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Taiwan Semiconductor Corporation SA75AH
- Part No.:
- SA75AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA75AH.pdf
- Description:
- TVS DIODE 75VWM 121VC DO204AC
- Quantity:
- Payment:
- Shipping:
Inventory:7,632
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Product details
Overview
SA75AH 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 75 V working stand-off voltage (VWM), 83.3–102 V breakdown voltage (VBR @ 1 mA), 134 V maximum clamping voltage (VC) at 3.9 A peak pulse current, and 500 W peak pulse power rating per 10/1000 µs waveform.
For engineers reviewing the SA75AH datasheet, SA75AH pinout, SA75AH application, or SA75AH equivalent, this device is selected for high-reliability DC bus protection in automotive lighting modules, ECU power rails, and inductive load switching circuits where fast clamping (<1 ps response), low leakage (<1 µA @ 75 V), and AEC-Q101 qualification are mandatory.
Technical Context
The SA75AH operates as a unidirectional avalanche diode with silicon planar junction construction, optimized for transient suppression on positive-rail DC lines. Its clamping behavior follows IEEE C62.35 standards, with guaranteed VBR tolerance (±10% typical), temperature coefficient of 101 mV/°C, and junction operating range from –55 °C to +175 °C.
It delivers 500 W surge capability under non-repetitive 10/1000 µs waveform, derated linearly above 25 °C ambient per Fig.2, and supports 70 A IFSM (8.3 ms half-sine) for inrush robustness. Polarity is marked by cathode band; terminals are pure tin-plated per J-STD-002.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 75 V - Maximum continuous DC or RMS voltage the device blocks without conduction |
| VBR min/max | 83.3 V / 102 V @ 1 mA - Confirmed avalanche onset range defining turn-on threshold under surge |
| VC @ IPPM | 134 V @ 3.9 A - Clamped voltage during 10/1000 µs transient, limiting downstream stress |
| PPK | 500 W - Peak pulse power handling per standard waveform, enabling IEC 61000-4-5 Level 4 compliance |
| IR @ VWM | <1 µA - Negligible leakage at rated stand-off, preserving system efficiency and battery drain |
| TJ max | +175 °C - Extended junction temperature rating supporting under-hood automotive placement |
| Package | DO-204AC (DO-15) - Industry-standard axial leaded package with UL 94V-0 molding and JESD201 Class 2 whisker resistance |
Pinout & Package
DO-204AC (DO-15) axial-leaded package with cathode band marking polarity. Leads are pure tin-plated, solderable per J-STD-002, and meet JESD201 Class 2 whisker test requirements. Weight ≈ 0.400 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Ground-reference terminal | Connected to system ground or low-side return path; defines unidirectional conduction direction |
| Cathode | Protected-line terminal | Connected to line being protected (e.g., 12 V rail); conducts surge current to ground when V > VBR |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per AEC specification |
| Fast response time | <1.0 ps from 0 V to VBR - Enables suppression before sensitive ICs experience overvoltage damage |
| Low clamping impedance | VC − VBR = ~50 V differential - Minimizes let-through energy during transients |
| Halogen-free & RoHS | Complies with IEC 61249-2-21 and EU RoHS Directive - Supports green manufacturing and end-of-life compliance |
Applications
| Automotive Lighting Module Protection | Engine Control Unit (ECU) Power Rail |
|---|---|
Use Scenario: Protecting LED driver ICs and microcontrollers in headlamp assemblies from load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery feed and regulator input to clamp transients before LDO or buck converter. Use Value: Withstands 500 W surges and clamps to 134 V, preventing latch-up or gate oxide rupture in 5 V logic supplies downstream. | Use Scenario: Safeguarding 5 V/3.3 V power domains in engine control units exposed to alternator ripple and ignition noise. IC Role / Device Role / Timing Role: Primary front-end transient suppressor on main 12 V input rail, upstream of DC-DC converters and CAN transceivers. Use Value: AEC-Q101 qualification and 175 °C TJ max ensure operation in high-temperature under-hood environments without derating loss. |
| Industrial Solenoid Driver Protection | DC Motor Controller Gate Drive Supply |
Use Scenario: Shielding microcontroller GPIOs and driver ICs from inductive kickback when de-energizing 24 V solenoids in factory automation valves. IC Role / Device Role / Timing Role: Mounted across solenoid coil terminals or at driver output to absorb stored inductive energy. Use Value: 70 A IFSM rating handles repetitive switching surges; low IR ensures no measurable voltage drop during steady-state operation. | Use Scenario: Protecting isolated gate driver bias supplies (e.g., 15 V) in BLDC motor inverters from cross-conduction transients and Miller spikes. IC Role / Device Role / Timing Role: Placed on auxiliary supply rail feeding high-side gate drivers to limit voltage overshoot during fast switching transitions. Use Value: 134 V clamping voltage prevents overvoltage stress on gate oxide of SiC or GaN FET drivers operating near their VGS max. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ75A | Same DO-214AC package; bidirectional; VBR 83.3–92.1 V; VC = 121 V @ 4.3 A | Supports AC-coupled or bipolar transients; lacks AEC-Q101 qualification | Choose SMAJ75A only if bidirectional clamping is required and automotive qualification is not mandated. |
| P6SMB75A | DO-214AA package; unidirectional; VBR 83.3–92.1 V; VC = 121 V @ 4.3 A; AEC-Q101 available in 'H' variant | Same electrical specs but different mechanical footprint; requires PCB layout change | Select P6SMB75AH if DO-214AA board space is preferred and AEC-Q101 is needed-verify thermal pad compatibility. |
Compared with SMAJ75A and P6SMB75A, SA75AH uniquely combines DO-204AC form factor, unidirectional operation, and factory-certified AEC-Q101 qualification-making it the only drop-in solution for legacy DO-15 automotive designs requiring zero layout revision and full automotive traceability.
