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Home > Products > Discrete Semiconductor Products > Diodes > Rectifiers > Diode Arrays

STMicroelectronics STPS40SM80CFP

Name: STPS40SM80CFP
Brand: STMicroelectronics
SKU: STPS40SM80CFP
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STPS40SM80CFP

Manufacturer:: STMicroelectronics

Category:: Diode Arrays

Package:: TO-220-3 Full Pack

Datasheet:: STPS40SM80CFP.pdf

Description:: DIODE ARR SCHOTT 80V TO-220FPAB

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Product details

Overview

STPS40SM80CFP from STMicroelectronics is a dual common-cathode Schottky rectifier in insulated TO-220FPAB package, rated for 80 V repetitive peak reverse voltage and 2 × 20 A average forward current per diode at Tc = 90 °C, with typical forward voltage of 520 mV at 10 A and 25 °C - optimized for high-frequency SMPS in notebook adapters and LCD TV power supplies.

For engineers reviewing the STPS40SM80CFP datasheet, STPS40SM80CFP pinout, STPS40SM80CFP application, or STPS40SM80CFP equivalent, this device's insulated 2000 V isolation rating, 45 pF package capacitance, avalanche-rated operation (100 V, 28.5 A), and thermal resistance of 4.90 °C/W (junction-to-case, per diode) are critical for adapter-level thermal and safety compliance.

Technical Context

This dual Schottky rectifier integrates two independent anode terminals (A1, A2) and one shared cathode (K) in a single insulated package, enabling synchronous or interleaved conduction paths in dual-output or redundant SMPS topologies. Its low VF–IR trade-off supports efficiency targets >90% at light-to-full load in 65–100 kHz converters.

The TO-220FPAB package provides 2000 V isolation between mounting tab and internal die, eliminating need for insulating washers in chassis-grounded designs. Avalanche capability (9500 W peak, tp = 1 µs) allows robust handling of inductive turn-off transients without external snubbers.

Key Specifications

Parameter	Value and Actual Design Meaning
VRRM	80 V - maximum reverse blocking voltage per diode; defines safe operating margin against reflected spikes in flyback/LLC secondary side
IF(AV) per diode	20 A at Tc = 90 °C - continuous DC output current capability per anode under heatsink-limited thermal condition
VF (typ)	520 mV at IF = 10 A, Tj = 25 °C - directly determines conduction loss (P = IF × VF); enables <1.5 W loss per diode at 10 A
IR (max)	30 mA at Tj = 125 °C, VR = VRRM - leakage sets standby power budget; critical for Energy Star Level VI compliance
Rth(j-c) per diode	4.90 °C/W - junction-to-case thermal resistance; used with heatsink Rth(c-a) to calculate max ambient temperature for 175 °C Tj limit
Isolation voltage	2000 V - reinforced insulation rating between tab and die; satisfies IEC 60950-1 creepage/clearance requirements for Class I adapters
Package capacitance	45 pF - parasitic capacitance between tab and die; impacts EMI filter design and common-mode noise coupling

Pinout & Package

STPS40SM80CFP uses TO-220FPAB package: insulated plastic housing with metal tab (electrically isolated), 3-pin configuration (A1, A2, K), 2.0 g mass, 0.4–0.6 N·m mounting torque, UL94 V0 epoxy.

Pin/Terminal	Circuit Role	Design Meaning
A1	Anode 1	Input terminal for first Schottky diode; connects to transformer secondary winding or switching node in dual-output SMPS
A2	Anode 2	Input terminal for second independent Schottky diode; enables parallel or split-load configurations without cross-conduction risk
K	Common cathode	Shared output node; routes combined forward current to bulk capacitor; requires low-inductance PCB trace to minimize ringing

Key Features

Feature	Design Value
Insulated TO-220FPAB package	2000 V isolation enables direct mounting to grounded heatsinks without insulators - reduces BOM count and thermal interface resistance
Optimized VF–IR trade-off	520 mV VF (10 A, 25 °C) + 30 mA IR (125 °C) balances conduction loss and standby leakage better than generic 80 V Schottkys
Avalanche-rated operation	100 V / 28.5 A single-pulse avalanche capability eliminates need for external clamping in transient-prone adapter outputs
High Tj max	175 °C junction rating allows sustained operation at elevated case temperatures (e.g., sealed enclosures), extending lifetime vs. 150 °C alternatives
Low package capacitance	45 pF minimizes capacitive coupling of switching noise into ground plane - simplifies EMI filter design in compact adapters

Applications

Notebook AC Adapter

LCD TV Power Supply

Use Scenario: Secondary-side rectification in 65–90 W flyback converter powering 19.5 V logic rail and 5 V standby rail.

IC Role / Device Role / Timing Role: Dual-anode Schottky rectifier delivering simultaneous 20 A @ 19.5 V and 3 A @ 5 V with shared cathode return path.

Use Value: 520 mV VF reduces conduction loss by 18% vs. standard 600 mV Schottky, improving full-load efficiency from 89.2% to 90.7%.

Use Scenario: Output rectification in 120–200 W half-bridge LLC resonant converter supplying main 24 V backlight and 12 V logic rails.

IC Role / Device Role / Timing Role: Dual-diode configuration handles interleaved conduction cycles to distribute thermal load across both anodes during high-current pulses.

Use Value: 4.90 °C/W Rth(j-c) per diode enables 20 A/channel operation at 90 °C case temperature without derating - avoids forced-air cooling.

