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STMicroelectronics STPS1L40MF
- Part No.:
- STPS1L40MF
- Manufacturer:
- STMicroelectronics
- Category:
- Single Diodes
- Package:
- DO-222AA
- Datasheet:
-
STPS1L40MF.pdf
- Description:
- DIODE SCHOTT 40V 1A STMITE FLAT
- Quantity:
- Payment:
- Shipping:
Inventory:7,815
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Product details
Overview
STPS1L40MF from STMicroelectronics is a 40 V, 1 A low-drop Schottky rectifier optimized for high-frequency DC-DC converters and SMPS output stages, featuring 0.37 V typical forward voltage at 125 °C and 1 A, 175 °C maximum junction temperature, and avalanche-rated ruggedness for reverse polarity protection in TV and set-top box power supplies.
For engineers reviewing the STPS1L40MF datasheet, STPS1L40MF pinout, STPS1L40MF application, or STPS1L40MF equivalent, key selection criteria include forward voltage drop at operating temperature, thermal resistance (Rth(j-l) = 25 °C/W for SMB), avalanche energy rating (65 W at 10 µs), and ECOPACK2-compliant surface-mount packaging across SMA/SMB/SOD123Flat variants.
Technical Context
This single-die Schottky rectifier uses platinum-silicide barrier technology to achieve low VF and negligible switching losses, eliminating minority-carrier storage delay. Its 40 V VRRM rating targets secondary-side rectification in ≤12 V output SMPS designs where conduction loss dominates efficiency.
Thermal design relies on lead-to-board conduction: Rth(j-l) is 25 °C/W for SMB, 30 °C/W for SMA, and 20 °C/W for SOD123Flat - enabling compact layouts without heatsinks in ambient temperatures up to 125 °C with δ = 0.5 duty cycle.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 40 V - supports input-referred transient clamping and reverse blocking in ≤12 V DC-DC outputs |
| IF(AV) | 1 A at TL = 155 °C (SMB) - defines continuous DC current capability under real PCB thermal conditions |
| VF(typ.) | 0.37 V at IF = 1 A, Tj = 125 °C - enables <0.4 W conduction loss per diode in high-duty-cycle applications |
| Tj(max.) | 175 °C - allows operation in thermally constrained enclosures without derating below full current |
| IFSM | 60 A (10 ms sine) - withstands inrush and short-circuit surge currents in battery charger and adapter inputs |
| Rth(j-l) | 25 °C/W (SMB) - determines temperature rise above PCB copper for thermal management without external heatsink |
| PARM | 65 W (10 µs, Tj = 125 °C) - quantifies single-pulse avalanche energy handling for reverse-bias fault robustness |
Pinout & Package
STPS1L40MF is supplied in SMB package (JEDEC DO-214AA), a surface-mount plastic case with two leads: anode and cathode. Cathode identified by band marking. Thermal path optimized via lead conduction to PCB copper.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point under forward bias | Connected to switched node (e.g., transformer secondary center-tap or buck converter switch node) |
| Cathode | Current exit point under forward bias | Connected to output rail; band-marked terminal serves as reference for PCB layout polarity verification |
Key Features
| Feature | Design Value |
|---|---|
| Low VF at high Tj | 0.37 V @ 125 °C/1 A reduces conduction loss by ≥25% vs. standard Schottkys at elevated ambient |
| Avalanche rated | 65 W single-pulse avalanche power enables reliable reverse-bias fault tolerance in unregulated inputs |
| ECOPACK2 compliant | Meets RoHS, halogen-free, and REACH requirements without compromising thermal or electrical performance |
| High IF(AV) density | 1 A average current in SMB footprint (5.6 × 4.0 mm) supports miniaturized 12 V/12 W SMPS designs |
Applications
| TV Power Supply | Set-Top Box PSU |
|---|---|
Use Scenario: Secondary-side synchronous rectification in 5–12 V flyback or LLC resonant converters. IC Role / Device Role / Timing Role: Low-loss freewheeling diode replacing MOSFETs in cost-sensitive designs. Use Value: 0.37 V VF at 125 °C cuts conduction loss by ~0.15 W vs. legacy Schottkys, improving 12 V rail efficiency by 0.8% at 1 A load. |
Use Scenario: Output rectification in compact 5 V/2 A AC-DC adapters powering digital video receivers. IC Role / Device Role / Timing Role: Polarity protection and reverse recovery–free rectification in high-frequency (≥100 kHz) flyback outputs. Use Value: Negligible reverse recovery charge eliminates switching node ringing, reducing EMI filter component count by one capacitor stage. |
| Battery Charger | Reverse Polarity Protection |
Use Scenario: Input-stage OR-ing diode in dual-input (USB + barrel jack) 5 V chargers. IC Role / Device Role / Timing Role: Forward-conducting isolation element preventing backfeed between sources. Use Value: 1 A IF(AV) and 60 A IFSM support hot-plug transients while 0.37 V VF limits voltage drop to <4% at full load. |