Availability
SA75AH is available at Aetrix Electronics and suitable for automotive lighting systems, engine control units, industrial solenoid drivers, and DC motor controllers requiring stable component supply with full AEC-Q101 documentation and lot-level traceability.
Supply support for SA75AH 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 power devices, TVS diodes, rectifiers, and MOSFETs for industrial and automotive markets.
The SA Series was developed specifically for high-energy transient suppression in harsh-environment applications, emphasizing AEC-Q101 compliance, tight VBR tolerance, and robust surge handling in standard axial packages like DO-15.
FAQ
What is the clamping voltage of SA75AH under a 10/1000 µs surge?
The SA75AH has a maximum clamping voltage (VC) of 134 V at 3.9 A peak pulse current under the standardized 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and guarantees the voltage seen by downstream circuitry will not exceed 134 V during such transients, protecting components rated for ≤135 V absolute maximum.
Is SA75AH suitable for bidirectional signal line protection?
No, SA75AH is a unidirectional TVS diode intended for DC power rail protection only. Its cathode-band marking and asymmetric IV curve mean it conducts only when the cathode is more positive than the anode. For bidirectional protection (e.g., data lines or AC inputs), use SA75A or SMAJ75A instead-SA75AH must not be used in reverse-biased configurations.
Does SA75AH require a heatsink in typical automotive applications?
No, SA75AH does not require a heatsink for transient suppression duty cycles. Its 3 W steady-state power dissipation rating (at TL = 75 °C with 9.5 mm lead length) is sufficient for leakage-current-only operation. During surge events, energy is absorbed capacitively and dissipated non-repetitively; thermal design focuses on PCB copper area per datasheet Fig.2 derating curves-not heatsinks.
What is the meaning of the 'H' suffix in SA75AH?
The 'H' suffix in SA75AH denotes full AEC-Q101 qualification per Rev D, including stress testing for temperature cycling, high-temperature reverse bias (HTRB), and electrostatic discharge (HBM/MM). This certification is documented in TSC's official AEC-Q101 certificate and applies specifically to the SA75AH part number-not to base SA75 or SA75A variants.
Can SA75AH replace SA75A in an existing design?
Yes, SA75AH is a direct replacement for SA75A in terms of electrical specs and DO-204AC packaging, with identical VWM (75 V), VBR (83.3–102 V), and VC (134 V). The sole functional difference is AEC-Q101 qualification-SA75AH adds automotive reliability validation without altering circuit performance, making it a drop-in upgrade for new production runs targeting automotive compliance.
SA75AH 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):
- 75V
- Voltage - Breakdown (Min):
- 83.3V
- Voltage - Clamping (Max) @ Ipp:
- 121V
- Current - Peak Pulse (10/1000µs):
- 4.3A
- 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)
SA75AH FAQ
1.How can I place an order for SA75AH through Aetrix?
Please submit a Request for Quotation (RFQ) for SA75AH 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 SA75AH reliable?
The price and inventory of SA75AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA75AH is usually 5 days.
3.What payment methods are accepted for SA75AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA75AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA75AH?
SA75AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA75AH 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 SA75AH?
For technical support, including SA75AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA75AH requirements.
6.How does Aetrix verify that SA75AH is sourced from the original manufacturer or authorized distributors?
All SA75AH 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 SA75AH meets industry standards.
7.What is the process for return or replacement of SA75AH?
All SA75AH units undergo pre-shipment inspection (PSI). If there is an issue with SA75AH, 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 SA75AH part is unused and in its original packaging.
Return procedure for SA75AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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