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Taiwan Semiconductor Corporation P4SMA33A
- Part No.:
- P4SMA33A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
P4SMA33A.pdf
- Description:
- TVS DIODE 28.2VWM 45.7VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,280
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Product details
Overview
P4SMA33A from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for overvoltage protection in DC power rails and signal lines. It features a 31.4–34.7 V breakdown voltage (VBR), 28.2 V working stand-off voltage (VWM), 45.7 V clamping voltage (VC) at 9.0 A peak pulse current, and 400 W peak pulse power rating under 10/1000 µs waveform - deployed in switching mode power supplies and on-board DC/DC converters.
For engineers reviewing the P4SMA33A datasheet, P4SMA33A pinout, P4SMA33A application, or P4SMA33A equivalent, key selection criteria include its DO-214AC (SMA) package compatibility, unidirectional polarity marking, sub-1 ps response time, <1 µA reverse leakage at VWM, and compliance with ISO 7637-2 Pulse 1/2a/2b/3a/3b for automotive electronics surge immunity.
Technical Context
The P4SMA33A operates as a single-die, unidirectional avalanche diode with glass-passivated junction for stable breakdown behavior and low leakage. Its clamping action begins within <1 ps of transient onset, limiting voltage excursions to ≤45.7 V during 9.0 A 10/1000 µs surges while maintaining VWM = 28.2 V to avoid interference with normal 24–28 V system operation.
Thermal performance is defined by a 150 °C maximum junction temperature and derating per Fig.2 above 25 °C ambient; mechanical construction uses UL 94V-0 molding compound and matte tin-plated leads compliant with J-STD-002 solderability and JESD 201 Class 2 whisker resistance standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR @ IT = 1.0 mA | 31.4–34.7 V - ensures reliable avalanche conduction onset without premature triggering during nominal 28 V rail operation |
| VWM | 28.2 V - maximum continuous reverse voltage before significant leakage; compatible with 24 V industrial and automotive systems |
| VC @ IPPM = 9.0 A | 45.7 V - clamped voltage during 10/1000 µs surge; protects downstream ICs rated for ≤48 V absolute maximum |
| PPPM | 400 W - peak pulse power handling per single 10/1000 µs event; supports ISO 7637-2 Pulse 1 (inductive switch-off) immunity |
| IR @ VWM | <1 µA - ultra-low reverse leakage preserves battery life and avoids false trips in always-on circuits |
| Response Time | <1 ps - enables suppression of ESD and fast transients before sensitive logic or analog circuitry is damaged |
| TJ Range | −55 to +150 °C - qualified for under-hood automotive, industrial control, and outdoor power electronics environments |
Pinout & Package
Package: DO-214AC (SMA), surface-mount, single-ended unidirectional configuration with cathode band marking. Weight: 0.060 g. Moisture sensitivity level: J-STD-020 Level 1 (unlimited floor life).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection to protected circuit ground or return path | Completes current path during transient clamp; must be routed with low-inductance trace to minimize VL = L·di/dt overshoot |
| Cathode | High-side connection to protected line (e.g., 24 V rail) | Marked by molded band; reverse-biased during normal operation; conducts avalanche current to ground during overvoltage |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR tolerance (±5% for 'A' suffix), low leakage, and long-term reliability under thermal cycling |
| ISO 7637-2 compliance | Validated for Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (line impedance coupling) in automotive ECUs |
| DO-214AC (SMA) footprint | Enables automated pick-and-place assembly; compatible with standard reflow profiles and IPC-A-610 Class 2/3 acceptance criteria |
| UL 94V-0 molding compound | Provides flame-retardant housing essential for safety-critical power supply and lighting applications |
| J-STD-020 Level 1 moisture rating | Eliminates bake requirements prior to SMT assembly, reducing manufacturing cost and cycle time |
Applications
| Switching Mode Power Supply (SMPS) | On-Board DC/DC Converter |
|---|---|
Use Scenario: Protection of primary-side MOSFET gate drivers and secondary-side rectifier outputs against flyback spikes and load-dump transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed across input/output rails to clamp voltage excursions before they exceed MOSFET VDSS or Schottky VRRM ratings. Use Value: Limits peak voltage to 45.7 V during 400 W surges, preventing catastrophic failure of 60 V-rated power semiconductors in 24 V SMPS designs. |
Use Scenario: Input rail protection for point-of-load (POL) converters in telecom base stations and industrial PLCs exposed to board-level ESD and coupling noise. IC Role / Device Role / Timing Role: Standoff device between 24 V input and POL controller IC; activated only during >28.2 V transients. Use Value: Sub-1 ps response ensures clamping before 100 ns logic-level transients disrupt digital control loops or damage PWM controllers. |
| Automotive Body Control Module (BCM) | LED Driver Power Stage |
Use Scenario: Load-dump protection on 12 V/24 V supply lines feeding microcontrollers, CAN transceivers, and sensor interfaces in BCMs. IC Role / Device Role / Timing Role: Primary overvoltage clamp on main power rail; coordinated with upstream fuses and downstream LC filters. Use Value: Meets ISO 7637-2 Pulse 1 (−150 V, 50 ms) immunity requirement when used with appropriate series impedance, enabling OEM compliance without added circuitry. |
Use Scenario: Surge suppression on constant-current LED driver inputs subjected to hot-plug events and cable discharge in architectural lighting systems. IC Role / Device Role / Timing Role: Parallel-connected TVS absorbing energy from inductive kickback during dimmer switching and lightning-induced surges. Use Value: 400 W peak power rating sustains multiple 10/1000 µs pulses without degradation, extending service life beyond 50,000 cycles in commercial installations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ33A (Bourns) | Same DO-214AA (SMB) package; 33 V VBR range (31.4–34.7 V), but 600 W PPPM and higher VC = 53.3 V at 11.3 A | Higher clamping voltage reduces margin for 48 V-rated loads; larger SMB footprint requires PCB redesign | Select when higher surge energy handling is required and layout allows SMB pad changes |
| 1.5SMC33A (ON Semiconductor) | DO-214AB (SMC) package; identical VBR/VWM/VC specs but 1500 W PPPM; 1.5x larger body and 0.33 g weight | Overqualified for 400 W use cases; excessive size limits high-density layouts in compact DC/DC modules | Select only when legacy SMC footprint is fixed or multi-pulse endurance beyond 1000 events is mandated |
Compared with SMBJ33A and 1.5SMC33A, the P4SMA33A delivers optimal balance of 400 W surge capability, DO-214AC (SMA) compactness, and 45.7 V clamping - making it preferred for space-constrained 24 V systems where strict VC headroom and automated assembly are critical.
