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STMicroelectronics STPS1L40AFN
- Part No.:
- STPS1L40AFN
- Manufacturer:
- STMicroelectronics
- Category:
- Single Diodes
- Package:
- DO-221AC, SMA Flat Leads
- Datasheet:
-
STPS1L40AFN.pdf
- Description:
- DIODE SCHOTTKY 40V 1A SMAFLAT
- Quantity:
- Payment:
- Shipping:
Inventory:4,262
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Product details
Overview
STPS1L40AFN from STMicroelectronics is a 40 V, 1 A low-drop Schottky rectifier in SMA Flat Notch package, designed for high-frequency DC-DC converters and reverse polarity protection circuits. It delivers typ. 0.37 V forward voltage at 1 A/125 °C, supports 175 °C max junction temperature, and is avalanche rated with 65 W peak repetitive avalanche power (tp = 10 µs).
For engineers reviewing the STPS1L40AFN datasheet, STPS1L40AFN pinout, STPS1L40AFN application, or STPS1L40AFN equivalent, key selection criteria include forward voltage drop at 1 A, thermal resistance (Rth(j-l) = 20 °C/W), avalanche ruggedness, ECOPACK2 compliance, and surface-mount compatibility with SMA Flat Notch footprint.
Technical Context
This single-die Schottky rectifier operates without minority-carrier storage, enabling negligible switching losses and fast recovery in high-frequency SMPS topologies. Its low VF and high IF(AV) rating support efficient low-voltage output stages in TV and set-top box power supplies.
The device is qualified for operation up to 175 °C junction temperature and features robust avalanche capability (65 W, 10 µs pulse), making it suitable for transient-prone input protection and freewheeling paths where energy clamping is required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 40 V - Maximum repetitive reverse blocking voltage; defines safe operating range in polarity protection and freewheeling applications. |
| IF(AV) | 1 A - Average forward current at TL = 160 °C; sets continuous conduction capability in DC-DC output rectification. |
| VF(typ.) | 0.37 V @ 1 A, 125 °C - Low conduction loss enables >92% efficiency in 3.3–5 V output rails at moderate load. |
| Rth(j-l) | 20 °C/W - Junction-to-lead thermal resistance; enables direct PCB copper pad heat sinking without external heatsink. |
| PARM | 65 W @ tp = 10 µs, Tj = 125 °C - Peak repetitive avalanche power; supports reliable clamping of inductive switch-off transients. |
| Tj(max.) | 175 °C - Maximum junction temperature; allows operation in thermally constrained consumer power enclosures. |
| IR(max) | 10 mA @ VR = VRRM, Tj = 125 °C - Reverse leakage limit; ensures minimal standby power loss in battery-backed systems. |
Pinout & Package
SMA Flat Notch package: surface-mount, cathode indicated by band, lead-free, UL94 V0 epoxy, optimized for conduction cooling via PCB copper pads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point | Connected to input/high-side node in reverse polarity protection or freewheeling path. |
| Cathode | Forward current exit point | Connected to output/load side; marked by flat notch/band; ties to system ground or return rail. |
Key Features
| Feature | Design Value |
|---|---|
| Low VF typ. 0.37 V @ 1 A/125 °C | Reduces conduction loss to ~0.37 W, critical for thermally limited consumer power supplies. |
| Avalanche rated (65 W, 10 µs) | Withstands repetitive inductive energy spikes without degradation-no external snubber needed. |
| Rth(j-l) = 20 °C/W | Enables >1.5 W power dissipation with ≤30 °C rise over ambient using only 2 cm² copper per lead. |
| ECOPACK2 compliant | Fully RoHS-compliant, halogen-free, and REACH-conformant for global consumer electronics markets. |
| SMA Flat Notch footprint | Smaller than standard SMA; improves board density and reduces parasitic inductance vs. SMB/SOD123Flat variants. |
Applications
| Reverse Polarity Protection | TV Power Supply Output Rectification |
|---|---|
Use Scenario: Prevents damage when 12 V DC input is accidentally reversed in wall-powered consumer devices. IC Role / Device Role / Timing Role: Series-connected Schottky diode acting as unidirectional current gate on main input rail. Use Value: Enables fail-safe operation with <0.4 V insertion loss, preserving >96% input voltage under full load. |
Use Scenario: Rectifies 5 V/3 A output from resonant LLC converter in modern LED-backlit TVs. IC Role / Device Role / Timing Role: Synchronous rectifier replacement in secondary-side freewheeling path. Use Value: Delivers 0.37 V VF at 125 °C, reducing rectifier loss by 35% vs. legacy 0.55 V Schottkys. |
| Battery Charger Input Stage | Set-Top Box DC-DC Converter Freewheeling |
Use Scenario: Blocks reverse current from Li-ion battery into USB-C PD input during adapter disconnection. IC Role / Device Role / Timing Role: Back-to-back configured or single-series diode in charger IC input protection block. Use Value: 10 mA IR max at 125 °C ensures <1 µA standby drain-preserves battery charge over weeks of idle time. |
