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Taiwan Semiconductor Corporation SA45H
- Part No.:
- SA45H
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA45H.pdf
- Description:
- 500W, 55.6V, UNIDIRECTIONAL, TVS
- Quantity:
- Payment:
- Shipping:
Inventory:2,907
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Product details
Overview
SA45H 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 SA45H datasheet, SA45H pinout, SA45H application, or SA45H equivalent, this device is selected for robust ESD and electrical fast transient (EFT) immunity in automotive powertrain sensors, LED driver input stages, and 12 V/24 V DC supply rail protection where AEC-Q101 qualification and low leakage (<1 μA @ 45 V) are mandatory.
Technical Context
The SA45H operates as a unidirectional avalanche diode with sharp reverse-breakdown behavior, triggered when transient voltage exceeds its 50.0–61.1 V VBR range at 1 mA test current. Its clamping action limits downstream voltage to ≤80.3 V under 6.5 A 10/1000 μs surge, enabling protection of 48 V-rated ICs and microcontrollers.
It exhibits <1 μA reverse leakage at 45 V (VWM), a 58 mV/°C temperature coefficient of VBR, and junction operating temperature range from –55 °C to +175 °C - confirming suitability for under-hood automotive environments and high-reliability industrial controls.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 45 V - Maximum continuous DC or RMS voltage the device blocks without conduction |
| VBR min/max | 50.0 / 61.1 V @ 1 mA - Ensures reliable triggering above system nominal voltage while avoiding false trips |
| VC @ IPPM | 80.3 V @ 6.5 A - Clamped voltage seen by protected circuit during worst-case 10/1000 μs surge |
| PPK | 500 W - Peak surge power handling per single non-repetitive 10/1000 μs transient |
| IR @ VWM | <1 μA - Negligible leakage current preserves battery life and signal integrity in always-on systems |
| TJ max | +175 °C - Enables operation in engine compartment and high-ambient industrial enclosures |
| Package | DO-204AC (DO-15) - Industry-standard axial leaded package compatible with through-hole assembly and automated tape-and-reel feeding (3500/reel) |
Pinout & Package
DO-204AC (DO-15) package with axial leads: cathode indicated by band marking; anode and cathode terminals defined per polarity marking. 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 | Current entry point in forward bias; connected to system ground or low-side reference | Completes conduction path during transient clamp; must be routed with low-inductance connection to ground plane |
| Cathode | Current exit point in forward bias; connected to protected line (e.g., 12 V rail, sensor input) | Acts as high-impedance node until VBR exceeded; polarity marking ensures correct orientation in PCB layout |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive applications including powertrain, body electronics, and ADAS modules requiring stress-tested reliability |
| Low clamping ratio (VC/VBR ≈ 1.32) | Minimizes overvoltage stress on downstream silicon - critical for protecting 5 V or 3.3 V logic interfacing with 45 V rails |
| Fast response time <1 ps | Clamps transients before they propagate into sensitive analog or digital circuitry - essential for CAN/LIN bus and sensor front-ends |
| RoHS & halogen-free compliance | Meets IEC 61249-2-21 and global environmental regulations for automotive OEM and Tier-1 supply chains |
| UL 94V-0 molding compound | Prevents flame propagation during fault conditions - required for under-hood and safety-critical enclosure designs |
Applications
| Automotive Power Supply Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V/24 V vehicle battery-fed ECUs from load dump and ISO 7637-2 pulses. IC Role / Device Role: Primary TVS clamp on main power input, placed upstream of DC-DC converters and LDOs. Use Value: Withstands 500 W surges and clamps to 80.3 V, preventing damage to 100 V-rated input stages while meeting AEC-Q101 requirements. | Use Scenario: Shielding analog sensor outputs (e.g., pressure, temperature) from ESD events in factory automation equipment. IC Role / Device Role: Localized TVS on sensor signal lines adjacent to connector entry points. Use Value: Sub-1 ps response and <1 μA leakage preserve signal fidelity and minimize offset drift in precision measurement circuits. |
| LED Lighting Driver Input Stage | DC Motor Control Board Transient Suppression |
Use Scenario: Safeguarding constant-current LED drivers against switching transients and lightning-induced surges in outdoor lighting. IC Role / Device Role: Unidirectional TVS across input capacitor on primary side of buck/boost controller. Use Value: 45 V VWM aligns with 48 V nominal LED string supplies; 80.3 V VC ensures MOSFET gate drivers remain within safe SOA. | Use Scenario: Suppressing inductive kickback from brushed DC motors in HVAC actuators and robotic joints. IC Role / Device Role: Flyback TVS across motor terminals or H-bridge power FETs. Use Value: 6.5 A IPPM and 500 W rating handle repetitive commutation spikes without degradation; DO-15 package enables mechanical mounting near motor connectors. |
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 | DO-214AC (SMA) package; 45 V VWM; 500 W PPK; bidirectional configuration | Surface-mount only; lacks AEC-Q101 qualification; higher thermal resistance than DO-15 | Select SMAJ45A only for space-constrained SMT layouts where AEC-Q101 is not mandated |
| P6KE45A | DO-15 package; 45 V VWM; 600 W PPK; unidirectional; no AEC-Q101 documentation | Higher surge rating but unspecified automotive qualification; wider VBR tolerance (47.8–52.2 V) | Choose P6KE45A for cost-sensitive industrial use where AEC-Q101 is unnecessary and 600 W margin is prioritized |
Compared with SMAJ45A and P6KE45A, the SA45H uniquely combines DO-15 through-hole compatibility, AEC-Q101 validation, and tight VBR (50.0–61.1 V), making it the preferred choice for automotive production programs requiring traceable qualification and legacy assembly support.
