My Inquiry
My Account
Taiwan Semiconductor Corporation P4SMA51AH
- Part No.:
- P4SMA51AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
P4SMA51AH.pdf
- Description:
- TVS DIODE 43.6VWM 70.1VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:8,276
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
P4SMA51AH from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for overvoltage protection in DC power lines and signal paths. It features a 43.6 V working stand-off voltage, 48.5–53.6 V breakdown voltage at 1 mA, 70.1 V maximum clamping voltage at 6.0 A peak pulse current, and 400 W peak pulse power rating per 10/1000 µs waveform.
For engineers reviewing the P4SMA51AH datasheet, P4SMA51AH pinout, P4SMA51AH application, or P4SMA51AH equivalent, key selection criteria include clamping performance under ISO 7637-2 Pulse 1/2a/2b/3a/3b, AEC-Q101 qualification for automotive use, DO-214AC (SMA) package compatibility, and low leakage (<1 µA at VWM) for low-power systems.
Technical Context
The P4SMA51AH operates as a unidirectional avalanche diode with glass-passivated junction, enabling fast response (<1.0 ps) to transient surges while maintaining stable reverse leakage below 1 µA at 43.6 V. Its thermal design supports continuous operation from –55 °C to +150 °C junction temperature.
It complies with ISO 7637-2 for automotive transient immunity and meets JESD201 Class 2 whisker resistance and J-STD-020 Moisture Sensitivity Level 1-enabling reliable reflow soldering without preconditioning.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 43.6 V - Maximum continuous reverse operating voltage before significant leakage begins |
| VBR @ IT=1 mA | 48.5–53.6 V - Verified breakdown range ensuring robust turn-on margin above VWM |
| VC @ IPPM=6.0 A | 70.1 V - Clamped voltage during 10/1000 µs surge, limiting downstream stress |
| PPPM | 400 W - Peak pulse power handling capability per standard waveform |
| IR @ VWM | <1 µA - Ultra-low leakage preserves battery life and signal integrity in standby |
| TJ max | +150 °C - Enables placement near heat sources in power converters and motor drives |
Pinout & Package
Package: DO-214AC (SMA), surface-mount, single-diode configuration with cathode band marking. Matte tin-plated leads meet J-STD-002 solderability requirements.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to protected line's lower-potential side (e.g., GND or return path) |
| Cathode | Reverse-biased clamping terminal | Connected to protected line's higher-potential side (e.g., VIN, signal rail); marked by band |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics per stress test requirements including temperature cycling, HTRB, and ESD |
| Glass passivated junction | Enhances long-term reliability and moisture resistance versus epoxy-passivated alternatives |
| Fast response time <1.0 ps | Clamps transients before sensitive ICs experience overstress-critical for CAN, LIN, and sensor interfaces |
| Meets ISO 7637-2 Pulse 1/2a/2b/3a/3b | Guarantees immunity to common automotive load-dump and inductive-switching transients |
| RoHS & halogen-free | Complies with IEC 61249-2-21 and EU RoHS Directive for environmentally constrained applications |
Applications
| Automotive Body Control Module (BCM) | Industrial SMPS Input Protection |
|---|---|
Use Scenario: Protects microcontroller I/O and LIN bus lines from load dump and alternator ripple in door modules and lighting controllers. IC Role / Device Role / Timing Role: Unidirectional TVS placed between LIN line and ground to clamp negative transients and limit positive overshoot. Use Value: Prevents latch-up or damage to LIN transceivers during battery disconnection events, validated per ISO 7637-2 Pulse 2b. | Use Scenario: Shields primary-side controller ICs and MOSFET gates from switching spikes and input surges in 24 V industrial AC/DC adapters. IC Role / Device Role / Timing Role: Standoff-rated TVS on DC input rail upstream of bulk capacitor to absorb repetitive 400 W pulses without degradation. Use Value: Maintains VWM = 43.6 V margin above nominal 36 V max input, enabling robust operation across wide input ranges. |
| LED Driver Overvoltage Clamp | On-Board DC/DC Converter Input |
Use Scenario: Safeguards constant-current LED driver ICs against voltage reversals and inductive kickback in streetlight and signage systems. IC Role / Device Role / Timing Role: Unidirectional clamping device connected anode-to-ground, cathode-to-LED string supply rail. Use Value: Limits transient excursions to ≤70.1 V, preventing gate oxide rupture in integrated high-side switches rated for 60 V max. | Use Scenario: Installed at input of 48 V-to-12 V buck converter in railway or telecom equipment to suppress coupling from adjacent high-current traces. IC Role / Device Role / Timing Role: Primary surge suppression element on main DC input, coordinated with bulk capacitance to reduce dv/dt stress. Use Value: Delivers 6.0 A peak impulse current handling with <1 µA leakage-minimizing quiescent loss in always-on subsystems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ51A | DO-214AA (SMB) package; 51 V VBR min/max tighter (48.5–53.6 V same), but 600 W PPPM | Higher power rating suits larger energy transients; larger footprint may require PCB redesign | Select when surge energy exceeds 400 W and board space allows SMB outline |
| 1.5SMC51A | DO-214AB (SMC) package; identical VBR range and VC, but 1500 W PPPM and higher IPPM (29.1 A) | Designed for high-energy industrial transients; not AEC-Q101 qualified | Choose for non-automotive 48 V systems requiring >1 kV ESD or lightning-level immunity |
Compared with SMBJ51A and 1.5SMC51A, the P4SMA51AH offers optimal balance of AEC-Q101 compliance, DO-214AC footprint efficiency, and 400 W surge capacity-making it preferred for space-constrained automotive and industrial DC/DC inputs where qualification and reliability are mandatory.
