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

STMicroelectronics STPS640CBY-TR

Name: STPS640CBY-TR
Brand: STMicroelectronics
SKU: STPS640CBY-TR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STPS640CBY-TR

Manufacturer:: STMicroelectronics

Category:: Diode Arrays

Package:: TO-252-3, DPAK (2 Leads + Tab), SC-63

Datasheet:: STPS640CBY-TR.pdf

Description:: DIODE ARRAY SCHOTTKY 40V 3A DPAK

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Product details

Overview

STPS640CBY-TR from STMicroelectronics is a dual automotive-grade Schottky rectifier in DPAK package, rated for 40 V reverse voltage and 2 × 3 A average forward current per diode, with typical forward voltage of 0.50 V at 125 °C and 3 A. It delivers negligible switching losses and low thermal resistance (5.5 °C/W per diode), optimized for high-frequency free-wheeling and polarity protection in automotive power converters.

For engineers reviewing the STPS640CBY-TR datasheet, STPS640CBY-TR pinout, STPS640CBY-TR application, or STPS640CBY-TR equivalent, key selection criteria include AEC-Q101 qualification, dual-diode thermal coupling behavior, junction-to-case thermal resistance, and conduction loss modeling using P = 0.42 × IF(AV) + 0.050 × IF²(RMS).

Technical Context

This device integrates two independent Schottky diodes in a single DPAK thermally coupled package, enabling shared heatsinking while maintaining electrical isolation between anodes and cathodes. Its ultra-fast switching and low VF minimize conduction and recovery losses in SMPS operating above 100 kHz.

The dual configuration supports symmetrical current sharing in bridge-leg freewheeling paths and bidirectional polarity protection circuits. Thermal derating is governed by coupled junction-to-case resistance (Rth(j-c) = 5.5 °C/W per diode, Rth(c) = 0.5 °C/W inter-diode coupling), requiring joint thermal analysis when both diodes conduct simultaneously.

Key Specifications

Parameter	Value and Actual Design Meaning
VRRM	40 V - Maximum repetitive reverse voltage before avalanche breakdown; defines safe blocking capability in 12 V/24 V automotive systems.
IF(AV) per diode	3 A - Continuous DC forward current rating per diode at Tc = 135 °C; supports sustained 6 A total device output with proper heatsinking.
VF (Typ)	0.50 V @ 3 A, 125 °C - Low forward drop directly reduces conduction loss (P ≈ 1.5 W per diode), critical for thermal budget in compact modules.
Rth(j-c) per diode	5.5 °C/W - Junction-to-case thermal resistance determines minimum heatsink requirement; enables >2.7 W dissipation per diode before exceeding 150 °C junction limit.
AEC-Q101	Qualified - Validated for automotive temperature cycling, humidity, and mechanical stress; required for under-hood power conversion applications.
IFSM	75 A @ 10 ms - Surge current rating defines short-circuit robustness during load dump or inductive kick events in vehicle electrical systems.

Pinout & Package

DPAK (TO-252) surface-mount package with exposed thermal pad on underside; dimensions per ST DocID025068 Rev 2: L2 = 0.80 mm typ., H = 9.35–10.10 mm, E = 6.40–6.60 mm, B2 = 5.20–5.40 mm. Lead-free, RoHS-compliant, UL94 V0 epoxy.

Pin/Terminal	Circuit Role	Design Meaning
A1	Anode 1	Input terminal for first Schottky diode; electrically isolated from A2 and K; connects to high-side switch node in freewheeling path.
A2	Anode 2	Input terminal for second Schottky diode; independent of A1 and K; enables dual-channel operation without cross-conduction risk.
K	Cathode (common)	Shared cathode connection for both diodes; serves as low-impedance return path and primary thermal interface to PCB copper pour.

Key Features

Feature	Design Value
Low VF at high temperature	0.50 V typ. @ 125 °C, 3 A - Maintains efficiency in hot under-hood environments where silicon diodes degrade significantly.
Negligible switching losses	No minority-carrier storage - Enables >500 kHz operation without reverse recovery spikes or EMI penalties.
Thermally coupled dual die	Rth(c) = 0.5 °C/W inter-diode coupling - Allows accurate joint thermal modeling when both diodes share heatsink area on PCB.
AEC-Q101 qualified	Validated for automotive Grade 0 (−40 to +150 °C) - Meets reliability requirements for engine control units and body electronics.

Applications

Automotive Engine Control Unit (ECU) Power Stage

12 V Battery Backup Polarity Protection

Use Scenario: Freewheeling path in high-side N-channel MOSFET-driven solenoid drivers within ECU power distribution modules.

IC Role / Device Role / Timing Role: Dual Schottky rectifier provides simultaneous flyback current return for two independent actuator channels, minimizing voltage overshoot during turn-off.

Use Value: 0.50 V VF at 125 °C reduces conduction loss by ~40% vs. standard silicon diodes, lowering thermal stress on densely packed ECU PCBs.

Use Scenario: Reverse-polarity protection at 12 V battery input of infotainment head units and ADAS domain controllers.

IC Role / Device Role / Timing Role: Common-cathode dual diode enables redundant protection path with automatic current sharing if one anode fails open.

Use Value: AEC-Q101 qualification ensures long-term reliability under repeated cold-crank and load-dump transients per ISO 7637-2.

DC-DC Converter Output Rectification

On-Board Charger (OBC) Auxiliary Supply

Use Scenario: Synchronous rectifier replacement in 40 V input, 5–12 V output buck converters for vehicle lighting and HVAC control.

