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Taiwan Semiconductor Corporation SA75CA
- Part No.:
- SA75CA
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA75CA.pdf
- Description:
- TVS DIODE 75VWM 121VC DO204AC
- Quantity:
- Payment:
- Shipping:
Inventory:8,600
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Product details
Overview
SA75CA from Taiwan Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in DO-204AC (DO-15) package, rated for 500W peak pulse power at 10/1000μs, with 75V working stand-off voltage (VWM), 83.3–102V breakdown voltage (VBR), and 134V maximum clamping voltage (VC) at 3.9A peak pulse current - used to protect automotive lighting and industrial control circuits against ESD and electrical fast transients.
For engineers reviewing the SA75CA datasheet, SA75CA pinout, SA75CA application, or SA75CA equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification (indicated by 'H' suffix; SA75CA is not H-suffixed but CA denotes bidirectional), DO-15 mechanical compatibility, 175°C junction temperature rating, and low leakage (<1μA @ 75V).
Technical Context
The SA75CA operates as a bidirectional avalanche diode, symmetrically clamping voltage surges in both polarities without requiring external polarity management. Its VBR range (83.3–102V) and VC of 134V at IPPM = 3.9A define its surge-handling envelope under standardized 10/1000μs waveform conditions.
It features ultra-fast response time (<5.0ns for bidirectional mode), low dynamic impedance, and thermal stability up to TJ = 175°C. The device meets RoHS and halogen-free requirements per IEC 61249-2-21, with pure tin-plated leads compliant to J-STD-002 solderability standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 75 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 83.3 / 102 V @ IT = 1 mA - Ensures reliable avalanche conduction onset across manufacturing lot |
| VC @ IPPM | 134 V @ 3.9 A - Clamped voltage during 10/1000μs surge; defines protected circuit's max overvoltage stress |
| PPK | 500 W - Peak pulse power handling per single non-repetitive 10/1000μs event |
| IR @ VWM | <1 μA - Negligible leakage at rated stand-off, minimizing standby power loss |
| TJ max | 175 °C - Enables operation in under-hood automotive or high-ambient industrial environments |
| Package | DO-204AC (DO-15) - Industry-standard axial leaded package with 0.400g mass and UL 94V-0 molding |
Pinout & Package
DO-204AC (DO-15) package: axial-leaded, cylindrical glass-passivated body with cathode band marking for unidirectional variants; SA75CA is bidirectional and marked without polarity band - terminals are non-polarized and interchangeable.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional avalanche junction | No functional distinction between leads; either terminal serves as input/output for transient energy diversion |
| Lead 1 / Lead 2 | Surge current path | Both leads conduct equal surge current in either direction; no PCB layout polarity constraint |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity awareness |
| 500W 10/1000μs rating | Withstands high-energy transients common in automotive load-dump and inductive switching events |
| <5.0ns response time | Clamps before sensitive downstream ICs experience damaging overvoltage - critical for CAN/LIN bus protection |
| AEC-Q101 qualified option available | SA75CA itself is not AEC-Q101 qualified ('H' suffix required), but same-family SA75CAH exists for automotive-grade deployment |
| RoHS & halogen-free | Complies with environmental regulations for industrial and consumer electronics manufacturing |
Applications
| Automotive Lighting Systems | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting LED driver ICs and microcontrollers in headlamp modules subjected to load dump and ISO 7637-2 pulses. IC Role / Device Role: Primary overvoltage clamp on 12V/24V supply rail and CAN communication lines. Use Value: Limits transient voltage to ≤134V, preventing latch-up or gate oxide damage in 3.3V/5V logic interfaces. | Use Scenario: Safeguarding digital input channels of programmable logic controllers exposed to relay coil flyback and EFT bursts. IC Role / Device Role: Front-end transient absorber on 24V DC sensor inputs and fieldbus connections. Use Value: Maintains signal integrity by clamping spikes within 5ns while drawing <1μA at nominal 24V operation. |
| Smart Building HVAC Controls | Power Tool Motor Drive Circuits |
Use Scenario: Shielding RS-485 transceivers and MCU GPIOs in thermostats and zone controllers from ESD and lightning-induced surges. IC Role / Device Role: Bidirectional TVS on differential bus lines and power rails interfacing with external sensors. Use Value: Symmetric clamping ensures equal protection regardless of surge polarity - essential for two-wire bus reliability. | Use Scenario: Suppressing inductive kickback from brushed DC motor commutation in cordless power tools. IC Role / Device Role: Across-motor terminals and H-bridge power supply rails to absorb 500W flyback energy. Use Value: Withstands repeated 3.9A peak pulses without degradation, extending system lifetime in high-duty-cycle applications. |
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 SMAJ75CA | Same DO-214AC package (not DO-15); 75V VWM, 134V VC @ 3.9A, but 600W PPK rating | Higher surge margin; requires PCB footprint change due to SMD SMA package | Select when board space allows SMD and higher pulse power margin is needed |
| ON Semiconductor 1.5KE75CA | DO-201AD package; 75V VWM, 134V VC @ 3.9A, 1500W PPK, larger thermal mass | Higher power handling but 2× larger footprint and 1.1g weight vs. SA75CA's 0.4g | Select for legacy through-hole designs needing >500W derated surge capacity |
Compared with SMAJ75CA and 1.5KE75CA, the SA75CA offers identical electrical clamping performance in a smaller, lighter DO-15 package optimized for cost-sensitive, space-constrained industrial and automotive auxiliary modules - though it lacks AEC-Q101 certification unless ordered as SA75CAH.
