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Taiwan Semiconductor Corporation SA33H
- Part No.:
- SA33H
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA33H.pdf
- Description:
- 500W, 40.8V, UNIDIRECTIONAL, TVS
- Quantity:
- Payment:
- Shipping:
Inventory:8,835
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Product details
Overview
SA33H from Taiwan Semiconductor is a unidirectional 500W transient voltage suppressor (TVS) diode in DO-204AC (DO-15) package, 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 delivers AEC-Q101 qualification for automotive-grade surge protection in power supply rails and signal lines.
For engineers reviewing the SA33H datasheet, SA33H pinout, SA33H application, or SA33H equivalent, this page provides verified electrical parameters, mechanical package details, real-world use cases in automotive and industrial systems, and validated alternative parts for design flexibility and supply continuity.
Technical Context
The SA33H operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its VBR range (36.7–44.9V at 1mA test current). Its low clamping ratio (VC/VWM ≈ 1.76) ensures effective overvoltage suppression during 10/1000μs transients while maintaining <1μA leakage above 10V.
Designed for high-reliability environments, it supports junction temperatures from –55°C to +175°C, features pure tin-plated leads compliant with J-STD-002, and meets UL 94V-0 flammability and JESD201 Class 2 whisker resistance standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 36.7 V / 44.9 V at 1 mA - Confirmed breakdown threshold range defining turn-on consistency |
| VC @ IPPM | 58.1 V at 8.8 A - Clamped voltage during 10/1000μs surge, limiting downstream stress |
| PPK | 500 W - Peak pulse power handling per single non-repetitive 10/1000μs waveform |
| IR @ VWM | <1 μA - Negligible leakage current at rated stand-off voltage, minimizing standby power loss |
| TJ max | +175 °C - Enables operation in under-hood automotive and high-temperature industrial enclosures |
| Package | DO-204AC (DO-15) - Industry-standard axial leaded package with 0.400g mass and polarity band marking |
Pinout & Package
DO-204AC (DO-15) package with axial leads: Cathode marked by band; Anode and Cathode terminals defined by polarity marking. Leads are pure tin-plated, solderable per J-STD-002, and meet JESD201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., ground or return path) in unidirectional TVS configuration |
| Cathode | Reverse-biased clamping terminal | Connected to protected line (e.g., 33V rail); conducts during overvoltage to shunt surge to ground |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and body electronics requiring reliability under thermal cycling and vibration |
| 500W 10/1000μs surge rating | Withstands ISO 7637-2 Pulse 1/2a/3a and IEC 61000-4-5 Level 4 surges without degradation |
| Fast response time <1.0 ps | Clamps transients before sensitive ICs (e.g., CAN transceivers, microcontrollers) experience damaging overvoltage |
| Low clamping voltage (58.1V) | Maintains safe margin below 60V-rated components on 33V systems, reducing need for derating |
| RoHS & halogen-free | Complies with IEC 61249-2-21 and EU RoHS Directive 2011/65/EU for environmentally constrained designs |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 33V battery-fed ECUs against load dump and inductive switching spikes in passenger vehicles. IC Role / Device Role / Timing Role: Unidirectional TVS placed between 33V rail and chassis ground to clamp transients within 1ps. Use Value: Limits voltage excursion to ≤58.1V during 500W surges, preserving MCU and analog front-end integrity per ISO 16750-2. | Use Scenario: Safeguarding 4–20mA current-loop sensors in factory automation against EFT bursts and cable coupling noise. IC Role / Device Role / Timing Role: TVS mounted across sensor input terminals to absorb fast-rising transients before reaching precision op-amps. Use Value: Sub-μA leakage ensures minimal impact on loop accuracy; 58.1V clamping prevents op-amp saturation during IEC 61000-4-4 events. |
| LED Driver Overvoltage Suppression | DC-DC Converter Input Protection |
Use Scenario: Shielding constant-current LED drivers from voltage spikes induced by nearby relay switching in signage or lighting systems. IC Role / Device Role / Timing Role: SA33H placed at driver input to clamp surges before internal MOSFETs and gate drivers. Use Value: Withstands repetitive 500W pulses without parameter shift, extending driver lifetime in harsh electromagnetic environments. | Use Scenario: Guarding buck converter inputs in telecom power supplies against lightning-induced surges on 48V distribution lines. IC Role / Device Role / Timing Role: TVS connected between input rail and ground to divert energy away from controller IC and input capacitors. Use Value: 175°C max junction temperature allows placement near hot converters; DO-15 footprint enables easy layout integration. |
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-H | Same DO-214AC package; 33V VWM, 53.3V VC @ 9.8A; 400W PPK rating | Limited to 400W surge vs. SA33H's 500W; lower clamping but reduced energy handling | Preferred where board space requires SMD; not drop-in due to different package and lower power rating |
| P6SMB33AH | DO-214AA package; 33V VWM, 53.3V VC @ 9.8A; 600W PPK rating | Higher 600W rating but larger DO-214AA footprint; no AEC-Q101 qualification | Used when higher surge margin is required and AEC-Q101 is not mandatory; requires PCB redesign |
Compared with SMAJ33A-H and P6SMB33AH, the SA33H uniquely combines AEC-Q101 qualification, 500W capability in DO-15, and tight 36.7–44.9V VBR tolerance-making it optimal for space-constrained automotive modules needing certified reliability.