Use Scenario: Freewheeling path in 3.3 V buck converter supplying SoC core voltage in cable/satellite receivers. IC Role / Device Role / Timing Role: Low-loss flyback path during high-side MOSFET off-time in 500 kHz switching. Use Value: Negligible reverse recovery eliminates switching loss penalty, sustaining >94% efficiency at light loads. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STPS1L40A | SMA package (Rth(j-l) = 30 °C/W); 68 mg mass; same electrical specs. | Higher thermal resistance requires larger copper area; less compact footprint than Flat Notch. | Select when existing layout uses standard SMA land pattern and thermal margin ≥40 °C/W is available. |
| STPS1L40U | SMB package (Rth(j-l) = 25 °C/W); 107 mg mass; identical VF/VRRM/IF(AV). | Wider body increases board area; higher IFSM (60 A) but same PARM (65 W). | Prefer for designs needing higher surge robustness and existing SMB footprint compatibility. |
Compared with STPS1L40A and STPS1L40U, the STPS1L40AFN offers the lowest Rth(j-l) (20 °C/W) and smallest footprint among STPS1L40 variants-enabling higher power density and better thermal performance in space-constrained consumer power modules.
Availability
STPS1L40AFN is available at Aetrix Electronics and suitable for TV power supply output rectification, set-top box DC-DC converter freewheeling, and battery charger input stage applications requiring stable component supply and long-term industrial availability.
Supply support for STPS1L40AFN 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 automotive, industrial, and consumer markets.
The STPS1L40 series belongs to ST's high-efficiency Schottky rectifier product line, engineered specifically for low-VF, high-reliability operation in consumer-grade switched-mode power supplies and portable charging systems.
FAQ
What is the cathode marking method for STPS1L40AFN?
The cathode is identified by a flat notch on one end of the SMA Flat Notch package body, consistent with JEDEC-standard orientation. This band aligns with the cathode terminal in the recommended footprint (Figure 21, DS1244 Rev 9), and must be oriented toward the system ground or return rail during placement.
Can STPS1L40AFN replace STPS1L40U in an SMB footprint?
No-STPS1L40AFN uses the SMA Flat Notch package (2.25–2.90 mm D, 5.00–5.35 mm E), while STPS1L40U uses SMB (3.30–3.95 mm D, 5.10–5.60 mm E). The footprints are mechanically incompatible; direct substitution requires PCB redesign and requalification of thermal performance.
What is the maximum allowable PCB copper area for optimal thermal performance?
Per Figure 15 (DS1244 Rev 9), Rth(j-a) drops from ~50 °C/W (no copper) to ~25 °C/W with 2 cm² copper per lead on FR4. For continuous 1 A operation at 70 °C ambient, ≥3 cm² total copper (1.5 cm² per lead) is recommended to maintain Tj ≤ 150 °C without forced airflow.
Is STPS1L40AFN suitable for automotive applications?
STPS1L40AFN is not AEC-Q101 qualified and lacks automotive-specific qualification testing (e.g., HTOL, temperature cycling). While its 175 °C Tj(max) meets under-hood temperature requirements, ST recommends automotive-grade alternatives like STPS1H100CG for certified automotive use.
STPS1L40AFN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- DO-221AC, SMA Flat Leads
- 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:
- SMAflat Notch
- Operating Temperature - Junction:
- 175°C
STPS1L40AFN FAQ
1.How can I place an order for STPS1L40AFN through Aetrix?
Please submit a Request for Quotation (RFQ) for STPS1L40AFN 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 STPS1L40AFN reliable?
The price and inventory of STPS1L40AFN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STPS1L40AFN is usually 5 days.
3.What payment methods are accepted for STPS1L40AFN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STPS1L40AFN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STPS1L40AFN?
STPS1L40AFN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STPS1L40AFN 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 STPS1L40AFN?
For technical support, including STPS1L40AFN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STPS1L40AFN requirements.
6.How does Aetrix verify that STPS1L40AFN is sourced from the original manufacturer or authorized distributors?
All STPS1L40AFN 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 STPS1L40AFN meets industry standards.
7.What is the process for return or replacement of STPS1L40AFN?
All STPS1L40AFN units undergo pre-shipment inspection (PSI). If there is an issue with STPS1L40AFN, 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 STPS1L40AFN part is unused and in its original packaging.
Return procedure for STPS1L40AFN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
STPS1L40AFN Tags
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