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STMicroelectronics STPS1L40AY
- Part No.:
- STPS1L40AY
- Manufacturer:
- STMicroelectronics
- Category:
- Single Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
STPS1L40AY.pdf
- Description:
- DIODE SCHOTTKY 40V 1A SMA
- Quantity:
- Payment:
- Shipping:
Inventory:13,343
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Product details
Overview
STPS1L40AY from STMicroelectronics is an AEC-Q101-qualified automotive Schottky rectifier in SMA 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 maximum junction temperature of 175 °C. It delivers low conduction losses and negligible switching losses in low-voltage, high-frequency DC/DC converters and polarity protection circuits.
For engineers reviewing the STPS1L40AY datasheet, STPS1L40AY pinout, STPS1L40AY application, or STPS1L40AY equivalent, key selection criteria include its 0.37 V VF (typ.) at 125 °C, 60 A non-repetitive surge rating, avalanche capability (65 W, 10 µs), thermal resistance of 30 °C/W (junction-to-lead), and PPAP readiness for automotive production systems.
Technical Context
This single-die Schottky rectifier operates as a unidirectional power switch in surface-mount automotive power stages. Its low VF enables high efficiency in 12 V–24 V battery-fed systems, while specified avalanche energy handling supports transient robustness during load dump or inductive flyback events.
The device is thermally optimized for conduction cooling via lead attachment, with Rth(j-l) = 30 °C/W in SMA package and derated IF(AV) up to 1 A at TL = 155 °C. Its negligible reverse recovery charge eliminates switching loss concerns in >100 kHz topologies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| IF(AV) | 1 A - Sustained DC output current capability in automotive ambient conditions with proper PCB copper area |
| VRRM | 40 V - Withstands 12 V system transients including ISO 7637-2 Pulse 5a (load dump up to 35 V) with margin |
| VF (typ.) | 0.37 V at IF = 1 A, Tj = 125 °C - Enables <0.4 W conduction loss at full load, critical for thermally constrained modules |
| IFSM | 60 A (tp = 10 ms, sinusoidal) - Handles short-circuit fault currents without bond wire fusing |
| PARM | 65 W (tp = 10 µs, Tj = 125 °C) - Supports controlled avalanche clamping during inductive turn-off events |
| Tj (max.) | 175 °C - Enables operation in under-hood environments with minimal derating |
| Rth(j-l) | 30 °C/W - Defines thermal path from die to PCB pad; requires ≥2.63 mm × 5.43 mm copper footprint per lead |
Pinout & Package
STPS1L40AY is housed in SMA (DO-214AC) surface-mount package with two terminals: cathode (K) and anode (A). The package uses epoxy molding compound compliant with UL94 V0 and is designed for conduction-based cooling through soldered leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (A) | Input current entry point | Connected to input rail (e.g., battery+, converter primary side); must withstand surge and reverse-bias stress |
| Cathode (K) | Output current exit point | Connected to load or switching node; serves as reference for voltage sensing and thermal monitoring |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive temperature cycling, humidity, mechanical shock, and lifetime reliability per JESD47 |
| Negligible switching losses | No reverse recovery charge (Qrr ≈ 0), eliminating turn-off loss and EMI in high-frequency SMPS |
| Low VF at high Tj | 0.37 V typ. at 125 °C ensures stable efficiency across engine bay thermal range |
| Avalanche capability | 65 W pulse rating enables safe clamping of inductive spikes without external TVS |
| PPAP capable | Full production documentation, process control plans, and test reports available for Tier-1 automotive sourcing |
Applications
| Automotive Body Control Module (BCM) | 12 V DC/DC Converter Output Rectification |
|---|---|
Use Scenario: Polarity reversal protection on 12 V supply inputs to microcontroller-based lighting and door module PCBs. IC Role / Device Role / Timing Role: Unidirectional blocking diode preventing damage from incorrect battery connection. Use Value: Eliminates need for fuse + relay backup; maintains <0.5 V drop at 1 A, preserving brown-out margins. |
Use Scenario: Secondary-side rectification in synchronous buck-derived 12 V → 5 V/3.3 V converters powering infotainment SoCs. IC Role / Device Role / Timing Role: High-efficiency freewheeling path replacing MOSFET sync rectifier where gate drive complexity is prohibitive. Use Value: Achieves >92% efficiency at 500 kHz switching with no gate timing constraints or shoot-through risk. |
| Engine Control Unit (ECU) Power Input Stage | Start-Stop System Battery Interface |
Use Scenario: Reverse polarity and load dump protection on main 12 V input to engine management MCU and driver ICs. IC Role / Device Role / Timing Role: Primary clamp and conduction element absorbing ISO 7637-2 Pulse 5a transients. Use Value: Avalanche-rated 65 W pulse handling avoids external TVS, reducing BOM count and board space by 30%. |
Use Scenario: Isolation and voltage conditioning between starter battery and auxiliary AGM battery in micro-hybrid architectures. IC Role / Device Role / Timing Role: Low-loss bidirectional blocking element enabling controlled charge/discharge sequencing. Use Value: 0.37 V VF at 125 °C minimizes self-heating during repeated cranking cycles, extending diode lifetime beyond 10 years. |
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 SMA package, but VF = 0.45 V (typ.) at 1 A/125 °C; lower IFSM = 40 A | Limited to non-critical 12 V loads without load dump exposure | Preferred when cost sensitivity outweighs thermal margin requirements |
| Vishay VS-1EWH04-M3/5AT | SMB package (larger footprint), VF = 0.42 V (typ.), higher Rth(j-l) = 25 °C/W | Better surge handling (IFSM = 75 A) but requires larger PCB area and more copper | Chosen when higher fault current tolerance justifies layout impact |
Compared with STPS1L40AY, NSS1C200MT1G trades 0.08 V higher VF for lower unit cost, while VS-1EWH04-M3/5AT offers superior surge robustness in SMB form factor-neither matches ST's combination of 0.37 V VF, 60 A IFSM, and PPAP-ready AEC-Q101 compliance in SMA.
