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Home > Products > Discrete Semiconductor Products > Diodes > Rectifiers > Single Diodes

STMicroelectronics STPS1L40ZF

Name: STPS1L40ZF
Brand: STMicroelectronics
SKU: STPS1L40ZF
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STPS1L40ZF

Manufacturer:: STMicroelectronics

Category:: Single Diodes

Package:: SOD-123F

Datasheet:: STPS1L40ZF.pdf

Description:: DIODE SCHOTTKY 40V 1A SOD123F

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Inventory:20,899

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Product details

Overview

STPS1L40ZF from STMicroelectronics is a 40 V, 1 A low-drop Schottky rectifier in SOD123Flat package, designed for high-frequency DC-DC converters and reverse polarity protection circuits. It delivers typ. 0.37 V forward voltage at 1 A/125 °C, supports 175 °C max junction temperature, and features avalanche rating (65 W, 10 µs) for robust transient handling in TV and set-top box power supplies.

For engineers reviewing the STPS1L40ZF datasheet, STPS1L40ZF pinout, STPS1L40ZF application, or STPS1L40ZF equivalent, key selection criteria include its ultra-low VF at high temperature, SOD123Flat thermal performance (Rth(j-l) = 20 °C/W), ECOPACK2 compliance, and suitability for space-constrained, low-voltage (<12 V) freewheeling and battery charger input stages.

Technical Context

This single-die Schottky rectifier uses platinum-silicide barrier technology to achieve low conduction losses and negligible switching losses-critical for >100 kHz SMPS topologies. Its low reverse leakage (<10 mA @ 125 °C, VR = 40 V) and junction capacitance (~100 pF @ 1 V) minimize dynamic losses in synchronous rectification and flyback snubber networks.

The device operates across -65 °C to +175 °C junction range and is rated for repetitive avalanche energy (65 W, 10 µs pulse), enabling reliable operation under inductive load switching and line surge conditions without external clamping in compact consumer power designs.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	40 V - Maximum reverse blocking voltage; defines safe operating margin in 24 V or 36 V input rails with transient headroom.
I_F(AV)	1 A - Continuous average forward current at T_L = 160 °C on SOD123Flat; enables compact PCB layout without heatsink in <5 W output converters.
V_F(typ.)	0.37 V @ 1 A, 125 °C - Low conduction loss reduces power dissipation to ~370 mW, critical for thermal management in sealed enclosures.
R_th(j-l)	20 °C/W - Junction-to-lead thermal resistance for SOD123Flat; allows direct copper pour thermal coupling to PCB ground plane for passive cooling.
I_FSM	50 A @ 10 ms - Non-repetitive surge rating; withstands inrush currents in battery charger input stages and hot-plug events.
T_j(max)	+175 °C - High junction temperature rating permits operation in thermally dense consumer power modules without derating.
ECOPACK2	Compliant - Halogen-free, RoHS-compliant packaging meeting strict environmental requirements for global consumer electronics markets.

Pinout & Package

SOD123Flat surface-mount package: 2-terminal, cathode-banded, ultra-compact footprint (2.6 × 1.6 mm), optimized for automated placement and high-density PCB layouts. Lead-free, UL94 V0 epoxy body.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward current entry point	Connected to input rail or switch node; low series resistance minimizes voltage drop during conduction phase.
Cathode (banded end)	Forward current exit / reverse blocking terminal	Connected to output or ground return; band orientation ensures correct polarity placement during assembly and prevents reverse bias failure.

Key Features

Feature	Design Value
Low forward voltage drop	0.37 V typ. @ 1 A, 125 °C - Reduces conduction loss by >30% vs. standard Schottkys, improving efficiency in 5–12 V DC-DC outputs.
Avalanche-rated	65 W repetitive peak power @ 10 µs, T_j = 125 °C - Eliminates need for external TVS in low-energy inductive switching paths (e.g., buck converter freewheeling).
SOD123Flat thermal performance	R_th(j-l) = 20 °C/W - Enables >0.8 W power dissipation with ≤16 °C rise over ambient using minimal 2 cm² copper pour per lead.
High-temperature operation	T_j(max) = +175 °C - Supports sustained operation in enclosed TV power supplies where ambient exceeds 85 °C.
ECOPACK2 compliance	Halogen-free, RoHS-compliant materials - Meets IEC 61249-2-21 and JEDEC J-STD-020 reflow profiles without compromising reliability.

Applications

Reverse Polarity Protection

TV Power Supply Input Stage

Use Scenario: Prevents damage when 12 V DC input is accidentally reversed in wall-powered consumer displays.

IC Role / Device Role / Timing Role: Low-loss series blocking diode placed between connector and primary DC-DC stage.

Use Value: 0.37 V VF at full load limits insertion loss to <3.1%, preserving system efficiency while enabling compact SOD123Flat layout.

Use Scenario: Freewheeling path in 24 V → 5 V/3 A buck converter powering main SoC and audio subsystems.

IC Role / Device Role / Timing Role: Synchronous rectifier replacement in secondary-side recovery loop.

Use Value: Negligible reverse recovery time eliminates switching loss spikes, reducing EMI and improving light-load regulation stability.

Set-Top Box Standby Converter

USB-C Battery Charger Input Clamp

Use Scenario: Output rectification in 5 V/0.5 A flyback supplying standby MCU and remote IR receiver.

IC Role / Device Role / Timing Role: Primary output rectifier operating continuously at <100 mA average current.

