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Taiwan Semiconductor Corporation SA33CA
- Part No.:
- SA33CA
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA33CA.pdf
- Description:
- TVS DIODE 33VWM 71.4VC DO204AC
- Quantity:
- Payment:
- Shipping:
Inventory:8,976
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Product details
Overview
SA33CA 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 33V working stand-off voltage (VWM), 36.7–40.6V breakdown voltage (VBR), and 71.4V maximum clamping voltage (VC) at 9.8A peak pulse current - used to protect automotive lighting and industrial control interfaces against ESD and inductive switching transients.
For engineers reviewing the SA33CA datasheet, SA33CA pinout, SA33CA application, or SA33CA equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification (indicated by 'H' suffix; SA33CA lacks 'H', so non-automotive grade), DO-15 mechanical compatibility, low leakage (<1μA @ 33V), and fast response time (≤5.0ns for bidirectional operation).
Technical Context
The SA33CA is a silicon avalanche diode designed for unidirectional or bidirectional transient suppression. Its bidirectional configuration enables symmetrical clamping in AC-coupled or floating signal lines without polarity dependency. Electrical characteristics apply identically in both directions per manufacturer specification.
It operates across –55°C to +175°C junction temperature range and features low dynamic impedance during surge events, enabling effective voltage limiting under 10/1000μs waveform stress. The device uses standard DO-15 package geometry with pure tin-plated leads compliant with J-STD-002 solderability requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC/AC bias margin. |
| VBR min/max | 36.7 V / 40.6 V @ 1 mA - Breakdown threshold range; ensures reliable turn-on within defined tolerance at test current. |
| VC @ IPPM | 71.4 V @ 9.8 A - Clamped voltage during 10/1000μs surge; determines maximum stress imposed on protected circuitry. |
| PPK | 500 W - Peak pulse power handling per single non-repetitive event; validates robustness against IEC 61000-4-5 surges. |
| IR @ VWM | <1 μA - Reverse leakage at stand-off voltage; ensures minimal power loss and signal integrity in high-impedance circuits. |
| TJ max | +175 °C - Maximum junction temperature; supports operation in under-hood or industrial environments with elevated ambient. |
| Response time | ≤5.0 ns - Time from 0 V to VBR under bidirectional surge; critical for protecting high-speed digital interfaces from EFT. |
Pinout & Package
SA33CA is housed in a DO-204AC (DO-15) axial-leaded package with cathode band marking omitted due to bidirectional construction. Leads are pure tin-plated and solderable per J-STD-002. Polarity is not applicable; terminals are functionally symmetric.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bidirectional avalanche junction | Either terminal serves as anode or cathode depending on transient polarity; no fixed polarity required in layout. |
| Lead 1 | Terminal connection | Electrically identical to Lead 2; PCB footprint must accommodate axial DO-15 mechanical dimensions (L=7.6mm, D=3.6mm). |
| Lead 2 | Terminal connection | Matches Lead 1 in electrical behavior and thermal path; both leads contribute equally to thermal dissipation in PCB copper pads. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables protection of AC signals, differential buses, or floating nodes without polarity constraints or external circuitry. |
| 500W 10/1000μs surge rating | Meets IEC 61000-4-5 Level 3 (1kV line-to-ground) and Level 4 (2kV line-to-ground) surge immunity requirements. |
| ≤5.0 ns response time | Fast enough to limit sub-microsecond ESD events (IEC 61000-4-2) before sensitive IC inputs are overstressed. |
| RoHS & halogen-free | Complies with EU RoHS Directive 2011/65/EU and IEC 61249-2-21; suitable for environmentally regulated industrial and consumer products. |
| DO-204AC (DO-15) package | Standardized axial footprint compatible with legacy through-hole assembly processes and widely available PCB footprints. |
Applications
| Automotive Lighting Control | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting LED driver outputs and CAN/LIN bus stubs in headlamp modules from load dump and inductive kickback. IC Role / Device Role / Timing Role: Bidirectional TVS placed across output terminals to clamp transients before they reach gate drivers or communication transceivers. Use Value: Limits clamped voltage to 71.4 V, staying below 80 V absolute maximum ratings of common automotive gate drivers and transceivers. |
Use Scenario: Safeguarding 24 V DC digital input cards in programmable logic controllers exposed to relay coil flyback and field wiring surges. IC Role / Device Role / Timing Role: Standoff-rated TVS connected between input line and ground to shunt energy before it reaches optocoupler input stages. Use Value: With 33 V VWM and 71.4 V VC, it preserves 24 V system margin while suppressing >1 kV transients per IEC 61000-4-4. |
| USB-C Port ESD Protection | AC Motor Drive Feedback Sensing |
Use Scenario: Secondary-level ESD protection on USB-C CC and VCONN lines where primary protection resides upstream. IC Role / Device Role / Timing Role: Bidirectional TVS applied differentially across signal pairs to suppress ±15 kV contact discharge without distorting signaling. Use Value: ≤5.0 ns response ensures clamping activation prior to USB 2.0 data edge transitions, preventing bit errors. |
