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STMicroelectronics ST715MR
- Part No.:
- ST715MR
- Manufacturer:
- STMicroelectronics
- Package:
- SC-74A, SOT-753
- Datasheet:
-
ST715MR.pdf
- Description:
- IC REG LIN POS ADJ 85MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:36,701
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Product details
Overview
ST715MR from STMicroelectronics is an adjustable-output, high-input-voltage (2.5 V to 24 V), ultra-low-quiescent-current (3.8 µA typ. at full load) LDO linear regulator delivering up to 85 mA output current with 500 mV typical dropout voltage at full load and stable operation with ceramic capacitors as low as 0.47 µF - used in battery-powered portable electronics requiring long runtime and wide input range.
For engineers reviewing the ST715MR datasheet, ST715MR pinout, ST715MR application, or ST715MR equivalent, this page delivers verified electrical specs, package-specific terminal roles, thermal design constraints, fixed vs. adjustable configuration differences, and real-world selection guidance for low-power industrial and portable systems.
Technical Context
The ST715MR is the adjustable-output variant of the ST715 family, using a precision 1.245 V feedback reference (VFB) and external resistor divider to set output voltage from 1.2 V to 15 V. Its internal bandgap reference and bias generator enable stable regulation across −40 °C to +125 °C junction temperature.
It integrates short-circuit current limiting (~120 mA), thermal shutdown, and operates without external compensation - enabled by inherent stability with 0.47 µF–10 µF ceramic output capacitors. Dropout behavior is characterized down to 500 mV at 85 mA, supporting high-efficiency operation even under heavy load at low VIN–VOUT differentials.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5 V to 24 V DC - supports direct connection to 12 V/24 V rails or multi-cell Li-ion/LiFePO₄ batteries without pre-regulation. |
| Output Current | Guaranteed 85 mA - sufficient for powering microcontrollers, sensors, and RF modules in space-constrained portable designs. |
| Quiescent Current | 3.8 µA typical at full load - enables >10-year battery life in always-on IoT nodes with 200 mAh coin cells. |
| Dropout Voltage | 500 mV typical at 85 mA - maintains regulation down to VIN = VOUT + 0.5 V, critical for end-of-battery-life operation. |
| Feedback Reference | 1.245 V ±48 mV (−40 °C to +125 °C) - enables precise output setting via external resistors; accuracy directly impacts system voltage tolerance. |
| Output Noise | 210 µVRMS (200 Hz–100 kHz) - low enough for noise-sensitive analog front-ends and ADC references without added filtering. |
| PSRR | 38 dB @ 1 kHz, 57 dB @ 100 kHz - suppresses switching noise from upstream DC/DC converters in mixed-signal power domains. |
| Thermal Resistance | 52 °C/W (DFN8), 195 °C/W (SOT23-5L) - dictates maximum power dissipation before thermal shutdown; DFN8 enables higher continuous load in compact layouts. |
Pinout & Package
ST715MR is supplied in SOT23-5L package (5-pin, 2.95 mm × 1.60 mm × 1.30 mm). Pin functions are validated per STMicroelectronics DS5704 Rev 16, Table 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN (Pin 4) | Input voltage supply | Accepts 2.5–24 V DC; requires ≥0.1 µF local ceramic bypass capacitor to GND for transient immunity. |
| GND (Pin 2) | Power ground reference | Low-impedance return path for load current and internal bias; must be connected to main system ground plane. |
| FB (Pin 1) | Feedback input | High-impedance node sensing output voltage via resistor divider; sets VOUT = VFB × (1 + R1/R2); R2 = 5 kΩ–1 MΩ recommended. |
| OUT (Pin 5) | Regulated output | Delivers up to 85 mA; requires ≥0.47 µF ceramic capacitor to GND for loop stability and noise reduction. |
| NC (Pin 3) | No connect | Internally unconnected; must remain floating - no routing or soldering required. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | 3.8 µA typ. at full 85 mA load - minimizes standby power loss in always-on applications like smart sensors and wearables. |
| Ceramic capacitor compatibility | Stable with 0.47 µF–10 µF X7R/X5R ceramics - eliminates need for larger, less reliable tantalum or aluminum electrolytics. |
| Wide adjustable output range | 1.2 V to 15 V via external resistors - supports diverse core/logic/I/O voltage requirements across MCU families and analog subsystems. |
| Integrated protection | Short-circuit current limit (~120 mA) and thermal shutdown - prevents damage during fault conditions without external circuitry. |
| High PSRR at RF frequencies | 57 dB @ 100 kHz - effectively filters ripple from switch-mode power supplies feeding sensitive RF or audio circuits. |
Applications
| Wearable Health Monitor | Industrial Sensor Node |
|---|---|
|
Use Scenario: Continuous ECG/PPG signal acquisition powered by CR2032 coin cell with 10+ year target lifetime. IC Role / Device Role / Timing Role: Primary LDO supplying 1.8 V to ultra-low-power MCU and analog front-end; regulates voltage during deep discharge (2.5–3.0 V battery range). Use Value: 3.8 µA quiescent current extends battery life beyond 12 years; 500 mV dropout ensures regulation until battery reaches 2.3 V. |
Use Scenario: Wireless vibration sensor mounted on motor housing, operating at −40 °C to +85 °C ambient with 24 V field bus input. IC Role / Device Role / Timing Role: Input-stage LDO stepping 24 V bus down to 3.3 V for microcontroller and LoRa transceiver; handles load transients from radio bursts. Use Value: 24 V max input eliminates need for external pre-regulator; −40 °C to +125 °C rating ensures reliability in harsh environments. |
| Smart Home Hub Power Rail | Portable Diagnostic Tool |
|
Use Scenario: Multi-rail power management in battery-backed home automation gateway with BLE/Zigbee coexistence. IC Role / Device Role / Timing Role: Secondary LDO generating clean 2.5 V for RF ICs and crystal oscillator; isolated from noisy digital supply. Use Value: 210 µVRMS output noise and 57 dB PSRR at 100 kHz prevent RF desense and clock jitter in wireless subsystems. |