Availability
P4SMA33A is available at Aetrix Electronics and suitable for switching mode power supplies, automotive body control modules, and LED driver power stages requiring stable component supply, consistent parametric performance, and full traceability across production batches.
Supply support for P4SMA33A 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 P4SMA33A belongs to TSC's P4SMAxx(A) family of surface-mount TVS diodes engineered specifically for robust, high-reliability overvoltage protection in harsh electromagnetic environments - emphasizing low leakage, tight VBR tolerance, and automotive-grade qualification.
FAQ
What is the polarity configuration of the P4SMA33A?
The P4SMA33A is a unidirectional TVS diode with cathode marked by a molded band on the DO-214AC (SMA) package body. It conducts only when the cathode is biased positive relative to the anode - ideal for protecting positive DC rails like 24 V supplies. Bidirectional variants require 'C' or 'CA' suffixes (e.g., P4SMA33CA), which are distinct part numbers not interchangeable with P4SMA33A.
Does the P4SMA33A meet automotive surge immunity standards?
Yes, the P4SMA33A meets ISO 7637-2 requirements for Pulse 1 (inductive load dump), Pulse 2a/2b (supply interruption), and Pulse 3a/3b (capacitive coupling) when applied with appropriate series impedance. Its 45.7 V clamping voltage at 9.0 A and 400 W peak power rating enable compliance in 12 V and 24 V automotive subsystems including body control modules and infotainment power supplies.
What is the maximum operating temperature for the P4SMA33A?
The P4SMA33A has a maximum junction temperature (TJ) of +150 °C and an operating junction temperature range of −55 to +150 °C. Derating of peak pulse power begins above 25 °C ambient per Figure 2 in the datasheet; at 125 °C ambient, the usable PPPM drops to approximately 200 W. This makes the P4SMA33A suitable for under-hood and industrial enclosure applications.
How does the 'A' suffix in P4SMA33A affect its specifications?
The 'A' suffix denotes tighter VBR tolerance: P4SMA33A has a breakdown voltage range of 31.4–34.7 V (±5%), whereas the non-'A' version P4SMA33 specifies 29.7–36.3 V (±10%). All other parameters - including VWM = 28.2 V, VC = 45.7 V, PPPM = 400 W, and package - remain identical. The 'A' grade improves design margin in precision 24 V systems.
Can the P4SMA33A be used in bidirectional signal line protection?
No, the P4SMA33A is unidirectional and unsuitable for AC or bidirectional signal lines. For such applications, select the bidirectional variant P4SMA33CA (or P4SMA33A with 'C' suffix if available), which provides symmetrical clamping in both polarities. Using P4SMA33A on AC signals risks forward conduction and permanent damage due to its inherent polarity asymmetry.
P4SMA33A 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):
- 28.2V
- Voltage - Breakdown (Min):
- 31.4V
- Voltage - Clamping (Max) @ Ipp:
- 45.7V
- Current - Peak Pulse (10/1000µs):
- 9A
- 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)
P4SMA33A FAQ
1.How can I place an order for P4SMA33A through Aetrix?
Please submit a Request for Quotation (RFQ) for P4SMA33A 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 P4SMA33A reliable?
The price and inventory of P4SMA33A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P4SMA33A is usually 5 days.
3.What payment methods are accepted for P4SMA33A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMA33A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4SMA33A?
P4SMA33A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4SMA33A 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 P4SMA33A?
For technical support, including P4SMA33A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMA33A requirements.
6.How does Aetrix verify that P4SMA33A is sourced from the original manufacturer or authorized distributors?
All P4SMA33A 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 P4SMA33A meets industry standards.
7.What is the process for return or replacement of P4SMA33A?
All P4SMA33A units undergo pre-shipment inspection (PSI). If there is an issue with P4SMA33A, 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 P4SMA33A part is unused and in its original packaging.
Return procedure for P4SMA33A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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