MCP1700T-3302E/TT - 250mA, 3.3V LDO Regulator | Microchip
MPN: MCP1700T-3302E/TT ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0.42 | $0.42 |
| 10 | $0.38 | $3.80 |
| 100 | $0.3 | $30.00 |
| 500 | $0.24 | $120.00 |
| 1,000 | $0.21 | $210.00 |
| 3,000 | $0.18 | $540.00 |
MCP1700T-3302E/TT Overview
An LDO (Low-Dropout) linear regulator is a type of voltage regulator that maintains a stable output voltage even when the input supply is only a few hundred millivolts above the output voltage. Unlike switching regulators, an LDO converts the excess input voltage into heat rather than storing energy in magnetic fields, which yields an inherently low-noise output that is free of switching ripple. LDOs sit within a broader taxonomy of voltage regulators under the power management IC family, and are widely used as post-regulators following switching converters to provide clean rails for noise-sensitive analog and digital blocks.
Key features of the MCP1700T-3302E/TT include ±2% output voltage accuracy, internal thermal shutdown, short-circuit current limiting, and a wide operating temperature range from -40 °C to +125 °C. The device is AEC-Q100 qualified, making it suitable for automotive applications, and is RoHS compliant. The CMOS construction eliminates the ground pin current that plagues bipolar LDOs, which means quiescent current stays nearly constant across the load range.
Typical applications include single-cell Li-ion powered portable devices, two- and three-cell primary battery systems (alkaline, NiMH, NiCd), USB-powered peripherals, microcontroller core supply rails, real-time clock backup supplies, IoT sensor nodes, and automotive infotainment modules. The 6 V maximum input makes it well suited for 5 V rails, while the 2.3 V minimum supports direct connection to a single Li-ion cell.
When designing with this part, choose input and output ceramic capacitors that meet the manufacturer ESR stability requirement and place them within a few millimeters of the pins. Because the quiescent current is only 1.6 microamps, the part is ideal for always-on standby rails in battery-powered products where every microamp matters across years of shelf life.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone. Source: Microchip MCP1700 datasheet (20001826F) and DigiKey/Mouser distributor listings accessed on 2026-10-14.
Drop-in alternatives for MCP1700T-3302E/TT — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
MCP1700T-3002E/TT
✅ Drop-In📋 Reference alternative (not in catalog)
MCP1700T-2502E/TT
✅ Drop-In📋 Reference alternative (not in catalog)
MCP1700T-1802E/TT
✅ Drop-In📋 Reference alternative (not in catalog)
MCP1700T-3302E/MB
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
BL8552CB3TR30
✅ Drop-In📋 Reference alternative (not in catalog)
HT7333-A
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
MCP1700T-3302E/TT Maximum Ratings & Electrical Characteristics
| Regulator Type | LDO, Positive Fixed |
| Output Voltage | 3.3 V |
| Output Voltage Accuracy | ±2% |
| Maximum Output Current | 250 mA |
| Input Voltage Range | 2.3 V to 6.0 V |
| Dropout Voltage | 178 mV (typical at 250 mA) |
| Quiescent Current | 1.6 microamps (typical) |
| Operating Temperature Range | -40 °C to +125 °C |
| Package | SOT-23-3 (TO-236AA) |
| Mounting Type | Surface Mount |
| Number of Pins | 3 |
| Pinout | Pin 1 VIN, Pin 2 GND, Pin 3 VOUT |
| Thermal Protection | Internal thermal shutdown |
| Current Limit | Internal short-circuit current limit |
| MSL Level | 1 (unlimited) |
| RoHS Status | Compliant |
| AEC-Q100 Qualified | Yes |
| Packaging | Tape & Reel (TT suffix) |
MCP1700T-3302E/TT Pin Configuration
| Pin 1 | VIN — Input supply voltage (2.3 V to 6.0 V) |
| Pin 2 | GND — Ground reference |
| Pin 3 | VOUT — Regulated 3.3 V output (up to 250 mA) |
Typical Applications
MCP1700T-3302E/TT is suitable for 6 applications: Single-Cell Li-Ion Powered IoT Sensor Node, Two- and Three-Cell Alkaline / NiMH Battery Powered Devices, USB-Powered Peripheral and Accessory Rail, Automotive Infotainment and Body Electronics, Real-Time Clock (RTC) Backup Supply, Microcontroller Core and Sensor Power Rail.
