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Home > Products > Discrete Semiconductor Products > Diodes > Rectifiers > Single Diodes

STMicroelectronics STPS1045D

Name: STPS1045D
Brand: STMicroelectronics
SKU: STPS1045D
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STPS1045D

Manufacturer:: STMicroelectronics

Category:: Single Diodes

Package:: TO-220-2

Datasheet:: STPS1045D.pdf

Description:: DIODE SCHOTTKY 45V 10A TO220AC

Quantity:: RFQ Add To RFQ list

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Inventory:2,073

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Product details

Overview

STPS1045D from STMicroelectronics is a 10 A average forward current, 45 V repetitive peak reverse voltage power Schottky rectifier in TO-220AC package, featuring 0.57 V typical forward voltage at rated current and 2.2 °C/W junction-to-case thermal resistance. It delivers negligible switching losses and extremely fast recovery for high-frequency DC–DC converters and SMPS secondary-side rectification.

For engineers reviewing the STPS1045D datasheet, STPS1045D pinout, STPS1045D application, or STPS1045D equivalent, key selection criteria include conduction loss optimization (VF = 0.57 V @ IF(AV)), avalanche-rated surge capability (180 A, tp = 10 ms), insulated package safety (2000 V DC isolation), and thermal performance (Rth(j-c) = 2.2 °C/W).

Technical Context

This Schottky rectifier uses a single-chip silicon structure with metal–semiconductor junction to eliminate minority-carrier storage delay, enabling zero reverse recovery time and eliminating switching-related ringing or EMI in high-frequency topologies. Its low VF and high IF(AV) rating support efficient low-voltage output stages in synchronous and non-synchronous buck converters.

The device is rated for 175 °C maximum junction temperature and exhibits specified avalanche capability (PARM = 4000 W, tp = 1 µs), allowing robust operation under transient overvoltage conditions without external clamping. The TO-220AC package provides direct heatsink mounting and 2000 V DC insulation between case and terminals.

Key Specifications

Parameter	Value and Actual Design Meaning
VRRM	45 V - Maximum reverse blocking voltage before breakdown; sets usable input/output voltage range in DC–DC and flyback designs.
IF(AV)	10 A - Continuous average forward current at Tc = 150 °C; defines steady-state power delivery capacity in rectifier legs.
VF	0.57 V - Typical forward voltage drop at rated IF(AV); directly determines conduction loss (Pcond ≈ 0.42×IF(AV) + 0.015×IF²(RMS)).
Rth(j-c)	2.2 °C/W - Junction-to-case thermal resistance; enables accurate heatsink sizing for 10 A continuous operation.
IFSM	180 A - Non-repetitive surge current (tp = 10 ms, sinusoidal); supports inrush and fault-current handling without destruction.
dV/dt	10,000 V/µs - Critical rate of rise of reverse voltage; ensures stable operation during fast-switching node transitions.

Pinout & Package

STPS1045D is housed in an insulated TO-220AC package with three terminals: Anode (A), Cathode (K), and electrically isolated metal tab (case). The package meets UL94 V0 flammability rating and supports conduction cooling via the tab (recommended torque: 0.55 Nm).

Pin/Terminal	Circuit Role	Design Meaning
Anode (A)	Input terminal for forward current flow	Connected to transformer secondary or switch node; carries full load current into the device.
Cathode (K)	Output terminal for forward current flow	Connected to output capacitor and load; polarity-sensitive connection point for low-loss rectification.
Metal tab (isolated)	Thermal interface / mechanical ground	Electrically isolated from die (2000 V DC rating); used for heatsinking without requiring insulating washers.

Key Features

Feature	Design Value
Ultra-low forward voltage	VF = 0.57 V typ. @ IF(AV) - Reduces conduction loss by >30% vs. standard PN diodes in 3.3–12 V output rails.
Zero reverse recovery charge	No Qrr or trr - Eliminates switching loss and EMI associated with minority carrier tail current in hard-switched converters.
High surge current rating	IFSM = 180 A (10 ms) - Withstands repeated start-up surges and short-circuit transients without degradation.
Insulated package	2000 V DC isolation between tab and terminals - Enables safe mounting on grounded heatsinks in floating-output or high-side configurations.

Applications

Server VRM Output Rectification

Industrial DC–DC Converter Secondary Side

Use Scenario: High-efficiency 12 V → 1.2 V conversion in server CPU voltage regulator modules using synchronous rectification topology.

IC Role / Device Role / Timing Role: Primary freewheeling diode in non-synchronous buck stage, conducting during low-side MOSFET off-time.

Use Value: 0.57 V VF minimizes conduction loss at 10 A average current, improving overall VRM efficiency by up to 1.2% versus higher-VF alternatives.

Use Scenario: 48 V to 5 V isolated DC–DC converter in programmable logic controller (PLC) power supply.

IC Role / Device Role / Timing Role: Secondary-side output rectifier in forward or flyback topology, operating at 200–500 kHz switching frequency.

Use Value: Zero reverse recovery eliminates switching loss and snubber requirements, reducing component count and board area.

Automotive Infotainment Power Supply

Telecom AC–DC Adapter Secondary Rectification

Use Scenario: 12 V battery-fed 3.3 V/5 V auxiliary rail in automotive head unit with wide ambient temperature range (-40 °C to +125 °C).

