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Taiwan Semiconductor Corporation P4SMA75
- Part No.:
- P4SMA75
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
P4SMA75.pdf
- Description:
- 400W, 75V, 10%, UNIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:8,888
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Product details
Overview
P4SMA75 from Taiwan Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in DO-214AC (SMA) package, designed for primary overvoltage protection in DC power rails. It features a 67.5–82.5 V breakdown voltage (VBR), 60.7 V working stand-off voltage (VWM), 108 V maximum clamping voltage (VC) at 3.8 A peak pulse current, and 400 W peak pulse power rating under 10/1000 µs waveform - suitable for protecting switching mode power supplies and on-board DC/DC converters against ESD and surge transients.
For engineers reviewing the P4SMA75 datasheet, P4SMA75 pinout, P4SMA75 application, or P4SMA75 equivalent, key selection criteria include its unidirectional polarity, 1 µA max reverse leakage at VWM, -55°C to +150°C operating junction temperature range, compliance with ISO 7637-2 Pulse 1/2a/2b/3a/3b, and UL 94V-0 mold compound - all critical for automotive-grade and industrial power rail protection design.
Technical Context
The P4SMA75 operates as a silicon avalanche diode with glass-passivated junction, enabling fast response time (<1.0 ps) and stable clamping performance across temperature. Its single-die unidirectional configuration provides asymmetric conduction: low forward voltage (3.5 V at 25 A) during fault conditions and high impedance in reverse bias until VBR is exceeded.
Thermal derating follows JESD22-A104 guidelines, with peak power reduced linearly above 25°C ambient per Fig.2; junction-to-ambient thermal resistance is optimized by the DO-214AC package's leadframe geometry and matte tin-plated terminals compliant with J-STD-002 solderability standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR @ IT = 1.0 mA | 67.5–82.5 V - defines minimum and maximum voltage at which avalanche conduction begins; ensures consistent turn-on across production lots |
| VWM | 60.7 V - maximum continuous reverse voltage before significant leakage; sets safe operating margin below VBR |
| VC @ IPPM = 3.8 A | 108 V - clamped voltage during 10/1000 µs surge; determines protected circuit's maximum transient exposure |
| IR @ VWM | ≤1 µA - reverse leakage current at stand-off voltage; guarantees minimal power loss and signal integrity in standby |
| PPPM | 400 W - peak pulse power handling capability; supports robust protection against ISO 7637-2 Pulse 1/2a/2b/3a/3b events |
| TJMAX | +150°C - maximum junction temperature; enables operation in high-ambient environments like engine control units |
| Package | DO-214AC (SMA) - industry-standard surface-mount outline with cathode band marking; compatible with automated pick-and-place |
Pinout & Package
DO-214AC (SMA) package: molded epoxy case with matte tin-plated leads, polarity indicated by cathode band. Weight ≈ 0.060 g. Meets UL 94V-0 flammability and JESD201 Class 2 whisker resistance requirements.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to system ground or low-side return path; conducts during positive transients when cathode is at higher potential |
| Cathode | Reverse-biased terminal | Connected to protected line (e.g., 48 V rail); blocks normal operation but avalanches into low-impedance state during overvoltage |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated junction | Enables stable VBR tolerance and long-term reliability under thermal cycling and humidity stress |
| Clamping voltage ≤108 V at 3.8 A | Ensures downstream ICs rated for ≤120 V absolute maximum survive ISO 7637-2 Pulse 2b (inductive load dump) |
| Response time <1.0 ps | Fast enough to suppress ESD events (IEC 61000-4-2) before damage occurs to sensitive analog or digital inputs |
| Moisture sensitivity level 1 | Allows unlimited floor life before reflow; eliminates baking requirement and simplifies SMT manufacturing flow |
| RoHS & halogen-free compliance | Fulfills EU Directive 2011/65/EU and IEC 61249-2-21 requirements for environmentally constrained applications |
Applications
| Automotive Power Rail Protection | Industrial SMPS Input Stage |
|---|---|
|
Use Scenario: Protecting 48 V battery-fed ECUs against load dump transients up to 120 V per ISO 7637-2 Pulse 5a. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power input and ground to clamp surges before they reach DC/DC controller ICs. Use Value: With VC = 108 V at 3.8 A, P4SMA75 limits transient exposure below typical 120 V absolute max ratings of buck controllers like LM5164. |
Use Scenario: Safeguarding AC-DC adapter output rails against lightning-induced surges and switching noise. IC Role / Device Role / Timing Role: Primary overvoltage clamp on secondary-side 24 V or 48 V outputs, coordinated with Y-capacitor and common-mode choke filtering. Use Value: 400 W peak power rating sustains multiple 10/1000 µs pulses without degradation, supporting EN 61000-4-5 Level 3 immunity. |
| LED Driver Overvoltage Clamp | On-Board DC/DC Converter Input |
|
Use Scenario: Preventing catastrophic failure of constant-current LED drivers during hot-swap or cable discharge events. IC Role / Device Role / Timing Role: Fast-acting shunt device across driver input capacitor to divert >60 V transients away from internal MOSFETs and gate drivers. Use Value: 1 µA leakage at 60.7 V ensures no impact on driver efficiency or dimming accuracy during normal operation. |
Use Scenario: Securing 12 V or 24 V inputs to point-of-load regulators in telecom base stations and industrial PLCs. IC Role / Device Role / Timing Role: First-line defense upstream of input EMI filter and bulk capacitor, absorbing coupled transients from adjacent switching circuits. Use Value: DO-214AC footprint allows placement near connector entry points with minimal trace inductance, preserving <1.0 ps response advantage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ75A (Bourns) | Bidirectional variant; VBR = 83.3–92.1 V; same DO-214AA (SMB) package but larger footprint than DO-214AC | Required where bidirectional protection is needed (e.g., data lines), not suitable for unidirectional DC rail use without redesign | Select only if bidirectional clamping and higher VBR tolerance are required; PCB layout change needed due to SMB vs SMA pad dimensions |
| 1.5SMC75A (ON Semiconductor) | Same unidirectional function; VBR = 71.3–78.8 V; DO-214AB (SMC) package with 2.54 mm lead spacing vs SMA's 2.29 mm | Higher power rating (1500 W) but larger footprint; better for high-energy surges where space permits | Choose when surge energy exceeds 400 W capability and board area allows SMC package; not drop-in due to different land pattern and height |
Compared with P4SMA75, SMBJ75A offers bidirectional protection at higher VBR but requires PCB redesign, while 1.5SMC75A delivers greater surge capacity in a larger package - making P4SMA75 optimal for space-constrained, unidirectional 48–60 V rail protection where DO-214AC compatibility and 400 W rating suffice.
