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

STMicroelectronics STPS1L40UY

Name: STPS1L40UY
Brand: STMicroelectronics
SKU: STPS1L40UY
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STPS1L40UY

Manufacturer:: STMicroelectronics

Category:: Single Diodes

Package:: DO-214AA, SMB

Datasheet:: STPS1L40UY.pdf

Description:: DIODE SCHOTTKY 40V 1A SMB

Quantity:: RFQ Add To RFQ list

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Inventory:3,917

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Product details

Overview

STPS1L40UY from STMicroelectronics is an AEC-Q101-qualified automotive Schottky rectifier in SMB 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 up to 175 °C - deployed in low-voltage, high-frequency DC/DC converters and polarity protection circuits in engine control units.

For engineers reviewing the STPS1L40UY datasheet, STPS1L40UY pinout, STPS1L40UY application, or STPS1L40UY equivalent, key selection criteria include its low conduction loss (0.37 V VF typ. @ 125 °C), avalanche-rated 65 W pulse power, PPAP capability, SMD-compatible SMB footprint, and thermal resistance of 25 °C/W (junction-to-lead).

Technical Context

This single-die Schottky barrier rectifier operates without minority-carrier storage, delivering negligible switching losses and stable performance across -40 °C to +175 °C ambient. Its low VF and high surge current rating (60 A IFSM) support efficient freewheeling in synchronous buck topologies.

The device features specified avalanche capability under 10 µs pulses at 125 °C junction temperature and meets automotive-grade reliability per AEC-Q101 - validated for use in under-hood applications where thermal cycling and transient robustness are critical.

Key Specifications

Parameter	Value and Actual Design Meaning
IF(AV)	1 A average forward current - supports continuous 12 V automotive rail conversion at full load without forced cooling.
VRRM	40 V repetitive peak reverse voltage - compatible with 24 V nominal systems including start-stop and load-dump transients.
VF (typ.)	0.37 V at IF = 1 A, Tj = 125 °C - reduces conduction loss by ~30% vs. standard silicon diodes in same package.
Tj (max.)	+175 °C maximum junction temperature - enables operation in high-ambient under-hood environments without derating.
Rth(j-l)	25 °C/W junction-to-lead thermal resistance - allows direct PCB copper pad heat sinking for SMB package without external heatsink.
IFSM	60 A non-repetitive surge current (tp = 10 ms sinusoidal) - withstands motor startup and battery connection transients.
PARM	65 W repetitive peak avalanche power (tp = 10 µs, Tj = 125 °C) - provides controlled energy absorption during inductive turn-off events.

Pinout & Package

STPS1L40UY is housed in an SMB (DO-214AA) surface-mount package with two terminals: anode and cathode. The package measures 3.30–3.95 mm × 5.10–5.60 mm × 1.90–2.45 mm (L × W × H), optimized for automated placement and reflow soldering on FR4 PCBs with 35 µm copper.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward current entry point	Connected to input side of DC/DC stage; must be routed with low-inductance trace to minimize voltage overshoot during switching.
Cathode	Forward current exit point / output reference	Typically tied to ground or return path; serves as polarity protection node in reverse-battery protection circuits.

Key Features

Feature	Design Value
AEC-Q101 qualification	Validated for automotive use including temperature cycling, humidity, and mechanical shock per JESD47.
Low VF at high Tj	0.37 V typ. @ 125 °C ensures stable efficiency in hot under-hood locations without thermal runaway risk.
Avalanche energy rating	65 W PARM enables reliable clamping of inductive kickback in solenoid drivers and motor controllers.
PPAP capability	Full production documentation and process control available for Tier-1 automotive supply chain compliance.
SMB package thermal performance	25 °C/W Rth(j-l) permits >1 A continuous operation on 1 cm² 35 µm copper pad without thermal derating.

Applications

Engine Control Unit (ECU) Power Stage

Start-Stop System DC/DC Converter

Use Scenario: Regulating 12 V battery input to stable 5 V/3.3 V rails for microcontrollers and sensors in engine bay.

IC Role / Device Role / Timing Role: Freewheeling diode in synchronous buck converter operating at 200–500 kHz.

Use Value: Low VF minimizes power loss during high-duty-cycle operation; 175 °C Tj rating avoids thermal shutdown during prolonged idling.

Use Scenario: Voltage translation between 12 V starter battery and 48 V mild-hybrid auxiliary bus.

IC Role / Device Role / Timing Role: Output rectifier in isolated flyback or forward converter handling bidirectional energy flow.

Use Value: 60 A IFSM withstands cranking surges; avalanche rating absorbs leakage inductance spikes during MOSFET turn-off.

Automotive Lighting Driver

Reverse Battery Protection Module

Use Scenario: Driving LED headlamps with PWM dimming and overvoltage suppression.

IC Role / Device Role / Timing Role: Clamp diode across inductive LED driver switch to suppress flyback voltage.

