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Diodes Incorporated STPR1240
- Part No.:
- STPR1240
- Manufacturer:
- Diodes Incorporated
- Category:
- Diode Arrays
- Package:
- TO-220-3
- Datasheet:
-
STPR1240.pdf
- Description:
- DIODE ARRAY GP 400V 6A TO220AB
- Quantity:
- Payment:
- Shipping:
Inventory:48
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Product details
Overview
STPR1240 from Diodes Incorporated is a 12A dual-leg super-fast rectifier in TO220AB (Type WX) package, rated for 400V peak reverse voltage, 1.3V forward voltage at 6A/25°C, 10μA reverse leakage at 400V/25°C, and 35ns reverse recovery time - deployed in high-frequency DC-DC converters and switched-mode power supplies.
For engineers reviewing the STPR1240 datasheet, STPR1240 pinout, STPR1240 application, or STPR1240 equivalent, key selection criteria include reverse recovery time under 35ns, thermal resistance junction-to-case of 4°C/W, dual-leg 6A-per-leg average current rating, and TO220AB mechanical compatibility with standard heatsinks.
Technical Context
This dual-cathode common-anode super-fast rectifier integrates two independent 6A legs sharing one anode terminal, enabling full-wave bridge configurations without external interconnects. Its glass-passivated die construction ensures stable operation up to +150°C junction temperature and supports repetitive surge currents up to 90A (8.3ms half-sine).
The device delivers low conduction loss via 1.30V VF at 6A/25°C and maintains tight leakage control (≤250μA at 400V/100°C), critical for efficiency-sensitive SMPS topologies operating above 100kHz switching frequencies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 400 V - Peak reverse blocking capability per leg, enabling use in 380VAC input rectification stages |
| IO (per leg) | 6 A - Continuous average forward current per diode leg, defining thermal design margin at TA = 25°C |
| tRR | 35 ns - Measured at IF = 0.5A, IR = 1.0A, IRR = 0.25A; enables >300kHz switching without excessive switching loss |
| VF @ 6A/25°C | 1.30 V - Directly determines conduction loss (7.8W per leg at 6A), impacting heatsink sizing |
| RθJC | 4 °C/W - Junction-to-case thermal resistance measured on 75×75×2mm copper heatsink; sets minimum thermal interface requirement |
| IR @ 400V/25°C | 10 μA - Low leakage preserves standby efficiency in offline PSUs and PFC front-ends |
Pinout & Package
Package: TO220AB (Type WX), molded plastic with matte tin-plated leads, UL 94V-0 rated, 1.927g mass. Anode (pin 1) is electrically common to both cathodes (pins 2 and 3).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (Tab) | Anode | Common anode connection; electrically tied to metal tab - requires isolation from heatsink unless referenced to system ground |
| Pin 2 | Cathode Leg 1 | Independent cathode output for first rectifier leg; used in center-tapped or dual-output configurations |
| Pin 3 | Cathode Leg 2 | Independent cathode output for second rectifier leg; enables synchronous or interleaved rectification layouts |
Key Features
| Feature | Design Value |
|---|---|
| Super-fast switching | 35ns tRR enables high-frequency operation (>200kHz) with minimal switching loss and EMI generation |
| Glass passivated die | Enhances humidity resistance and long-term reliability in industrial environments with thermal cycling |
| Lead-free & halogen-free | Meets RoHS 3 (2015/863/EU) and "Green" definition (<900ppm Br/Cl, <1000ppm Sb); compliant for automotive-tier supply chains |
| High surge rating | 90A IFSM (8.3ms) supports inrush current handling in AC-DC front-ends without derating |
Applications
| Server Power Supply | Industrial DC-DC Converter |
|---|---|
Use Scenario: Secondary-side synchronous rectification in 48V–12V isolated buck-derived converters for rack-mounted servers. IC Role / Device Role / Timing Role: Dual-leg super-fast rectifier replacing Schottky diodes to reduce conduction loss while maintaining fast turn-off. Use Value: 1.3V VF at 6A lowers heat generation by ~15% vs. 1.5V alternatives, easing thermal management in dense PCB layouts. | Use Scenario: Output rectification in 200–500kHz half-bridge DC-DC modules for PLC I/O power rails. IC Role / Device Role / Timing Role: High-current, low-leakage rectifier leg supporting continuous 6A load with <250μA IR at 100°C ambient. Use Value: 4°C/W RθJC allows direct mounting to chassis with minimal thermal interface, eliminating dedicated heatsinks. |
| Telecom Rectifier Module | LED Driver Power Stage |
Use Scenario: Input-stage full-wave rectification in 380VAC-fed telecom rectifier modules with active PFC. IC Role / Device Role / Timing Role: 400V VRRM-rated dual-leg rectifier handling 12A total output current in compact TO220AB footprint. Use Value: 35ns tRR minimizes reverse recovery charge (Qrr), reducing MOSFET stress and gate drive losses in high-frequency PFC stages. | Use Scenario: Constant-current output rectification in high-efficiency LED drivers for street lighting (100–200W). IC Role / Device Role / Timing Role: Low-VF, low-leakage rectifier leg delivering stable 6A DC to LED strings with minimal thermal drift. Use Value: 1.20V VF at 6A/125°C ensures consistent forward drop across operating temperature range, improving current regulation accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar super-fast rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STTH1204D | Same TO220AB package, 400V VRRM, but 12A single-leg rating (not dual-leg); tRR = 30ns, VF = 1.25V @ 12A/25°C | Requires external parallel configuration for dual-leg functionality; higher single-leg current capacity | Select when needing higher per-leg current or tighter tRR, but accept added layout complexity |
| GBU12J | 400V VRRM, 12A total bridge rating, integrated 4-diode GBU package; tRR = 50ns, VF = 1.1V @ 12A/25°C | Fixed bridge topology - no independent cathode access; lower VF but slower recovery | Select for space-constrained full-wave bridge designs where independent leg control is unnecessary |
Compared with STTH1204D and GBU12J, the STPR1240 uniquely provides dual independent cathodes in a single TO220AB outline - enabling flexible interleaving, redundancy, or split-rail outputs without board-level routing compromises.
