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STMicroelectronics STPS40170CT
- Part No.:
- STPS40170CT
- Manufacturer:
- STMicroelectronics
- Category:
- Diode Arrays
- Package:
- TO-220-3
- Datasheet:
-
STPS40170CT.pdf
- Description:
- DIODE ARR SCHOTT 170V 20A TO-220
- Quantity:
- Payment:
- Shipping:
Inventory:4,982
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Product details
Overview
STPS40170CT from STMicroelectronics is a dual common-cathode Schottky rectifier in TO-220AB package, rated for 170 V repetitive peak reverse voltage and 2 × 20 A average forward current per diode at Tc = 150 °C, with typical forward voltage drop of 0.69 V at 125 °C and 20 A - optimized for high-frequency SMPS and telecom DC/DC converters.
For engineers reviewing the STPS40170CT datasheet, STPS40170CT pinout, STPS40170CT application, or STPS40170CT equivalent, key selection criteria include junction-to-case thermal resistance (1.20 °C/W per diode), avalanche power rating (1015 W at 10 µs), low leakage (<30 µA at 25 °C), ECOPACK®2 compliance, and dual-diode center-tab configuration for shared heatsinking.
Technical Context
This dual Schottky rectifier integrates two independent anodes sharing a common cathode terminal, enabling synchronous half-wave rectification or independent channel operation in bridge-derived topologies. Its low VF–IR trade-off and 175 °C maximum junction temperature support high-efficiency, thermally constrained power stages.
The device exhibits 0.85 °C/W total junction-to-case thermal resistance when both diodes operate simultaneously, leveraging coupling resistance (0.50 °C/W) to reduce effective thermal impedance - critical for sustained 40 A device-level conduction under forced-air or heatsink-cooled conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 170 V - supports input stages up to 120 VAC rectified or 48 V telecom bus with margin against transients |
| IF(AV) per diode | 20 A at Tc = 150 °C - enables compact heatsink design in high-duty-cycle SMPS |
| VF (typ.) | 0.69 V at 20 A, 125 °C - reduces conduction loss to ~13.8 W per diode at full load |
| Rth(j-c) per diode | 1.20 °C/W - allows ≤24 °C temperature rise per diode at 20 A continuous conduction |
| IR (max) | 30 mA at 125 °C, VR = VRRM - limits standby power loss in offline adapters |
| PARM | 1015 W at tp = 10 µs, Tj = 125 °C - withstands short-duration surge events without avalanche failure |
| Tj max | 175 °C - permits operation in sealed enclosures or high-ambient industrial environments |
Pinout & Package
TO-220AB package with center-tab cathode (pin 2), two isolated anodes (pins 1 and 3), and metal tab electrically connected to cathode - requires insulated mounting hardware when cathode is not at chassis ground.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode 1 | Independent input path for first rectification leg; electrically isolated from Pin 3 |
| Pin 2 (Tab) | Common Cathode | Shared output node and mechanical heatsink interface; must be electrically tied to system ground or return rail |
| Pin 3 | Anode 2 | Independent input path for second rectification leg; symmetrical to Pin 1 in ratings and layout |
Key Features
| Feature | Design Value |
|---|---|
| High junction temperature capability | 175 °C max Tj enables operation in sealed power supplies without derating at 105 °C ambient |
| Low thermal resistance | 1.20 °C/W per diode improves power density by reducing required heatsink mass by ~35% vs. comparable 2.0 °C/W parts |
| Avalanche-rated | 1015 W peak avalanche power at 10 µs allows safe clamping of inductive turn-off spikes in flyback snubbers |
| ECOPACK®2 compliant | Meets RoHS and halogen-free requirements without compromising thermal or electrical performance in TO-220AB |
Applications
| Telecom DC/DC Converters | Server PSU Secondary Side |
|---|---|
Use Scenario: 48 V input to 12 V/54 A output LLC resonant converter in telecom shelf power modules. IC Role / Device Role / Timing Role: Dual-anode Schottky rectifier providing synchronous secondary-side rectification with shared cathode return. Use Value: 0.69 V VF at 125 °C reduces conduction loss by 1.8 W per diode versus 0.85 V alternatives, improving full-load efficiency by 0.4%. |
Use Scenario: 12 V output stage in 2 kW redundant server power supply with parallel-phase interleaving. IC Role / Device Role / Timing Role: Common-cathode dual rectifier deployed across two interleaved phases to minimize PCB trace inductance and thermal gradient. Use Value: 1.20 °C/W Rth(j-c) per diode enables stable 20 A/channel operation on single 40 mm² copper pour without active cooling. |
| Industrial SMPS | LED Driver Power Stage |
Use Scenario: 300 W open-frame switch-mode power supply for PLC I/O modules operating at 60 °C ambient. IC Role / Device Role / Timing Role: Dual-center-tab rectifier used in voltage-doubler configuration for 24 V output with reduced ripple. Use Value: 175 °C Tj rating avoids thermal shutdown during 100% load at 70 °C case temperature, extending MTBF by >25%. |