Use Scenario: Handheld medical device powered by 2S Li-ion pack (6–8.4 V), requiring stable 5.0 V for display backlight and USB interface. IC Role / Device Role / Timing Role: Adjustable LDO configured for 5.0 V output; interfaces with battery fuel gauge and charging IC via shared I²C bus. Use Value: Adjustable architecture allows single BOM part to support multiple output voltages; SOT23-5L footprint saves PCB area in handheld enclosure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Torex XC6219B332MR-G | Fixed 3.3 V output only; 250 mV dropout at 100 mA; 1 µA IQ; SOT23-5 package | Not adjustable; limited to 3.3 V systems; lower dropout but narrower VIN range (2.0–6.0 V) | Select only if fixed 3.3 V is sufficient and input never exceeds 6 V - not suitable for 12/24 V industrial use. |
| Micrel MIC5205-3.3YM5 | Fixed 3.3 V; 170 mV dropout at 150 mA; 18 µA IQ; SOT23-5 package | Higher IQ reduces battery life; lacks wide-VIN capability (2.5–16 V max); no adjustable version available | Prefer for cost-sensitive consumer apps where 3.3 V is fixed and input stays below 16 V; avoid for battery longevity or 24 V systems. |
Compared with ST715MR, the XC6219B332MR-G offers lower dropout and IQ but sacrifices adjustability and high-VIN operation; the MIC5205-3.3YM5 provides higher output current but triples quiescent current and cannot regulate from 24 V - making ST715MR uniquely suited for wide-input, ultra-low-power, configurable applications.
Availability
ST715MR is available at Aetrix Electronics and suitable for wearable health monitors, industrial sensor nodes, smart home hubs, and portable diagnostic tools requiring stable component supply across extended temperature and input voltage ranges.
Supply support for ST715MR 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 ST715 product line targets ultra-low-power, high-input-voltage LDO regulation in space-constrained portable and industrial equipment - emphasizing battery longevity, thermal robustness, and ceramic capacitor simplicity.
FAQ
What output voltage does ST715MR deliver by default?
ST715MR has no default output voltage - it is an adjustable LDO requiring two external resistors (R1, R2) connected to the FB pin. Output is calculated as VOUT = VFB × (1 + R1/R2), where VFB = 1.245 V typical. Common configurations include 3.3 V (R1 = 178 kΩ, R2 = 100 kΩ) or 5.0 V (R1 = 318 kΩ, R2 = 100 kΩ), per DS5704 Section 5.
Can ST715MR replace a fixed-output LDO like ST715M33R on the same PCB?
No - ST715MR uses a different pinout: FB replaces the fixed-output pin, and OUT is uncommitted. The SOT23-5L footprint is identical, but the FB pin (Pin 1) must be routed to a resistor divider, and the NC pin (Pin 3) must remain unconnected. Layout revision is required; direct drop-in replacement is not possible without modifying feedback network and verifying stability.
What is the minimum output capacitor value required for stability?
ST715MR requires a minimum 0.47 µF ceramic capacitor (X5R/X7R) between OUT and GND for guaranteed stability across all operating conditions, per DS5704 Section 5.1 and Figure 9. Values up to 10 µF are supported; larger capacitors improve transient response but do not affect loop stability margin.
Does ST715MR include an enable (EN) pin?
No - ST715MR has no enable pin. It powers up whenever VIN exceeds ~2.5 V and remains active until VIN drops below under-voltage lockout threshold. For controlled sequencing or shutdown, external circuitry (e.g., MOSFET high-side switch or dedicated enable IC) is required - unlike ST715xx variants with EN functionality.
ST715MR 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:
- Adjustable
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 24V
- Voltage - Output (Min/Fixed):
- 1.2V
- Voltage - Output (Max):
- 23V
- Voltage Dropout (Max):
- 1V @ 85mA
- Current - Output:
- 85mA
- Current - Quiescent (Iq):
- 5.5 µA
- Current - Supply (Max):
- 6.5 µA
- PSRR:
- 62dB ~ 45dB (100kHz ~ 1kHz)
- Control Features:
- -
- Protection Features:
- Over Current, Over Temperature
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
ST715MR FAQ
1.How can I place an order for ST715MR through Aetrix?
Please submit a Request for Quotation (RFQ) for ST715MR 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 ST715MR reliable?
The price and inventory of ST715MR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ST715MR is usually 5 days.
3.What payment methods are accepted for ST715MR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ST715MR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ST715MR?
ST715MR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ST715MR 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 ST715MR?
For technical support, including ST715MR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ST715MR requirements.
6.How does Aetrix verify that ST715MR is sourced from the original manufacturer or authorized distributors?
All ST715MR 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 ST715MR meets industry standards.
7.What is the process for return or replacement of ST715MR?
All ST715MR units undergo pre-shipment inspection (PSI). If there is an issue with ST715MR, 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 ST715MR part is unused and in its original packaging.
Return procedure for ST715MR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ST715MR Tags
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MIC5504-1.8YM5-TR
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MIC5504-3.3YM5-TR
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MIC5365-3.0YC5-TR
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MIC5365-2.5YC5-TR
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MIC5365-3.3YC5-TR
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MIC5365-3.3YD5-TR
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MIC5317-3.3YM5-TR
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