Availability
STPS1L40AY is available at Aetrix Electronics and suitable for automotive body control modules, 12 V DC/DC converters, engine control units, and start-stop system battery interfaces requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for STPS1L40AY 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, digital, and mixed-signal ICs for automotive, industrial, and consumer markets.
STPS1L40AY belongs to ST's automotive-qualified Schottky rectifier portfolio, engineered specifically for high-reliability, low-VF power conversion in under-hood and battery-connected systems.
FAQ
Is STPS1L40AY suitable for synchronous rectification replacement?
No-STPS1L40AY is a passive Schottky rectifier, not a synchronous rectifier IC. It replaces MOSFET-based synchronous rectifiers only in topologies where gate drive complexity, timing skew, or cost outweighs the ~2–3% efficiency gain of active switching. Its zero Qrr and 0.37 V VF make it ideal for fixed-frequency, medium-power DC/DC where simplicity and robustness are prioritized over peak efficiency.
What is the minimum recommended PCB copper area for thermal performance?
Per ST's recommended footprint (2.63 mm × 5.43 mm per lead), each SMA pad must be connected to ≥250 mm² of 35 µm copper on outer layer, with internal thermal vias to inner ground planes. This achieves the specified Rth(j-l) = 30 °C/W and sustains 1 A IF(AV) at TL = 155 °C. Reducing copper below 150 mm² increases junction temperature by >25 °C at full load.
Does STPS1L40AY require derating above 125 °C ambient?
Yes-IF(AV) must be linearly derated above 125 °C ambient using the curve in Figure 2 of the datasheet. At 150 °C ambient, maximum IF(AV) drops to 0.65 A for SMA package. Derating is governed by junction temperature limit (175 °C) and thermal resistance to ambient, which depends on actual PCB layout-not just junction-to-lead spec.
Can STPS1L40AY be used in non-automotive industrial applications?
Yes-its 175 °C Tj(max), AEC-Q101 qualification, and avalanche rating make it suitable for industrial motor drives, PoE injectors, and telecom power supplies where high reliability and transient immunity are required. However, non-automotive users should verify PPAP documentation is not contractually mandated, as ST provides full automotive-grade traceability and test data regardless of end use.
STPS1L40AY 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):
- 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:
- DO-214AC (SMA)
- Operating Temperature - Junction:
- -40°C ~ 150°C
STPS1L40AY FAQ
1.How can I place an order for STPS1L40AY through Aetrix?
Please submit a Request for Quotation (RFQ) for STPS1L40AY 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 STPS1L40AY reliable?
The price and inventory of STPS1L40AY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STPS1L40AY is usually 5 days.
3.What payment methods are accepted for STPS1L40AY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STPS1L40AY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STPS1L40AY?
STPS1L40AY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STPS1L40AY 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 STPS1L40AY?
For technical support, including STPS1L40AY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STPS1L40AY requirements.
6.How does Aetrix verify that STPS1L40AY is sourced from the original manufacturer or authorized distributors?
All STPS1L40AY 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 STPS1L40AY meets industry standards.
7.What is the process for return or replacement of STPS1L40AY?
All STPS1L40AY units undergo pre-shipment inspection (PSI). If there is an issue with STPS1L40AY, 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 STPS1L40AY part is unused and in its original packaging.
Return procedure for STPS1L40AY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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