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Taiwan Semiconductor Corporation P4SMA33
- Part No.:
- P4SMA33
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
P4SMA33.pdf
- Description:
- 400W, 33V, 10%, UNIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:3,954
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Product details
Overview
P4SMA33 from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, designed for overvoltage protection in DC power rails. It features a 29.7–36.3 V breakdown voltage (VBR), 26.8 V working stand-off voltage (VWM), 47.7 V clamping voltage (VC) at 8.8 A peak pulse current, and 400 W peak pulse power rating under 10/1000 µs waveform - ideal for protecting SMPS outputs and DC/DC converter inputs against ESD and surge events.
For engineers reviewing the P4SMA33 datasheet, P4SMA33 pinout, P4SMA33 application, or P4SMA33 equivalent, key selection criteria include its unidirectional polarity, 1 µA max reverse leakage at VWM, -55°C to +150°C operating junction temperature range, and compliance with ISO 7637-2 Pulse 1/2a/2b/3a/3b for automotive load-dump immunity.
Technical Context
The P4SMA33 operates as a silicon avalanche diode, clamping transient voltages above its breakdown threshold via controlled avalanche conduction. Its glass-passivated junction ensures stable VBR tolerance (±5% for 'A' variant, ±10% for standard), low temperature coefficient (0.098 %/°C), and fast response (<1.0 ps). It is rated for non-repetitive 400 W peak pulse power per 10/1000 µs waveform and supports up to 40 A IFSM surge current (8.3 ms half-sine).
Designed for unidirectional use only, the device exhibits polarity-marked cathode band per DO-214AC mechanical outline. Its 1 µA max IR at 26.8 V enables low-power standby compatibility, while UL 94V-0 molding compound and JESD201 Class 2 whisker resistance support high-reliability industrial assembly.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR @ IT=1.0 mA | 29.7–36.3 V - defines minimum/maximum voltage at which avalanche conduction begins; determines protection threshold accuracy |
| VWM | 26.8 V - maximum continuous DC or RMS voltage the device blocks without significant leakage |
| VC @ IPPM=8.8 A | 47.7 V - clamped voltage during 10/1000 µs surge; sets upper limit of protected circuit stress |
| PPPM | 400 W - peak pulse power handling capability; validates robustness against ISO 7637-2 Pulse 3b (100 V/1 Ω) |
| IR @ VWM | ≤1 µA - ensures negligible standby current draw in always-on systems like automotive ECUs |
| TJ Range | -55°C to +150°C - supports operation in under-hood automotive and industrial ambient environments |
Pinout & Package
Package: DO-214AC (SMA), surface-mount, single-diode configuration with cathode band marking. Dimensions conform to JEDEC DO-214AC standard; terminals are matte tin-plated for J-STD-002 solderability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input/Line side | Connected to protected line (e.g., DC input rail); conducts during forward surge or bidirectional variants (not applicable here) |
| Cathode | Output/Load side | Connected to ground or return path; avalanche conduction occurs when line-to-ground voltage exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR over time and temperature; eliminates risk of junction degradation during repeated surges |
| Fast response time <1.0 ps | Clamps transients before downstream ICs experience damaging overvoltage - critical for protecting sensitive MCU I/O or PMIC inputs |
| ISO 7637-2 compliance | Validated for automotive electrical system immunity including Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling) |
| Moisture sensitivity level 1 | Enables unlimited floor life before reflow; eliminates bake requirements and simplifies SMT line integration |
Applications
| Switching Mode Power Supply (SMPS) | On-board DC/DC Converter |
|---|---|
Use Scenario: Protecting secondary-side output rails of AC/DC adapters or isolated flyback converters against load-dump and ESD events. IC Role / Device Role: Unidirectional TVS placed between output rail and ground to clamp positive-going transients. Use Value: Limits output voltage excursion to ≤47.7 V during 400 W surges, preventing damage to downstream 3.3 V/5 V LDOs or microcontrollers. | Use Scenario: Safeguarding input stage of point-of-load (POL) buck converters in telecom or server boards exposed to board-level ESD. IC Role / Device Role: Input-side TVS on 12 V or 24 V bus feeding the DC/DC controller. Use Value: Withstands 8.8 A peak impulse current while maintaining ≤1 µA leakage at 26.8 V, preserving efficiency in always-on systems. |
| Lighting Application | Automotive Body Control Module (BCM) |
Use Scenario: Overvoltage protection for LED driver ICs in streetlight or automotive headlamp modules subjected to cable discharge events. IC Role / Device Role: Parallel-connected TVS across LED string supply to absorb fast-rising transients from relay switching or inductive loads. Use Value: 0.098 %/°C VBR tempco ensures consistent clamping across -40°C to +125°C ambient, critical for outdoor lighting reliability. | Use Scenario: Input rail protection in BCMs receiving power from vehicle battery subject to load-dump pulses per ISO 7637-2 Pulse 5a. IC Role / Device Role: Primary front-end TVS on 12 V main power input before fuse and regulator stages. Use Value: 400 W peak power rating meets ISO 7637-2 Pulse 5a (100 V/2 Ω) requirement; UL 94V-0 package prevents flame propagation in enclosed modules. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ33A | 600 W peak power, DO-214AA (SMB) package, tighter VBR tolerance (±5%), 53.3 V VC @ 11.3 A | Higher power handling but larger footprint; better suited for higher-energy surges where PCB space allows | Select SMBJ33A when surge energy exceeds 400 W or when design requires margin beyond ISO 7637-2 Pulse 5a |
| 1.5SMC33A | 1500 W peak power, DO-214AB (SMC) package, 53.3 V VC @ 28.3 A, higher thermal mass | Designed for primary-side AC/DC or high-energy industrial transients; not optimized for compact DC/DC layouts | Choose 1.5SMC33A only if system-level testing confirms need for >400 W clamping and SMC footprint is acceptable |
Compared with P4SMA33, SMBJ33A offers higher surge capacity in a slightly larger package, while 1.5SMC33A delivers threefold power rating at the cost of board area and thermal response speed - making P4SMA33 optimal for space-constrained, medium-energy DC rail protection.
