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Taiwan Semiconductor Corporation P6SMB51A
- Part No.:
- P6SMB51A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
P6SMB51A.pdf
- Description:
- TVS DIODE 43.6VWM 70.1VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:8,237
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Product details
Overview
P6SMB51A from Taiwan Semiconductor is a unidirectional 600W surface-mount transient voltage suppressor (TVS) diode with a breakdown voltage range of 48.5–53.6 V, stand-off voltage of 43.6 V, and clamping voltage of 70.1 V at 8.9 A peak pulse current. It features low leakage (<1 µA at 43.6 V), fast response (<1.0 ps), and meets ISO 7637-2 Pulse 1/2a/2b/3a/3b for automotive surge immunity. It is used in DC power rail protection for switching mode power supplies.
For engineers reviewing the P6SMB51A datasheet, P6SMB51A pinout, P6SMB51A application, or P6SMB51A equivalent, this page delivers verified electrical specs, DO-214AA package details, clamping performance under 10/1000 µs transients, thermal resistance data (RθJA = 55 °C/W), and direct alternatives for overvoltage protection in industrial and automotive power systems.
Technical Context
The P6SMB51A operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its minimum breakdown voltage (48.5 V) at 1 mA test current. Its glass-passivated junction ensures stable VBR tolerance (±5%) and low temperature coefficient (0.102 %/°C).
Designed for 10/1000 µs surge waveforms, it delivers 600 W non-repetitive peak pulse power with clamping voltage limited to 70.1 V at 8.9 A - enabling robust protection of 48 V nominal rails without overstressing downstream ICs like DC-DC controllers or microcontrollers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 48.5 V / 53.6 V - defines reliable turn-on threshold across temperature and unit variation |
| VWM | 43.6 V - maximum continuous reverse operating voltage before leakage rises significantly |
| VC @ IPPM | 70.1 V at 8.9 A - clamped voltage during 10/1000 µs surge; limits stress on protected circuitry |
| PPPSM | 600 W - peak pulse power handling per single transient event (non-repetitive) |
| IR @ VWM | <1 µA - ensures negligible standby power loss and signal integrity in high-impedance circuits |
| RθJA | 55 °C/W - thermal resistance from junction to ambient; informs derating above 25 °C ambient |
| Package | DO-214AA (SMB) - industry-standard surface-mount outline with 0.090 g mass and J-STD-002 solderability |
Pinout & Package
Package: DO-214AA (SMB), molded plastic case with matte tin-plated leads, polarity indicated by cathode band. Complies with UL 94V-0 flammability and JESD201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., GND or return path) in unidirectional configuration |
| Cathode | Reverse-biased surge clamping terminal | Connected to protected line (e.g., +48 V rail); conducts only during overvoltage events |
Key Features
| Feature | Design Value |
|---|---|
| Clamping ratio (VC/VBR) | 1.31 - low ratio ensures tight voltage limiting relative to breakdown, reducing margin risk |
| Response time | <1.0 ps - enables suppression before sensitive logic or analog circuitry responds to transients |
| Moisture sensitivity | Level 1 per J-STD-020 - allows unlimited floor life and standard SMT reflow without baking |
| Automated placement compatibility | Low-profile SMB package with defined tape-and-reel packaging (3,000 pcs/reel) - supports high-speed pick-and-place |
| Environmental compliance | RoHS-compliant and halogen-free per IEC 61249-2-21 - meets global regulatory requirements for PCB assembly |
Applications
| Switching Mode Power Supply (SMPS) | Industrial DC Power Adapter |
|---|---|
Use Scenario: Protection of primary-side rectifier output and secondary-side 48 V distribution bus against load dump and inductive switching spikes. IC Role / Device Role: Unidirectional TVS placed across DC output rail to clamp surges before reaching DC-DC converters or PMICs. Use Value: Limits transient voltage to ≤70.1 V, preventing latch-up or gate oxide damage in downstream 75 V-rated MOSFETs and controllers. | Use Scenario: Input-stage surge suppression in DIN-rail mounted 48 V adapters exposed to long cable runs and field wiring noise. IC Role / Device Role: First-line defense against ISO 7637-2 Pulse 1 (inductive load disconnect) and Pulse 2b (supply line transient). Use Value: Withstands 600 W peak pulses while maintaining <1 µA leakage at 43.6 V, preserving no-load efficiency and system reliability. |
| Telecom Equipment Power Rails | Automotive Body Control Module (BCM) |
Use Scenario: Overvoltage protection on 48 V auxiliary power rails feeding FPGA I/O banks and Ethernet PHYs in base station equipment. IC Role / Device Role: Standoff-rated TVS ensuring signal integrity during hot-swap events and ESD coupling into power domains. Use Value: 43.6 V VWM provides 10% margin above nominal 48 V rail (derated), avoiding false triggering during normal operation. | Use Scenario: Protection of LIN bus power supply and microcontroller VDD inputs against battery line transients during jump-start or alternator load dump. IC Role / Device Role: Unidirectional clamping device on 12 V–48 V distributed power networks within BCM subassemblies. Use Value: Meets ISO 7637-2 Pulse 2a/2b/3a/3b requirements with validated clamping performance up to 70.1 V at full rated current. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ51A (Bourns) | Same DO-214AA package, identical VBR (48.5–53.6 V), VC = 70.1 V, but rated for 600 W per JEDEC standards; slightly higher RθJA (60 °C/W) | Identical use cases; validated in same automotive EMC test suites | Select SMBJ51A if Bourns qualification documentation or legacy design reuse is required |
| 1.5SMC51A (ON Semiconductor) | Same electrical specs and DO-214AB (SMA) package - physically larger (7.11 × 6.22 mm vs. SMB's 4.57 × 3.94 mm), higher RθJA (65 °C/W) | Requires PCB layout change; suitable where board space permits and thermal margin is tighter | Choose 1.5SMC51A only if existing SMA footprint exists or higher surge repetition rate is needed (higher thermal mass) |
Compared with SMBJ51A and 1.5SMC51A, the P6SMB51A offers identical clamping performance in a smaller DO-214AA footprint and lower thermal resistance (55 °C/W), making it optimal for space-constrained 48 V power modules requiring high-density layout and efficient heat dissipation.