Use Value: Fast recovery and low VF reduce heat generation in compact lamp housings; SMB footprint fits tight board space.

Use Scenario: Preventing damage from accidental reverse battery connection in infotainment and ADAS modules.

IC Role / Device Role / Timing Role: Series-connected Schottky rectifier blocking reverse current path.

Use Value: 40 V VRRM covers ISO 7637-2 pulse 5a (load dump); low VF limits insertion loss below 0.4 V at full system current.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
ON Semiconductor NSS1C200MT1G	Same SMB package, 200 V VRRM, 1 A IF(AV), VF = 0.52 V @ 1 A, Tj max = 150 °C	Higher voltage rating suits 48 V systems but higher VF increases conduction loss in 12 V designs	Select only if 40 V VRRM is insufficient; avoid for 12 V ECU use due to 40% higher VF and lower Tj limit.
Vishay VS-1EJH04-M3/5AT	SMB package, 40 V VRRM, 1 A IF(AV), VF = 0.45 V @ 1 A, Tj max = 175 °C, no AEC-Q101 certification	Lacks automotive qualification and PPAP support; avalanche rating not specified	Acceptable for industrial or consumer DC/DC where AEC-Q101 and PPAP are not required.

Compared with NSS1C200MT1G and VS-1EJH04-M3/5AT, STPS1L40UY uniquely combines AEC-Q101 qualification, 0.37 V VF at 125 °C, and 65 W avalanche power - making it the only choice for thermally constrained, safety-critical automotive power stages requiring production traceability.

Availability

STPS1L40UY is available at Aetrix Electronics and suitable for engine control units, start-stop DC/DC converters, and automotive lighting drivers requiring stable component supply across multi-year vehicle production cycles.

Supply support for STPS1L40UY 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, MCU, power, and sensor solutions for automotive, industrial, and consumer markets.

STPS1L40UY belongs to ST's automotive-qualified Schottky rectifier product line, engineered specifically for high-efficiency, high-reliability power conversion in harsh-temperature automotive environments.

FAQ

What is the maximum allowable PCB copper area for optimal thermal performance of STPS1L40UY?

Per Figure 14 in the datasheet, thermal resistance junction-to-ambient drops to ~45 °C/W with 1 cm² of 35 µm copper per lead on FR4. For continuous 1 A operation, ST recommends ≥2 cm² total copper area (1 cm² per lead) to maintain Tj ≤ 125 °C at 85 °C ambient - verified via thermal simulation using the provided Rth(j-a) vs. SCu curve.

Does STPS1L40UY require a heatsink in automotive under-hood applications?

No external heatsink is required. With Rth(j-l) = 25 °C/W and typical PCB copper pad thermal resistance of ~20 °C/W, total Rth(j-a) remains below 50 °C/W - enabling 1 A continuous operation at 105 °C ambient without derating. This is confirmed by Figure 2 and Table 2's TL = 155 °C limit for SMB package.

How does the 65 W avalanche power rating translate to real-world circuit protection?

The 65 W PARM rating applies to 10 µs pulses at Tj = 125 °C and corresponds to ~650 mJ single-pulse energy. In practice, this allows safe clamping of 40 V × 15 A × 10 µs inductive spikes - sufficient for solenoid drivers and relay coils in transmission control modules without external TVS devices.

Is STPS1L40UY compatible with lead-free reflow profiles per JEDEC J-STD-020?

Yes. ST specifies peak reflow temperature of 260 °C for 30 seconds maximum, matching IPC/JEDEC J-STD-020D Level 3 requirements. The SMB package uses matte tin plating and halogen-free epoxy compliant with RoHS and ELV directives - confirmed in Section 2 of the datasheet and ECOPACK® documentation.

STPS1L40UY Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: Q

Package/Case:: DO-214AA, SMB

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:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SMB

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

STPS1L40UY FAQ

1.How can I place an order for STPS1L40UY through Aetrix?

Please submit a Request for Quotation (RFQ) for STPS1L40UY 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 STPS1L40UY reliable?

The price and inventory of STPS1L40UY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STPS1L40UY is usually 5 days.

3.What payment methods are accepted for STPS1L40UY?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STPS1L40UY transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STPS1L40UY?

STPS1L40UY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STPS1L40UY 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 STPS1L40UY?

For technical support, including STPS1L40UY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STPS1L40UY requirements.

6.How does Aetrix verify that STPS1L40UY is sourced from the original manufacturer or authorized distributors?

All STPS1L40UY 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 STPS1L40UY meets industry standards.

7.What is the process for return or replacement of STPS1L40UY?

All STPS1L40UY units undergo pre-shipment inspection (PSI). If there is an issue with STPS1L40UY, 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 STPS1L40UY part is unused and in its original packaging.

Return procedure for STPS1L40UY:

1.Submit a request within 90 days.

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

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