Use Value: <10 µA reverse leakage at 25 °C ensures <5 µW standby power drain, meeting EU ErP Tier 2 requirements.

Use Scenario: Input polarity guard before USB-C PD controller and buck-boost IC in portable charger design.

IC Role / Device Role / Timing Role: Reverse-blocking element protecting downstream silicon from miswired adapters.

Use Value: Avalanche rating absorbs 50 A inrush surges during hot-plug events without degradation, extending product lifetime.

Equivalent & Alternatives

The following parts are listed as comparable options for similar Schottky rectifier applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SS14 (DO-214AC/SMA)	VF = 0.5 V @ 1 A, 25 °C; R_th(j-l) = 30 °C/W; no avalanche rating	Higher conduction loss (+35% at 125 °C); requires larger thermal pad; unsuitable for surge-prone inputs	Lower-cost option only for non-critical, low-temp, low-surge applications with ample board area.
RB520S-40T2R (SOD-523)	VF = 0.35 V @ 100 mA; I_F(AV) = 200 mA; R_th(j-l) = 220 °C/W	Not rated for 1 A continuous; thermal limit restricts use to <100 mW dissipation; no avalanche spec	Only viable for signal-level or micro-power bias rails-not for power conversion or protection roles.

Compared with SS14 and RB520S-40T2R, STPS1L40ZF uniquely combines 1 A continuous rating, 0.37 V VF at elevated temperature, 20 °C/W thermal resistance in SOD123Flat, and certified avalanche capability-making it the sole choice for thermally constrained, high-reliability 40 V Schottky applications.

Availability

STPS1L40ZF is available at Aetrix Electronics and suitable for TV power supply input stages, set-top box standby converters, and USB-C battery charger polarity protection requiring stable component supply and long-term industrial availability.

Supply support for STPS1L40ZF 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing analog, power, MCU, and sensor solutions for automotive, industrial, and consumer markets.

STPS1L40ZF belongs to ST's high-efficiency Schottky rectifier product line, engineered specifically for low-VF, high-temperature operation in compact AC-DC and DC-DC power supplies targeting consumer electronics and home entertainment systems.

FAQ

What is the maximum allowable PCB copper area for optimal thermal performance of STPS1L40ZF?

For SOD123Flat, ST recommends ≥2.0 cm² of 35 µm copper per lead (total ≥4.0 cm²) to achieve R_th(j-a) ≈ 65 °C/W. With this layout, 1 A continuous operation yields ≤13 °C junction-to-ambient rise at 25 °C ambient-verified in Figure 14 of DS1244 Rev 9.

Does STPS1L40ZF require a heatsink in typical 1 A applications?

No heatsink is required. At 1 A and 25 °C ambient, junction temperature remains <95 °C with 2 cm² copper per lead (R_th(j-a) ≈ 65 °C/W). Even at 85 °C ambient, T_j stays below 175 °C-confirmed by thermal curves in Figures 4 and 14 of the datasheet.

Is STPS1L40ZF compatible with lead-free reflow profiles?

Yes. STPS1L40ZF is qualified for JEDEC J-STD-020D Level 1 moisture sensitivity and supports peak reflow temperatures up to 260 °C (per DS1244 Section 2.4). Its ECOPACK2-compliant epoxy meets IPC/JEDEC standards without delamination or voiding.

How does the avalanche rating of STPS1L40ZF compare to standard Schottky diodes?

STPS1L40ZF is explicitly rated for 65 W repetitive avalanche power at 10 µs pulses and 125 °C junction temperature-a feature absent in most Schottkys. This allows safe absorption of inductive kickback in buck/flyback freewheeling without external clamps, unlike non-avalanche parts such as SS14 or 1N5819.

STPS1L40ZF Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: SOD-123F

Packaging:: Tape & Reel (TR)

Product Status:: Active

Technology:: Schottky

Voltage - DC Reverse (Vr) (Max):: 40 V

Current - Average Rectified (Io):: 1A

Voltage - Forward (Vf) (Max) @ If:: 500 mV @ 1 A

Speed:: Fast Recovery =< 500ns, > 200mA (Io)

Reverse Recovery Time (trr):: -

Current - Reverse Leakage @ Vr:: 35 µA @ 40 V

Capacitance @ Vr, F:: -

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOD-123F

Operating Temperature - Junction:: -40°C ~ 175°C

STPS1L40ZF FAQ

1.How can I place an order for STPS1L40ZF through Aetrix?

Please submit a Request for Quotation (RFQ) for STPS1L40ZF 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 STPS1L40ZF reliable?

The price and inventory of STPS1L40ZF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STPS1L40ZF is usually 5 days.

3.What payment methods are accepted for STPS1L40ZF?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STPS1L40ZF transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STPS1L40ZF?

STPS1L40ZF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STPS1L40ZF 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 STPS1L40ZF?

For technical support, including STPS1L40ZF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STPS1L40ZF requirements.

6.How does Aetrix verify that STPS1L40ZF is sourced from the original manufacturer or authorized distributors?

All STPS1L40ZF 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 STPS1L40ZF meets industry standards.

7.What is the process for return or replacement of STPS1L40ZF?

All STPS1L40ZF units undergo pre-shipment inspection (PSI). If there is an issue with STPS1L40ZF, 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 STPS1L40ZF part is unused and in its original packaging.

Return procedure for STPS1L40ZF:

1.Submit a request within 90 days.

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

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