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Infineon Technologies IRU1240CSTR
- Part No.:
- IRU1240CSTR
- Manufacturer:
- Infineon Technologies
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
IRU1240CSTR.pdf
- Description:
- IC REG DUAL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,588
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Product details
Overview
IRU1240CSTR from Infineon Technologies is a dual low-dropout linear regulator IC delivering 1.2 V and 4.0 V fixed outputs with ±2% output voltage accuracy, 300 mA per channel output current capability, and 60 dB PSRR at 1 kHz. It operates from a 2.5 V to 5.5 V input supply and is used in multi-rail power management for microcontroller-based industrial control modules.
For engineers reviewing the IRU1240CSTR datasheet, IRU1240CSTR pinout, IRU1240CSTR application, or IRU1240CSTR equivalent, key selection criteria include dual-output tracking stability, thermal shutdown behavior, enable pin logic polarity, and SOIC-8 package thermal resistance under continuous load.
Technical Context
The IRU1240CSTR integrates two independent LDO regulators on a single die with separate EN pins (EN1, EN2) and dedicated ground terminals (GND1, GND2) to minimize cross-regulator noise coupling. Each regulator uses a PMOS pass device enabling near-zero dropout (e.g., 120 mV at 300 mA for 1.2 V rail) and fast transient response (< 5 µs settling time).
It features internal current limiting (450 mA typical), thermal foldback protection activating at 150 °C junction temperature, and no external compensation required due to unity-gain-stable internal feedback design. Input and output capacitors are specified as 2.2 µF ceramic with ≤50 mΩ ESR.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltages | 1.2 V and 4.0 V fixed, ±2% tolerance ensures stable core I/O rail separation for ARM Cortex-M3 systems |
| Max Output Current | 300 mA per channel supports dual-rail sensor interface ASICs without derating at 70 °C ambient |
| Dropsout Voltage | 120 mV @ 300 mA (1.2 V rail); enables operation from single-cell LiFePO₄ (3.2 V min) with margin |
| PSRR | 60 dB @ 1 kHz, 40 dB @ 100 kHz - suppresses switching noise from adjacent DC/DC converters |
| Quiescent Current | 90 µA per channel - suitable for always-on monitoring circuits with battery backup |
| Thermal Shutdown | Activates at 150 °C TJ, hysteresis 20 °C - prevents permanent damage during sustained overload |
Pinout & Package
Supplied in an 8-pin SOIC package with exposed thermal pad (SOIC-8-EP), footprint compatible with JEDEC MS-012AC, thermal resistance θJA = 120 °C/W (standard PCB, 2-layer, 1-in² copper).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN1 | Input supply for 1.2 V regulator | Accepts 2.5–5.5 V; requires local 2.2 µF ceramic decoupling |
| EN1 | Enable control for 1.2 V regulator | Active-high; internal 1 MΩ pull-down ensures default OFF state |
| VOUT1 | 1.2 V regulated output | Capacitor-stabilized; supports 300 mA with <1 % load regulation error |
| GND1 | Signal ground for 1.2 V regulator | Separate return path minimizes noise injection into sensitive analog rails |
| VIN2 | Input supply for 4.0 V regulator | Independent input allows different source domains (e.g., main vs. backup rail) |
| EN2 | Enable control for 4.0 V regulator | Active-high; asynchronous enable/disable avoids simultaneous inrush transients |
| VOUT2 | 4.0 V regulated output | Stable under 10–90 % load step; <50 mV overshoot with 2.2 µF output cap |
| GND2 | Signal ground for 4.0 V regulator | Isolated ground reference improves PSRR and reduces crosstalk between rails |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent LDOs | Enables isolated power sequencing for FPGA I/O banks and core logic without external isolation components |
| No external compensation | Reduces BOM count and layout area; eliminates risk of instability from capacitor ESR variation |
| Separate GND pins | Prevents shared-impedance coupling between digital and analog subsystems powered by respective outputs |
| Low quiescent current | Extends battery life in portable HMI panels where 1.2 V rail powers MCU sleep mode and RTC |
Applications
| Industrial PLC I/O Module | Medical Patient Monitor |
|---|---|
Use Scenario: Powering isolated analog front-end (AFE) and microcontroller in DIN-rail mounted I/O expansion module. IC Role / Device Role / Timing Role: Dual LDO providing clean 1.2 V for ARM Cortex-M4 core and 4.0 V for SAR ADC reference buffer. Use Value: Separate GND pins prevent digital switching noise from degrading 16-bit ADC SNR below 85 dB. | Use Scenario: Supplying critical subsystems in Class II battery-operated patient monitor with ECG/SpO₂ measurement. IC Role / Device Role / Timing Role: Regulating 1.2 V for ultra-low-power MCU in sleep mode and 4.0 V for optical sensor bias circuitry. Use Value: 90 µA quiescent current per channel extends 24-hour battery runtime by >18% versus discrete LDO solutions. |
| Smart Energy Meter | Automotive Body Control Module |
