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Home > Products > Circuit Protection > Transient Voltage Suppressors (TVS) > TVS Diodes

Taiwan Semiconductor Corporation P4SMA39AH

Name: P4SMA39AH
Brand: Taiwan Semiconductor Corporation
SKU: P4SMA39AH
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: P4SMA39AH

Manufacturer:: Taiwan Semiconductor Corporation

Category:: TVS Diodes

Package:: DO-214AC, SMA

Datasheet:: P4SMA39AH.pdf

Description:: TVS DIODE 33.3VWM 53.9VC DO214AC

Quantity:: RFQ Add To RFQ list

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Product details

Overview

P4SMA39AH 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 33.3 V working stand-off voltage, 37.1–41.0 V breakdown voltage at 1 mA, 53.9 V clamping voltage at 7.7 A (10/1000 µs), 400 W peak pulse power rating, and AEC-Q101 qualification for automotive-grade reliability.

For engineers reviewing the P4SMA39AH datasheet, P4SMA39AH pinout, P4SMA39AH application, or P4SMA39AH equivalent, key selection criteria include clamping performance under ISO 7637-2 Pulse 1/2a/2b/3a/3b transients, low leakage (<1 µA at V_WM), DO-214AC (SMA) package compatibility with automated SMT assembly, and junction temperature range of –55 °C to +150 °C.

Technical Context

The P4SMA39AH operates as a unidirectional avalanche diode, leveraging glass-passivated silicon junction technology to achieve fast response (<1.0 ps) and stable clamping during ESD and surge events. Its single-die DO-214AC configuration supports bidirectional variants only when marked with CH/CAH suffixes - this part is strictly unidirectional, with cathode band polarity marking.

It complies with JESD201 Class 2 whisker resistance, J-STD-020 Moisture Sensitivity Level 1, and UL 94V-0 mold compound flammability. Electrical behavior follows ANSI/IEEE C62.35 standards, with derating applied above 25 °C ambient per Fig.2 and non-repetitive surge capability defined by the 10/1000 µs waveform.

Key Specifications

Parameter	Value and Actual Design Meaning
V_WM	33.3 V - Maximum continuous reverse operating voltage before significant leakage begins; defines safe DC bias margin.
V_BR @ I_T=1 mA	37.1–41.0 V - Breakdown voltage range at test current; ensures predictable turn-on during transients.
V_C @ I_PPM=7.7 A	53.9 V - Clamping voltage under 400 W 10/1000 µs surge; limits downstream IC stress during worst-case transients.
I_R @ V_WM	<1 µA - Reverse leakage at stand-off voltage; minimizes standby power loss in battery-powered systems.
P_PPM	400 W - Peak pulse power handling per single non-repetitive event; meets ISO 7637-2 Pulse 3b requirements.
T_J Range	–55 °C to +150 °C - Operating junction temperature window; supports under-hood automotive and industrial environments.
Package	DO-214AC (SMA) - Standardized surface-mount outline with matte tin-plated leads; compatible with IPC-7351B footprint.

Pinout & Package

DO-214AC (SMA) package: molded epoxy case with cathode band marking; dual axial leads, 0.060 g typical weight; RoHS-compliant, halogen-free, UL 94V-0 rated.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward conduction terminal	Connected to lower-potential side (e.g., GND or return path); conducts during forward surge or fault conditions.
Cathode	Reverse-biased clamping terminal	Connected to protected line (e.g., 33 V rail); avalanches into conduction when reverse voltage exceeds V_BR.

Key Features

Feature	Design Value
AEC-Q101 qualified	Validated for automotive electronics per stress-test requirements including HTOL, TC, UHAST, and ESD-HBM/MM.
Glass passivated junction	Enhances long-term stability and moisture resistance vs. epoxy-passivated alternatives; critical for high-reliability deployments.
Fast response time	<1.0 ps - Enables suppression of nanosecond-scale ESD events before sensitive ICs experience damage.
ISO 7637-2 compliance	Withstands Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling) waveforms.
Moisture sensitivity level 1	No floor-life limitation or bake requirement prior to reflow; simplifies SMT line logistics and reduces handling overhead.