Use Scenario: Shielding analog feedback paths (e.g., current sense resistors) in variable-frequency drives from commutation noise coupling. IC Role / Device Role / Timing Role: Low-leakage (≤1 μA) TVS placed across op-amp inputs to prevent latch-up during 4 kV EFT bursts. Use Value: Sub-μA leakage avoids offset error in mV-range sensing circuits; 175 °C TJ max supports placement near heat-generating IGBT modules. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ33CA (Bourns) | Same DO-214AA (SMB) package; 33 V VWM, 52.8 V VC @ 9.6 A; 600 W rating; higher clamping ratio but surface-mount only. | Requires SMT rework and footprint change; better suited for space-constrained PCBs with automated assembly. | Select SMBJ33CA when board real estate is limited and SMT process is established; avoid if through-hole assembly or thermal mass from axial leads is preferred. |
| P6KE33CA (ON Semiconductor) | DO-204AC (DO-15) package; same 33 V VWM, but 53.3 V VC @ 9.8 A and 600 W rating; tighter VBR tolerance (36.7–40.6 V vs. 36.7–42.2 V). | Lower clamping voltage improves protection margin for 3.3 V/5 V logic interfaces downstream of protection stage. | Choose P6KE33CA when lower VC is critical and AEC-Q101 is not required; verify lead finish compatibility (P6KE33CA uses matte Sn, SA33CA uses pure Sn). |
Compared with SMBJ33CA and P6KE33CA, SA33CA offers identical DO-15 through-hole compatibility and AEC-Q101 availability in 'H' variants (e.g., SA33CAH), but has higher clamping voltage - making it appropriate for 24–48 V systems where margin above 70 V is acceptable, rather than low-voltage logic protection.
Availability
SA33CA is available at Aetrix Electronics and suitable for automotive lighting control, industrial PLC I/O protection, and USB-C port ESD protection requiring stable component supply, long-term obsolescence management, and traceable sourcing.
Supply support for SA33CA 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, with global distribution and AEC-Q101 qualified product lines.
The SA Series TVS diodes are engineered for high-energy transient suppression in automotive, industrial, and consumer systems - emphasizing reliability under repetitive surge stress and compatibility with standard through-hole assembly infrastructure.
FAQ
What does the 'CA' suffix indicate in SA33CA?
The 'CA' suffix in SA33CA denotes a bidirectional configuration, meaning the device provides symmetrical clamping in both polarities. Unlike unidirectional 'A' variants (e.g., SA33A), SA33CA has no cathode marking and functions identically regardless of voltage polarity - essential for protecting AC-coupled or floating signal lines without polarity constraints.
Is SA33CA AEC-Q101 qualified?
No, SA33CA is not AEC-Q101 qualified. Per TSC ordering information, AEC-Q101 qualification is indicated by an 'H' suffix (e.g., SA33CAH). SA33CA is intended for industrial and commercial applications; for automotive use, SA33CAH must be specified to ensure compliance with AEC-Q101 stress testing requirements including temperature cycling and HTRB.
What is the maximum clamping voltage of SA33CA and how is it measured?
The maximum clamping voltage of SA33CA is 71.4 V, measured at 9.8 A peak pulse current under the standardized 10/1000 μs double-exponential surge waveform. This value represents the highest voltage the device allows across its terminals during a worst-case transient, directly defining the overvoltage stress imposed on downstream circuitry.
Can SA33CA replace SA33A in a design?
SA33CA can replace SA33A only if bidirectional clamping is required and polarity-sensitive layout changes are acceptable. SA33A is unidirectional with a marked cathode; SA33CA has no polarity marking and clamps in both directions. Swapping requires verifying that reverse-bias operation of downstream components remains within safe limits - especially for circuits with DC bias or asymmetric signal paths.
What is the junction temperature rating of SA33CA and why does it matter?
SA33CA has a maximum junction temperature (TJ) rating of +175 °C. This high rating enables reliable operation in under-hood automotive environments, near power converters, or in sealed industrial enclosures where ambient temperatures exceed 100 °C - ensuring sustained surge-handling capability without thermal runaway or parameter drift.
SA33CA 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):
- 33V
- Voltage - Breakdown (Min):
- 36.7V
- Voltage - Clamping (Max) @ Ipp:
- 71.4V
- Current - Peak Pulse (10/1000µs):
- 9.8A
- 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)
SA33CA FAQ
1.How can I place an order for SA33CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SA33CA 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 SA33CA reliable?
The price and inventory of SA33CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA33CA is usually 5 days.
3.What payment methods are accepted for SA33CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA33CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA33CA?
SA33CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA33CA 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 SA33CA?
For technical support, including SA33CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA33CA requirements.
6.How does Aetrix verify that SA33CA is sourced from the original manufacturer or authorized distributors?
All SA33CA 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 SA33CA meets industry standards.
7.What is the process for return or replacement of SA33CA?
All SA33CA units undergo pre-shipment inspection (PSI). If there is an issue with SA33CA, 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 SA33CA part is unused and in its original packaging.
Return procedure for SA33CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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