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onsemi NCP502SN37T1G
- Part No.:
- NCP502SN37T1G
- Manufacturer:
- onsemi
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
NCP502SN37T1G.pdf
- Description:
- IC REG LINEAR 3.7V 80MA 5TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,244
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Product details
Overview
NCP502SN37T1G from onsemi is a fixed-output, low-quiescent-current CMOS linear voltage regulator delivering 3.7 V at up to 80 mA with 2.0% output voltage accuracy and 850 mV typical dropout at 80 mA. It features PMOS pass transistor architecture, ultra-low 40 µA quiescent current, and operates across −40 °C to +85 °C for battery-powered portable instrumentation.
For engineers reviewing the NCP502SN37T1G datasheet, pinout, applications, or equivalent options, key selection criteria include its TSOP-5 package compatibility, enable threshold logic (1.3 V high / 0.3 V low), ceramic-capacitor stability, and industrial-temperature LDO performance in space-constrained handheld systems.
Technical Context
The NCP502SN37T1G implements a PMOS-based low-dropout architecture with internal voltage reference, error amplifier, and thermal/current limiting protection. Its enable input controls output state with defined logic thresholds, and it requires no minimum load or specific ESR output capacitor.
Designed for ceramic-capacitor stability, the device achieves 55 dB ripple rejection at 1 kHz and 180 µVRMS output noise (100 Hz–100 kHz). Dropout voltage is specified at 850 mV (typ) under full 80 mA load at −40 °C to +85 °C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.7 V ±2.0% - tightly regulated supply for 3.3 V–3.8 V logic rails and analog sensors |
| Max Output Current | 80 mA - sufficient for microcontrollers, RF transceivers, and sensor signal chains |
| Quiescent Current | 40 µA typical - enables multi-year battery life in always-on IoT endpoints |
| Dropout Voltage | 850 mV typ @ 80 mA - supports operation down to Vin = 4.55 V while maintaining 3.7 V output |
| Line Regulation | 0.4 mV/V - ensures stable output despite battery voltage sag from 4.55 V to 12 V input |
| Thermal Range | −40 °C to +85 °C - qualified for industrial and consumer portable equipment environments |
| Ripple Rejection | 55 dB @ 1 kHz - suppresses switching noise from upstream DC/DC converters |
Pinout & Package
Package: TSOP-5 (SOT-23-5, Case 483), 3.00 mm × 1.50 mm × 0.95 mm, Pb-free, surface-mount.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Vin | Positive power supply input | Accepts 4.55 V to 12 V; connects to battery or pre-regulated rail |
| 2 - GND | Power ground reference | Must be low-impedance connection to minimize noise coupling and thermal rise |
| 3 - Enable | Active-high enable control | Pull ≥1.3 V to activate; pull ≤0.3 V to disable; tie to Vin if unused |
| 4 - N/C | No internal connection | Not bonded; PCB trace may be omitted or left floating (no routing required) |
| 5 - Vout | Regulated output voltage | Delivers 3.7 V ±2.0%; requires ≥1.0 µF ceramic capacitor placed adjacent to pin |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | 40 µA typical - extends shelf life and runtime in coin-cell–powered devices |
| Ceramic-capacitor compatible | Stable with 1.0 µF X5R/X7R ceramics - eliminates need for costly tantalum or electrolytic caps |
| Enable control with defined thresholds | 1.3 V turn-on / 0.3 V turn-off - enables clean power sequencing with standard logic-level GPIOs |
| Thermal shutdown protection | Activates at ~160 °C junction - prevents catastrophic failure during overload or poor heatsinking |
| Industrial temperature range | −40 °C to +85 °C operation - suitable for non-automotive embedded systems without derating |
Applications
| Portable Medical Sensors | Wearable Fitness Trackers |
|---|---|
|
Use Scenario: Powering low-power analog front-end (AFE) and BLE SoC in disposable patch monitors. IC Role / Device Role / Timing Role: Primary 3.7 V LDO supplying ADC bias, op-amp rails, and radio core voltage. Use Value: 40 µA quiescent current enables >3-year battery life on CR2032; 850 mV dropout allows operation until battery reaches 4.55 V. |
Use Scenario: Regulating voltage for motion sensor hub and display driver in wrist-worn devices. IC Role / Device Role / Timing Role: Standby-mode LDO enabling rapid wake-up via enable pin controlled by MCU GPIO. Use Value: Defined 1.3 V enable threshold ensures reliable activation from 1.8 V I/O domains; TSOP-5 footprint saves board area. |
| Handheld Test Instruments | Smart Home Sensor Nodes |
|
Use Scenario: Providing precision 3.7 V rail for 16-bit SAR ADC and reference buffer in pocket multimeters. IC Role / Device Role / Timing Role: Low-noise, low-drift voltage source with 100 ppm/°C tempco and 180 µVRMS noise. Use Value: 2.0% output accuracy and <0.4 mV/V line regulation maintain measurement integrity across battery discharge cycle. |
Use Scenario: Powering Zigbee/Thread SoC and environmental sensors (temp/humidity/pressure) in battery-operated nodes. IC Role / Device Role / Timing Role: Always-on LDO supporting deep-sleep modes with sub-µA system leakage. Use Value: Internally limited power dissipation and thermal shutdown prevent field failures in sealed enclosures with no airflow. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1700T-3702E/TT | 3.7 V output, 250 mA max, 1.6 µA quiescent current, SOT-23-3 package (no enable) | Lacks enable pin and thermal shutdown; higher output current but lower PSRR (45 dB @ 1 kHz) | Select when ultra-low IQ dominates over protection features and enable control is unnecessary |
| TNIV502SN37T1G | Same electrical specs and pinout; automotive-grade AEC-Q100 qualified, −40 °C to +125 °C operation | Qualified for automotive cabin modules and ADAS edge sensors requiring extended temperature range | Select when design requires automotive qualification, PPAP support, or operation above +85 °C ambient |
Compared with MCP1700T-3702E/TT, NCP502SN37T1G provides enable control and thermal protection at the cost of higher IQ; compared with TNIV502SN37T1G, it offers identical functionality at lower cost and qualification scope for industrial use cases.
