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STMicroelectronics ST715PU33R
- Part No.:
- ST715PU33R
- Manufacturer:
- STMicroelectronics
- Package:
- 8-VDFN Exposed Pad
- Datasheet:
-
ST715PU33R.pdf
- Description:
- IC REG LINEAR 3.3V 85MA 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:22,514
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Product details
Overview
ST715PU33R from STMicroelectronics is a fixed-output 3.3 V, 85 mA low-dropout linear regulator designed for high-input-voltage battery-powered systems. It operates from 2.5 V to 24 V input, delivers 500 mV typical dropout at full load, draws only 3.75–5.5 µA quiescent current, and supports ceramic output capacitors as low as 0.47 µF - enabling use in mobile phones, PDAs, and industrial sensor nodes.
For engineers reviewing the ST715PU33R datasheet, ST715PU33R pinout, ST715PU33R application, or ST715PU33R equivalent, key selection criteria include ultra-low IQ for battery life extension, wide VIN range for multi-cell compatibility, ±5% output accuracy over temperature, and SOT23-5L/SOT323-5L/DFN8 package flexibility for space-constrained designs.
Technical Context
The ST715PU33R implements a bandgap-referenced error amplifier with internal current limiting and thermal shutdown. Its feedback loop is optimized for stability with 0.47–10 µF ceramic capacitors, eliminating need for ESR-tuned tantalum or aluminum electrolytics.
It features a dedicated enable-compatible bias generator and uses a single-stage pass transistor architecture - not a PMOS or NMOS-based topology - resulting in predictable 500 mV dropout behavior across -40 °C to 125 °C junction temperature and 85 mA load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output voltage | Fixed 3.3 V ±5% over -40 °C to 125 °C, ensuring stable MCU core or RF front-end supply under thermal stress. |
| Input voltage range | 2.5 V to 24 V DC - supports single Li-ion up to 4-cell alkaline or 12 V industrial rails without external pre-regulation. |
| Dropout voltage | 500 mV typ. at 85 mA - enables 3.3 V output from 3.8 V input, critical for brownout margin in battery discharge profiles. |
| Quiescent current | 3.75–5.5 µA over full temp/load range - extends shelf life and runtime in always-on IoT sensors and wearables. |
| Output capacitor support | 0.47 µF to 10 µF ceramic - reduces BOM count and PCB area vs. legacy LDOs requiring ≥2.2 µF with minimum ESR. |
| Short-circuit current limit | 120 mA at VIN = 3.8 V - provides robust fault containment without external current-sense circuitry. |
| Supply voltage rejection | 38 dB at 1 kHz, 57 dB at 100 kHz - suppresses switching noise from adjacent DC-DC converters in mixed-signal systems. |
Pinout & Package
ST715PU33R is available in SOT23-5L (marking: 71533), SOT323-5L (marking: 733), and DFN8 (3×3 mm) packages. The SOT23-5L variant is used in this part number configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN (Pin 4) | Input voltage supply | Accepts 2.5–24 V; requires local 0.1 µF 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 directly to PCB ground plane. |
| OUT (Pin 5) | Regulated output | Delivers 3.3 V ±5% at up to 85 mA; connects to load and output capacitor (≥0.47 µF ceramic). |
| NC (Pins 1, 3) | No connect | Internally unconnected; must remain floating - no routing or soldering required. |
| FB (Pin 1, adjustable version only) | Feedback input | Not used on ST715PU33R (fixed version); left unconnected per datasheet Table 3. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | 3.75 µA min. at full load and -40 °C to 125 °C - enables >10-year battery life in coin-cell-powered remote sensors. |
| Wide input voltage range | 2.5 V to 24 V operation - eliminates need for intermediate buck stages in multi-battery or automotive accessory applications. |
| Ceramic capacitor compatibility | Stable with 0.47 µF output capacitance - reduces solution size by >50% vs. legacy LDOs requiring ≥2.2 µF with 1–5 Ω ESR. |
| Thermal and short-circuit protection | Internal foldback current limit + thermal shutdown - prevents damage during sustained overload or PCB overheating. |
| High PSRR at RF frequencies | 57 dB rejection at 100 kHz - maintains clean 3.3 V rail for Bluetooth/Wi-Fi transceivers co-located with noisy DC-DC converters. |
Applications
| Mobile Handset Power Management | Industrial Sensor Node Supply |
|---|---|
|
Use Scenario: Powering baseband processor I/O banks and audio codec in dual-SIM smartphones with 3.7–4.2 V Li-ion battery. IC Role / Device Role / Timing Role: Primary 3.3 V LDO for noise-sensitive analog peripherals requiring <210 µV RMS output noise. Use Value: Maintains 3.3 V regulation down to 3.8 V battery voltage, extending usable discharge cycle by 12% vs. 600 mV-dropout alternatives. |
Use Scenario: Providing regulated 3.3 V to LoRaWAN node MCU, sub-GHz transceiver, and MEMS accelerometer in factory-floor wireless sensor. IC Role / Device Role / Timing Role: Standby-mode power source with <5.5 µA IQ, enabling 15-year battery life on CR2032 cell. Use Value: Enables direct connection to 12 V industrial bus via single-stage regulation - reducing bill-of-materials by one DC-DC stage. |
| Personal Digital Assistant (PDA) | Cordless Phone Base Station |
|
