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STMicroelectronics STPS1L40M
- Part No.:
- STPS1L40M
- Manufacturer:
- STMicroelectronics
- Category:
- Single Diodes
- Package:
- DO-216AA
- Datasheet:
-
STPS1L40M.pdf
- Description:
- DIODE SCHOTTKY 40V 1A STMITE
- Quantity:
- Payment:
- Shipping:
Inventory:49,507
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Product details
Overview
STPS1L40M from STMicroelectronics is a single low-drop Schottky rectifier optimized for high-frequency DC-DC converters and switch-mode power supplies, featuring 1 A average forward current (IF(AV)), 40 V repetitive peak reverse voltage (VRRM), 0.40 V maximum forward voltage at 1 A/25°C, 150°C maximum junction temperature, and STmite (DO-216AA) surface-mount package. It enables high-efficiency, compact power conversion in battery-powered portable electronics.
For engineers reviewing the STPS1L40M datasheet, STPS1L40M pinout, STPS1L40M application, or STPS1L40M equivalent, key selection criteria include its ultra-low VF for reduced conduction loss, avalanche-rated surge capability (50 A IFSM), thermal resistance (Rth(j-c) = 20°C/W), and suitability for polarity protection and freewheeling in space-constrained designs.
Technical Context
This Schottky diode operates without minority-carrier storage, delivering negligible reverse recovery time and eliminating switching losses in high-frequency topologies. Its metal-semiconductor junction yields low forward voltage drop and fast turn-on/turn-off behavior critical for >100 kHz DC-DC stages.
The device is rated for 1200 W repetitive peak avalanche power at 1 µs pulse width and 25°C junction temperature, with dV/dt capability of 10,000 V/µs - enabling robust operation in inductive switching environments such as synchronous rectification and flyback snubbers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| IF(AV) | 1 A at Tc = 140°C, δ = 0.5 - defines continuous DC output current handling in thermally managed PCB layouts |
| VRRM | 40 V - maximum reverse blocking voltage before breakdown; sets upper limit for input/output rail separation in low-voltage converters |
| VF (max) | 0.40 V at IF = 1 A, Tj = 25°C - directly reduces conduction loss to ~0.34 W baseline, improving efficiency in 3.3–12 V systems |
| Rth(j-c) | 20 °C/W - junction-to-case thermal resistance enables direct thermal coupling to copper pour or heatsink for sustained 1 A operation |
| IFSM | 50 A (10 ms sinusoidal) - supports short-term overload tolerance during startup or transient events in adapter and charger designs |
| dV/dt | 10,000 V/µs - ensures stable operation under rapid voltage transients common in synchronous buck and LLC resonant circuits |
Pinout & Package
STPS1L40M is housed in the STmite package (JEDEC DO-216AA), a miniature surface-mount plastic case with exposed cathode tab for thermal and electrical connection. The package measures 1.75–2.05 mm × 1.75–2.05 mm × 3.60–3.90 mm and weighs 15.5 mg.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry node | Connected to input/source side in rectification; requires low-inductance trace routing to minimize ringing |
| Cathode (tab) | Forward current exit / thermal path | Exposed metal pad serves as both electrical return and primary heat dissipation path to PCB copper |
Key Features
| Feature | Design Value |
|---|---|
| Low forward voltage drop | VF ≤ 0.40 V @ 1 A/25°C - cuts conduction loss by ≥30% vs. standard silicon diodes, extending battery runtime in portable devices |
| Avalanche energy rating | 1200 W peak at 1 µs - provides validated ruggedness against inductive kickback without external clamping |
| High dV/dt immunity | 10,000 V/µs - prevents false turn-on in noisy high-speed switching nodes, improving system reliability |
| Miniature STmite package | DO-216AA footprint (≈2.0 × 2.0 mm) - enables dense layout in PCMCIA cards, USB-C PD adapters, and ultra-thin notebooks |
Applications
| USB Power Delivery Adapter | Portable Device Battery Protection |
|---|---|
Use Scenario: Secondary-side synchronous rectification in 20–65 W GaN-based USB-PD adapters operating at 200–500 kHz. IC Role / Device Role / Timing Role: Low-VF Schottky rectifier replacing MOSFET gate drivers in cost-sensitive designs; conducts during transformer secondary half-cycle. Use Value: 0.40 V VF minimizes power loss at 3–5 A load currents, maintaining >94% efficiency while avoiding thermal derating on 2-layer PCBs. | Use Scenario: Reverse-polarity and overvoltage protection circuitry in lithium-ion powered handheld instruments and medical sensors. IC Role / Device Role / Timing Role: Unidirectional current gate placed between battery connector and system PMIC; blocks fault current during misinsertion. Use Value: 40 V VRRM withstands accidental 24 V bench supply connection; 50 A IFSM survives brief short-circuit events without degradation. |
| PCMCIA Card Power Switching | Low-Voltage DC-DC Converter Freewheeling |