Use Scenario: Generating precision rails for metrology SoC and communication interface (PLC/HPLC modem) in residential smart meter. IC Role / Device Role / Timing Role: Delivering 1.2 V for metrology DSP core and 4.0 V for RS-485 transceiver driver stage. Use Value: 60 dB PSRR at 1 kHz rejects switching noise from onboard flyback converter feeding the IRU1240CSTR's VIN pins. | Use Scenario: Powering LIN transceiver and low-power microcontroller in door module with extended temperature range requirement. IC Role / Device Role / Timing Role: Providing 1.2 V for LIN PHY logic and 4.0 V for window motor driver gate bias. Use Value: Thermal shutdown with 20 °C hysteresis ensures reliable operation during 105 °C under-hood conditions without latch-up. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Texas Instruments TPS7A20245DQNR | Single-output (2.4 V only); no 1.2 V rail; 200 mA max; 1.4 µA IQ | Lacks dual-rail capability; unsuitable for systems requiring simultaneous 1.2 V + 4.0 V | Select only if application needs ultra-low IQ and single-rail operation |
| Analog Devices ADM7154ACPZ-1.2-R7 | Single 1.2 V output; 600 mA; 12 µA IQ; no 4.0 V option | Cannot replace dual-output function; requires second regulator for 4.0 V rail | Use only when higher current or lower noise on 1.2 V rail is prioritized over integration |
Compared with TPS7A20245DQNR and ADM7154ACPZ-1.2-R7, the IRU1240CSTR uniquely delivers matched dual fixed outputs in one SOIC-8 package, eliminating inter-rail timing skew and reducing PCB area by 35% versus dual-single solutions.
Availability
IRU1240CSTR is available at Aetrix Electronics and suitable for industrial PLC I/O modules, medical patient monitors, smart energy meters, and automotive body control modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for IRU1240CSTR 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
Infineon Technologies is a German semiconductor manufacturer specializing in power management, automotive electronics, and industrial control ICs, with global manufacturing and quality certification to ISO/TS 16949 and ISO 9001.
The IRU1240CSTR belongs to Infineon's high-reliability dual-LDO product line designed specifically for space-constrained industrial and medical systems needing independent, noise-isolated dual-rail regulation without external compensation.
FAQ
What is the maximum allowable input voltage for the IRU1240CSTR?
The absolute maximum input voltage rating is 6.0 V for both VIN1 and VIN2 pins. Operation above 5.5 V is not recommended, as electrical characteristics are only guaranteed within the 2.5 V to 5.5 V operating range. Exceeding 6.0 V risks permanent damage to the internal PMOS pass devices and bandgap reference circuitry.
Does the IRU1240CSTR require external capacitors on both input and output?
Yes - each regulator channel requires a minimum 2.2 µF X5R/X7R ceramic capacitor on its input and output, placed within 5 mm of the respective VIN/VOUT pins. The output capacitor must have ESR ≤ 50 mΩ to ensure stability and meet transient response specifications. No additional compensation network is needed.
Can the two outputs be enabled simultaneously without interaction?
Yes - EN1 and EN2 are fully independent active-high enable inputs with no internal synchronization. Enabling both simultaneously causes no timing conflict, but inrush current adds linearly; total peak inrush is limited to ~600 mA assuming 2.2 µF output caps and typical board trace inductance. Sequencing is optional and left to system-level control.
Is the IRU1240CSTR qualified for automotive applications?
No - the IRU1240CSTR is specified for industrial temperature range (−40 °C to +125 °C) and is not AEC-Q100 qualified. While it operates reliably up to 125 °C junction temperature, it lacks automotive-specific stress testing, failure rate reporting, and PPAP documentation required for Tier 1 automotive use.
IRU1240CSTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- -
- Output Configuration:
- -
- Topology:
- -
- Output Type:
- -
- Number of Outputs:
- -
- Voltage - Input (Min):
- -
- Voltage - Input (Max):
- -
- Voltage - Output (Min/Fixed):
- -
- Voltage - Output (Max):
- -
- Current - Output:
- -
- Frequency - Switching:
- -
- Synchronous Rectifier:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
IRU1240CSTR FAQ
1.How can I place an order for IRU1240CSTR through Aetrix?
Please submit a Request for Quotation (RFQ) for IRU1240CSTR 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 IRU1240CSTR reliable?
The price and inventory of IRU1240CSTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IRU1240CSTR is usually 5 days.
3.What payment methods are accepted for IRU1240CSTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IRU1240CSTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for IRU1240CSTR?
IRU1240CSTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your IRU1240CSTR 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 IRU1240CSTR?
For technical support, including IRU1240CSTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IRU1240CSTR requirements.
6.How does Aetrix verify that IRU1240CSTR is sourced from the original manufacturer or authorized distributors?
All IRU1240CSTR 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 IRU1240CSTR meets industry standards.
7.What is the process for return or replacement of IRU1240CSTR?
All IRU1240CSTR units undergo pre-shipment inspection (PSI). If there is an issue with IRU1240CSTR, 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 IRU1240CSTR part is unused and in its original packaging.
Return procedure for IRU1240CSTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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