MCP40D18T-503E/LT Microchip Integrated Circuit (SOT23 (6-Pin)) In Stock
Microchip MCP40D18T-503E/LT is a single-channel digital potentiometer with 50 kΩ end-to-end resistance and 128 linear wiper positions, controlled via a 2-wire I2C interface in a compact 6-pin SC-70 package. It enables software-adjustable voltage dividers, gain control, and offset trimming for audio, signal conditioning, and calibration circuits.
- Manufacturer
- Microchip
- Package
- SOT23 (6-Pin)
- Pin Count
- 6
- Lifecycle
- OBSOLETE
- Datasheet
- MCP40D18T-503E/LT Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $0.6000(MOQ 1)
- Temp Range
- -40.0°C to 125.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- 50 kΩ end-to-end resistance with 128 linear wiper positions
- 2-wire I2C serial control interface for easy MCU integration
- Single-channel digital potentiometer in 6-pin SC-70 package
- Non-volatile wiper position storage retains setting after power-off
- 0.26 kHz bandwidth suitable for audio and DC trim applications
- Pb-free and RoHS-compliant (JESD-609 e3)
Applications
MCP40D18T-503E/LT is used for software-controlled gain adjustment in instrumentation amplifiers, offset calibration in sensor signal chains, and volume control in audio interface circuits. Its I2C interface and 128 wiper positions allow fine-grained digital tuning of analog parameters without mechanical trimmer replacement in production-calibrated embedded systems.
Specifications
| Pbfree Code | Yes |
| Factory Lead Time | 4Weeks |
| YTEOL | 0 |
| Bandwidth-Nom | 0.26kHz |
| Control Interface | 2-WIRE SERIAL |
| Converter Type | DIGITAL POTENTIOMETER |
| JESD-30 Code | R-PDSO-G6 |
| JESD-609 Code | e3 |
| Number of Functions | 1 |
| Number of Positions | 128 |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | TSSOP6,.08 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE, THIN PROFILE, SHRINK PITCH |
| Qualification Status | Not Qualified |
| Resistance Law | LINEAR |
| Resistance Tolerance-Max | 20% |
| Resistor Terminal Voltage-Max | 5.5V |
| Screening Level | TS 16949 |
| Supply Current-Max | 0.08mA |
| Supply Voltage-Nom | 2.7V |
| Surface Mount | YES |
| Technology | CMOS |
| Temperature Coefficient-Nom | 150ppm/°C |
| Temperature Grade | AUTOMOTIVE |
| Terminal Finish | Matte Tin (Sn) |
| Terminal Form | GULL WING |
| Terminal Pitch | 0.65mm |
| Terminal Position | DUAL |
| Total Resistance-Nom | 50000Ω |
| Package | SOT23 (6-Pin) |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.01 |
| Country of Origin | Thailand |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
How many discrete resistance steps does MCP40D18T-503E/LT offer, and how does that affect trim precision?
MCP40D18T-503E/LT provides 128 linear wiper positions across a 50 kΩ end-to-end resistance, yielding a nominal step size of approximately 390 Ω per increment. This resolution is sufficient for gain trimming and offset adjustment in most sensor signal conditioning circuits where 1% gain accuracy is acceptable.
Does MCP40D18T-503E/LT retain its wiper position after power is removed?
Yes. MCP40D18T-503E/LT includes non-volatile memory that saves the last programmed wiper position, so the potentiometer restores its setting at power-up without requiring the MCU to re-initialize it. This is important for calibration trimmers and volume controls that should not reset on every power cycle.
For an I2C-controlled gain stage running at 3.3 V, what control bandwidth does MCP40D18T-503E/LT support?
MCP40D18T-503E/LT has a nominal resistance-bandwidth of 0.26 kHz, which governs how fast the analog resistance element responds to AC signals, not the I2C update rate. For DC trim and low-frequency gain adjustment below 260 Hz, the device is well suited; higher-frequency AC signal paths require a wider-bandwidth digital potentiometer.
Is the SC-70-6 package of MCP40D18T-503E/LT appropriate for space-constrained PCBs in portable instruments?
Yes. The 6-pin SC-70 body measures approximately 1.25 mm × 2.0 mm, making it one of the smallest packages available for digital potentiometers. It fits tightly populated boards in handheld meters, wearable sensors, and compact calibration modules where a 6-pin SOT-23 form factor is too large.
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