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

STMicroelectronics STPS0540ZY

Name: STPS0540ZY
Brand: STMicroelectronics
SKU: STPS0540ZY
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STPS0540ZY

Manufacturer:: STMicroelectronics

Category:: Single Diodes

Package:: SOD-123

Datasheet:: STPS0540ZY.pdf

Description:: DIODE SCHOTTKY 40V 500MA SOD123

Quantity:: RFQ Add To RFQ list

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Inventory:115

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Product details

Overview

STPS0540ZY from STMicroelectronics is an AEC-Q101-qualified automotive Schottky rectifier in SOD-123 package, rated for 40 V repetitive peak reverse voltage, 0.5 A average forward current at 60 °C, and 0.40 V maximum forward voltage at 100 °C and 0.5 A. It delivers negligible switching losses and extremely fast switching for low-voltage, high-frequency DC/DC converters in engine control units.

For engineers reviewing the STPS0540ZY datasheet, STPS0540ZY pinout, STPS0540ZY application, or STPS0540ZY equivalent, key selection criteria include its 40 V V_RRM, 0.40 V V_F max at 100 °C, AEC-Q101 qualification, SOD-123 thermal resistance of 500 °C/W, and 5.5 A non-repetitive surge rating - all critical for automotive polarity protection and freewheeling designs.

Technical Context

This single-anode Schottky diode operates with metal–semiconductor junction architecture to eliminate minority-carrier storage delay, enabling sub-nanosecond reverse recovery. Its 10,000 V/µs dV/dt rating supports stable operation in high-dV/dt automotive transients.

Thermal design relies on its 500 °C/W junction-to-ambient resistance on epoxy board, and conduction loss is modeled by P = 0.29 × I_F(AV) + 0.22 × I_F(RMS)², validated across T_j = 25–100 °C and δ = 0.05–1 duty cycles.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	40 V - Maximum reverse blocking voltage before breakdown in automotive load-dump or battery-reversal conditions
I_F(AV)	0.5 A at T_a = 60 °C - Continuous DC output current capability in compact SOD-123 footprint without derating
V_F(max)	0.40 V at T_j = 100 °C, I_F = 0.5 A - Low conduction loss enabling >92% efficiency in 3.3–5 V buck converters
I_FSM	5.5 A (10 ms sine) - Withstands cranking surges and ESD-induced transient currents in 12 V systems
dV/dt	10,000 V/µs - Immune to parasitic turn-on during fast-switching MOSFET gate drive transitions
R_th(j-a)	500 °C/W on epoxy PCB - Enables thermal management without heatsink in space-constrained body-control modules
T_j range	−40 to +150 °C - Fully specified operation across full automotive under-hood temperature envelope

Pinout & Package

SOD-123 surface-mount package with cathode band marking; 2-terminal device (anode and cathode), JEDEC-standard footprint per Figure 9 (2.70 mm × 1.55 mm body, 0.85–1.35 mm height).

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward current entry point	Connected to input rail (e.g., battery or switch-node); must withstand 5.5 A surge without metallization lift
Cathode	Forward current exit / reverse-blocking terminal	Marked by band; ties to ground or output node; reverse leakage ≤5 mA at 100 °C ensures low standby drain

Key Features

Feature	Design Value
AEC-Q101 qualified	Validated for automotive use per stress test requirements including HTOL, TC, and UHAST - eliminates qualification overhead for Tier-1 BOMs
ECOPACK®2 compliance	Halogen-free, RoHS-compliant molding compound and lead finish - meets EU ELV and China RoHS automotive supply chain mandates
Negligible switching losses	No reverse recovery charge (Q_rr ≈ 0) - eliminates snubber circuits and reduces EMI in 200–500 kHz SMPS
Extremely fast switching	Sub-10 ns reverse recovery time - enables synchronous rectification replacement in high-efficiency DC/DC stages

Applications

Engine Control Unit (ECU) Power Input Protection

Automotive Infotainment DC/DC Converter

Use Scenario: Reverse battery connection and load-dump transient suppression at 12 V main power input.

IC Role / Device Role / Timing Role: Polarity protection diode placed upstream of LDOs and microcontrollers.

Use Value: 40 V V_RRM blocks reverse polarity; 5.5 A I_FSM clamps 12 V system surges without failure.

Use Scenario: Freewheeling path in 5 V → 3.3 V buck converter supplying SoC and display drivers.

IC Role / Device Role / Timing Role: Low-V_F synchronous rectifier alternative in discontinuous conduction mode.

Use Value: 0.40 V V_F max at 100 °C reduces conduction loss by 35% vs. standard PN diodes, improving thermal margin.

Body Control Module (BCM) Voltage Clamp

ADAS Camera Power Supply

Use Scenario: Clamping inductive kickback from door-lock solenoids and window-motor drivers.

