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

STMicroelectronics STPS1L40ZFY

Name: STPS1L40ZFY
Brand: STMicroelectronics
SKU: STPS1L40ZFY
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STPS1L40ZFY

Manufacturer:: STMicroelectronics

Category:: Single Diodes

Package:: SOD-123F

Datasheet:: STPS1L40ZFY.pdf

Description:: DIODE SCHOTTKY 40V 1A SOD123F

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Inventory:10,933

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Product details

Overview

STPS1L40ZFY from STMicroelectronics is an AEC-Q101-qualified automotive Schottky rectifier in SOD123Flat package, rated for 1 A average forward current and 40 V repetitive peak reverse voltage, with typical forward voltage drop of 0.37 V at 125 °C and junction temperature capability up to 175 °C, used for polarity protection and freewheeling in low-voltage automotive DC-DC converters.

For engineers reviewing the STPS1L40ZFY datasheet, STPS1L40ZFY pinout, STPS1L40ZFY application, or STPS1L40ZFY equivalent, key selection criteria include low conduction loss (VF = 0.37 V typ. @ 125 °C), avalanche-rated power (65 W @ 10 µs), thermal resistance (Rth(j-l) = 20 °C/W), surface-mount compatibility, and PPAP-capable qualification for automotive systems.

Technical Context

This Schottky rectifier operates as a unidirectional, low-loss power switching diode optimized for high-frequency operation in automotive power supplies. Its metal-semiconductor junction enables negligible switching losses and eliminates minority-carrier storage delay, making it suitable for synchronous rectification and fast-recovery freewheeling paths.

The device supports operation across -40 °C to +175 °C junction temperature range with specified avalanche capability (PARM = 65 W, tp = 10 µs) and thermal derating validated per SOD123Flat package layout. Reverse leakage remains below 10 mA at 125 °C and full VRRM, ensuring stable blocking under hot ambient conditions.

Key Specifications

Parameter	Value and Actual Design Meaning
IF(AV)	1 A - Maximum continuous forward current at TL = 160 °C, defining usable DC load capacity in compact automotive PCB layouts.
VRRM	40 V - Peak reverse voltage rating, enabling use in 12 V/24 V automotive systems with transient margin against load-dump spikes.
VF (typ.)	0.37 V @ Tj = 125 °C, IF = 1 A - Low conduction loss directly reduces power dissipation and thermal stress in space-constrained modules.
Tj (max.)	+175 °C - Maximum junction temperature, supporting operation in engine-bay environments without external heatsinking.
Rth(j-l)	20 °C/W - Junction-to-lead thermal resistance for SOD123Flat, enabling accurate thermal modeling using PCB copper area under leads.
IR (max.)	10 mA @ Tj = 125 °C, VR = 40 V - Controlled reverse leakage ensures minimal standby power loss in always-on vehicle subsystems.
PARM	65 W @ tp = 10 µs, Tj = 125 °C - Avalanche energy rating allows safe clamping of inductive switching transients in motor control circuits.

Pinout & Package

STPS1L40ZFY is housed in the SOD123Flat surface-mount package - a low-profile, leadless, thermally enhanced variant of SOD123 with exposed cathode pad for improved heat transfer. Dimensions: 2.60 × 1.60 × 0.85 mm (L × W × H), weight 12.5 mg.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward current entry point	Connected to input/power rail side; requires adequate copper pour for thermal management and current handling.
Cathode	Forward current exit / reverse blocking terminal	Exposed metal pad on bottom surface - must be soldered to large PCB copper area for thermal conduction and mechanical stability.

Key Features

Feature	Design Value
AEC-Q101 qualified	Validated for automotive-grade reliability including temperature cycling, humidity, and mechanical shock testing per JESD47.
Negligible switching losses	Zero reverse recovery time (tRR ≈ 0 ns) eliminates switching loss and EMI associated with PN diode tail current.
Low VF with thermal stability	VF increases only marginally with temperature (0.37 V @ 125 °C vs. 0.50 V @ 25 °C), maintaining efficiency across operating range.
PPAP capable	Manufacturing process and test flow meet AIAG PPAP Level 3 requirements for production part approval in Tier-1 supply chains.
Avalanche capability	Rated for 65 W single-pulse avalanche energy, enabling robustness against inductive kickback in motor driver and solenoid circuits.

Applications

Engine Control Unit (ECU) Power Rail Protection

Automotive Infotainment DC-DC Converter Output Rectification

Use Scenario: Polarity reversal protection on 12 V main input to ECU microcontroller power domain.

IC Role / Device Role / Timing Role: Unidirectional blocking diode preventing damage during battery jump-start misconnection.

Use Value: With VF = 0.37 V @ 125 °C, conduction loss stays below 370 mW at 1 A, minimizing thermal impact in sealed ECU enclosures.

Use Scenario: Secondary-side synchronous rectification in 5 V/3.3 V buck converter supplying SoC and display drivers.

IC Role / Device Role / Timing Role: High-frequency freewheeling diode replacing MOSFET gate drive complexity in cost-sensitive designs.

Use Value: Zero tRR eliminates switching node ringing and reduces output filter size versus standard silicon diodes.