Use Scenario: Supplying 3.3 V to touchscreen controller and NAND flash interface in handheld PDA with removable AA/AAA battery pack. IC Role / Device Role / Timing Role: Low-noise, low-IQ regulator supporting fast wake-from-sleep transitions with 0.7 ms turn-on time. Use Value: Achieves <0.003 %/mA load regulation - prevents display flicker during simultaneous touch and memory access bursts. |
Use Scenario: Generating 3.3 V for DECT radio IC and LED status indicators in mains-powered cordless phone base station. IC Role / Device Role / Timing Role: Input-filter tolerant LDO accepting 5–24 V unregulated adapter output with 38 dB 1 kHz ripple rejection. Use Value: Eliminates need for post-regulator LC filter - reducing board area and cost while meeting EN55022 Class B emissions. |
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, 100 mA, 120 mV dropout at 100 mA, 1.0 µA IQ - lower dropout but narrower 2.0–6.0 V VIN range. | Only suitable for single-cell Li-ion or 3.3 V systems; cannot replace ST715PU33R in 12–24 V industrial inputs. | Select when ultra-low dropout and minimal IQ are prioritized over input voltage range. |
| Diodes Inc. AP2210-3.3TRG1 | 3.3 V fixed, 150 mA, 600 mV dropout at 150 mA, 50 µA IQ - higher current but 10× higher quiescent current. | Better for high-pulse-load apps (e.g., motor drivers), but unsuitable for multi-year battery operation. | Select when peak load exceeds 85 mA and standby IQ is not critical. |
Compared with XC6219B332MR-G and AP2210-3.3TRG1, ST715PU33R uniquely balances 24 V max input, 3.8 µA IQ, and 85 mA capability - making it the only choice for long-life, wide-input industrial and portable systems where both voltage headroom and energy efficiency are non-negotiable.
Availability
ST715PU33R is available at Aetrix Electronics and suitable for mobile handset power management, industrial sensor node supply, PDA subsystem regulation, and cordless phone base station design requiring stable component supply across extended temperature and multi-year production cycles.
Supply support for ST715PU33R 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, sensors, and analog components for industrial, automotive, and consumer markets.
The ST715 series was developed specifically for ultra-low-power, high-input-voltage linear regulation in battery-constrained and wide-rail industrial applications - emphasizing quiescent current minimization without sacrificing voltage range or thermal robustness.
FAQ
What is the maximum allowable input voltage for ST715PU33R?
The absolute maximum DC input voltage is 26 V, but the recommended operating range is 2.5 V to 24 V per datasheet Table 4. Operation above 24 V risks exceeding thermal limits even at light loads due to increased power dissipation - especially in SOT23-5L packages with 195 °C/W junction-to-ambient resistance.
Can ST715PU33R be used with a 0.47 µF ceramic output capacitor?
Yes - the device is explicitly characterized and guaranteed stable with 0.47 µF ceramic capacitors (Table 7, COUT specification). This value meets minimum phase margin requirements across -40 °C to 125 °C and eliminates need for ESR tuning, unlike many legacy LDOs that require ≥2.2 µF with 1–5 Ω ESR.
Does ST715PU33R have an enable pin?
No - ST715PU33R has no enable (EN) pin. It is always-on when VIN is within specification. For applications requiring controlled startup or standby mode, an external MOSFET switch on the IN rail or selection of the adjustable ST715xxR variant with FB pin control is required.
How does thermal performance differ between SOT23-5L and DFN8 packages?
DFN8 (3×3 mm) offers 52 °C/W junction-to-ambient thermal resistance versus 195 °C/W for SOT23-5L (Table 5). At 85 mA and 24 V input, DFN8 dissipates heat ~3.7× more effectively - enabling continuous operation at ambient temperatures up to 105 °C, whereas SOT23-5L is limited to ~65 °C ambient under same conditions.
ST715PU33R Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 8-VDFN Exposed Pad
- 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):
- 5.5 µA
- Current - Supply (Max):
- 6.5 µA
- PSRR:
- 57dB ~ 38dB (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:
- 8-DFN (3x3)
ST715PU33R FAQ
1.How can I place an order for ST715PU33R through Aetrix?
Please submit a Request for Quotation (RFQ) for ST715PU33R 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 ST715PU33R reliable?
The price and inventory of ST715PU33R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ST715PU33R is usually 5 days.
3.What payment methods are accepted for ST715PU33R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ST715PU33R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ST715PU33R?
ST715PU33R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ST715PU33R 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 ST715PU33R?
For technical support, including ST715PU33R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ST715PU33R requirements.
6.How does Aetrix verify that ST715PU33R is sourced from the original manufacturer or authorized distributors?
All ST715PU33R 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 ST715PU33R meets industry standards.
7.What is the process for return or replacement of ST715PU33R?
All ST715PU33R units undergo pre-shipment inspection (PSI). If there is an issue with ST715PU33R, 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 ST715PU33R part is unused and in its original packaging.
Return procedure for ST715PU33R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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