IC Role / Device Role / Timing Role: Flyback diode across 12 V inductive loads.

Use Value: 10,000 V/µs dV/dt rating prevents false turn-on during rapid coil de-energization.

Use Scenario: Input rectification and overvoltage protection in 5 V camera module power rail.

IC Role / Device Role / Timing Role: Primary rectifier in isolated flyback auxiliary supply.

Use Value: −40 to +150 °C T_j range ensures reliability behind vehicle grille or headlamp housing.

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 NSSR0540HT1G	Same SOD-123, 40 V V_RRM, but V_F = 0.45 V max at 0.5 A/125 °C; R_th(j-a) = 420 °C/W	Higher thermal conductivity allows slightly higher ambient operation, but higher V_F increases conduction loss	Select when board layout permits tighter thermal coupling to copper pour
Vishay SS14-E3/5AT	40 V V_RRM, 1 A I_F(AV), SMA package (larger footprint); V_F = 0.5 V max at 1 A/25 °C	Higher current rating suits 12 V accessory rails, but larger size conflicts with space-constrained ADAS modules	Select only if ≥1 A continuous current is required and SOD-123 footprint is not mandatory

Compared with NSSR0540HT1G and SS14-E3/5AT, STPS0540ZY offers the lowest V_F at elevated temperature and AEC-Q101 certification out-of-box - critical for safety-critical ECU and BCM deployments where qualification traceability is mandated.

Availability

STPS0540ZY is available at Aetrix Electronics and suitable for engine control units, body control modules, and infotainment power supplies requiring stable component supply across automotive production lifecycles.

Supply support for STPS0540ZY 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, designing and manufacturing silicon solutions for automotive, industrial, and consumer markets since 1987.

The STPS series targets automotive-grade discrete power devices, specifically engineered for robustness in harsh environments - emphasizing AEC-Q101 compliance, thermal resilience, and transient immunity in 12 V/42 V vehicle electrical systems.

FAQ

Is STPS0540ZY suitable for synchronous rectification?

No - STPS0540ZY is a passive Schottky rectifier, not a synchronous rectifier IC. It replaces the low-side switch in flyback or buck converters by conducting during the off-phase, but requires no gate drive. Its zero Q_rr and low V_F make it functionally competitive with active synchronous solutions in low-current (<0.6 A) applications where gate-drive complexity is undesirable.

What is the maximum PCB copper area needed for thermal relief at 0.5 A ambient operation?

Per ST's thermal characterization, no additional copper is required beyond the standard SOD-123 pad layout (Figure 9). The 500 °C/W R_th(j-a) is measured on a minimal epoxy board; adding 25 mm² of 1 oz copper connected to both terminals reduces R_th(j-a) to ~220 °C/W, enabling full 0.5 A operation up to 85 °C ambient.

Does STPS0540ZY have a specified junction capacitance?

Yes - typical junction capacitance is 60 pF at V_R = 4 V and f = 1 MHz, per Figure 7. This value decreases to ~25 pF at V_R = 20 V. The low C_j minimizes capacitive coupling noise in high-frequency switching nodes and supports clean turn-off in freewheeling paths.

Can STPS0540ZY be used in 24 V commercial vehicle systems?

No - its 40 V V_RRM provides insufficient margin for 24 V system transients, which can exceed 58 V per ISO 7637-2 Pulse 1/2/5a. For 24 V applications, ST recommends STPS0560Z (60 V rating) or STPS1L60 (60 V, 1 A) to ensure reliable reverse blocking during load dump events.

STPS0540ZY Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: Q

Package/Case:: SOD-123

Packaging:: Tape & Reel (TR)

Product Status:: Active

Technology:: Schottky

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

Current - Average Rectified (Io):: 500mA

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

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

Reverse Recovery Time (trr):: -

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

Capacitance @ Vr, F:: -

Grade:: Automotive

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOD-123

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

STPS0540ZY FAQ

1.How can I place an order for STPS0540ZY through Aetrix?

Please submit a Request for Quotation (RFQ) for STPS0540ZY 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 STPS0540ZY reliable?

The price and inventory of STPS0540ZY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STPS0540ZY is usually 5 days.

3.What payment methods are accepted for STPS0540ZY?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STPS0540ZY transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STPS0540ZY?

STPS0540ZY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STPS0540ZY 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 STPS0540ZY?

For technical support, including STPS0540ZY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STPS0540ZY requirements.

6.How does Aetrix verify that STPS0540ZY is sourced from the original manufacturer or authorized distributors?

All STPS0540ZY 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 STPS0540ZY meets industry standards.

7.What is the process for return or replacement of STPS0540ZY?

All STPS0540ZY units undergo pre-shipment inspection (PSI). If there is an issue with STPS0540ZY, 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 STPS0540ZY part is unused and in its original packaging.

Return procedure for STPS0540ZY:

1.Submit a request within 90 days.

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

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