Body Control Module (BCM) Load Dump Clamping

Electric Power Steering (EPS) Motor Freewheeling Diode

Use Scenario: Transient suppression on LIN bus or sensor supply lines subjected to ISO 7637-2 Pulse 5a load dump events.

IC Role / Device Role / Timing Role: Avalanche-energy-absorbing clamp diode placed upstream of LDO regulators.

Use Value: PARM = 65 W @ 10 µs provides defined energy-handling margin beyond typical 50–60 W requirement for Class D load dump.

Use Scenario: Freewheeling path for brushed DC motor current during PWM turn-off in EPS assist actuation circuit.

IC Role / Device Role / Timing Role: Fast-turn-off path preventing back-EMF voltage overshoot across H-bridge switches.

Use Value: Rth(j-l) = 20 °C/W enables direct thermal coupling to PCB ground plane, sustaining 1 A RMS current without heatsink.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STPS1L40AY	SMA package (Rth(j-l) = 30 °C/W); higher thermal resistance and larger footprint than SOD123Flat.	Better suited for through-hole-compatible or higher-power derating scenarios where board space permits.	Select when thermal interface to heatsink or chassis is available; avoid if PCB real estate or profile height is constrained.
STPS1L40UY	SMB package (Rth(j-l) = 25 °C/W); intermediate thermal performance and 30% larger footprint than SOD123Flat.	Preferred for mixed-technology boards requiring standardized SMB footprints and moderate power density.	Choose when legacy SMB placement or higher surge current (IFSM = 60 A vs. 50 A) is prioritized over minimal height.

Compared with STPS1L40AY and STPS1L40UY, STPS1L40ZFY offers the lowest profile and best thermal resistance per unit area due to its SOD123Flat construction, making it optimal for ultra-thin automotive modules where Z-height and localized thermal management are critical.

Availability

STPS1L40ZFY is available at Aetrix Electronics and suitable for automotive infotainment systems, body control modules, and electric power steering units requiring stable component supply with AEC-Q101 compliance and PPAP documentation support.

Supply support for STPS1L40ZFY 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 microcontrollers, power devices, sensors, and analog ICs for automotive, industrial, and consumer markets.

STPS1L40ZFY belongs to ST's automotive-qualified Schottky rectifier product line, engineered specifically for high-efficiency, high-reliability power conversion in space- and thermally-constrained vehicle subsystems.

FAQ

Is STPS1L40ZFY suitable for 48 V mild-hybrid automotive systems?

No - STPS1L40ZFY has a 40 V VRRM rating, which does not provide sufficient margin for 48 V nominal systems subject to ISO 16750-2 load dump transients (up to 65 V). It is designed for 12 V/24 V architectures only. For 48 V applications, ST recommends STPS2L60 or similar 60 V-rated Schottky rectifiers.

What is the recommended PCB pad layout for optimal thermal performance of STPS1L40ZFY?

The SOD123Flat package requires a minimum 1.40 × 1.60 mm exposed cathode pad (per Figure 20), connected to ≥2 cm² internal or external copper plane via ≥4 thermal vias (0.3 mm diameter, filled or plated). ST specifies Rth(j-a) reduction from 120 °C/W (no copper) to ~45 °C/W with 2 cm² copper area on FR4.

Does STPS1L40ZFY require derating when mounted on a double-sided PCB without internal planes?

Yes - with no internal copper planes, Rth(j-a) rises to ~120 °C/W. At 1 A IF(AV), power dissipation is ~0.37 W (using VF = 0.37 V), resulting in ΔTj-a ≈ 44 °C. Ambient must stay ≤131 °C to maintain Tj ≤175 °C; thus, full 1 A rating is only valid with ≥1 cm² external copper on both sides and ≥2 thermal vias per pad.

Can STPS1L40ZFY replace a standard PN rectifier like 1N4007 in automotive applications?

No - while STPS1L40ZFY offers lower VF and faster switching, its 40 V VRRM is significantly lower than 1N4007's 1000 V rating. It is not a general-purpose replacement. Use only in low-voltage, high-frequency applications where reverse voltage never exceeds 40 V and zero reverse recovery is beneficial.

STPS1L40ZFY 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:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: SOD-123F

Operating Temperature - Junction:: -40°C ~ 150°C

STPS1L40ZFY FAQ

1.How can I place an order for STPS1L40ZFY through Aetrix?

Please submit a Request for Quotation (RFQ) for STPS1L40ZFY 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 STPS1L40ZFY reliable?

The price and inventory of STPS1L40ZFY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STPS1L40ZFY is usually 5 days.

3.What payment methods are accepted for STPS1L40ZFY?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STPS1L40ZFY transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STPS1L40ZFY?

STPS1L40ZFY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STPS1L40ZFY 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 STPS1L40ZFY?

For technical support, including STPS1L40ZFY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STPS1L40ZFY requirements.

6.How does Aetrix verify that STPS1L40ZFY is sourced from the original manufacturer or authorized distributors?

All STPS1L40ZFY 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 STPS1L40ZFY meets industry standards.

7.What is the process for return or replacement of STPS1L40ZFY?

All STPS1L40ZFY units undergo pre-shipment inspection (PSI). If there is an issue with STPS1L40ZFY, 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 STPS1L40ZFY part is unused and in its original packaging.

Return procedure for STPS1L40ZFY:

1.Submit a request within 90 days.

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

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