Availability
NCP502SN37T1G is available at Aetrix Electronics and suitable for portable medical sensors, wearable fitness trackers, handheld test instruments, and smart home sensor nodes requiring stable component supply with long-term manufacturability assurance.
Supply support for NCP502SN37T1G 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
onsemi (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient power management, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The NCP502 series belongs to onsemi's precision low-IQ LDO portfolio, engineered specifically for battery-powered handheld equipment where ultra-low standby current, small footprint, and ceramic-capacitor compatibility are critical.
FAQ
What is the maximum input voltage rating for the NCP502SN37T1G?
The NCP502SN37T1G has an absolute maximum input voltage of 12 V, as specified in the Maximum Ratings table. Operation beyond this limit risks permanent damage. For reliable 3.7 V output at 80 mA, minimum recommended input is 4.55 V (3.7 V + 850 mV dropout); typical designs use 4.5 V–6.0 V inputs to balance efficiency and headroom.
Does the NCP502SN37T1G require an external output capacitor, and what type is recommended?
Yes, the NCP502SN37T1G requires a minimum 1.0 µF ceramic output capacitor (X5R or X7R dielectric) placed adjacent to the Vout and GND pins. The device is stable across a wide ESR range (a few mΩ to 5 Ω), enabling use of low-cost MLCCs without added series resistance. TDK part numbers C2012X5R1C105K or C1608X5R1A105K are validated alternatives.
Can the enable pin of the NCP502SN37T1G be left unconnected, or must it be tied to a voltage?
The enable pin of the NCP502SN37T1G must not be left floating. If unused, it must be connected directly to Vin to ensure the regulator remains active. Floating the pin risks erratic behavior due to noise coupling or undefined logic state. When used, drive it with a clean digital signal meeting the 1.3 V (min) high and 0.3 V (max) low thresholds.
What is the thermal resistance (RJA) of the NCP502SN37T1G in its TSOP-5 package?
The NCP502SN37T1G in TSOP-5 (Case 483) has a junction-to-ambient thermal resistance (RJA) of 205 °C/W under standard test conditions: 1 oz copper, 100 mm² pad area on FR4 PCB. This value assumes optimal PCB layout; actual RJA improves with larger copper pours and thermal vias. At 80 mA and 4.55 V input, power dissipation is ~68 mW, resulting in ~14 °C junction rise above ambient.
Is the NCP502SN37T1G still in active production, or has it been discontinued?
The NCP502SN37T1G remains orderable and actively supported per onsemi's April 2026 datasheet revision (Rev. 23), though several SC70-5 variants (e.g., NCP502SQxxT2G) are marked discontinued. The TSOP-5 version NCP502SN37T1G appears in the active ordering table on page 7 with shipping status "3000 / Tape & Reel", confirming ongoing availability through authorized distributors and Aetrix Electronics.
NCP502SN37T1G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- SOT-23-5 Thin, TSOT-23-5
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 12V
- Voltage - Output (Min/Fixed):
- 3.7V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 1.2V @ 80mA
- Current - Output:
- 80mA
- Current - Quiescent (Iq):
- 40 µA
- Current - Supply (Max):
- 90 µA
- PSRR:
- 55dB (1kHz)
- Control Features:
- Enable
- Protection Features:
- Over Current, Over Temperature
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 5-TSOP
NCP502SN37T1G FAQ
1.How can I place an order for NCP502SN37T1G through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP502SN37T1G 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 NCP502SN37T1G reliable?
The price and inventory of NCP502SN37T1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP502SN37T1G is usually 5 days.
3.What payment methods are accepted for NCP502SN37T1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP502SN37T1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP502SN37T1G?
NCP502SN37T1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP502SN37T1G 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 NCP502SN37T1G?
For technical support, including NCP502SN37T1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP502SN37T1G requirements.
6.How does Aetrix verify that NCP502SN37T1G is sourced from the original manufacturer or authorized distributors?
All NCP502SN37T1G 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 NCP502SN37T1G meets industry standards.
7.What is the process for return or replacement of NCP502SN37T1G?
All NCP502SN37T1G units undergo pre-shipment inspection (PSI). If there is an issue with NCP502SN37T1G, 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 NCP502SN37T1G part is unused and in its original packaging.
Return procedure for NCP502SN37T1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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