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STMicroelectronics STPS140AY
- Part No.:
- STPS140AY
- Manufacturer:
- STMicroelectronics
- Category:
- Single Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
STPS140AY.pdf
- Description:
- DIODE SCHOTTKY 40V 1A SMA
- Quantity:
- Payment:
- Shipping:
Inventory:2,243
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Product details
Overview
STPS140AY from STMicroelectronics is an automotive-qualified Schottky rectifier diode in SMA (DO-214AC) package, rated for 1 A average forward current and 40 V repetitive peak reverse voltage, with max 0.55 V forward voltage at 1 A and 25 °C, designed for low-voltage, high-frequency DC-DC converters and polarity protection in engine control units and body electronics.
For engineers reviewing the STPS140AY datasheet, STPS140AY pinout, STPS140AY application, or STPS140AY equivalent, key selection criteria include its AEC-Q101 qualification, 150 °C max junction temperature, avalanche-rated 900 W peak power, ECOPACK®2 compliance, and surface-mount SMA footprint optimized for thermal performance in space-constrained automotive modules.
Technical Context
This Schottky rectifier operates as a unidirectional, low-loss power switching device with negligible reverse recovery charge and no minority-carrier storage delay-enabling efficient operation in 100 kHz–1 MHz switching topologies. Its metal-semiconductor junction delivers conduction losses governed by VF ≈ 0.4 × IF(AV) + 0.10 × IF²(RMS), and it sustains 60 A non-repetitive surge current for 10 ms.
The device features specified avalanche capability (900 W at 1 µs, 25 °C), junction-to-lead thermal resistance of 30 °C/W (SMA), and is characterized across -40 to +150 °C operating junction range-ensuring robustness under transient overvoltage and thermal stress in automotive environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| IF(AV) | 1 A - maximum continuous forward current at TL = 130 °C with 0.5 duty cycle, defining steady-state power handling in DC-DC stages |
| VRRM | 40 V - peak reverse blocking voltage, suitable for 12 V/24 V automotive bus systems with margin against load-dump transients |
| VF (max) | 0.55 V @ 1 A, 25 °C - low conduction loss enabling >92% efficiency in 5 V output buck converters at full load |
| Tj (max) | +150 °C - extended junction temperature rating allowing placement near hot components without derating in under-hood modules |
| Rth(j-l) | 30 °C/W - junction-to-lead thermal resistance (SMA), enabling direct PCB copper pour heat sinking without external heatsink |
| IFSM | 60 A @ 10 ms - surge current rating supporting cold-crank and jump-start conditions in battery-connected circuits |
| dV/dt | 10,000 V/µs - critical rate of rise of reverse voltage, ensuring stable operation during fast-switching MOSFET commutation |
Pinout & Package
STPS140AY uses the SMA (JEDEC DO-214AC) surface-mount package with cathode indicated by a band on the body. The two-terminal device has no internal connections beyond anode and cathode.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point | Connected to input/source side (e.g., battery+, switch node); must be routed with low-inductance trace for EMI control |
| Cathode | Forward current exit point | Connected to output/load side (e.g., converter output, protected subsystem); marked by molded band for orientation verification |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive use per stress test requirements including HTOL, TC, HAST, and mechanical shock-enabling deployment in powertrain and chassis modules |
| ECOPACK®2 compliant | Halogen-free, RoHS-compliant epoxy package meeting stringent automotive environmental standards without compromising thermal or mechanical reliability |
| Negligible switching losses | No reverse recovery time (trr ≈ 0 ns) eliminates turn-off switching loss and associated EMI in high-frequency SMPS designs |
| Avalanche capability | Rated for 900 W repetitive peak avalanche power at 1 µs pulse width-protects against inductive kickback in motor driver freewheeling paths |
| Low VF temperature coefficient | VF drops to 0.43 V at 125 °C (vs. 0.55 V at 25 °C), reducing conduction loss under thermal stress and improving system thermal stability |
Applications
| Engine Control Unit (ECU) Power Input Protection | Automotive Infotainment DC-DC Converter |
|---|---|
Use Scenario: Reverse polarity protection at 12 V main input of engine control unit exposed to service wiring errors or jump-start misconnections. IC Role / Device Role / Timing Role: Unidirectional blocking diode placed in series with input rail; conducts only during correct polarity, clamping reverse voltage via avalanche if exceeded. Use Value: Prevents catastrophic failure of downstream MCU and CAN transceivers; leverages 40 V VRRM and 60 A IFSM to survive jump-start surges and load-dump events. | Use Scenario: Output rectification in 300 kHz synchronous buck converter supplying 5 V to display controller and audio DSP in head unit. IC Role / Device Role / Timing Role: Freewheeling diode replacing high-side MOSFET body diode during low-side conduction phase; enables zero-voltage switching transition. Use Value: Reduces conduction loss by 40% vs. standard PN diode, lowering thermal load on compact PCB and eliminating reverse recovery noise coupling into sensitive analog audio paths. |
| Body Control Module (BCM) Load Switching | ADAS Camera Power Supply |
