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Taiwan Semiconductor Corporation P4SMA51C
- Part No.:
- P4SMA51C
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
P4SMA51C.pdf
- Description:
- 400W, 51V, 10%, BIDIRECTIONAL, T
- Quantity:
- Payment:
- Shipping:
Inventory:4,745
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Product details
Overview
P4SMA51C from Taiwan Semiconductor is a unidirectional 400W surface-mount transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, with 41.3V working stand-off voltage, 45.9–56.1V breakdown voltage at 1mA, and 73.5V maximum clamping voltage at 5.7A peak pulse current. It protects DC/DC converters and SMPS inputs against ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.
For engineers reviewing the P4SMA51C datasheet, P4SMA51C pinout, P4SMA51C application, or P4SMA51C equivalent, key selection criteria include clamping performance under 10/1000μs surge, junction temperature derating above 25°C, unidirectional polarity marking, and compliance with J-STD-020 Level 1 moisture sensitivity.
Technical Context
The P4SMA51C uses a glass-passivated silicon junction optimized for fast transient response (<1.0ps) and low leakage (<1μA at 41.3V). Its unidirectional configuration provides asymmetric conduction-low forward voltage (3.5V at 25A) during overvoltage clamping while blocking reverse current until breakdown threshold is exceeded.
Thermal design requires adherence to derating curves: peak power drops from 400W at 25°C ambient to ~240W at 85°C, with maximum junction temperature limited to +150°C. The device meets ISO 7637-2 for automotive load-dump and inductive-switching immunity testing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 41.3 V - Maximum continuous reverse voltage before significant leakage; sets system operating margin below clamping onset. |
| VBR min/max | 45.9–56.1 V @ 1mA - Breakdown range defines turn-on consistency across production lots and temperature. |
| VC @ IPPM | 73.5 V @ 5.7A (10/1000μs) - Clamping voltage determines worst-case stress on downstream ICs during surge events. |
| PPPM | 400 W - Peak pulse power rating establishes single-event energy handling capability per IEC 61000-4-5. |
| IR @ VWM | <1 μA - Ultra-low leakage preserves efficiency in high-impedance bias networks and battery-powered circuits. |
| TJ max | +150 °C - Enables operation in under-hood automotive or enclosed industrial power supplies without forced cooling. |
| Package | DO-214AC (SMA) - Standardized surface-mount outline compatible with automated pick-and-place and reflow profiles. |
Pinout & Package
DO-214AC (SMA) package: molded epoxy case with matte tin-plated leads; cathode indicated by band marking; polarity-critical for unidirectional operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference node | Connected to ground or return path; must be routed with low-inductance trace to sustain clamping speed. |
| Cathode | Protected line input | Connected to supply rail (e.g., 48V DC bus); band-marked end accepts transient energy during overvoltage. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR over lifetime and humidity exposure; eliminates need for conformal coating in humid environments. |
| Fast response time <1.0ps | Clamps ESD and lightning-induced surges before sensitive logic or gate drivers are damaged. |
| UL 94V-0 molding compound | Prevents flame propagation in fault conditions, satisfying safety requirements for Class II power supplies. |
| J-STD-020 Level 1 moisture sensitivity | Allows unlimited floor life before reflow; eliminates baking requirement and reduces assembly cost. |
| ISO 7637-2 compliance | Validated for automotive electronics including infotainment head units and body control modules. |
Applications
| On-board DC/DC Converter | Switching Mode Power Supply (SMPS) |
|---|---|
Use Scenario: Input protection for 48V-to-12V isolated buck converter in telecom shelf power. IC Role / Device Role / Timing Role: Unidirectional TVS placed at primary-side input to clamp load-dump spikes from upstream 48V bus. Use Value: Limits transient voltage to ≤73.5V, preventing damage to primary-side controller ICs rated for 80V absolute maximum. |
Use Scenario: Secondary-side output rail protection in AC/DC adapter supplying USB-C PD devices. IC Role / Device Role / Timing Role: Standoff-rated TVS on +20V auxiliary output to absorb coupling noise from high-frequency transformer leakage. Use Value: Sub-1μA leakage avoids loading feedback divider network; clamping action preserves ±5% output regulation during conducted EFT bursts. |
| Lighting Application | Automotive Body Control Module |
Use Scenario: Overvoltage suppression on constant-current LED driver input in streetlight fixture. IC Role / Device Role / Timing Role: Primary-side TVS absorbing induced surges from nearby lightning strikes on outdoor cabling. Use Value: 400W peak power rating sustains multiple 10/1000μs pulses without degradation, extending field life beyond 10 years. |
Use Scenario: CAN bus power rail protection in BCM controlling door locks and interior lighting. IC Role / Device Role / Timing Role: Unidirectional TVS on 12V supply feeding CAN transceiver and microcontroller. Use Value: Meets ISO 7637-2 Pulse 3b (capacitive coupling), ensuring CAN communication remains intact during ignition switching events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ51A | Bidirectional variant; same VBR (48.5–53.6V), but symmetrical clamping in both polarities. | Required where reverse-polarity connection risk exists or AC-coupled signal lines need protection. | Select SMBJ51A only if bidirectional clamping is explicitly needed; P4SMA51C offers lower cost and tighter VWM for DC-only rails. |
| 1.5KE51C | Through-hole TO-204AA (DO-41); higher 1500W PPPM but larger footprint and no SMT compatibility. | Suitable for prototyping or legacy through-hole designs; not viable for high-density PCBs. | Choose 1.5KE51C only when board space allows axial-leaded parts and manual assembly is acceptable. |
Compared with SMBJ51A and 1.5KE51C, the P4SMA51C delivers optimal balance of SMT manufacturability, 400W surge capacity, and precise 41.3V standoff for modern compact DC power systems-without sacrificing thermal robustness or automotive qualification.
