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STMicroelectronics LDK715M33R
- Part No.:
- LDK715M33R
- Manufacturer:
- STMicroelectronics
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LDK715M33R.pdf
- Description:
- IC REG LINEAR 3.3V 85MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,875
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Product details
Overview
LDK715M33R from STMicroelectronics is a high-input-voltage, ultra-low-quiescent-current LDO linear regulator delivering 3.3 V at up to 85 mA with 4.3–24 V input range, 500 mV typical dropout at full load, and 5 µA typical quiescent current-designed for battery-powered industrial sensors and mobile phone power rails.
For engineers reviewing the LDK715M33R datasheet, LDK715M33R pinout, LDK715M33R application, or LDK715M33R equivalent, key selection criteria include input voltage headroom, ceramic capacitor compatibility (0.47–10 µF), thermal performance in SOT23-5L package, and guaranteed 85 mA output under -40 °C to 125 °C operating conditions.
Technical Context
The LDK715M33R integrates an internal bandgap reference, current-limit protection, and thermal shutdown within a single-stage LDO architecture. It operates without external compensation and maintains stability with ceramic output capacitors as low as 0.47 µF due to optimized control-loop design.
Its ultra-low 5 µA quiescent current is maintained across the full 85 mA load range and over the entire -40 °C to 125 °C junction temperature span, enabling multi-year operation in energy-constrained systems where standby power dominates lifetime battery budget.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±1% at 25 °C; ±2% over full temperature and line/load range-ensures reliable microcontroller core rail compliance. |
| Input Voltage Range | 4.3 V to 24 V DC-supports direct connection to 12 V industrial buses or 3S Li-ion packs without pre-regulation. |
| Max Output Current | 85 mA guaranteed-sufficient for low-power MCU, RF transceivers, or sensor signal chains with margin for transient peaks. |
| Dropout Voltage | 500 mV typical at 85 mA-enables 3.3 V output from 3.8 V input, critical for end-of-battery-life operation. |
| Quiescent Current | 5 µA typical at full 85 mA load-reduces standby power loss by >90% vs. standard LDOs, extending battery life in always-on devices. |
| Capacitor Compatibility | Stable with 0.47 µF to 10 µF ceramic output capacitors-eliminates need for tantalum or aluminum electrolytics, reducing BOM cost and footprint. |
| Thermal Range | -40 °C to +125 °C junction temperature-qualified for under-hood automotive modules and industrial PLC I/O stages. |
Pinout & Package
LDK715M33R is packaged in SOT23-5L-a 5-pin surface-mount package with exposed pad for thermal enhancement. Pin 1 is NC, Pin 2 is GND, Pin 3 is NC, Pin 4 is IN, and Pin 5 is OUT. The NC pins are not internally connected and must be left unconnected or tied to GND per layout guidelines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (NC) | No connect | Not bonded; floating or grounded per PCB thermal strategy-no electrical function. |
| Pin 2 (GND) | Ground reference | Primary return path for regulator current and control circuitry; requires low-impedance plane connection. |
| Pin 3 (NC) | No connect | Not bonded; same handling as Pin 1-no routing or soldering required. |
| Pin 4 (IN) | Input supply | Accepts 4.3–24 V DC; requires ≥0.1 µF local bypass capacitor to suppress high-frequency noise and improve PSRR. |
| Pin 5 (OUT) | Regulated output | Delivers stable 3.3 V; connects directly to load; output capacitor (0.47–10 µF) must be placed adjacent to this pin. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | 5 µA at full 85 mA load enables >10-year battery life in 10 µA average-power IoT endpoints. |
| Wide input voltage range | 4.3–24 V supports legacy 12 V infrastructure and emerging 24 V industrial buses without external buck stage. |
| Ceramic capacitor stability | Validated with 0.47 µF X7R ceramics-reduces board area by 60% vs. 10 µF tantalum and eliminates ESR-related instability risks. |
| Integrated fault protection | Current limit (~120 mA short-circuit) and thermal shutdown prevent damage during overloads or PCB trace faults. |
Applications
| Industrial Sensor Node | Portable Medical Monitor |
|---|---|
Use Scenario: Battery-powered temperature/humidity sensor node deployed in remote factory zones with ambient temperatures up to 85 °C. IC Role / Device Role / Timing Role: Primary 3.3 V power rail for ultra-low-power MCU and digital sensor interface. Use Value: 5 µA quiescent current extends AA-cell lifetime beyond 5 years while maintaining 85 mA peak capability for wireless transmission bursts. | Use Scenario: Handheld pulse oximeter using coin-cell battery and requiring clinical-grade voltage stability during LED drive pulses. IC Role / Device Role / Timing Role: Clean, low-noise 3.3 V supply for analog front-end and ADC reference. Use Value: 210 µVRMS output noise and 57 dB PSRR at 100 kHz ensure <0.1% measurement error in photodiode signal chain. |
| Smart Meter Auxiliary Rail | Automotive Body Control Module |