Use Scenario: Polarity-protected 24 V supply for window lift motor drivers and door lock actuators in centralized BCM. IC Role / Device Role / Timing Role: Input protection diode upstream of load switches; handles intermittent 100 ms surges during motor stall and stall recovery. Use Value: Sustains 60 A IFSM without degradation, avoids fuse coordination issues, and maintains <0.55 V drop to preserve voltage margin for logic-level gate drive circuits. | Use Scenario: Input rectification and hold-up in 12 V to 3.3 V isolated flyback supply powering CMOS image sensor and ISP in rear-view camera module. IC Role / Device Role / Timing Role: Primary rectifier on secondary side; operates continuously at 1 A with minimal self-heating due to 30 °C/W Rth(j-l). Use Value: Enables compact 8 mm × 6 mm layout with 1.5 cm² copper pour per lead, achieving <45 °C temperature rise at full load-critical for lens focus stability. |
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, 200 V VRRM, 1 A IF(AV), but VF = 0.75 V @ 1 A - 36% higher conduction loss | Higher voltage rating suits 48 V mild-hybrid systems; unsuitable for 12 V/24 V low-drop applications where VF matters | Select only when reverse voltage margin >200 V is required; avoid in thermally constrained 12 V domains |
| Vishay VS-1EWH04-M3/5A | SMB package (DO-214AA), same 40 V/1 A rating, VF = 0.52 V @ 1 A, but Rth(j-l) = 25 °C/W - better thermal dissipation | Larger footprint increases PCB area; preferred where board space allows and thermal performance is prioritized over size | Choose for higher ambient temperature environments (>85 °C) or when using double-sided copper pours for enhanced cooling |
Compared with NSS1C200MT1G and VS-1EWH04-M3/5A, STPS140AY offers optimal balance of low VF (0.55 V), AEC-Q101 qualification, and minimal SMA footprint-making it the preferred choice for cost- and space-sensitive 12 V automotive modules where 40 V blocking suffices.
Availability
STPS140AY is available at Aetrix Electronics and suitable for engine control units, infotainment power supplies, and body control modules requiring stable component supply across automotive production lifecycles.
Supply support for STPS140AY 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.
STPS140AY belongs to ST's automotive-grade Schottky rectifier product line, engineered specifically for high-reliability, low-loss power conversion in harsh-temperature vehicle subsystems-from start-stop battery management to ADAS camera power rails.
FAQ
Is STPS140AY suitable for 48 V mild-hybrid automotive systems?
No. With a 40 V repetitive peak reverse voltage rating, STPS140AY is designed for conventional 12 V and 24 V automotive architectures. It lacks sufficient voltage margin for 48 V nominal systems, where transients can exceed 60 V. For 48 V applications, ST recommends the STPS2H100CW (100 V, AEC-Q101) or similar higher-VRRM Schottky rectifiers.
What is the maximum PCB copper area needed to maintain Tj ≤ 150 °C at 1 A continuous?
At 1 A average forward current and ambient temperature of 85 °C, STPS140AY requires ≥1.5 cm² of 35 µm-thick copper per lead on FR4 PCB (per Figure 12) to achieve Rth(j-a) ≈ 100 °C/W and limit junction temperature to ≤150 °C. Using internal layers or thermal vias further improves margin.
Does STPS140AY require a heatsink in typical automotive applications?
No external heatsink is required. Its 30 °C/W junction-to-lead thermal resistance and SMA package allow effective heat transfer directly to PCB copper. When mounted on ≥1.5 cm² of 2 oz copper per lead, junction temperature remains within spec even at full 1 A load and 85 °C ambient-verified per Figure 2 and thermal derating curves.
How does the avalanche rating impact circuit design?
The 900 W repetitive avalanche rating (at 1 µs, 25 °C) enables safe energy absorption during inductive turn-off events-such as freewheeling in motor drivers or relay coils-without requiring external snubbers. Designers must ensure pulse duration and repetition rate stay within Figure 3/4 derating limits to avoid cumulative thermal stress.
STPS140AY 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:
- 650 mV @ 2 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 12 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
STPS140AY FAQ
1.How can I place an order for STPS140AY through Aetrix?
Please submit a Request for Quotation (RFQ) for STPS140AY 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 STPS140AY reliable?
The price and inventory of STPS140AY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STPS140AY is usually 5 days.
3.What payment methods are accepted for STPS140AY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STPS140AY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STPS140AY?
STPS140AY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STPS140AY 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 STPS140AY?
For technical support, including STPS140AY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STPS140AY requirements.
6.How does Aetrix verify that STPS140AY is sourced from the original manufacturer or authorized distributors?
All STPS140AY 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 STPS140AY meets industry standards.
7.What is the process for return or replacement of STPS140AY?
All STPS140AY units undergo pre-shipment inspection (PSI). If there is an issue with STPS140AY, 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 STPS140AY part is unused and in its original packaging.
Return procedure for STPS140AY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
STPS140AY Tags
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