Use Scenario: Constant-current LED driver for high-bay lighting with 36 V output and 10 A load. IC Role / Device Role / Timing Role: Dual-anode configuration supports split-input rectification to balance transformer secondary winding stress. Use Value: <30 µA IR at 125 °C prevents >100 mW standby loss in always-on drivers, meeting IEC 62301 Class D requirements. |
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-40CPH017 | Same 170 V VRRM and 2 × 20 A IF(AV), but TO-247 package; Rth(j-c) = 1.0 °C/W per diode; VF = 0.72 V (typ.) at 20 A, 125 °C | Higher thermal performance suits higher-power designs; larger footprint requires PCB redesign | Select when thermal budget is tighter than board space constraints and TO-247 mounting is acceptable |
| ON Semiconductor MBR40170CT | Identical TO-220AB package and pinout; VRRM = 170 V, IF(AV) = 2 × 20 A; VF = 0.75 V (typ.) at 20 A, 125 °C; Rth(j-c) = 1.35 °C/W per diode | Higher VF and thermal resistance increase conduction loss by ~1.2 W per diode at full load | Acceptable for cost-sensitive, lower-efficiency designs where 0.06 V VF penalty and 0.15 °C/W thermal penalty are tolerable |
Compared with VS-40CPH017, STPS40170CT offers better board-level compatibility in TO-220AB but trades 0.03 V higher VF and 0.15 °C/W higher thermal resistance; versus MBR40170CT, it delivers measurable efficiency and thermal advantage at identical footprint and mounting.
Availability
STPS40170CT is available at Aetrix Electronics and suitable for telecom DC/DC converters, industrial SMPS, and server PSU secondary-side rectification requiring stable component supply and long-term manufacturing continuity.
Supply support for STPS40170CT 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.
STPS40170CT belongs to ST's high-voltage Schottky rectifier product line, engineered specifically for high-frequency, high-efficiency AC/DC and DC/DC conversion in telecom and computing infrastructure.
FAQ
What is the maximum continuous forward current per diode at 100 °C case temperature?
At Tc = 100 °C, the STPS40170CT supports 2 × 25.5 A average forward current per diode (derated from 20 A at 150 °C using the curve in Figure 2). This is confirmed by the linear derating slope of –0.114 A/°C between 100 °C and 150 °C, yielding 25.5 A at 100 °C before reaching the 20 A limit at 150 °C.
Is the metal tab electrically isolated from the leads?
No - the metal tab is internally connected to Pin 2 (common cathode) and is not electrically isolated. It must be mounted with insulating hardware if the cathode node is not at chassis ground potential, as specified in ST's application note AN4021 and TO-220AB mechanical drawings.
Can STPS40170CT replace STPS30L170CG in D²PAK-based designs?
No - STPS30L170CG is a single-diode 30 A part in D²PAK, while STPS40170CT is a dual-diode 2 × 20 A part in TO-220AB. They differ in package, pin count, thermal profile, and circuit topology; direct replacement would require PCB redesign, thermal revalidation, and functional verification of dual-anode operation.
Does STPS40170CT support avalanche energy testing per JEDEC JESD24-11?
Yes - the datasheet specifies PARM = 1015 W at tp = 10 µs and Tj = 125 °C, which corresponds to 10.15 mJ single-pulse avalanche energy (E = P × t). This meets JEDEC JESD24-11 Class A requirements for power rectifiers and is validated in ST's internal qualification testing per DS4412 Rev 2.
STPS40170CT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- TO-220-3
- Packaging:
- Tube
- Product Status:
- Active
- Diode Configuration:
- 1 Pair Common Cathode
- Technology:
- Schottky
- Voltage - DC Reverse (Vr) (Max):
- 170 V
- Current - Average Rectified (Io) (per Diode):
- 20A
- Voltage - Forward (Vf) (Max) @ If:
- 920 mV @ 20 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 30 µA @ 170 V
- Operating Temperature - Junction:
- 175°C (Max)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220
STPS40170CT FAQ
1.How can I place an order for STPS40170CT through Aetrix?
Please submit a Request for Quotation (RFQ) for STPS40170CT 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 STPS40170CT reliable?
The price and inventory of STPS40170CT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STPS40170CT is usually 5 days.
3.What payment methods are accepted for STPS40170CT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STPS40170CT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STPS40170CT?
STPS40170CT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STPS40170CT 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 STPS40170CT?
For technical support, including STPS40170CT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STPS40170CT requirements.
6.How does Aetrix verify that STPS40170CT is sourced from the original manufacturer or authorized distributors?
All STPS40170CT 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 STPS40170CT meets industry standards.
7.What is the process for return or replacement of STPS40170CT?
All STPS40170CT units undergo pre-shipment inspection (PSI). If there is an issue with STPS40170CT, 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 STPS40170CT part is unused and in its original packaging.
Return procedure for STPS40170CT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
STPS40170CT Tags
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