Availability
SA33H is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface hardening, and LED driver overvoltage suppression requiring stable component supply across production lifecycles.
Supply support for SA33H 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 for industrial and automotive markets.
The SA Series was developed specifically for high-energy transient suppression in 12V–48V automotive and industrial systems, emphasizing AEC-Q101 compliance, low clamping, and robust thermal performance in axial packages.
FAQ
What is the clamping voltage of SA33H and how is it measured?
The SA33H has a maximum clamping voltage (VC) of 58.1 V, measured at 8.8 A peak pulse current (IPPM) under the standardized 10/1000 μs double-exponential surge waveform. This value is guaranteed per the manufacturer's test conditions in the SA Series datasheet and reflects worst-case voltage seen by downstream circuitry during a full-power transient event.
Is SA33H unidirectional or bidirectional, and how is polarity identified?
The SA33H is a unidirectional TVS diode. Polarity is indicated by a cathode band on the DO-204AC (DO-15) package body - the banded end connects to the protected line (e.g., 33V rail), while the unbanded end connects to ground. Bidirectional variants in the SA Series carry "CA" suffixes (e.g., SA33CA), which SA33H does not.
Does SA33H meet automotive qualification standards?
Yes, SA33H is explicitly AEC-Q101 qualified, as confirmed in the SA Series documentation (Version L2105). This certification covers stress tests including high-temperature operating life, temperature cycling, and mechanical shock - validating its suitability for under-hood and body-control module applications.
What is the maximum junction temperature rating for SA33H?
The SA33H has a maximum junction temperature (TJ MAX) rating of +175°C, enabling reliable operation in high-ambient environments such as engine compartments or enclosed industrial drives. This rating is maintained across its full operating range (–55°C to +175°C) and supports long-term stability under thermal cycling.
How does SA33H compare to SA33A in terms of electrical performance?
The SA33H and SA33A share identical VWM (33 V), VBR (36.7–44.9 V), and VC (58.1 V) specifications, but SA33H adds AEC-Q101 qualification and uses green molding compound (per marking code "G"). SA33A lacks automotive qualification and is intended for commercial/industrial use only - making SA33H the appropriate choice for automotive designs.
SA33H 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:
- 58.1V
- Current - Peak Pulse (10/1000µs):
- 8.8A
- 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)
SA33H FAQ
1.How can I place an order for SA33H through Aetrix?
Please submit a Request for Quotation (RFQ) for SA33H 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 SA33H reliable?
The price and inventory of SA33H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA33H is usually 5 days.
3.What payment methods are accepted for SA33H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA33H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA33H?
SA33H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA33H 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 SA33H?
For technical support, including SA33H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA33H requirements.
6.How does Aetrix verify that SA33H is sourced from the original manufacturer or authorized distributors?
All SA33H 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 SA33H meets industry standards.
7.What is the process for return or replacement of SA33H?
All SA33H units undergo pre-shipment inspection (PSI). If there is an issue with SA33H, 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 SA33H part is unused and in its original packaging.
Return procedure for SA33H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SA33H Tags
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