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Taiwan Semiconductor Corporation SA33AH
- Part No.:
- SA33AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA33AH.pdf
- Description:
- TVS DIODE 33VWM 71.4VC DO204AC
- Quantity:
- Payment:
- Shipping:
Inventory:9,011
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Product details
Overview
SA33AH from Taiwan Semiconductor is a unidirectional 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 clamping voltage (VC) at 8.8A peak pulse current. It protects automotive power rails and ECU inputs against ISO 7637-2 load dump and EFT transients.
For engineers reviewing the SA33AH datasheet, SA33AH pinout, SA33AH application, or SA33AH equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, clamping performance under standardized surge waveforms, thermal derating behavior, and direct alternatives for automotive-grade overvoltage protection design.
Technical Context
The SA33AH implements a silicon avalanche junction structure optimized for fast response (<1.0ps rise to VBR) and low dynamic impedance during transient events. Its unidirectional configuration provides polarity-specific clamping with cathode-band marking, and it operates across –55°C to +175°C junction temperature range.
Designed for automotive environments, SA33AH meets AEC-Q101 stress test requirements including high-temperature operating life, temperature cycling, and mechanical shock. Its 500W surge rating applies to non-repetitive 10/1000μs pulses, with linear derating above 25°C ambient per Fig.2 in the datasheet.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33 V - Maximum continuous reverse voltage before clamping begins; sets minimum system operating margin for 24V automotive supply rails. |
| VBR min/max | 36.7 V / 44.9 V at 1 mA - Confirmed breakdown threshold range ensures reliable turn-on during transients without premature conduction. |
| VC @ IPPM | 58.1 V at 8.8 A - Clamping voltage limits downstream IC stress during 10/1000μs surge; enables robust protection of 36V-rated components. |
| PPK | 500 W - Peak pulse power handling per single 10/1000μs waveform; validated per IEC 61000-4-5 and ISO 7637-2 Annex D. |
| TJ max | +175 °C - Maximum junction temperature supports under-hood placement near engine control units without thermal derating penalties. |
| IR @ VWM | <1 μA - Ultra-low leakage preserves battery drain budget in always-on vehicle modules such as body controllers and telematics. |
Pinout & Package
SA33AH uses the DO-204AC (DO-15) axial-leaded package with cathode band marking on the anode-side end. 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 (banded end) | Transient return path | Connected to ground or low-impedance return plane; carries full surge current during clamping event. |
| Cathode (non-banded end) | Protected line connection | Connected to protected circuit node (e.g., LIN bus input or sensor supply); clamps to anode when voltage exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive use per stress test requirements including HTOL, TC, and mechanical shock-enables drop-in integration into ASIL-B/C systems. |
| 500W 10/1000μs surge rating | Withstands ISO 7637-2 Pulse 5a (load dump) up to 120V for 400ms without degradation when used with appropriate series impedance. |
| Clamping voltage ≤58.1V | Ensures protected 3.3V/5V microcontrollers and CAN transceivers remain within absolute maximum ratings during worst-case transients. |
| Response time <1.0ps | Activates before most semiconductor damage mechanisms initiate, providing effective protection against ESD and EFT events per IEC 61000-4-2/4. |
| RoHS & halogen-free | Complies with IEC 61249-2-21 and EU RoHS Directive 2011/65/EU-supports green manufacturing and end-of-life recycling requirements. |
Applications
| Automotive Power Rail Protection | LIN Bus Transient Suppression |
|---|---|
Use Scenario: Protecting 24V battery-fed ECUs from load dump transients (ISO 7637-2 Pulse 5a) and alternator switching spikes. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and chassis ground to clamp surges above 33V while remaining inert during normal operation. Use Value: Limits peak rail voltage to ≤58.1V during 500W transients, preventing latch-up or gate oxide rupture in downstream PMICs and microcontrollers. | Use Scenario: Shielding LIN transceiver inputs (e.g., TJA1020) from coupled noise and EFT bursts in body electronics networks. IC Role / Device Role / Timing Role: Bidirectional-capable unidirectional device (cathode tied to LIN line, anode to ground) clamps both positive and negative transients relative to ground reference. Use Value: Maintains signal integrity by suppressing ±30kV ESD (IEC 61000-4-2) and ±2kV EFT (IEC 61000-4-4) without distorting LIN's 19.2kbps timing window. |
| Engine Control Unit Input Protection | Body Control Module Sensor Interface |