Availability
P4SMA51C 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 across extended production cycles.
Supply support for P4SMA51C 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, and MOSFETs for industrial and automotive markets.
The P4SMA series was developed specifically for surface-mount transient suppression in space-constrained power conversion systems, emphasizing reliability under ISO 7637-2 stress and compatibility with high-volume automated assembly.
FAQ
What is the polarity configuration of the P4SMA51C?
The P4SMA51C is a unidirectional TVS diode, with cathode marked by a band on the DO-214AC package. It conducts only when the cathode is at higher potential than the anode-making it suitable for protecting positive DC rails. This differs from bidirectional variants like P4SMA51CA, which clamp in both directions. Always verify orientation during PCB layout to avoid functional failure.
Does the P4SMA51C meet automotive transient immunity standards?
Yes, the P4SMA51C meets ISO 7637-2 requirements for Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling), validated per manufacturer test reports. Its 400W peak pulse power and 73.5V clamping voltage ensure robust protection for 12V and 24V automotive subsystems such as body control modules and lighting drivers.
What is the maximum allowable junction temperature for the P4SMA51C?
The P4SMA51C has a maximum junction temperature (TJ) rating of +150°C, with derating beginning above 25°C ambient per Figure 2 in the datasheet. At 85°C ambient, its peak pulse power drops to approximately 240W. Thermal design must account for PCB copper area, airflow, and adjacent heat sources to maintain TJ ≤150°C during repeated surge events.
How does the P4SMA51C compare to the P4SMA51A in clamping performance?
The P4SMA51C has a VC of 73.5V at 5.7A (10/1000μs), while the P4SMA51A clamps at 70.1V at 6.0A. Though the 'A' version offers slightly lower clamping voltage, the P4SMA51C provides broader VBR tolerance (45.9–56.1V vs. 48.5–53.6V), making it more tolerant of process variation in high-volume manufacturing. Both share identical package and power rating.
Is the P4SMA51C compliant with RoHS and halogen-free standards?
Yes, the P4SMA51C is RoHS compliant and halogen-free per IEC 61249-2-21. Its molding compound meets UL 94V-0 flammability rating, and matte tin-plated leads comply with J-STD-002 solderability requirements. These certifications support use in consumer, industrial, and automotive applications with strict environmental compliance mandates.
P4SMA51C 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:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 41.3V
- Voltage - Breakdown (Min):
- 45.9V
- Voltage - Clamping (Max) @ Ipp:
- 73.5V
- Current - Peak Pulse (10/1000µs):
- 5.7A
- 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)
P4SMA51C FAQ
1.How can I place an order for P4SMA51C through Aetrix?
Please submit a Request for Quotation (RFQ) for P4SMA51C 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 P4SMA51C reliable?
The price and inventory of P4SMA51C are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P4SMA51C is usually 5 days.
3.What payment methods are accepted for P4SMA51C?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMA51C transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4SMA51C?
P4SMA51C orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4SMA51C 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 P4SMA51C?
For technical support, including P4SMA51C datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMA51C requirements.
6.How does Aetrix verify that P4SMA51C is sourced from the original manufacturer or authorized distributors?
All P4SMA51C 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 P4SMA51C meets industry standards.
7.What is the process for return or replacement of P4SMA51C?
All P4SMA51C units undergo pre-shipment inspection (PSI). If there is an issue with P4SMA51C, 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 P4SMA51C part is unused and in its original packaging.
Return procedure for P4SMA51C:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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