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STMicroelectronics STPS640CB-TR
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- Part No.:
- STPS640CB-TR
- Manufacturer:
- STMicroelectronics
- Category:
- Diode Arrays
- Package:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Datasheet:
-
STPS640CB-TR.pdf
- Description:
- DIODE ARRAY SCHOTTKY 40V 3A DPAK
- Quantity:
- Payment:
- Shipping:
Inventory:4,007
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Product details
Overview
STPS640CB-TR from STMicroelectronics is a dual common-cathode Schottky rectifier in DPAK package, rated for 40 V repetitive peak 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 - optimized for high-frequency free-wheeling and polarity protection in SMPS and DC-DC converters.
For engineers reviewing the STPS640CB-TR datasheet, STPS640CB-TR pinout, STPS640CB-TR application, or STPS640CB-TR equivalent, key selection criteria include low conduction loss (VF ≤ 0.57 V @ 125 °C/3 A), avalanche-rated 90 W peak power, thermal resistance of 5.5 °C/W (junction-to-case per diode), and DPAK footprint compatibility with high-power density board layouts.
Technical Context
This dual Schottky rectifier integrates two independent anodes sharing a common cathode terminal, enabling synchronous freewheeling or dual-path rectification in buck, flyback, and OR-ing configurations. Its low capacitance and negligible switching losses stem from metal–semiconductor junction design without minority-carrier storage.
Thermal coupling between diodes is quantified by Rth(c) = 0.5 °C/W, allowing accurate junction temperature estimation when both diodes conduct simultaneously: ΔTj(diode1) = P₁ × 5.5 + P₂ × 0.5. Maximum junction temperature is 150 °C, with derated avalanche capability down to Tj = 125 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 40 V - supports input/output rails up to 36 V DC with 10 % safety margin |
| IF(AV) per diode | 3 A - enables continuous 3 A load current per channel at TC = 135 °C |
| VF (typ) | 0.50 V @ 125 °C / 3 A - reduces conduction loss to ~1.5 W per diode at full load |
| Rth(j-c) per diode | 5.5 °C/W - allows ≥10 W dissipation per diode before reaching 150 °C junction limit |
| PARM | 90 W @ tp = 10 µs / Tj = 125 °C - sustains short-circuit or inductive kick energy without failure |
| IR @ 125 °C | ≤10 mA @ VR = 40 V - limits leakage-induced standby power in always-on systems |
Pinout & Package
DPAK (TO-252) package with exposed thermal pad on underside; mechanical outline conforms to ST's standard DPAK drawing (Ref. DocID3628 Rev 9, Fig. 9), requiring minimum 4.95 mm × 5.46 mm copper area under tab for optimal thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| K (Tab) | Common cathode | Electrically and thermally connected to PCB copper; must be soldered to ground plane or heatsink |
| A1 | Anode 1 | Input path for first Schottky diode; used for primary-side freewheeling or OR-ing leg 1 |
| A2 | Anode 2 | Input path for second Schottky diode; enables dual-input redundancy or interleaved converter phase |
Key Features
| Feature | Design Value |
|---|---|
| Low VF at high temperature | 0.50 V typ. @ 125 °C / 3 A - maintains efficiency in thermally constrained enclosures |
| Avalanche energy rating | 90 W peak @ 10 µs - protects against inductive turn-off transients in motor drives and solenoid controls |
| Thermal coupling control | Rth(c) = 0.5 °C/W - enables precise multi-diode thermal modeling for parallel operation |
| ECOPACK®2 compliance | Halogen-free, RoHS-compliant epoxy - meets industrial and automotive environmental mandates without derating |
Applications
| Server VRM Output Stage | Industrial DC-DC Converter |
|---|---|
Use Scenario: High-current, low-voltage output stage of 12 V → 1 V server VRM using multiphase buck topology. IC Role / Device Role / Timing Role: Dual-channel freewheeling diode replacing synchronous MOSFETs in cost-sensitive designs; common-cathode configuration simplifies layout and reduces trace inductance. Use Value: 0.50 V VF at 125 °C cuts conduction loss by >30 % vs. standard silicon diodes, directly improving 90 %+ efficiency targets. | Use Scenario: 24 V input to ±15 V dual-output isolated DC-DC module for PLC I/O modules. IC Role / Device Role / Timing Role: Polarity protection and output rectification on both positive and negative secondary windings. Use Value: Dual-diode integration eliminates two discrete packages, saving 12 mm² board area while maintaining <10 mA leakage at 85 °C ambient. |
| Automotive Body Control Module | Telecom Power Shelf |
