitive industrial nodes. | Select SMAJ45CA only if 400 W rating suffices and AEC-Q101 is not required. |
| ON Semiconductor 1.5KE45CA | DO-201AD package (larger, higher thermal mass); same VWM (45 V), PPK = 1500 W; VC = 73.0 V @ 20.5 A. | Higher power handling but incompatible footprint; requires PCB redesign and larger board area. | Choose 1.5KE45CA only when 1500 W surge immunity is mandatory and space allows DO-201AD mounting. |
Compared with SMAJ45CA and 1.5KE45CA, SA45CAH uniquely delivers AEC-Q101 qualification in the compact DO-204AC package with 500 W rating - making it the optimal choice for space-constrained automotive modules requiring certified reliability without footprint compromise.
Availability
SA45CAH is available at Aetrix Electronics and suitable for automotive body electronics, LED lighting drivers, and industrial CAN bus nodes requiring stable component supply with full AEC-Q101 traceability and long-term lifecycle support.
Supply support for SA45CAH 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, and rectifiers with global automotive and industrial certifications.
The SA Series was developed specifically for AEC-Q101-compliant transient suppression in harsh automotive environments - targeting 12 V/24 V/48 V power rails, communication buses, and lighting subsystems where reliability and standardized packaging are critical.
FAQ
What does the "H" suffix in SA45CAH signify?
The "H" suffix in SA45CAH explicitly denotes AEC-Q101 qualification per the manufacturer's ordering code specification. This means SA45CAH has undergone full stress testing-including temperature cycling, high-temperature reverse bias, and ESD-per the AEC-Q101 standard for discrete semiconductors. SA45CAH is certified for use in automotive powertrain, chassis, and body electronics where reliability under extended temperature and vibration conditions is mandatory.
Is SA45CAH unidirectional or bidirectional, and how is polarity marked?
SA45CAH is a bidirectional TVS diode, as indicated by the "CA" suffix (C = bidirectional, A = AEC-Q101). It has no cathode band or polarity marking because both terminals exhibit identical clamping characteristics in either direction. This symmetry eliminates orientation concerns during placement and simplifies layout for differential or AC-coupled protection applications such as CAN bus or LIN data lines.
What is the maximum clamping voltage of SA45CAH under a 10/1000 µs surge?
The maximum clamping voltage (VC) of SA45CAH is 80.3 V at 6.5 A peak pulse current (IPPM), measured under the standard 10/1000 µs double-exponential surge waveform. This value is guaranteed across the full operating temperature range and represents the highest voltage that will appear across protected circuitry during a 500 W transient event - a key parameter for verifying compatibility with downstream IC absolute maximum ratings.
Can SA45CAH be used in 24 V automotive systems?
Yes, SA45CAH is suitable for 24 V automotive systems. Its 45 V working stand-off voltage (VWM) provides ≥21 V of margin above the 24 V nominal rail, accommodating typical transients like load dump (up to 35 V) and alternator overshoot. Combined with its AEC-Q101 qualification and –55 °C to +175 °C operating range, SA45CAH meets functional safety requirements for 24 V commercial vehicle ECUs and battery management interfaces.
What is the junction capacitance of SA45CAH, and does it affect high-speed data lines?
SA45CAH does not specify junction capacitance (CJ) in the provided documentation. However, as a DO-204AC-packaged TVS diode optimized for power rail and medium-speed bus protection (not RF or USB), its CJ is typically >100 pF - unsuitable for high-speed differential interfaces like USB 2.0 or HDMI. For SA45CAH, the design intent is protection of 12 V/24 V power nets and low-to-medium speed buses (LIN, CAN, RS-485), where capacitance impact is negligible and clamping performance dominates.
SA45CAH 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:
- -
- 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)
SA45CAH FAQ
1.How can I place an order for SA45CAH through Aetrix?
Please submit a Request for Quotation (RFQ) for SA45CAH 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 SA45CAH reliable?
The price and inventory of SA45CAH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA45CAH is usually 5 days.
3.What payment methods are accepted for SA45CAH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA45CAH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA45CAH?
SA45CAH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA45CAH 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 SA45CAH?
For technical support, including SA45CAH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA45CAH requirements.
6.How does Aetrix verify that SA45CAH is sourced from the original manufacturer or authorized distributors?
All SA45CAH 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 SA45CAH meets industry standards.
7.What is the process for return or replacement of SA45CAH?
All SA45CAH units undergo pre-shipment inspection (PSI). If there is an issue with SA45CAH, 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 SA45CAH part is unused and in its original packaging.
Return procedure for SA45CAH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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