Availability
SA75CA is available at Aetrix Electronics and suitable for automotive lighting systems, industrial PLC I/O protection, smart building HVAC controls, and power tool motor drive circuits requiring stable component supply and consistent DO-204AC (DO-15) form factor.
Supply support for SA75CA 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 Company (TSC) is a vertically integrated semiconductor manufacturer specializing in discrete power devices, TVS diodes, rectifiers, and MOSFETs for industrial, automotive, and consumer markets.
The SA Series TVS diodes are designed specifically for robust, cost-effective transient suppression in harsh environments - emphasizing high surge capability, low leakage, and mechanical reliability in axial-leaded packages.
FAQ
What is the polarity configuration of SA75CA?
The SA75CA is a bidirectional TVS diode with symmetrical avalanche characteristics in both directions. It has no designated anode or cathode - either lead may be connected to line or return. Unlike unidirectional SA75A, the 'CA' suffix explicitly denotes bidirectional functionality, eliminating need for polarity-aware PCB layout.
Does SA75CA meet AEC-Q101 qualification?
No, the standard SA75CA is not AEC-Q101 qualified. AEC-Q101 compliance is indicated by the 'H' suffix (e.g., SA75CAH). The SA75CA datasheet confirms AEC-Q101 qualification is "available" for the SA Series, but only for parts explicitly ordered with the 'H' suffix - SA75CA alone does not carry this qualification.
What is the maximum clamping voltage of SA75CA and under what test condition?
The SA75CA has a maximum clamping voltage (VC) of 134 V, measured at a peak pulse current (IPPM) of 3.9 A using the standardized 10/1000 μs double-exponential surge waveform. This value is guaranteed across the full operating temperature range and defines the upper voltage limit imposed on protected circuitry during transient events.
Can SA75CA replace SA75A in a design?
No - SA75CA and SA75A are functionally distinct. SA75A is unidirectional (anode/cathode asymmetric), while SA75CA is bidirectional (symmetric). Substituting SA75CA for SA75A removes polarity dependency but alters surge path behavior in DC-biased circuits; redesign verification is required, especially where forward conduction or DC blocking is part of the protection scheme.
What is the junction temperature rating and thermal derating behavior of SA75CA?
The SA75CA has a maximum junction temperature (TJ) of 175°C and is rated for steady-state power dissipation of 3 W at TL = 75°C with 9.5 mm lead lengths mounted on 10 × 10 mm copper pads. Its peak pulse power de-rates linearly above TA = 25°C per Figure 2 in the datasheet, reaching ~50% of 500W at 100°C ambient.
SA75CA 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):
- 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-204AC (DO-15)
SA75CA FAQ
1.How can I place an order for SA75CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SA75CA 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 SA75CA reliable?
The price and inventory of SA75CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA75CA is usually 5 days.
3.What payment methods are accepted for SA75CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA75CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA75CA?
SA75CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA75CA 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 SA75CA?
For technical support, including SA75CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA75CA requirements.
6.How does Aetrix verify that SA75CA is sourced from the original manufacturer or authorized distributors?
All SA75CA 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 SA75CA meets industry standards.
7.What is the process for return or replacement of SA75CA?
All SA75CA units undergo pre-shipment inspection (PSI). If there is an issue with SA75CA, 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 SA75CA part is unused and in its original packaging.
Return procedure for SA75CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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