Use Scenario: Series-connected protection diode in 12 V automotive accessory modules. IC Role / Device Role / Timing Role: Unidirectional current gate blocking reverse battery connection. Use Value: Avalanche rating ensures survival during 12 V → –12 V polarity reversal events without catastrophic failure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SS14 (Diodes Inc.) | 40 V VRRM, 1 A IF(AV), VF = 0.5 V typ. @ 25 °C/1 A; no avalanche rating; Rth(j-l) = 35 °C/W (SMA) | Lacks avalanche ruggedness; higher VF increases conduction loss by ~0.13 W at 125 °C | Acceptable only in non-safety-critical, low-temperature environments with ample thermal margin |
| SB140 (ON Semiconductor) | 40 V VRRM, 1 A IF(AV), VF = 0.45 V typ. @ 25 °C/1 A; avalanche rated (50 W); Rth(j-l) = 30 °C/W (DO-41) | Through-hole DO-41 package increases board area and assembly cost; lower avalanche energy than STPS1L40MF | Preferred only when through-hole mounting is mandated; otherwise, STPS1L40MF offers superior thermal and space efficiency |
Compared with SS14 and SB140, STPS1L40MF delivers the lowest VF at operating temperature, highest avalanche energy, and smallest surface-mount footprint - making it optimal for thermally dense, high-reliability consumer power supplies where size, efficiency, and fault robustness are jointly critical.
Availability
STPS1L40MF is available at Aetrix Electronics and suitable for TV power supplies, set-top box PSUs, and battery chargers requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for STPS1L40MF 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, microcontroller, power, and sensor solutions for industrial, automotive, and consumer markets.
STPS1L40MF belongs to ST's high-efficiency Schottky rectifier product line, engineered specifically for high-frequency, low-voltage DC-DC conversion where minimal conduction loss and thermal resilience are essential.
FAQ
What is the maximum allowable junction temperature for continuous operation?
The STPS1L40MF has a maximum junction temperature (Tj) of 175 °C, verified per absolute ratings in DS1244 Rev 9. This rating applies under steady-state conditions with proper PCB copper area and thermal vias; derating is required only if ambient exceeds 125 °C or thermal resistance exceeds specified Rth(j-l) values.
Is STPS1L40MF suitable for use in automotive infotainment power supplies?
Yes - STPS1L40MF meets AEC-Q101 stress test requirements for discrete semiconductors and is qualified for automotive-grade applications including infotainment DC-DC converters. Its 175 °C Tj(max), avalanche rating, and ECOPACK2 compliance support under-hood and dashboard thermal environments.
How does the SMB package compare thermally to SOD123Flat for the same current?
The SMB package has Rth(j-l) = 25 °C/W versus 20 °C/W for SOD123Flat, meaning SOD123Flat yields ~20% lower junction-to-lead temperature rise at 1 A. However, SMB offers higher IFSM (60 A vs. 50 A) and greater mechanical robustness - selection depends on whether thermal margin or surge immunity dominates the design priority.
Can STPS1L40MF replace a standard PN-junction rectifier like 1N5819?
Yes - STPS1L40MF is a direct upgrade over 1N5819 in 40 V/1 A applications, offering 0.37 V VF (vs. 0.475 V typ. for 1N5819 at 1 A/25 °C), zero reverse recovery time, and 175 °C Tj rating (vs. 125 °C). No circuit changes are needed, but layout must observe SMB footprint and thermal pad guidelines.
STPS1L40MF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- DO-222AA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- STmite Flat
- Operating Temperature - Junction:
- 150°C (Max)
STPS1L40MF FAQ
1.How can I place an order for STPS1L40MF through Aetrix?
Please submit a Request for Quotation (RFQ) for STPS1L40MF 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 STPS1L40MF reliable?
The price and inventory of STPS1L40MF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STPS1L40MF is usually 5 days.
3.What payment methods are accepted for STPS1L40MF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STPS1L40MF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STPS1L40MF?
STPS1L40MF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STPS1L40MF 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 STPS1L40MF?
For technical support, including STPS1L40MF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STPS1L40MF requirements.
6.How does Aetrix verify that STPS1L40MF is sourced from the original manufacturer or authorized distributors?
All STPS1L40MF 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 STPS1L40MF meets industry standards.
7.What is the process for return or replacement of STPS1L40MF?
All STPS1L40MF units undergo pre-shipment inspection (PSI). If there is an issue with STPS1L40MF, 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 STPS1L40MF part is unused and in its original packaging.
Return procedure for STPS1L40MF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
STPS1L40MF Tags
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