Use Scenario: Safeguarding analog sensor inputs (e.g., MAP, IAT) connected to MCU ADC channels in high-temperature engine compartments. IC Role / Device Role / Timing Role: Low-leakage (≤1μA) TVS placed at connector entry point to shunt transients before reaching precision amplifier front-ends. Use Value: Prevents ADC offset drift and saturation caused by sub-10ns ESD events while adding <0.1% gain error due to negligible DC loading. | Use Scenario: Protecting digital switch inputs (e.g., door lock actuator feedback) from inductive kickback in 12V body control modules. IC Role / Device Role / Timing Role: Fast-clamping TVS installed across relay coil or switch contact to absorb energy from L·di/dt events. Use Value: Extends relay contact life by limiting flyback voltage to ≤58.1V, reducing arcing and contact erosion during 70A surge current events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ33A | Same DO-214AC package; 33V VWM, 53.3V VC @ 9.8A; lower PPK (400W); no AEC-Q101 qualification. | Not qualified for automotive under-hood use; suitable for industrial or consumer-grade 24V systems with less stringent reliability requirements. | Select SMAJ33A only if AEC-Q101 compliance is not required and 400W surge capacity suffices for system-level testing. |
| 1.5KE33CA | DO-201AD package; bidirectional; 33V VWM, 53.3V VC @ 9.8A; 1500W PPK; AEC-Q101 not claimed. | Higher surge rating but larger footprint; bidirectional operation requires different grounding strategy; lacks automotive qualification documentation. | Choose 1.5KE33CA only when bidirectional clamping is mandatory and PCB layout allows DO-201AD mounting with adequate thermal relief. |
Compared with SMAJ33A and 1.5KE33CA, SA33AH uniquely combines AEC-Q101 qualification, DO-15 form factor, and 500W 10/1000μs capability-making it the only option certified for direct integration into production automotive ECUs without additional qualification effort.
Availability
SA33AH is available at Aetrix Electronics and suitable for automotive electronic control units, body control modules, and LIN bus interface designs requiring stable component supply with full AEC-Q101 traceability and long-term lifecycle support.
Supply support for SA33AH 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 TVS diodes, rectifiers, MOSFETs, and power management devices.
The SA Series was developed specifically for automotive-grade transient suppression, targeting ISO 7637-2 and IEC 61000-4 compliance in engine control, lighting, and body electronics applications.
FAQ
What is the AEC-Q101 qualification status of SA33AH?
SA33AH is explicitly AEC-Q101 qualified per the manufacturer's ordering code suffix "H" and datasheet Version L2105. This includes full stress testing for high-temperature operating life, temperature cycling, and mechanical shock-validating its suitability for automotive under-hood applications where reliability is critical. The qualification applies directly to the SA33AH part number, not just the SA family.
Does SA33AH support bidirectional transient suppression?
No, SA33AH is a unidirectional TVS diode, indicated by absence of "C" or "CA" suffix and confirmed by cathode-band marking per DO-204AC mechanical drawing. It clamps only positive transients on the cathode side relative to anode (ground). For bidirectional protection, SA33A or SA33CA variants must be selected instead.
What is the maximum clamping voltage of SA33AH and at what current is it specified?
The maximum clamping voltage (VC) of SA33AH is 58.1 V, measured at 8.8 A peak pulse current (IPPM) under the standard 10/1000μs waveform. This value is guaranteed across the full operating temperature range and defines the upper voltage limit imposed on protected circuits during surge events.
Can SA33AH be used in place of SA33A in an existing design?
SA33AH and SA33A share identical electrical parameters (VWM = 33 V, VBR = 36.7–44.9 V, VC = 58.1 V) and DO-204AC packaging, but SA33AH adds AEC-Q101 qualification and enhanced process controls. Substitution is electrically safe and mechanically identical; however, SA33AH should be used where automotive qualification documentation and traceability are required.
What is the thermal derating behavior of SA33AH above 25°C ambient?
SA33AH follows the pulse derating curve in Fig.2 of the datasheet: peak pulse power decreases linearly from 500W at 25°C to ~250W at 100°C ambient. At 125°C, derated PPK drops to approximately 125W. Designers must apply this curve when sizing series impedance or estimating duty cycle limits for repetitive surge conditions.
SA33AH 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):
- 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)
SA33AH FAQ
1.How can I place an order for SA33AH through Aetrix?
Please submit a Request for Quotation (RFQ) for SA33AH 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 SA33AH reliable?
The price and inventory of SA33AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA33AH is usually 5 days.
3.What payment methods are accepted for SA33AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA33AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA33AH?
SA33AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA33AH 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 SA33AH?
For technical support, including SA33AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA33AH requirements.
6.How does Aetrix verify that SA33AH is sourced from the original manufacturer or authorized distributors?
All SA33AH 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 SA33AH meets industry standards.
7.What is the process for return or replacement of SA33AH?
All SA33AH units undergo pre-shipment inspection (PSI). If there is an issue with SA33AH, 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 SA33AH part is unused and in its original packaging.
Return procedure for SA33AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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