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Taiwan Semiconductor Corporation SA33CAH
- Part No.:
- SA33CAH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA33CAH.pdf
- Description:
- TVS DIODE 33VWM 71.4VC DO204AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,156
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Product details
Overview
SA33CAH from Taiwan Semiconductor is a bidirectional AEC-Q101-qualified 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), 36.7–44.9V breakdown voltage (VBR), and 58.1V maximum clamping voltage (VC) at 8.8A peak pulse current - designed for automotive ESD and load-dump protection in power electronics.
For engineers reviewing the SA33CAH datasheet, SA33CAH pinout, SA33CAH application, or SA33CAH equivalent, key selection criteria include bidirectional surge capability, AEC-Q101 qualification, DO-15 mechanical compatibility, low leakage (<1μA @ 33V), and clamping performance under ISO 7637-2 Pulse 1/2/5a waveforms.
Technical Context
The SA33CAH is a silicon avalanche diode engineered for bidirectional transient suppression, operating symmetrically in both polarities with identical VBR (36.7–44.9V), VC (58.1V @ 8.8A), and temperature coefficient (42 mV/°C). It meets AEC-Q101 stress test requirements including high-temperature reverse bias, temperature cycling, and mechanical shock.
Its DO-204AC (DO-15) package supports lead-free reflow soldering per J-STD-002, features pure tin-plated leads, UL 94V-0 molding compound, and is rated for junction temperatures from –55°C to +175°C - enabling use in under-hood automotive environments where thermal robustness and reliability are critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33 V - Maximum continuous DC or RMS voltage the device blocks without clamping; defines system operating voltage margin before conduction. |
| VBR min/max | 36.7 V / 44.9 V - Breakdown occurs within this range at 1 mA test current; ensures predictable turn-on across production lot and temperature. |
| VC @ IPPM | 58.1 V @ 8.8 A - Clamping voltage during 10/1000μs surge; limits downstream IC voltage stress to safe levels during transients. |
| PPK | 500 W - Peak pulse power handling per single non-repetitive 10/1000μs waveform; validates compliance with ISO 7637-2 Pulse 5a. |
| IR @ VWM | <1 μA - Reverse leakage at 33 V; minimizes standby power loss and avoids false triggering in high-impedance sensing circuits. |
| TJ max | +175 °C - Maximum junction temperature; enables placement near heat sources (e.g., power MOSFETs, engine control units) without derating. |
Pinout & Package
SA33CAH uses a 2-terminal DO-204AC (DO-15) axial package with no polarity marking - consistent with bidirectional operation. Terminals are unmarked and function identically in either orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional avalanche junction | Either terminal serves as anode or cathode depending on transient polarity; no mounting orientation dependency. |
| Lead 1 / Lead 2 | Surge current path | Provides low-inductance, low-impedance path to shunt >8.8A transient current away from protected circuitry. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive under-hood applications including temperature cycling, HTRB, and mechanical shock per Rev G requirements. |
| 500W 10/1000μs rating | Meets ISO 7637-2 Pulse 5a (load dump) energy requirement for 12V systems without external series impedance. |
| Bidirectional symmetry | Identical VBR, VC, and IPPM in both directions - eliminates need for polarity-aware layout or orientation verification. |
| Low clamping ratio (VC/VBR ≈ 1.4) | Ensures minimal overvoltage overshoot during fast transients, protecting 3.3V/5V logic interfaces downstream of LDOs or DC-DC converters. |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital I/O Protection |
|---|---|
Use Scenario: Protecting LIN bus transceivers and microcontroller GPIOs from battery line transients during ignition and load dump events. IC Role / Device Role: Bidirectional TVS placed between VBAT and GND adjacent to power entry point. Use Value: Limits voltage to ≤58.1V during 100V/100ms load dump, preventing latch-up or permanent damage to 33V-rated CAN/LIN interface ICs. | Use Scenario: Safeguarding 24V digital input channels against field-wiring induced surges and inductive kickback from solenoid valves. IC Role / Device Role: Primary surge clamp across input terminals upstream of optocoupler or Schmitt trigger input stage. Use Value: Withstands ≥8.8A peak current while clamping to 58.1V, preserving signal integrity and avoiding false triggering in noise-prone factory environments. |
| LED Headlamp Driver Protection | Automotive Infotainment Power Rail |
Use Scenario: Shielding buck converter inputs and LED driver ICs from alternator ripple and switching noise in 12V headlamp modules. IC Role / Device Role: Parallel-connected TVS on main 12V supply rail, positioned before DC-DC regulation stages. Use Value: Fast response (<5 ns) and low dynamic impedance suppress sub-microsecond EFT bursts, reducing conducted EMI into sensitive analog front-ends. | Use Scenario: Guarding USB-C PD controller and display power supplies against hot-swap and cable discharge events in center console systems. IC Role / Device Role: Secondary-level TVS on 5V/12V auxiliary rails feeding USB ports and display backlight drivers. Use Value: AEC-Q101 qualification ensures long-term reliability under thermal cycling and vibration, meeting OEM durability requirements for infotainment subsystems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ33CA | Same VWM (33V), lower PPK (400W), SMA package (smaller footprint, higher thermal resistance). | Not AEC-Q101 qualified; suitable for industrial but not automotive front-end protection. | Select SMAJ33CA only if board space is constrained and automotive qualification is unnecessary. |
| P6SMB33CA | Same VWM (33V), identical PPK (600W), SMB package (higher power rating, larger footprint than DO-15). | Broader industrial acceptance; lacks AEC-Q101 documentation despite similar construction. | Choose P6SMB33CA when higher surge margin (600W) is required and DO-15 footprint is not mandatory. |
Compared with SMAJ33CA and P6SMB33CA, SA33CAH uniquely combines AEC-Q101 qualification, DO-15 mechanical compatibility with legacy designs, and precise 500W/33V clamping performance - making it the preferred choice for Tier-1 automotive power rail protection where qualification and form-factor alignment are mandatory.