Availability
P4SMA51AH is available at Aetrix Electronics and suitable for automotive body electronics, industrial switch-mode power supplies, and on-board DC/DC converters requiring stable component supply with full traceability and lifecycle management.
Supply support for P4SMA51AH 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 power devices since 1979.
The P4SMA series belongs to TSC's AEC-Q101-qualified surface-mount TVS portfolio, engineered specifically for automotive and industrial environments demanding high-reliability transient suppression with minimal leakage and precise clamping.
FAQ
What is the polarity configuration of the P4SMA51AH?
The P4SMA51AH is a unidirectional TVS diode, with cathode marked by a band on the DO-214AC (SMA) package body. It conducts only in forward bias and clamps reverse transients above its breakdown voltage-unlike bidirectional variants which suppress both polarities. This makes P4SMA51AH ideal for DC rail protection where polarity is fixed.
Does the P4SMA51AH meet automotive qualification standards?
Yes, the P4SMA51AH is AEC-Q101 qualified, having passed stress tests including high-temperature reverse bias (HTRB), temperature cycling, and electrostatic discharge per JESD22. It also meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b for automotive transient immunity-making it suitable for engine control units, body modules, and infotainment power rails.
What is the maximum clamping voltage of the P4SMA51AH under surge conditions?
The P4SMA51AH has a maximum clamping voltage (VC) of 70.1 V at 6.0 A peak pulse current (IPPM) using the 10/1000 µs waveform. This value is guaranteed across temperature and ensures downstream components see no more than 70.1 V during standardized surge events-critical for protecting 60 V-rated MOSFETs and controllers.
How does the P4SMA51AH compare to the P4SMA51H variant?
The P4SMA51AH has a tighter breakdown voltage range (48.5–53.6 V) versus P4SMA51H (45.9–56.1 V), resulting in more consistent clamping behavior and improved margin control in precision power rails. Both share identical package, power rating, and AEC-Q101 qualification-but P4SMA51AH is preferred where tighter VBR tolerance reduces design uncertainty.
Is the P4SMA51AH compatible with lead-free reflow soldering processes?
Yes, the P4SMA51AH uses matte tin-plated leads compliant with J-STD-002 and is rated for moisture sensitivity level 1 (MSL-1) per J-STD-020-meaning it can be stored indefinitely at ambient conditions and withstand standard lead-free reflow profiles (peak 260 °C) without baking or special handling.
P4SMA51AH 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):
- 43.6V
- Voltage - Breakdown (Min):
- 48.5V
- Voltage - Clamping (Max) @ Ipp:
- 70.1V
- Current - Peak Pulse (10/1000µs):
- 6A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
P4SMA51AH FAQ
1.How can I place an order for P4SMA51AH through Aetrix?
Please submit a Request for Quotation (RFQ) for P4SMA51AH 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 P4SMA51AH reliable?
The price and inventory of P4SMA51AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P4SMA51AH is usually 5 days.
3.What payment methods are accepted for P4SMA51AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMA51AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4SMA51AH?
P4SMA51AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4SMA51AH 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 P4SMA51AH?
For technical support, including P4SMA51AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMA51AH requirements.
6.How does Aetrix verify that P4SMA51AH is sourced from the original manufacturer or authorized distributors?
All P4SMA51AH 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 P4SMA51AH meets industry standards.
7.What is the process for return or replacement of P4SMA51AH?
All P4SMA51AH units undergo pre-shipment inspection (PSI). If there is an issue with P4SMA51AH, 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 P4SMA51AH part is unused and in its original packaging.
Return procedure for P4SMA51AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
P4SMA51AH Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
Tech Hub
Comparator circuit design covering voltage thresholds, input limits, open-collector outputs, LM393 wiring, op-amp differences, hysteresis, timing, window detection and practical fault diagnosis.
Schmitt triggers use separate rising and falling thresholds to stabilize slow or noisy signals. This guide covers hysteresis, 74HC14 and 74HCT14 selection, comparator calculations, RC oscillators and p…
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