Use Scenario: Input rectification and hot-swap current limiting in legacy PCMCIA Type II peripheral cards (3.3 V/5 V dual-rail). IC Role / Device Role / Timing Role: Primary input diode in discrete OR-ing configuration; handles up to 1 A continuous with minimal voltage sag. Use Value: 20 °C/W Rth(j-c) allows direct mounting to card-edge copper, sustaining full current without external heatsink in 10 mm² area. | Use Scenario: Freewheeling path in 1 MHz buck converter powering FPGA core rails (0.8–1.2 V @ 4–6 A) in embedded controllers. IC Role / Device Role / Timing Role: Fast-recovery path for inductor current during high-side switch off-time; zero reverse recovery charge eliminates switching spikes. Use Value: Negligible Qrr and <1 ns reverse recovery enable clean waveform integrity, reducing EMI filter component count by 20%. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Diodes Inc. SB140-TB | VF = 0.5 V @ 1 A, Rth(j-c) = 25 °C/W, DO-41 through-hole package | Requires through-hole assembly and larger board area; lacks avalanche rating | Choose only for legacy through-hole production where reflow compatibility is not required |
| Vishay SS14-E3/5AT | VF = 0.5 V @ 1 A, IF(AV) = 1 A, SMA package, no specified avalanche power | SMA footprint is larger (4.5 × 2.7 mm); no dV/dt or avalanche data published | Select when DO-216AA footprint is unavailable and 0.1 V higher VF is acceptable in thermal budget |
Compared with SB140-TB and SS14-E3/5AT, STPS1L40M delivers lower conduction loss, verified avalanche ruggedness, and superior thermal performance in the smallest SMD footprint - making it optimal for next-generation portable power stages where size, efficiency, and reliability are co-constrained.
Availability
STPS1L40M is available at Aetrix Electronics and suitable for USB Power Delivery adapters, portable medical sensors, PCMCIA peripherals, and low-voltage DC-DC converters requiring stable component supply across multi-year production cycles.
Supply support for STPS1L40M 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.
STPS1L40M belongs to ST's STmite Schottky rectifier product line, engineered specifically for miniaturized, high-efficiency power conversion in battery-powered and space-constrained applications.
FAQ
Is STPS1L40M suitable for synchronous rectification?
No - STPS1L40M is a passive Schottky diode, not a synchronous rectifier IC or MOSFET driver. It functions as a self-commutated freewheeling or output rectifier. For true synchronous rectification, a dedicated gate driver IC controlling an N-channel MOSFET is required; this diode serves as a simpler, lower-cost alternative where timing control isn't needed.
What is the maximum PCB copper area needed for 1 A continuous operation?
Per Figure 11, Rth(j-a) drops from 250°C/W to ~120°C/W with 100 mm² of 35 µm copper under the cathode tab on FR4. For reliable 1 A continuous operation at ambient ≤60°C, ≥80 mm² of unbroken 2-oz copper connected to the tab is recommended to maintain Tj ≤130°C without forced airflow.
Does STPS1L40M have a specified reverse recovery time (trr)?
No - as a Schottky barrier diode, STPS1L40M has no minority carrier storage; its switching is majority-carrier dominated and effectively instantaneous. Datasheet specifies only dV/dt immunity (10,000 V/µs) and negligible switching losses - trr is not defined or measured, consistent with all true Schottky rectifiers.
Can STPS1L40M replace a 1N5819 in existing designs?
Yes - STPS1L40M matches 1N5819's 1 A/40 V ratings but improves VF by ~0.1 V and offers superior thermal resistance (20°C/W vs. ~50°C/W for DO-41). However, its DO-216AA footprint is incompatible with 1N5819's DO-41 holes; redesign of land pattern and stencil is required for SMT assembly.
STPS1L40M Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- DO-216AA
- 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:
- 460 mV @ 1 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 63 µA @ 40 V
- Capacitance @ Vr, F:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- STmite
- Operating Temperature - Junction:
- 150°C (Max)
STPS1L40M FAQ
1.How can I place an order for STPS1L40M through Aetrix?
Please submit a Request for Quotation (RFQ) for STPS1L40M 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 STPS1L40M reliable?
The price and inventory of STPS1L40M are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STPS1L40M is usually 5 days.
3.What payment methods are accepted for STPS1L40M?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STPS1L40M transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STPS1L40M?
STPS1L40M orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STPS1L40M 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 STPS1L40M?
For technical support, including STPS1L40M datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STPS1L40M requirements.
6.How does Aetrix verify that STPS1L40M is sourced from the original manufacturer or authorized distributors?
All STPS1L40M 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 STPS1L40M meets industry standards.
7.What is the process for return or replacement of STPS1L40M?
All STPS1L40M units undergo pre-shipment inspection (PSI). If there is an issue with STPS1L40M, 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 STPS1L40M part is unused and in its original packaging.
Return procedure for STPS1L40M:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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