Applications

Switching Mode Power Supply (SMPS)	On-board DC/DC Converter
Use Scenario: Input stage protection against load dump and back-EMF spikes in 24 V/36 V automotive SMPS units. IC Role / Device Role / Timing Role: Unidirectional TVS placed across input capacitor to clamp transients before they reach PWM controller and MOSFET gate drivers. Use Value: Limits peak voltage to ≤53.9 V during 400 W surges, preventing controller latch-up and MOSFET avalanche failure.	Use Scenario: Output rail protection in isolated 5 V/12 V point-of-load converters powering ADAS sensors or infotainment ECUs. IC Role / Device Role / Timing Role: Secondary-side TVS connected between regulated output and ground to absorb coupled noise and ESD from connected modules. Use Value: Sub-1 µA leakage preserves light-load efficiency; 150 °C max junction temperature enables operation near hot power stages.
Lighting Application	Adapters
Use Scenario: Overvoltage protection in LED driver circuits subjected to lightning-induced surges on AC mains or 24 V bus inputs. IC Role / Device Role / Timing Role: Primary-side TVS mounted directly at connector entry point to shunt energy before rectifier and bulk capacitor. Use Value: 400 W rating handles repetitive 10/1000 µs surges common in outdoor lighting; DO-214AC allows compact board layout.	Use Scenario: Input-stage transient suppression in universal-input wall adapters (90–264 VAC) feeding USB-C PD or legacy 5 V/12 V outputs. IC Role / Device Role / Timing Role: Bridge rectifier output protection device absorbing differential-mode surges after AC/DC conversion. Use Value: 33.3 V V_WM aligns with 36 V nominal DC bus; clamping at 53.9 V prevents overvoltage on primary-side controller ICs.

Switching Mode Power Supply (SMPS)

On-board DC/DC Converter

Use Scenario: Input stage protection against load dump and back-EMF spikes in 24 V/36 V automotive SMPS units.

IC Role / Device Role / Timing Role: Unidirectional TVS placed across input capacitor to clamp transients before they reach PWM controller and MOSFET gate drivers.

Use Value: Limits peak voltage to ≤53.9 V during 400 W surges, preventing controller latch-up and MOSFET avalanche failure.

Use Scenario: Output rail protection in isolated 5 V/12 V point-of-load converters powering ADAS sensors or infotainment ECUs.

IC Role / Device Role / Timing Role: Secondary-side TVS connected between regulated output and ground to absorb coupled noise and ESD from connected modules.

Use Value: Sub-1 µA leakage preserves light-load efficiency; 150 °C max junction temperature enables operation near hot power stages.

Lighting Application

Adapters

Use Scenario: Overvoltage protection in LED driver circuits subjected to lightning-induced surges on AC mains or 24 V bus inputs.

IC Role / Device Role / Timing Role: Primary-side TVS mounted directly at connector entry point to shunt energy before rectifier and bulk capacitor.

Use Value: 400 W rating handles repetitive 10/1000 µs surges common in outdoor lighting; DO-214AC allows compact board layout.

Use Scenario: Input-stage transient suppression in universal-input wall adapters (90–264 VAC) feeding USB-C PD or legacy 5 V/12 V outputs.

IC Role / Device Role / Timing Role: Bridge rectifier output protection device absorbing differential-mode surges after AC/DC conversion.

Use Value: 33.3 V V_WM aligns with 36 V nominal DC bus; clamping at 53.9 V prevents overvoltage on primary-side controller ICs.

Equivalent & Alternatives

The following parts are listed as comparable options for similar transient voltage suppression applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SMBJ36A	DO-214AA (SMB) package; 36 V V_WM, 58.1 V V_C @ 6.9 A; same 400 W rating but higher clamping voltage.	Higher thermal mass but larger footprint; less suitable for ultra-compact layouts constrained by DO-214AC spacing.	Select SMBJ36A only if board space permits larger SMB package and system can tolerate ~4.2 V higher clamping.
1.5SMC39A	DO-214AB (SMC) package; 39 V V_WM, 60.0 V V_C @ 6.7 A; 1500 W rating but significantly larger size and higher leakage (≤5 µA).	Designed for higher-energy surges; over-specified for 400 W use cases and incompatible with fine-pitch SMA footprints.	Choose 1.5SMC39A only when legacy designs require SMC compatibility or surge energy exceeds 400 W.