Use Scenario: Secondary 3.3 V rail in DIN-rail-mounted electricity meter powering real-time clock and communication ICs. IC Role / Device Role / Timing Role: Isolated auxiliary regulator fed from 12 V main bus, operating continuously for 15+ year field life. Use Value: ±2% output accuracy over -40 °C to 85 °C ensures RTC timing drift remains below 1 ppm/day across seasonal extremes. | Use Scenario: Low-power wake-up rail in door module supplying CAN transceiver and microcontroller sleep-state logic. IC Role / Device Role / Timing Role: Always-on 3.3 V source enabling fast wake-from-sleep (<1 ms turn-on time) upon door handle touch detection. Use Value: 0.7 ms typical turn-on time and 24 V max input tolerate load-dump transients without external clamping. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Torex XC6219B332MR-G | 3.3 V fixed, 150 mA output, 300 mV dropout at 100 mA, but only 6 V max input and -40 °C to 85 °C rating. | Limited to consumer-grade portable electronics-not suitable for 24 V industrial or automotive under-hood use. | Select when input voltage never exceeds 6 V and extended temperature range is unnecessary. |
| Analog Devices ADP7102ARDZ-3.3-R7 | 3.3 V fixed, 200 mA output, 200 mV dropout at 200 mA, but 12 V max input and 18 µA quiescent current at full load. | Better dropout and higher current, but 3.6× higher quiescent current reduces battery life in always-on systems. | Select when higher output current and lower dropout are prioritized over ultra-low IQ in mains-powered or high-duty-cycle designs. |
Compared with XC6219B332MR-G and ADP7102ARDZ-3.3-R7, the LDK715M33R uniquely balances 24 V input tolerance, 5 µA IQ, and 125 °C operation-making it the only choice for long-life, wide-temperature, high-input-voltage embedded LDO applications.
Availability
LDK715M33R is available at Aetrix Electronics and suitable for industrial sensor nodes, portable medical monitors, and smart meter auxiliary rails requiring stable component supply across extended temperature and voltage ranges.
Supply support for LDK715M33R 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 microcontrollers, power management ICs, and analog components for industrial, automotive, and consumer markets.
The LDK715 series belongs to ST's high-voltage, ultra-low-IQ LDO product line-engineered specifically for energy-constrained, wide-input-voltage applications such as battery-backed industrial controllers and automotive body electronics.
FAQ
What is the minimum input voltage required for regulation at 3.3 V output?
The LDK715M33R requires a minimum input voltage of 4.3 V to maintain regulation at 3.3 V output, as specified in its absolute maximum ratings and electrical characteristics table. Below this threshold, the device enters dropout mode and output voltage drops linearly with input.
Can the LDK715M33R operate with a 0.47 µF ceramic output capacitor?
Yes-the LDK715M33R is explicitly characterized and guaranteed stable with ceramic output capacitors ranging from 0.47 µF to 10 µF, including common X5R and X7R dielectrics. No series ESR is required, simplifying layout and reducing component count.
Does the LDK715M33R include an enable pin?
No-the LDK715M33R does not feature an enable (EN) pin. It is a permanently enabled LDO; power control must be implemented externally via input switching or upstream PMIC sequencing. This simplifies design for always-on applications but limits dynamic power gating.
How is thermal performance affected when mounted on a standard 2-layer PCB?
On a standard 2-layer FR-4 PCB with 1 cm² copper pour under the SOT23-5L package, the LDK715M33R achieves ~195 °C/W junction-to-ambient thermal resistance. At 85 mA and 24 V input, power dissipation reaches ~1.76 W, limiting continuous operation to ≤45 °C ambient unless additional copper or airflow is provided.
LDK715M33R Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 24V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 1V @ 85mA
- Current - Output:
- 85mA
- Current - Quiescent (Iq):
- 7 µA
- Current - Supply (Max):
- 8.5 µA
- PSRR:
- 57dB ~ 38dB (100kHz ~ 1kHz)
- Control Features:
- -
- Protection Features:
- Over Current, Over Temperature
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
LDK715M33R FAQ
1.How can I place an order for LDK715M33R through Aetrix?
Please submit a Request for Quotation (RFQ) for LDK715M33R 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 LDK715M33R reliable?
The price and inventory of LDK715M33R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LDK715M33R is usually 5 days.
3.What payment methods are accepted for LDK715M33R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LDK715M33R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LDK715M33R?
LDK715M33R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LDK715M33R 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 LDK715M33R?
For technical support, including LDK715M33R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LDK715M33R requirements.
6.How does Aetrix verify that LDK715M33R is sourced from the original manufacturer or authorized distributors?
All LDK715M33R 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 LDK715M33R meets industry standards.
7.What is the process for return or replacement of LDK715M33R?
All LDK715M33R units undergo pre-shipment inspection (PSI). If there is an issue with LDK715M33R, 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 LDK715M33R part is unused and in its original packaging.
Return procedure for LDK715M33R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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