Single-Cell Li-Ion Powered IoT Sensor Node
The MCP1700T-3302E/TT is well-suited as the 3.3 V core rail for an IoT sensor node powered directly from a single Li-ion or Li-poly cell. With a 1.6 microamp quiescent current and an input range down to 2.3 V, the regulator can stay in regulation as the battery drops from 4.2 V fully charged to roughly 3.5 V cut-off, while burning only microamps when the radio and MCU are in deep sleep. The 178 mV dropout at 250 mA means even at the battery end-of-life the regulator still maintains a clean 3.3 V output for short transmit bursts. Place a 1 microfarat ceramic input cap and a 1 microfarat ceramic output cap within 5 mm of the pins per the Microchip MCP1700 datasheet stability requirement.
Recommended
Two- and Three-Cell Alkaline / NiMH Battery Powered Devices
The MCP1700T-3302E/TT was designed specifically for two- and three-primary-cell battery applications per the Microchip datasheet. Two alkaline or NiMH cells in series deliver 2.0 V to 3.2 V over their discharge curve, and three cells deliver 3.0 V to 4.8 V. The regulator's 2.3 V minimum input and 178 mV dropout allow it to extract nearly all usable energy from the battery pack before the MCU browns out, while the 1.6 microamp quiescent draw keeps shelf-life drain to a minimum. Use a 1 microfarat X7R ceramic on both input and output to keep the ESR within the stability window over the full -40 °C to +125 °C range.
Recommended
USB-Powered Peripheral and Accessory Rail
The MCP1700T-3302E/TT can be used as a post-regulator on a 5 V USB rail to deliver a clean 3.3 V to low-power peripherals, sensors, and MCUs. While USB provides 5 V directly, many modern low-power ICs require 3.3 V, and the LDO's ±2% accuracy and lack of switching noise make it ideal for analog sensor front-ends. At 250 mA maximum load, it comfortably powers small sensor hubs, Bluetooth Low SoCs, and microcontroller development boards. Place the LDO after the USB ESD protection and bulk decoupling caps; an additional 100 nF high-frequency bypass at the LDO input improves PSRR for switching noise on the upstream USB rail.
Recommended
Automotive Infotainment and Body Electronics
The MCP1700T-3302E/TT is AEC-Q100 qualified per Arrow and Microchip product listings, making it suitable for automotive applications such as infotainment auxiliary rails, body control modules, and remote keyless entry receivers. The 6 V maximum input survives load-dump transients when paired with upstream TVS protection, while the 250 mA current capability supports small sensor and microcontroller subsystems. The wide -40 °C to +125 °C operating range covers the full automotive Grade 1 temperature window. Automotive designs should add reverse-battery protection and follow Microchip's AN2288 reference design for EMC compliance.
Recommended
Real-Time Clock (RTC) Backup Supply
The MCP1700T-3302E/TT is ideal for providing a clean 3.3 V rail to an external RTC such as a DS3231 or PCF8563 from a coin cell or super-capacitor backup. The 1.6 microamp quiescent current adds negligibly to the RTC's own microamp-class draw, so the backup source can last years without replacement. The 2.3 V minimum input lets the regulator run from a single Li-ion coin cell down to its end-of-life voltage, ensuring the RTC continues to keep accurate time through battery replacement of the main system supply. Bypass the output with a 10 microfarat tantalum or ceramic cap to absorb the brief current spikes when the RTC oscillator starts.
