My Inquiry
My Account
STMicroelectronics STPS1545CB-TR
;;2.jpg)
- Part No.:
- STPS1545CB-TR
- Manufacturer:
- STMicroelectronics
- Category:
- Diode Arrays
- Package:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Datasheet:
-
STPS1545CB-TR.pdf
- Description:
- DIODE ARRAY SCHOTT 45V 7.5A DPAK
- Quantity:
- Payment:
- Shipping:
Inventory:4,550
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
STPS1545CB-TR from STMicroelectronics is a dual center-tap Schottky rectifier optimized for high-frequency DC-DC converters and switch-mode power supplies, featuring 45 V reverse voltage rating, 2 × 7.5 A average forward current per diode, 0.5 V typical forward voltage at 7.5 A/125 °C, and D²PAK (TO-263) surface-mount package with ECOPACK®2 compliance.
For engineers reviewing the STPS1545CB-TR datasheet, STPS1545CB-TR pinout, STPS1545CB-TR application, or STPS1545CB-TR equivalent, key selection criteria include low conduction loss (P = 0.42 × IF(AV) + 0.020 × IF²(RMS)), avalanche-rated capability (190 W peak), thermal resistance (Rth(j-c) = 3.0 °C/W per diode), and suitability for low-voltage, high-efficiency rectification in compact power stages.
Technical Context
This dual-diode Schottky rectifier integrates two independent anode-cathode paths sharing a common cathode terminal (center-tap configuration), enabling synchronous or complementary rectification topologies. Its negligible switching losses and extremely fast recovery eliminate snubber requirements in >100 kHz converters.
Thermal design relies on direct case-to-heatsink conduction via the exposed metal slug; junction-to-case resistance is 3.0 °C/W per diode, and coupling resistance between diodes is –0.35 °C/W - critical for simultaneous conduction derating. Maximum junction temperature is rated at 175 °C with avalanche energy specified at 190 W (10 µs pulse, Tj = 125 °C).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 45 V - supports input/output rails up to 36 V nominal with 25 % safety margin against transients |
| IF(AV) per diode | 7.5 A - enables continuous 15 A total output in center-tap transformer configurations |
| VF (typ) | 0.5 V @ 7.5 A, 125 °C - reduces conduction loss to ~3.75 W per diode at full load |
| Rth(j-c) | 3.0 °C/W per diode - requires ≥25 cm² copper pour for ≤40 °C rise at 7.5 A |
| IFSM | 150 A (10 ms sine) - withstands startup surges and short-circuit foldback currents |
| PARM | 190 W (10 µs pulse, Tj = 125 °C) - provides robustness against inductive kickback in flyback or LLC resonant converters |
Pinout & Package
STPS1545CB-TR uses the D²PAK (TO-263) surface-mount package with an exposed metal thermal pad (cathode connection) and three terminals: two anodes (A1, A2) and one shared cathode (K). The package is designed for solder-reflow mounting with mechanical anchoring via the slug.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 | Anode 1 | Input path for first half of center-tapped winding; connects to transformer primary-side tap |
| A2 | Anode 2 | Input path for second half of center-tapped winding; enables push-pull or full-wave rectification |
| K | Common Cathode | Output node tied to ground or negative rail; serves as thermal and electrical reference point |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low VF | 0.5 V typ. @ 7.5 A/125 °C - cuts forward drop by ~30 % vs. standard Schottkys, improving efficiency in 5–12 V output stages |
| Avalanche-rated | 190 W peak power (10 µs) - eliminates need for external clamping in inductive switching circuits |
| Dual-diode integration | Center-tap topology in single D²PAK - saves PCB area vs. discrete dual-Schottky solution and ensures matched thermal behavior |
| ECOPACK®2 compliance | Halogen-free, RoHS-compliant epoxy - meets industrial and automotive environmental mandates without performance trade-off |
Applications
| Server VRM Power Stage | Laptop AC-DC Adapter |
|---|---|
Use Scenario: High-density 12 V → 1.2 V point-of-load conversion using center-tapped transformer and synchronous rectification. IC Role / Device Role / Timing Role: Dual Schottky rectifier providing low-loss, high-speed freewheeling and output rectification in multiphase buck-derived topologies. Use Value: 0.5 V VF minimizes conduction loss at 30–50 A total output, enabling >92 % efficiency at 50 % load with minimal heatsinking. | Use Scenario: Compact 19 V input, 5–20 V variable-output USB PD adapter with active clamp flyback. IC Role / Device Role / Timing Role: Secondary-side center-tap rectifier handling bidirectional current during ZVS transitions and leakage energy recovery. Use Value: Avalanche rating absorbs clamp capacitor discharge spikes, eliminating need for TVS diodes and reducing BOM count by one component. |
| Industrial PLC Power Supply | LED Driver for High-Bay Lighting |
Use Scenario: 24 V isolated DC-DC module powering I/O modules with strict thermal limits in enclosed enclosures. IC Role / Device Role / Timing Role: Primary rectifier in forward converter secondary, operating continuously at 70 °C ambient with forced air. Use Value: 175 °C max junction temperature and 3.0 °C/W Rth(j-c) allow stable operation with 20 cm² internal copper, avoiding fan dependency. | Use Scenario: Constant-current LED driver with 48 V bus and 36 V string voltage, using center-tapped transformer for isolation and ripple reduction. IC Role / Device Role / Timing Role: Output rectifier managing 3–5 A per channel in multi-string architecture with shared cathode return. Use Value: Matched VF across A1/A2 diodes ensures balanced current sharing (<5 % mismatch), preventing thermal runaway in parallel LED strings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual Schottky rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Vishay VS-15CTQ045PbF | Same 45 V VRRM, 2 × 7.5 A IF(AV), but TO-220AB package; Rth(j-c) = 2.5 °C/W (lower), VF = 0.52 V @ 7.5 A | Requires through-hole assembly and larger footprint; better thermal performance but no SMT compatibility | Select when board space allows through-hole mounting and higher thermal margin is prioritized over automation |
| ON Semiconductor MBR1545CT | 45 V VRRM, 2 × 7.5 A IF(AV), TO-220AB; VF = 0.62 V @ 7.5 A, no avalanche rating specified | Lacks PARM specification - unsuitable for inductive switching or flyback clamp recovery | Acceptable only in non-avalanche-sensitive applications like linear post-regulation or low-dV/dt SMPS |
Compared with VS-15CTQ045PbF and MBR1545CT, STPS1545CB-TR uniquely combines D²PAK SMT compatibility, guaranteed avalanche ruggedness, and lowest VF in its class - making it optimal for space-constrained, high-reliability DC-DC designs where thermal management and transient robustness are co-critical.
