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

STMicroelectronics STPS1150AY

Name: STPS1150AY
Brand: STMicroelectronics
SKU: STPS1150AY
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STPS1150AY

Manufacturer:: STMicroelectronics

Category:: Single Diodes

Package:: DO-214AC, SMA

Datasheet:: STPS1150AY.pdf

Description:: DIODE SCHOTTKY 150V 1A SMA

Quantity:: RFQ Add To RFQ list

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Inventory:16,311

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Product details

Overview

STPS1150AY from STMicroelectronics is an AEC-Q101-qualified 150 V automotive Schottky rectifier in SMA package, delivering 1 A average forward current, 0.67 V max forward voltage at 125 °C and 1 A, and 175 °C maximum junction temperature. It is designed for ECU power stages and flyback converters on ≤24 V rails where low conduction loss and thermal robustness are critical.

For engineers reviewing the STPS1150AY datasheet, STPS1150AY pinout, STPS1150AY application, or STPS1150AY equivalent, key selection factors include its 150 V reverse voltage rating, avalanche-rated 108 W peak power, 30 °C/W junction-to-lead thermal resistance, and ECOPACK®2 compliance for automotive-grade reliability and RoHS-conforming manufacturing.

Technical Context

This Schottky diode uses a planar silicon structure optimized for low VF and negligible switching losses-enabling high-frequency operation without reverse recovery charge. Its 150 V VRRM supports 24 V system rail derating while maintaining margin against transients in engine control environments.

The device features specified avalanche capability (108 W at 10 µs), validated under Tj = 125 °C conditions, and achieves low thermal resistance via direct lead-frame mounting in the SMA package-critical for sustained 1 A conduction in constrained ECU PCB layouts.

Key Specifications

Parameter	Value and Actual Design Meaning
VRRM	150 V - Withstands repetitive reverse transients up to 150 V, suitable for 24 V automotive systems with ISO 7637-2 pulse protection margins.
IF(AV)	1 A at TL = 150 °C - Sustains continuous DC output current in compact ECU power supplies without forced cooling.
VF(max)	0.67 V at Tj = 125 °C, IF = 1 A - Minimizes conduction loss (P ≈ 0.67 W) and improves efficiency over silicon PN alternatives.
Tj(max)	175 °C - Enables operation in under-hood environments where ambient temperatures exceed 125 °C.
Rth(j-l)	30 °C/W - Enables direct thermal path to PCB copper pour or heatsink via leads, reducing thermal design complexity.
IFSM	50 A (10 ms sine) - Handles cold-crank and load-dump surge events without failure in automotive power inputs.
ECOPACK®2	RoHS-compliant, halogen-free epoxy - Meets automotive environmental standards and supports lead-free reflow assembly.

Pinout & Package

STPS1150AY is housed in an SMA (DO-214AC) surface-mount package with cathode band marking. The package features two terminals: anode and cathode, mounted on a copper lead frame for low Rth(j-l).

Pin/Terminal	Circuit Role	Design Meaning
Anode	Input current entry point	Connected to input rail (e.g., battery or converter secondary); must withstand 150 V reverse bias when cathode is higher potential.
Cathode	Output current exit point	Connected to output node (e.g., post-rectification filter); marked by band on package body per JEDEC DO-214AC standard.

Key Features

Feature	Design Value
AEC-Q101 qualification	Validated for automotive under-hood use including temperature cycling, humidity, and mechanical shock per stress test requirements.
Negligible switching losses	No reverse recovery charge (Qrr = 0), eliminating switching loss and EMI in >100 kHz flyback and buck-derived topologies.
Low VF at high Tj	0.67 V max at 125 °C/1 A enables stable efficiency across full operating temperature range without derating.
Avalanche capability	108 W peak avalanche power (tp = 10 µs) provides robustness against inductive turn-off transients in relay or solenoid drive circuits.
SMA package thermal performance	30 °C/W junction-to-lead resistance allows ≥1 A DC operation on 1 cm² 35 µm copper without external heatsink.

Applications

Engine Control Unit (ECU) Power Supply

Flyback Converter Output Rectification

Use Scenario: Rectifying switched output of isolated flyback transformer in 12 V/24 V automotive ECU main power supply.

IC Role / Device Role / Timing Role: Output rectifier diode handling continuous 1 A DC load with transient surges during cold-crank.

Use Value: Low VF reduces conduction loss by ~35% vs. comparable 150 V Si PN diodes, extending thermal margin in sealed ECU enclosures.

Use Scenario: Secondary-side rectification in high-frequency (≥200 kHz) flyback converters for ADAS camera modules.

IC Role / Device Role / Timing Role: High-efficiency synchronous rectification alternative-operates without gate drive due to zero Qrr.

Use Value: Eliminates reverse recovery-related ringing and EMI, simplifying EMI filter design and enabling smaller magnetics.

Automotive Body Control Module (BCM)

Start-Stop System Auxiliary Power

Use Scenario: Input rectification for 5 V/3.3 V auxiliary rails powered from vehicle battery via buck pre-regulator.

IC Role / Device Role / Timing Role: Reverse polarity and surge protection diode in front-end protection stage.