Availability
STPR1240 is available at Aetrix Electronics and suitable for server power supplies, industrial DC-DC converters, telecom rectifier modules, and LED driver power stages requiring stable component supply and long-lifecycle support.
Supply support for STPR1240 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
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and North America.
The STPR series targets high-efficiency, high-reliability power conversion applications - specifically engineered for SMPS secondary-side rectification and high-frequency DC-DC topologies demanding fast recovery and low conduction loss.
FAQ
Is STPR1240 suitable for automotive applications?
No - STPR1240 is commercially qualified and not AEC-Q101 certified. While it operates from −55°C to +150°C and meets RoHS/Green requirements, Diodes explicitly states that automotive-grade variants require separate PPAP-capable qualification and IATF 16949 manufacturing - which this part does not carry.
What is the correct mounting orientation for thermal performance?
The metal tab (Pin 1/anode) must be mounted directly to a heatsink using thermally conductive insulating pads or bushings. Per datasheet Note 6, thermal testing assumes mounting on a 75mm × 75mm × 2mm copper heatsink - smaller or non-copper heatsinks will increase junction temperature beyond rated limits at full 12A load.
Can STPR1240 replace a standard 1N5408 in a linear power supply?
No - STPR1240 is optimized for high-frequency switching (tRR = 35ns), not 50/60Hz line-frequency rectification. Its 400V VRRM is sufficient, but its low VF and fast recovery offer no benefit at 50Hz, and its TO220AB package lacks the axial-lead form factor required for most linear PSU layouts.
Does STPR1240 have polarity markings on the package?
Yes - the top-view marking "STPR1240" is oriented with the anode (Pin 1/tab) on the left, Cathode Leg 1 (Pin 2) centered, and Cathode Leg 2 (Pin 3) on the right. The bottom-view diagram in DS43901 Rev. 2 confirms this pin-out configuration and shows polarity indicators adjacent to each terminal.
STPR1240 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-220-3
- Packaging:
- Tube
- Product Status:
- Active
- Diode Configuration:
- 1 Pair Common Cathode
- Technology:
- Standard
- Voltage - DC Reverse (Vr) (Max):
- 400 V
- Current - Average Rectified (Io) (per Diode):
- 6A
- Voltage - Forward (Vf) (Max) @ If:
- 1.3 V @ 6 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- 35 ns
- Current - Reverse Leakage @ Vr:
- 10 µA @ 400 V
- Operating Temperature - Junction:
- -55°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO220AB (Type WX)
STPR1240 FAQ
1.How can I place an order for STPR1240 through Aetrix?
Please submit a Request for Quotation (RFQ) for STPR1240 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 STPR1240 reliable?
The price and inventory of STPR1240 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STPR1240 is usually 5 days.
3.What payment methods are accepted for STPR1240?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STPR1240 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STPR1240?
STPR1240 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STPR1240 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 STPR1240?
For technical support, including STPR1240 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STPR1240 requirements.
6.How does Aetrix verify that STPR1240 is sourced from the original manufacturer or authorized distributors?
All STPR1240 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 STPR1240 meets industry standards.
7.What is the process for return or replacement of STPR1240?
All STPR1240 units undergo pre-shipment inspection (PSI). If there is an issue with STPR1240, 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 STPR1240 part is unused and in its original packaging.
Return procedure for STPR1240:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
STPR1240 Tags
-
BAV99-7-F
Diodes Incorporated
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BAT54C-7-F
Diodes Incorporated
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BAV99,215
Nexperia USA Inc.
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BAT54SLT1G
onsemi
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BAV70LT1G
onsemi
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BAT54CLT1G
onsemi
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BAT54S-7-F
Diodes Incorporated
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BAV99LT1G
onsemi
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BAT54S,215
Nexperia USA Inc.
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BAS40-04LT1G
onsemi
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MMBD1503-TP
Micro Commercial Co
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BAV99WT1G
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