Availability
STPS1545CB-TR is available at Aetrix Electronics and suitable for server VRM power stages, laptop AC-DC adapters, and industrial PLC power supplies requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for STPS1545CB-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 analog, microcontroller, power, and sensor solutions for industrial, automotive, and consumer markets.
The STPS series targets high-efficiency power conversion, with STPS1545CB-TR specifically engineered for compact, high-frequency rectification in space- and thermal-constrained DC-DC applications.
FAQ
What is the maximum allowable PCB copper area for thermal management of STPS1545CB-TR?
Per Figure 8 in the datasheet, a minimum of 25 cm² of 35 µm copper on FR4 is required to achieve Rth(j-a) ≈ 40 °C/W at δ = 0.5 duty cycle. For continuous 7.5 A per diode at 70 °C ambient, ≥35 cm² is recommended to maintain Tj < 150 °C without forced airflow.
Can STPS1545CB-TR be used in place of a single-diode Schottky like STPS15H100CG?
No - STPS1545CB-TR is a dual-diode center-tap device with shared cathode (A1-K-A2), not a single 15 A diode. Substitution would require circuit redesign to accommodate the center-tap topology and verify transformer winding symmetry and current balance.
Is the D²PAK thermal pad electrically isolated from the cathode terminal?
Yes - the exposed metal slug in the D²PAK package is internally connected to the K (cathode) terminal. It must be soldered to a cathode-connected copper pour; using it as a floating thermal plane violates isolation and may cause short circuits.
Does STPS1545CB-TR support reflow soldering per JEDEC J-STD-020?
Yes - the D²PAK package is qualified for standard lead-free reflow profiles (peak 260 °C, 20–40 s above 217 °C). The datasheet specifies no special preheat or cooling ramp restrictions, and ECOPACK®2 compliance confirms halogen-free, RoHS-compliant materials compatible with standard SMT lines.
STPS1545CB-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:
- Obsolete
- Diode Configuration:
- 1 Pair Common Cathode
- Technology:
- Schottky
- Voltage - DC Reverse (Vr) (Max):
- 45 V
- Current - Average Rectified (Io) (per Diode):
- 7.5A
- Voltage - Forward (Vf) (Max) @ If:
- 570 mV @ 7.5 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 100 µA @ 45 V
- Operating Temperature - Junction:
- 175°C (Max)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DPAK
STPS1545CB-TR FAQ
1.How can I place an order for STPS1545CB-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for STPS1545CB-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 STPS1545CB-TR reliable?
The price and inventory of STPS1545CB-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STPS1545CB-TR is usually 5 days.
3.What payment methods are accepted for STPS1545CB-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STPS1545CB-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STPS1545CB-TR?
STPS1545CB-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STPS1545CB-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 STPS1545CB-TR?
For technical support, including STPS1545CB-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STPS1545CB-TR requirements.
6.How does Aetrix verify that STPS1545CB-TR is sourced from the original manufacturer or authorized distributors?
All STPS1545CB-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 STPS1545CB-TR meets industry standards.
7.What is the process for return or replacement of STPS1545CB-TR?
All STPS1545CB-TR units undergo pre-shipment inspection (PSI). If there is an issue with STPS1545CB-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 STPS1545CB-TR part is unused and in its original packaging.
Return procedure for STPS1545CB-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
STPS1545CB-TR Tags
-
BAV99-7-F
Diodes Incorporated
-
BAT54C-7-F
Diodes Incorporated
-
BAV99,215
Nexperia USA Inc.
-
BAT54SLT1G
onsemi
-
BAV70LT1G
onsemi
-
BAT54CLT1G
onsemi
-
BAT54S-7-F
Diodes Incorporated
-
BAV99LT1G
onsemi
-
BAT54S,215
Nexperia USA Inc.
-
BAS40-04LT1G
onsemi
-
MMBD1503-TP
Micro Commercial Co
-
BAV99WT1G
onsemi
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