Availability
P4SMA75 is available at Aetrix Electronics and suitable for automotive power rail protection, industrial SMPS input stages, and LED driver overvoltage clamping requiring stable component supply, full traceability, and RoHS/halogen-free compliance.
Supply support for P4SMA75 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, with ISO 9001 and IATF 16949 certified facilities.
The P4SMA75 belongs to TSC's P4SMAx series of 400 W surface-mount TVS diodes engineered for automotive and industrial DC power line protection, emphasizing reliability under thermal stress and compliance with ISO 7637-2 and AEC-Q101 pre-qualification requirements.
FAQ
What is the polarity configuration of P4SMA75?
The P4SMA75 is a unidirectional TVS diode, with cathode marked by a band on the DO-214AC package body. It conducts only when the cathode is at a higher potential than the anode - making it suitable for DC rail protection where polarity is fixed. Bidirectional variants (e.g., P4SMA75A) exist but are distinct part numbers; P4SMA75 must be oriented correctly in-circuit to avoid forward conduction during normal operation.
Does P4SMA75 meet automotive surge immunity standards?
Yes, P4SMA75 meets ISO 7637-2 Pulse 1 (capacitive coupled), Pulse 2a (battery disconnect), Pulse 2b (inductive load dump), Pulse 3a (switching noise), and Pulse 3b (ignition noise) requirements. Its 400 W peak pulse power rating and 108 V clamping voltage at 3.8 A ensure compliance when used with appropriate series impedance, as verified in TSC's application notes for automotive ECU front-end protection.
What is the maximum reverse leakage current for P4SMA75 at its working voltage?
The maximum reverse leakage current (IR) for P4SMA75 is 1 µA when biased at its working stand-off voltage (VWM) of 60.7 V and measured at 25°C. This ultra-low leakage preserves system efficiency and prevents false triggering in high-impedance monitoring circuits - a key advantage over higher-leakage alternatives in battery-powered or energy-sensitive designs.
Can P4SMA75 be used in place of P4SMA75A?
No, P4SMA75 and P4SMA75A are not interchangeable without validation. P4SMA75 has VBR = 67.5–82.5 V and VWM = 60.7 V, while P4SMA75A has tighter VBR = 71.3–78.8 V and VWM = 64.1 V. The A-suffix version offers improved VBR tolerance (±5% vs ±10%), resulting in higher minimum clamping margin - substituting one for the other may compromise surge margin or cause premature conduction.
What is the thermal derating behavior of P4SMA75 above 25°C ambient?
P4SMA75 follows linear thermal derating per Figure 2 in the datasheet: peak pulse power decreases from 400 W at 25°C to approximately 200 W at 100°C ambient. This reflects junction-to-ambient thermal resistance inherent to the DO-214AC package; designers must apply this curve when sizing for high-temperature enclosures or under-hood automotive locations to maintain clamping performance during sustained surge events.
P4SMA75 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):
- 60.7V
- Voltage - Breakdown (Min):
- 67.5V
- Voltage - Clamping (Max) @ Ipp:
- 108V
- Current - Peak Pulse (10/1000µs):
- 3.8A
- 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)
P4SMA75 FAQ
1.How can I place an order for P4SMA75 through Aetrix?
Please submit a Request for Quotation (RFQ) for P4SMA75 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 P4SMA75 reliable?
The price and inventory of P4SMA75 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P4SMA75 is usually 5 days.
3.What payment methods are accepted for P4SMA75?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMA75 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4SMA75?
P4SMA75 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4SMA75 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 P4SMA75?
For technical support, including P4SMA75 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMA75 requirements.
6.How does Aetrix verify that P4SMA75 is sourced from the original manufacturer or authorized distributors?
All P4SMA75 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 P4SMA75 meets industry standards.
7.What is the process for return or replacement of P4SMA75?
All P4SMA75 units undergo pre-shipment inspection (PSI). If there is an issue with P4SMA75, 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 P4SMA75 part is unused and in its original packaging.
Return procedure for P4SMA75:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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