Compared with SMBJ36A and 1.5SMC39A, the P4SMA39AH delivers optimal balance of clamping performance, compact DO-214AC footprint, and automotive-grade reliability - making it preferred for space-constrained, AEC-Q101–required 33 V rail protection where precise V_WM margin and low leakage are critical.

Availability

P4SMA39AH is available at Aetrix Electronics and suitable for switching mode power supplies, on-board DC/DC converters, and lighting applications requiring stable component supply, automotive qualification, and consistent surge immunity performance.

Supply support for P4SMA39AH 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 automotive, industrial, and consumer markets.

The P4SMA series targets high-reliability transient suppression in harsh environments, with design emphasis on AEC-Q101 compliance, low clamping voltage, and robust packaging for automated SMT assembly.

FAQ

What is the polarity configuration of the P4SMA39AH?

The P4SMA39AH is a unidirectional TVS diode with clearly marked cathode band indicating the clamping terminal. It conducts in reverse bias above V_BR and blocks up to 33.3 V in forward direction. Bidirectional variants use CH or CAH suffixes - P4SMA39AH is not bidirectional.

Does the P4SMA39AH meet automotive qualification standards?

Yes, the P4SMA39AH is AEC-Q101 qualified and tested per automotive stress requirements including high-temperature operating life, temperature cycling, and ESD-HBM. It also meets ISO 7637-2 Pulse 1/2a/2b/3a/3b for vehicle electrical system transients.

What is the maximum clamping voltage of the P4SMA39AH under surge conditions?

The P4SMA39AH has a maximum clamping voltage (V_C) of 53.9 V at 7.7 A peak pulse current using the 10/1000 µs waveform. This value is guaranteed across temperature and ensures downstream circuitry remains within safe operating limits during standardized surge events.

Can the P4SMA39AH be used in bidirectional protection circuits?

No - the P4SMA39AH is unidirectional only. For bidirectional protection, select parts with CH or CAH suffixes (e.g., P4SMA39CAH), which feature symmetrical breakdown in both directions and no polarity marking. Using P4SMA39AH in bidirectional configurations risks improper clamping or failure.

What is the moisture sensitivity level (MSL) and reflow profile guidance for the P4SMA39AH?

The P4SMA39AH is rated MSL Level 1 per J-STD-020, meaning it has unlimited floor life and requires no baking prior to reflow soldering. It supports standard lead-free reflow profiles with peak temperatures up to 260 °C, and its matte tin-plated leads comply with J-STD-002 solderability requirements.

P4SMA39AH 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):: 33.3V

Voltage - Breakdown (Min):: 37.1V

Voltage - Clamping (Max) @ Ipp:: 53.9V

Current - Peak Pulse (10/1000µs):: 7.7A

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)

P4SMA39AH FAQ

1.How can I place an order for P4SMA39AH through Aetrix?

Please submit a Request for Quotation (RFQ) for P4SMA39AH 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 P4SMA39AH reliable?

The price and inventory of P4SMA39AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P4SMA39AH is usually 5 days.

3.What payment methods are accepted for P4SMA39AH?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMA39AH transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for P4SMA39AH?

P4SMA39AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your P4SMA39AH 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 P4SMA39AH?

For technical support, including P4SMA39AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMA39AH requirements.

6.How does Aetrix verify that P4SMA39AH is sourced from the original manufacturer or authorized distributors?

All P4SMA39AH 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 P4SMA39AH meets industry standards.

7.What is the process for return or replacement of P4SMA39AH?

All P4SMA39AH units undergo pre-shipment inspection (PSI). If there is an issue with P4SMA39AH, 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 P4SMA39AH part is unused and in its original packaging.

Return procedure for P4SMA39AH:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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