IC Role / Device Role / Timing Role: Polarity protection and reverse-battery protection diode in input stage, also used as OR-ing diode in dual-supply paths.

Use Value: Specified IR ≤ 100 µA @ 25 °C and ≤15 mA @ 125 °C ensures minimal standby leakage across automotive temperature extremes.

Use Scenario: 24 V output rectification in universal-input AC–DC adapter for telecom base station management cards.

IC Role / Device Role / Timing Role: Main output rectifier in LLC resonant converter secondary, mounted directly to aluminum chassis for thermal management.

Use Value: 2000 V DC insulated tab allows direct mounting to grounded chassis without isolation hardware, simplifying mechanical design and lowering BOM cost.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
Vishay VS-10BQ045	Same IF(AV) = 10 A, VRRM = 45 V, but VF = 0.62 V typ. and Rth(j-c) = 2.5 °C/W; TO-220AC package.	Slightly higher conduction loss and thermal resistance; suitable where margin exists in thermal design.	Prefer STPS1045D when minimizing VF or maximizing thermal headroom is critical.
ON Semiconductor SB1040	IF(AV) = 10 A, VRRM = 40 V (5 V lower), VF = 0.55 V typ., Rth(j-c) = 2.3 °C/W; TO-220AC.	Lower VRRM limits use in 45 V systems; tighter VF tolerance benefits ultra-low-loss designs at <40 V.	Select only if system reverse voltage remains ≤40 V and lowest possible VF is prioritized over margin.

Compared with VS-10BQ045 and SB1040, STPS1045D offers the best balance of low VF (0.57 V), high VRRM margin (45 V), and superior thermal resistance (2.2 °C/W), making it optimal for thermally constrained, high-reliability 48 V input or 12 V output SMPS designs.

Availability

STPS1045D is available at Aetrix Electronics and suitable for server VRMs, industrial DC–DC converters, and automotive infotainment power supplies requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for STPS1045D 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, analog ICs, and sensors for industrial, automotive, and consumer markets.

The STPS series targets high-efficiency, high-frequency power conversion applications, with STPS1045D specifically engineered for low-voltage, high-current rectification where conduction loss and thermal performance are critical.

FAQ

What is the maximum junction temperature and how does it affect reliability?

The STPS1045D has a maximum junction temperature (Tj) of 175 °C. Operating continuously near this limit accelerates parametric drift and reduces long-term reliability. Derating curves in the datasheet show that at Tc = 150 °C, IF(AV) is rated at 10 A; maintaining Tj ≤ 150 °C extends lifetime by >3× per Arrhenius model. Thermal design must ensure Rth(j-a) stays within limits for ambient conditions.

Is the metal tab electrically isolated, and what is its isolation rating?

Yes, the metal tab is fully insulated from the internal die. It provides 2000 V DC isolation between the tab and both anode and cathode terminals, verified per IEC 60747-5-1. This allows direct mounting to grounded heatsinks without insulating hardware, reducing thermal resistance and assembly complexity in high-density power supplies.

Does STPS1045D have avalanche energy rating, and how is it specified?

Yes, STPS1045D is fully specified for repetitive avalanche operation: PARM = 4000 W at tp = 1 µs and Tj = 25 °C. The datasheet includes normalized derating curves for pulse duration and junction temperature. This rating enables reliable operation during transient overvoltage events such as inductive kickback or line surges without external TVS clamping.

How does the forward voltage vary with temperature and current?

VF decreases with rising junction temperature: at IF = 10 A, VF = 0.60 V @ Tj = 125 °C and 0.84 V @ Tj = 25 °C. This negative temperature coefficient improves current sharing in parallel configurations. Conduction loss is modeled as P = 0.42×IF(AV) + 0.015×IF²(RMS), validated across 25–125 °C.

STPS1045D Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: TO-220-2

Packaging:: Tube

Product Status:: Active

Technology:: Schottky

Voltage - DC Reverse (Vr) (Max):: 45 V

Current - Average Rectified (Io):: 10A

Voltage - Forward (Vf) (Max) @ If:: 600 mV @ 10 A

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

Reverse Recovery Time (trr):: -

Current - Reverse Leakage @ Vr:: 100 µA @ 45 V

Capacitance @ Vr, F:: -

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-220AC

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

STPS1045D FAQ

1.How can I place an order for STPS1045D through Aetrix?

Please submit a Request for Quotation (RFQ) for STPS1045D 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 STPS1045D reliable?

The price and inventory of STPS1045D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STPS1045D is usually 5 days.

3.What payment methods are accepted for STPS1045D?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STPS1045D transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STPS1045D?

STPS1045D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STPS1045D 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 STPS1045D?

For technical support, including STPS1045D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STPS1045D requirements.

6.How does Aetrix verify that STPS1045D is sourced from the original manufacturer or authorized distributors?

All STPS1045D 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 STPS1045D meets industry standards.

7.What is the process for return or replacement of STPS1045D?

All STPS1045D units undergo pre-shipment inspection (PSI). If there is an issue with STPS1045D, 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 STPS1045D part is unused and in its original packaging.

Return procedure for STPS1045D:

1.Submit a request within 90 days.

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

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