Use Scenario: Reverse-polarity and load-dump protected 12 V supply rail in BCM powering window lifters and mirror controls. IC Role / Device Role / Timing Role: Common-cathode dual Schottky used for input polarity protection and inductive flyback clamping across multiple actuators. Use Value: Avalanche rating withstands ISO 7637-2 pulse 5a (110 V/100 ms), eliminating need for external TVS in compact modules. | Use Scenario: 48 V intermediate bus rectification feeding distributed point-of-load converters in telecom power shelf. IC Role / Device Role / Timing Role: Primary-side output rectifier in forward or active-clamp forward topology operating at 200–500 kHz. Use Value: Low capacitance (<100 pF) and fast recovery minimize EMI generation, easing EN 55032 Class B compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual Schottky rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SS54-E3/57T | Single diode, 40 V / 5 A, DO-214AC package, VF = 0.55 V @ 5 A / 25 °C | Requires two devices and larger board area; no thermal coupling benefit | Preferred only when DPAK mounting is unavailable or single-diode replacement is needed |
| MBR640CT | Dual common-cathode, 40 V / 6 A total, TO-220AB package, VF = 0.70 V @ 6 A / 25 °C | Larger footprint, higher VF increases conduction loss by ~25 % at 3 A/channel | Chosen when higher surge current (IFS M = 150 A) outweighs thermal and space constraints |
Compared with SS54-E3/57T and MBR640CT, STPS640CB-TR uniquely balances DPAK-mountable thermal performance (5.5 °C/W), low-temperature-stable VF, and integrated dual-channel topology - making it optimal for space-constrained, high-efficiency 3–6 A per rail applications where thermal coupling and layout simplicity matter.
Availability
STPS640CB-TR is available at Aetrix Electronics and suitable for server VRMs, industrial DC-DC converters, automotive body control modules, and telecom power shelves requiring stable component supply and long-term production continuity.
Supply support for STPS640CB-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, designing and manufacturing analog, microcontroller, power, and sensor solutions for industrial, automotive, and consumer markets.
The STPS series targets high-efficiency power conversion, with STPS640CB-TR specifically engineered for compact, thermally demanding Schottky rectification in medium-power SMPS and protection circuits.
FAQ
What is the maximum allowable case temperature for continuous operation?
The device is rated for IF(AV) = 3 A per diode at TC = 135 °C. Exceeding this case temperature requires derating per Figure 2 in the datasheet; sustained operation above 135 °C risks exceeding the 150 °C maximum junction temperature, especially under simultaneous conduction of both diodes.
Can STPS640CB-TR replace a single 3 A Schottky diode in a non-dual configuration?
Yes - one anode (A1 or A2) and the common cathode (K) can be used as a standalone 3 A Schottky rectifier. The unused anode must be left floating or tied to cathode via a small resistor; do not short unused anode to cathode, as it may cause localized heating during transient events.
Is the DPAK thermal pad electrically isolated?
No - the DPAK tab (K) is the common cathode and is electrically active. It must be connected to the system ground or output rail potential. Thermal interface material must be electrically insulating if mounted to a grounded heatsink, or use bare copper if the cathode net is at ground potential.
Does STPS640CB-TR meet AEC-Q101 for automotive use?
No - STPS640CB-TR is not AEC-Q101 qualified. While its 150 °C Tj rating and avalanche capability support harsh environments, ST offers the automotive-grade STPS640CBYTR variant (same electrical specs, AEC-Q101 qualified) for automotive body electronics requiring qualification evidence.
STPS640CB-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:
- 150°C (Max)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DPAK
STPS640CB-TR FAQ
1.How can I place an order for STPS640CB-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for STPS640CB-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 STPS640CB-TR reliable?
The price and inventory of STPS640CB-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STPS640CB-TR is usually 5 days.
3.What payment methods are accepted for STPS640CB-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STPS640CB-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STPS640CB-TR?
STPS640CB-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STPS640CB-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 STPS640CB-TR?
For technical support, including STPS640CB-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STPS640CB-TR requirements.
6.How does Aetrix verify that STPS640CB-TR is sourced from the original manufacturer or authorized distributors?
All STPS640CB-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 STPS640CB-TR meets industry standards.
7.What is the process for return or replacement of STPS640CB-TR?
All STPS640CB-TR units undergo pre-shipment inspection (PSI). If there is an issue with STPS640CB-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 STPS640CB-TR part is unused and in its original packaging.
Return procedure for STPS640CB-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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