Availability
P4SMA33 is available at Aetrix Electronics and suitable for switching mode power supplies, on-board DC/DC converters, and automotive body control modules requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for P4SMA33 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, automotive, and consumer applications.
The P4SMA series belongs to TSC's surface-mount TVS portfolio engineered specifically for high-reliability, automated assembly in automotive-grade and industrial power systems - emphasizing low leakage, tight VBR tolerance, and rigorous AEC-Q200-aligned qualification.
FAQ
What is the breakdown voltage range of the P4SMA33?
The P4SMA33 has a specified breakdown voltage (VBR) range of 29.7 V to 36.3 V at 1.0 mA test current, measured per ANSI/IEEE C62.35. This ±10% tolerance reflects its standard-grade unidirectional TVS classification. The value ensures reliable clamping initiation across manufacturing lots and temperature extremes while maintaining compatibility with 24 V nominal systems.
Is the P4SMA33 suitable for bidirectional transient protection?
No, the P4SMA33 is a unidirectional TVS diode intended for DC line-to-ground protection only. For bidirectional applications such as AC signal lines or data buses, TSC offers the P4SMA33C or P4SMA33CA variants - which include symmetrical breakdown characteristics and dual avalanche junctions. Using P4SMA33 in reverse-biased AC configurations may result in forward conduction and failure.
What is the maximum clamping voltage of the P4SMA33 under surge conditions?
The P4SMA33 exhibits a maximum clamping voltage (VC) of 47.7 V when subjected to an 8.8 A peak pulse current with a 10/1000 µs waveform. This value represents the upper voltage limit imposed on the protected circuit during standardized surge events and is critical for ensuring downstream components remain within their absolute maximum ratings.
Does the P4SMA33 meet automotive EMC standards?
Yes, the P4SMA33 is explicitly rated to meet ISO 7637-2 for automotive transient immunity, covering Pulse 1 (inductive switch-off), Pulse 2a/2b (battery interruption), and Pulse 3a/3b (capacitive coupling). Its 400 W peak power rating and 47.7 V clamping voltage enable compliance with these waveforms when properly mounted with low-inductance layout practices.
What packaging and reel quantity is offered for the P4SMA33?
The P4SMA33 is supplied in DO-214AC (SMA) package on 7,500-piece tape-and-reel format, optimized for high-speed pick-and-place assembly. The reel complies with EIA-481-D standards, and each unit carries the marking code "BSJ" laser-etched on the cathode band for traceability and voltage identification.
P4SMA33 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AC, SMA
- Series:
- P4SMA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 26.8V
- Voltage - Breakdown (Min):
- 29.7V
- Voltage - Clamping (Max) @ Ipp:
- 47.7V
- Current - Peak Pulse (10/1000µs):
- 8.8A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
P4SMA33 FAQ
1.How can I place an order for P4SMA33 through Aetrix?
Please submit a Request for Quotation (RFQ) for P4SMA33 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 P4SMA33 reliable?
The price and inventory of P4SMA33 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P4SMA33 is usually 5 days.
3.What payment methods are accepted for P4SMA33?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMA33 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4SMA33?
P4SMA33 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4SMA33 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 P4SMA33?
For technical support, including P4SMA33 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMA33 requirements.
6.How does Aetrix verify that P4SMA33 is sourced from the original manufacturer or authorized distributors?
All P4SMA33 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 P4SMA33 meets industry standards.
7.What is the process for return or replacement of P4SMA33?
All P4SMA33 units undergo pre-shipment inspection (PSI). If there is an issue with P4SMA33, 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 P4SMA33 part is unused and in its original packaging.
Return procedure for P4SMA33:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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