Availability
SA33CAH is available at Aetrix Electronics and suitable for automotive body electronics, industrial programmable logic controllers, LED lighting drivers, and infotainment power rail protection requiring stable component supply and long-lifecycle support.
Supply support for SA33CAH 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 Zener diodes - with global distribution and AEC-Q101-compliant production lines.
The SA Series is designed specifically for high-reliability transient suppression in automotive and industrial power systems, emphasizing robust clamping, low leakage, and mechanical ruggedness in standard axial packages.
FAQ
What does the "H" suffix in SA33CAH signify?
The "H" suffix in SA33CAH indicates full AEC-Q101 qualification per Rev G requirements, covering stress tests including high-temperature reverse bias (HTRB), temperature cycling, and mechanical shock - confirming suitability for automotive under-hood applications. SA33CAH is not merely compliant with automotive standards; it is formally certified and documented by Taiwan Semiconductor for use in safety-critical vehicle subsystems.
Is SA33CAH unidirectional or bidirectional, and how is polarity marked?
SA33CAH is a bidirectional TVS diode - it functions identically in both voltage polarities and has no cathode band or polarity marking. Unlike unidirectional SA33A variants, SA33CAH's "CA" designation confirms symmetrical avalanche characteristics, verified by identical VBR, VC, and IPPM values in positive and negative directions per datasheet Table 4.
What is the maximum clamping voltage of SA33CAH under standard surge conditions?
The maximum clamping voltage of SA33CAH is 58.1 V at 8.8 A peak pulse current (IPPM) under the 10/1000μs waveform defined in IEC 61000-4-5 and ISO 7637-2. This value is measured per standard test conditions (TA = 25°C) and remains stable across its –55°C to +175°C operating junction temperature range.
Can SA33CAH replace SA33A in an existing design?
No - SA33CAH cannot directly replace SA33A because SA33A is unidirectional (cathode-banded, asymmetric conduction), while SA33CAH is bidirectional (no polarity marking, symmetrical behavior). Substituting SA33CAH for SA33A would eliminate polarity-dependent circuit protection and may cause unintended conduction paths in DC-biased applications.
What packaging options are available for SA33CAH?
SA33CAH is supplied in tape-and-reel format: 3,500 units per reel (ordering code SA33CAH). Taiwan Semiconductor does not offer SA33CAH in ammo pack or bulk formats - only the "H"-suffixed variant is available in tape-and-reel, consistent with AEC-Q101 traceability requirements for automotive logistics.
SA33CAH 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:
- -
- 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)
SA33CAH FAQ
1.How can I place an order for SA33CAH through Aetrix?
Please submit a Request for Quotation (RFQ) for SA33CAH 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 SA33CAH reliable?
The price and inventory of SA33CAH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA33CAH is usually 5 days.
3.What payment methods are accepted for SA33CAH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA33CAH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA33CAH?
SA33CAH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA33CAH 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 SA33CAH?
For technical support, including SA33CAH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA33CAH requirements.
6.How does Aetrix verify that SA33CAH is sourced from the original manufacturer or authorized distributors?
All SA33CAH 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 SA33CAH meets industry standards.
7.What is the process for return or replacement of SA33CAH?
All SA33CAH units undergo pre-shipment inspection (PSI). If there is an issue with SA33CAH, 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 SA33CAH part is unused and in its original packaging.
Return procedure for SA33CAH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SA33CAH Tags
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