IC Role / Device Role / Timing Role: Dual-diode configuration allows interleaved phase operation or redundancy in multi-phase outputs.

Use Value: 5.5 °C/W Rth(j-c) enables direct mounting to 20 cm² copper pour, eliminating need for external heatsinks in space-constrained modules.

Use Scenario: Input rectification stage in auxiliary 12 V supply derived from OBC's high-voltage DC link (e.g., 400 V → 12 V via flyback).

IC Role / Device Role / Timing Role: Handles high-frequency reverse recovery demands of flyback transformer reset while surviving 75 A surge currents during startup.

Use Value: 75 A IFSM rating withstands inrush into bulk capacitors without degradation, extending service life beyond 10 years in EV charging infrastructure.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STPS640CGY-TR	Same die, but in D2PAK (TO-263) package with larger thermal pad (Rth(j-c) = 3.5 °C/W per diode); 0.5 g weight vs. 0.3 g.	Better thermal performance for >10 W total dissipation; requires larger PCB footprint and higher assembly cost.	Select when junction temperature must stay <125 °C under continuous 6 A load without forced air.
VB240A-E3/45	Single-diode 40 V / 4 A Schottky in SMA package; no dual configuration; VF = 0.55 V @ 3 A, 25 °C; not AEC-Q101 qualified.	Lacks dual-anode functionality and automotive qualification; suitable only for non-safety-critical consumer-grade 12 V supplies.	Use only in cost-sensitive, non-automotive designs where dual-channel operation and qualification are unnecessary.

Compared with STPS640CBY-TR, STPS640CGY-TR offers superior thermal handling at the expense of board area, while VB240A-E3/45 sacrifices automotive compliance and dual-diode integration for lower unit cost in non-qualified applications.

Availability

STPS640CBY-TR is available at Aetrix Electronics and suitable for automotive engine control units, battery backup systems, and DC-DC converter output stages requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for STPS640CBY-TR 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, sensors, and analog ICs for automotive, industrial, and consumer markets.

The STPS640C-Y series belongs to ST's automotive-qualified Schottky rectifier product line, engineered specifically for high-efficiency, high-reliability power conversion in harsh-temperature vehicle subsystems.

FAQ

What is the maximum junction temperature and how is it enforced?

The STPS640CBY-TR has a maximum operating junction temperature of +150 °C, verified per AEC-Q101 stress testing. This limit is enforced through thermal design: with Rth(j-c) = 5.5 °C/W per diode and 3 A average current, junction rise above case is ≤16.5 °C; case temperature must therefore remain ≤133.5 °C under full load to stay within spec.

Can both diodes be used simultaneously without thermal interaction?

Yes, but thermal interaction is intentional and quantified: inter-diode coupling resistance Rth(c) = 0.5 °C/W means heat generated in one diode raises the other's junction temperature by 0.5 °C per watt dissipated. Full thermal modeling must use ΔTj(diode1) = P1 × 5.5 + P2 × 0.5 to ensure neither exceeds 150 °C.

Is the common cathode internally bonded or externally accessible?

The cathode (K) is a single externally accessible terminal shared by both diodes, physically connected to the exposed thermal pad on the DPAK package underside. It is not internally split - both diodes share the same cathode metallization and thermal path to the PCB.

How does the 75 A IFSM rating translate to real-world surge handling?

The 75 A non-repetitive surge rating applies to 10 ms sinusoidal half-cycles at 25 °C case temperature. In practice, this supports survival of ISO 7637-2 Pulse 5a (load dump up to 60 V, 100 ms) when combined with appropriate TVS clamping and RC snubbing, provided peak instantaneous power stays below 1300 W (PARM).

STPS640CBY-TR Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: TO-252-3, DPAK (2 Leads + Tab), SC-63

Packaging:: Tape & Reel (TR)

Product Status:: Active

Diode Configuration:: 1 Pair Common Cathode

Technology:: Schottky

Voltage - DC Reverse (Vr) (Max):: 40 V

Current - Average Rectified (Io) (per Diode):: 3A

Voltage - Forward (Vf) (Max) @ If:: 630 mV @ 3 A

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

Reverse Recovery Time (trr):: -

Current - Reverse Leakage @ Vr:: 100 µA @ 40 V

Operating Temperature - Junction:: -40°C ~ 150°C

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: DPAK

STPS640CBY-TR FAQ

1.How can I place an order for STPS640CBY-TR through Aetrix?

Please submit a Request for Quotation (RFQ) for STPS640CBY-TR 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 STPS640CBY-TR reliable?

The price and inventory of STPS640CBY-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STPS640CBY-TR is usually 5 days.

3.What payment methods are accepted for STPS640CBY-TR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STPS640CBY-TR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STPS640CBY-TR?

STPS640CBY-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STPS640CBY-TR 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 STPS640CBY-TR?

For technical support, including STPS640CBY-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STPS640CBY-TR requirements.

6.How does Aetrix verify that STPS640CBY-TR is sourced from the original manufacturer or authorized distributors?

All STPS640CBY-TR 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 STPS640CBY-TR meets industry standards.

7.What is the process for return or replacement of STPS640CBY-TR?

All STPS640CBY-TR units undergo pre-shipment inspection (PSI). If there is an issue with STPS640CBY-TR, 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 STPS640CBY-TR part is unused and in its original packaging.

Return procedure for STPS640CBY-TR:

1.Submit a request within 90 days.

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

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