Recommended
Microcontroller Core and Sensor Power Rail
The MCP1700T-3302E/TT provides a clean 3.3 V rail for microcontrollers, sensors, and small mixed-signal ICs in industrial and consumer designs. Because it is a linear LDO with no switching ripple, it does not inject noise into adjacent analog or RF circuits, which makes it ideal for mixed-signal boards where a switching regulator powers the digital domain and this LDO post-regulates for the analog domain. The 250 mA current limit comfortably drives an MCU plus a small sensor cluster. Decouple the LDO output with a 1 microfarat X7R ceramic plus a 100 nF NP0 bypass in parallel for broadband noise rejection from DC to tens of MHz.
Recommended
Recommended Products Summary
Engineering reference data for MCP1700T-3302E/TT — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | MCP1700T-3002E/TT | MCP1700T-2502E/TT | MCP1700T-1802E/TT | MCP1700T-3302E/MB | BL8552CB3TR30 |
|---|---|---|---|---|---|---|
| Package | SOT-23-3 (TO-236AA) | SOT-23-3 - same | SOT-23-3 - same | SOT-23-3 - same | SOT-89-3 (MB) - higher dissipation | SOT-23-3 - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Shanghai Belling |
| Output Voltage | 3.3 V | 3.0 V | 2.5 V | 1.8 V | 3.3 V | 3.0 V |
| AEC-Q100 Automotive Qualified | Yes | Yes | Yes | Yes | Yes | Not automotive |
Key Differentiators
- Ultra-low 1.6 microamp quiescent current (vs BL8552CB3TR30 (Shanghai Belling))
- AEC-Q100 qualified for automotive applications (vs HT7333-A (Holtek))
- Wide 2.3 V to 6.0 V input covers single-cell Li-ion to 5 V USB (vs MCP1702T-3302E (Microchip, 500 mA variant))
Design Notes
Estimated: at VIN=5.0 V, VOUT=3.3 V, and 100 mA continuous load, the regulator dissipates (5.0 - 3.3) × 0.100 = 0.170 W. The SOT-23-3 package has a thermal resistance of approximately 200 °C/W on a standard 1 oz copper pour, yielding a junction-temperature rise of roughly 34 °C above ambient. At full 250 mA load the dissipation climbs to 0.425 W, so for high-duty 250 mA operation a small copper-pour increase or upgrading to the SOT-89-3 MB variant is recommended. The MB package variant has a thermal pad that drops theta_JA to roughly 60 °C/W, allowing full 250 mA operation across the full -40 °C to +125 °C range without derating.
Place both input and output capacitors within 3 mm of the LDO pins, using short, wide copper traces. The Microchip MCP1700 datasheet requires a minimum 1 microfarat ceramic output capacitor with ESR below 1 ohm for stability; X7R or X5R dielectric parts work well across the full temperature range. For applications that experience large load transients (e.g., a radio transmit burst), increase the output cap to 2.2 or 4.7 microfarat to improve transient response. The GND pin should be tied to a low-impedance ground plane with at least one via to the inner ground layer within 5 mm of the pin.
Do not reverse the input and output pins - the SOT-23-3 pinout is VIN (1), GND (2), VOUT (3), and reversing VIN/VOUT will damage the device. Do not exceed the 6.0 V absolute maximum input rating; even brief transients above 6.5 V can permanently damage the regulator. For automotive load-dump environments, add a TVS diode and series resistor upstream. Do not rely on the LDO for reverse-battery protection - add a P-FET or Schottky if reverse polarity is possible. Finally, when migrating from SOT-23-3 to SOT-89-3 (MB variant), note that the pinout is NOT identical (SOT-89 has different pin ordering), so the PCB layout must be redrawn.
Compliance Information
AEC-Q100 qualified per Arrow and Microchip product listings. RoHS and REACH compliant per Microchip product page. Halogen-free per Microchip environmental compliance datasheet.