Availability
P6SMB51A is available at Aetrix Electronics and suitable for switching mode power supplies, industrial DC adapters, and telecom power rails requiring stable component supply, consistent surge rating, and RoHS-compliant manufacturing.
Supply support for P6SMB51A 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, including TVS diodes, rectifiers, and MOSFETs, with global distribution and AEC-Q200 qualified product lines.
The P6SMB51A belongs to TSC's P6SMBx(A) series of 600 W surface-mount TVS diodes, engineered specifically for automotive and industrial DC power line protection where compact size, low leakage, and ISO 7637-2 compliance are mandatory.
FAQ
What is the maximum clamping voltage of the P6SMB51A under a 10/1000 µs surge?
The P6SMB51A has a maximum clamping voltage (VC) of 70.1 V when subjected to its rated peak pulse current of 8.9 A under the standardized 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and guarantees predictable voltage limiting during real-world transients such as load dump or inductive kickback. The P6SMB51A maintains this clamping performance across its specified junction temperature range (−55 °C to +150 °C).
Is the P6SMB51A suitable for bidirectional surge protection?
No, the P6SMB51A is a unidirectional TVS diode intended for DC line protection with defined anode/cathode polarity. For bidirectional applications (e.g., AC lines or data bus protection), the P6SMB51CA variant must be used - it carries a "CA" suffix and provides symmetrical clamping in both directions. Using the P6SMB51A in reverse-biased AC configurations risks permanent failure due to forward conduction during negative half-cycles.
What is the standoff voltage (VWM) of the P6SMB51A, and why does it matter?
The P6SMB51A has a maximum working peak reverse voltage (VWM) of 43.6 V. This parameter defines the highest continuous DC or repetitive peak voltage the device can block without exceeding 1 µA leakage current. It ensures the P6SMB51A remains inactive during normal operation of a 48 V nominal system (with appropriate derating), preventing unnecessary power loss or false triggering while still responding rapidly to transients exceeding that threshold.
Does the P6SMB51A meet automotive surge immunity standards?
Yes, the P6SMB51A meets ISO 7637-2 Pulse 1 (inductive load disconnect), Pulse 2a (sudden load removal), Pulse 2b (supply line transient), and Pulses 3a/3b (capacitive coupled noise) requirements. Its 600 W peak pulse rating, fast response (<1.0 ps), and validated clamping behavior under 10/1000 µs waveforms make it suitable for protecting ECUs, body control modules, and infotainment power supplies in 12 V and 48 V automotive architectures.
What is the thermal resistance of the P6SMB51A, and how does it affect layout?
The P6SMB51A has a junction-to-ambient thermal resistance (RθJA) of 55 °C/W under standard JEDEC test conditions (single device on 1-inch² FR-4 board with 2 oz copper). This value informs PCB copper pour sizing and airflow requirements: for example, at 600 W peak power (transient, not steady-state), self-heating is negligible, but repeated surges require adequate copper area to avoid cumulative junction temperature rise. Layout should follow TSC's recommended pad dimensions for DO-214AA to ensure solder joint reliability and thermal conduction.
P6SMB51A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AA, SMB
- Series:
- P6SMB
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 43.6V
- Voltage - Breakdown (Min):
- 48.5V
- Voltage - Clamping (Max) @ Ipp:
- 70.1V
- Current - Peak Pulse (10/1000µs):
- 8.9A
- Power - Peak Pulse:
- 600W
- 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-214AA (SMB)
P6SMB51A FAQ
1.How can I place an order for P6SMB51A through Aetrix?
Please submit a Request for Quotation (RFQ) for P6SMB51A 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 P6SMB51A reliable?
The price and inventory of P6SMB51A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P6SMB51A is usually 5 days.
3.What payment methods are accepted for P6SMB51A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P6SMB51A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P6SMB51A?
P6SMB51A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P6SMB51A 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 P6SMB51A?
For technical support, including P6SMB51A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P6SMB51A requirements.
6.How does Aetrix verify that P6SMB51A is sourced from the original manufacturer or authorized distributors?
All P6SMB51A 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 P6SMB51A meets industry standards.
7.What is the process for return or replacement of P6SMB51A?
All P6SMB51A units undergo pre-shipment inspection (PSI). If there is an issue with P6SMB51A, 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 P6SMB51A part is unused and in its original packaging.
Return procedure for P6SMB51A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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