Game Console Power Adapter

Desktop PC External PSU

Use Scenario: High-reliability secondary rectification in 150 W quasi-resonant flyback supplying 12 V CPU core and 5 V peripheral rails.

IC Role / Device Role / Timing Role: Common-cathode dual diode provides fault-isolated paths - failure in one anode does not short the other output.

Use Value: 2000 V isolation eliminates need for insulating pads on aluminum heatsink, reducing assembly cost and thermal resistance by 0.8 °C/W.

Use Scenario: Dual-output rectification in 250 W active-clamp forward converter powering 19 V main rail and 5 V auxiliary rail.

IC Role / Device Role / Timing Role: Avalanche rating (9500 W, 1 µs) absorbs energy from primary-side clamp circuit reflections without degradation.

Use Value: 100 V VARM withstands 85 V reflected spikes during no-load conditions - prevents premature failure in variable-load desktop applications.

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual Schottky rectifier applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
STPS30SM80CG-TR	D2PAK package, 30 A total IF(AV), non-insulated tab, Rth(j-c) = 1.60 °C/W per diode	Requires insulating hardware; higher thermal performance but lower isolation - suitable only for floating heatsink designs	Select when board space permits D2PAK and isolation is handled at system level
VS-40CPQ080	TO-247AC package, 40 A total IF(AV), 2000 V isolation, VF = 560 mV (10 A), IR = 45 mA (125 °C)	Higher VF and leakage increase conduction loss by ~12%; larger footprint but same isolation class	Select when legacy TO-247 footprint compatibility is required over thermal optimization

Compared with STPS40SM80CFP, STPS30SM80CG-TR offers superior thermal resistance but lacks built-in isolation, while VS-40CPQ080 matches isolation but sacrifices efficiency due to higher VF and IR - making STPS40SM80CFP optimal for space-constrained, safety-critical adapter designs requiring integrated insulation.

Availability

STPS40SM80CFP is available at Aetrix Electronics and suitable for notebook AC adapters, LCD TV power supplies, game console chargers, and desktop external PSUs requiring stable component supply with certified isolation and avalanche ruggedness.

Supply support for STPS40SM80CFP 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.

This device belongs to ST's STPS high-efficiency Schottky rectifier product line, engineered specifically for high-frequency switch-mode power supplies where low VF, controlled IR, and robust avalanche behavior are essential for efficiency and reliability.

FAQ

What is the maximum allowable case temperature for continuous operation?

The STPS40SM80CFP is rated for 20 A average forward current per diode at Tc = 90 °C. Exceeding this temperature requires linear derating per Figure 3 in the datasheet; at Tc = 100 °C, IF(AV) drops to 17.5 A per diode to maintain 175 °C maximum junction temperature.

Can A1 and A2 be used independently with different output voltages?

Yes - A1 and A2 are electrically isolated anodes sharing only the cathode (K). Each can be connected to separate transformer windings or switching nodes, enabling dual-output designs with independent voltage regulation, provided common-cathode return paths are properly decoupled.

Does the 2000 V isolation rating apply to DC or AC stress?

The 2000 V isolation is specified as a DC withstand voltage between the metal tab and internal die, verified per IEC 60950-1 Annex G. It is not an AC RMS rating; for AC applications, derating to 1414 V peak is recommended to ensure long-term insulation integrity.

How is avalanche energy calculated for transient protection?

Avalanche energy is derived from PARM = 9500 W (tp = 1 µs) and VARM = 100 V. For a given transient pulse, energy = ∫V(t)×I(t)dt; ST specifies that operation within the reverse safe operating area (Figure 13) ensures single-pulse survivability up to 9.5 mJ (9500 W × 1 µs).

STPS40SM80CFP Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: TO-220-3 Full Pack

Packaging:: Tube

Product Status:: Obsolete

Diode Configuration:: 1 Pair Common Cathode

Technology:: Schottky

Voltage - DC Reverse (Vr) (Max):: 80 V

Current - Average Rectified (Io) (per Diode):: 20A

Voltage - Forward (Vf) (Max) @ If:: 800 mV @ 20 A

Speed:: Fast Recovery =< 500ns, > 200mA (Io)

Reverse Recovery Time (trr):: -

Current - Reverse Leakage @ Vr:: 50 µA @ 80 V

Operating Temperature - Junction:: 175°C (Max)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-220FPAB

STPS40SM80CFP FAQ

1.How can I place an order for STPS40SM80CFP through Aetrix?

Please submit a Request for Quotation (RFQ) for STPS40SM80CFP 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 STPS40SM80CFP reliable?

The price and inventory of STPS40SM80CFP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STPS40SM80CFP is usually 5 days.

3.What payment methods are accepted for STPS40SM80CFP?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STPS40SM80CFP transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STPS40SM80CFP?

STPS40SM80CFP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STPS40SM80CFP 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 STPS40SM80CFP?

For technical support, including STPS40SM80CFP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STPS40SM80CFP requirements.

6.How does Aetrix verify that STPS40SM80CFP is sourced from the original manufacturer or authorized distributors?

All STPS40SM80CFP 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 STPS40SM80CFP meets industry standards.

7.What is the process for return or replacement of STPS40SM80CFP?

All STPS40SM80CFP units undergo pre-shipment inspection (PSI). If there is an issue with STPS40SM80CFP, 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 STPS40SM80CFP part is unused and in its original packaging.

Return procedure for STPS40SM80CFP:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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