Availability
SA45H is available at Aetrix Electronics and suitable for automotive powertrain modules, industrial sensor interfaces, LED driver input stages, and DC motor control boards requiring stable component supply with full AEC-Q101 compliance and long-term lifecycle assurance.
Supply support for SA45H 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 was developed specifically for high-reliability transient suppression in harsh environments, with emphasis on AEC-Q101 qualification, low clamping voltage, and robust surge endurance - targeting automotive body control, lighting, and power distribution systems.
FAQ
What is the AEC-Q101 qualification status of the SA45H?
The SA45H is explicitly qualified to AEC-Q101 Rev D for stress testing including HTGB, AC-H3TRB, TC, and UHAST. This certification confirms its suitability for automotive applications such as engine control units, body electronics, and ADAS subsystems where reliability under thermal and mechanical stress is mandatory. The SA45H datasheet revision L2105 documents full AEC-Q101 compliance, distinguishing it from standard industrial-grade TVS diodes.
Does the SA45H have bidirectional or unidirectional polarity?
The SA45H is a unidirectional TVS diode, as confirmed by its "H" suffix (per SA SERIES Ordering Information) and cathode band marking per DO-204AC mechanical drawing. It conducts only during reverse-biased overvoltage events - ideal for DC power rail protection where polarity is fixed. Bidirectional variants in the SA family use "CA" or "C" suffixes (e.g., SA45CA), which the SA45H does not carry.
What is the maximum clamping voltage of the SA45H and at what current is it specified?
The SA45H has a maximum clamping voltage (VC) of 80.3 V, measured at 6.5 A peak pulse current (IPPM) under the standard 10/1000 μs double-exponential waveform. This value is guaranteed across temperature and represents the upper limit of voltage imposed on protected circuitry during worst-case surge events, directly supporting design margin calculations for downstream ICs rated up to 100 V.
Can the SA45H be used in surface-mount designs?
No - the SA45H is packaged exclusively in DO-204AC (DO-15), a through-hole axial-leaded format. It is not available in surface-mount packages like SMA or SMC. For SMT implementations, engineers should consider alternatives such as the SMAJ45A (DO-214AC), though that part lacks AEC-Q101 qualification and is bidirectional. The SA45H's DO-15 footprint requires plated-through-hole PCB layout and wave or selective soldering processes.
How does the SA45H compare to the SA45A variant?
The SA45H and SA45A share identical electrical parameters (VWM = 45 V, VBR = 50.0–61.1 V, VC = 80.3 V), but differ in qualification and marking: SA45H is AEC-Q101 qualified and marked with "H", while SA45A is industrial-grade without automotive qualification. Both use DO-204AC packaging and tape-and-reel delivery, but only SA45H meets OEM automotive procurement requirements for stress-tested reliability and traceable qualification records.
SA45H 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:
- -
- 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)
SA45H FAQ
1.How can I place an order for SA45H through Aetrix?
Please submit a Request for Quotation (RFQ) for SA45H 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 SA45H reliable?
The price and inventory of SA45H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA45H is usually 5 days.
3.What payment methods are accepted for SA45H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA45H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA45H?
SA45H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA45H 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 SA45H?
For technical support, including SA45H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA45H requirements.
6.How does Aetrix verify that SA45H is sourced from the original manufacturer or authorized distributors?
All SA45H 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 SA45H meets industry standards.
7.What is the process for return or replacement of SA45H?
All SA45H units undergo pre-shipment inspection (PSI). If there is an issue with SA45H, 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 SA45H part is unused and in its original packaging.
Return procedure for SA45H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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