Use Value: Avalanche rating absorbs load-dump energy (ISO 16750-2) without clamping circuitry, reducing BOM count.

Use Scenario: Output rectifier in bidirectional DC-DC converter supplying 12 V auxiliary loads during engine stop phase.

IC Role / Device Role / Timing Role: Bidirectional conduction-capable rectifier supporting regenerative braking energy return paths.

Use Value: Stable VF across -40 °C to +175 °C ensures predictable efficiency during repeated start-stop cycles in hot under-hood conditions.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
Vishay VS-1N5819TR-M3/54	40 V VRRM, 1 A IF(AV), 0.475 V VF typ @ 25 °C - lower voltage rating, higher VF at elevated Tj.	Not rated for automotive AEC-Q101; limited to 125 °C Tj max - unsuitable for under-hood ECU use.	Select only for non-automotive 5–12 V low-power supplies where thermal margin exceeds 50 °C.
ON Semiconductor SB1150-T	150 V VRRM, 1 A IF(AV), 0.82 V VF max @ 25 °C, 0.75 V @ 125 °C - higher VF than STPS1150AY by 80 mV at 125 °C.	AEC-Q101 qualified but lacks published avalanche rating - less robust against inductive transients in ECU motor drivers.	Acceptable for cost-sensitive automotive applications where surge immunity is managed externally, but STPS1150AY preferred for integrated transient resilience.

Compared with VS-1N5819TR-M3/54 and SB1150-T, STPS1150AY delivers superior high-temperature VF stability, certified avalanche ruggedness, and full AEC-Q101 compliance-making it the optimal choice for thermally constrained, safety-critical automotive power rectification.

Availability

STPS1150AY is available at Aetrix Electronics and suitable for Engine Control Units, ADAS camera power supplies, Body Control Modules, and Start-Stop auxiliary converters requiring stable component supply across automotive production lifecycles.

Supply support for STPS1150AY 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, specializing in automotive, industrial, and power management solutions with vertical manufacturing capabilities.

The STPS series targets automotive-grade Schottky rectifiers engineered for high-reliability power conversion in harsh environments-emphasizing low VF, thermal resilience, and transient robustness for ECU, BCM, and ADAS subsystems.

FAQ

Is STPS1150AY suitable for synchronous rectification replacement?

No-it is a passive Schottky diode and cannot replace active synchronous rectifiers (e.g., MOSFETs with gate drivers). However, its zero Qrr and low VF make it ideal where synchronous control is impractical, such as in isolated flyback secondaries with no auxiliary winding for gate drive.

What is the maximum PCB copper area needed for 1 A continuous operation?

With 35 µm copper thickness, ≥1.4 cm² of exposed copper under each lead (per Figure 8) achieves Rth(j-a) ≈ 50 °C/W, enabling 1 A continuous conduction at Tamb = 85 °C. No external heatsink is required if this layout is implemented.

Does STPS1150AY require derating above 125 °C junction temperature?

Yes-its IF(AV) rating is specified at TL = 150 °C, but VF increases only modestly (to 0.67 V max at 125 °C). Derating is primarily thermal: ensure Rth(j-a) × Ploss + Tamb ≤ 175 °C. Conduction loss remains predictable up to Tj = 175 °C.

Can STPS1150AY be used in non-automotive industrial power supplies?

Yes-its 150 V rating, 175 °C Tj, and avalanche capability suit industrial SMPS, PoE injectors, and 24 V PLC power rails. While AEC-Q101 qualification is automotive-specific, the underlying reliability and thermal performance provide strong value in demanding industrial environments.

STPS1150AY Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: Q

Package/Case:: DO-214AC, SMA

Packaging:: Tape & Reel (TR)

Product Status:: Active

Technology:: Schottky

Voltage - DC Reverse (Vr) (Max):: 150 V

Current - Average Rectified (Io):: 1A

Voltage - Forward (Vf) (Max) @ If:: 820 mV @ 1 A

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

Reverse Recovery Time (trr):: -

Current - Reverse Leakage @ Vr:: 1 µA @ 150 V

Capacitance @ Vr, F:: -

Grade:: Automotive

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SMA

Operating Temperature - Junction:: 175°C (Max)

STPS1150AY FAQ

1.How can I place an order for STPS1150AY through Aetrix?

Please submit a Request for Quotation (RFQ) for STPS1150AY 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 STPS1150AY reliable?

The price and inventory of STPS1150AY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STPS1150AY is usually 5 days.

3.What payment methods are accepted for STPS1150AY?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STPS1150AY transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STPS1150AY?

STPS1150AY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STPS1150AY 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 STPS1150AY?

For technical support, including STPS1150AY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STPS1150AY requirements.

6.How does Aetrix verify that STPS1150AY is sourced from the original manufacturer or authorized distributors?

All STPS1150AY 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 STPS1150AY meets industry standards.

7.What is the process for return or replacement of STPS1150AY?

All STPS1150AY units undergo pre-shipment inspection (PSI). If there is an issue with STPS1150AY, 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 STPS1150AY part is unused and in its original packaging.

Return procedure for STPS1150AY:

1.Submit a request within 90 days.

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

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