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MCP45HV51-502E/ST
Microchip Technology
IC DGTL POT 5KOHM 256TAP 14TSSOP
1711 Pcs New Original In Stock
Digital Potentiometer 5k Ohm 1 Circuit 256 Taps I2C Interface 14-TSSOP
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5.0 / 5.0
- (124 Ratings)
MCP45HV51-502E/ST
Product Overview
1345408
DiGi Electronics Part Number
MCP45HV51-502E/ST-DGManufacturer
Microchip Technology
MCP45HV51-502E/ST
Description
IC DGTL POT 5KOHM 256TAP 14TSSOPInventory
1711 Pcs New Original In Stock
Digital Potentiometer 5k Ohm 1 Circuit 256 Taps I2C Interface 14-TSSOP
Quantity
Minimum 1
Minimum 1
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MCP45HV51-502E/ST Technical Specifications
Category
Data Acquisition, Digital Potentiometers
Packaging
Tube
Series
-
Product Status
Active
DiGi-Electronics Programmable
Not Verified
Taper
Linear
Configuration
Potentiometer
Number of Circuits
1
Number of Taps
256
Resistance (Ohms)
5k
Interface
I2C
Memory Type
Volatile
Voltage - Supply
1.8V ~ 5.5V, 10V ~ 36V, ±5V ~ 18V
Features
Mute, Selectable Address
Tolerance
±20%
Temperature Coefficient (Typ)
100ppm/°C
Mounting Type
Surface Mount
Supplier Device Package
14-TSSOP
Package / Case
14-TSSOP (0.173", 4.40mm Width)
Operating Temperature
-40°C ~ 125°C
Resistance - Wiper (Ohms) (Typ)
145
Base Product Number
MCP45HV51
Datasheet & Documents
HTML Datasheet
MCP45HV51-502E/ST-DG
PCN Design/Specification
Errata/Datasheet Update 13/Jul/2015
Environmental & Export Classification
RoHS Status
ROHS3 Compliant
Moisture Sensitivity Level (MSL)
1 (Unlimited)
REACH Status
REACH Unaffected
ECCN
EAR99
HTSUS
8542.39.0001
Additional Information
Standard Package
96
Reviews
5.0/5.0-(Show up to 5 Ratings)
de desembre 02, 2025
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de desembre 02, 2025
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Frequently Asked Questions (FAQ)
What are the key design-in considerations when using the MCP45HV51-502E/ST in a high-voltage industrial control application to avoid unintended wiper failure?
When integrating the MCP45HV51-502E/ST into high-voltage systems (up to 36V), ensure that the voltage across the potentiometer terminals does not exceed the absolute maximum ratings, especially during power sequencing. A common risk is floating I2C lines or improper initialization causing the wiper to settle at undefined positions, leading to overvoltage stress. Always power up the supply before applying signals, use external ESD protection on the H and L terminals, and initialize the wiper to a known state (e.g., mid-scale) via I2C immediately at startup. Also consider the ±20% resistance tolerance when designing for precision gain control—calibration may be required for critical stages.
Can the MCP45HV51-502E/ST replace the AD5141BCPZ10 in a bidirectional current sensing circuit, and what are the trade-offs in performance and reliability?
The MCP45HV51-502E/ST can replace the AD5141BCPZ10 in many low-to-medium precision applications, but key differences must be evaluated. While the AD5141 offers tighter tolerance (±8%) and non-volatile memory, the MCP45HV51-502E/ST supports higher supply voltages (up to 36V vs. 5.5V), making it better suited for industrial designs needing wide voltage headroom. However, because the MCP45HV51-502E/ST is volatile, the wiper setting is lost on power-down and must be reloaded via I2C at startup—this requires firmware coordination to prevent unsafe initial states in current sensing. Additionally, the higher wiper resistance (~145Ω typ) in the MCP45HV51-502E/ST vs. ~75Ω in the AD5141 may introduce signal errors in low-level analog paths. Use a buffer amplifier if wiper resistance stability is critical.
How does the temperature coefficient of 100ppm/°C in the MCP45HV51-502E/ST impact long-term stability in automotive sensor calibration circuits, and how can drift be mitigated?
With a temperature coefficient of 100ppm/°C, the MCP45HV51-502E/ST can exhibit noticeable resistance drift over the -40°C to 125°C range, especially in sensor gain or offset calibration circuits. For example, over a 100°C change, drift can reach up to 1%, which may degrade measurement accuracy in high-resolution systems. To mitigate this, operate the device within a thermally stable zone on the PCB, avoid placement near heat-generating components, and implement periodic recalibration routines in firmware. Alternatively, consider fixed precision resistors for static calibration points and reserve the MCP45HV51-502E/ST for initial coarse adjustment during production.
What I2C pull-up resistor values should be used with the MCP45HV51-502E/ST in mixed-voltage 3.3V microcontroller systems to ensure reliable communication without bus contention?
In mixed-voltage designs where the MCP45HV51-502E/ST operates at 5V or higher while interfacing with a 3.3V MCU, use level translation or ensure the MCU's I2C pins are 5V-tolerant. For pull-up resistors, select values based on bus capacitance and operating voltage—typically 2.2kΩ to 4.7kΩ on the SCL and SDA lines when running at 5V. If using 3.3V I2C signaling directly on the MCP45HV51-502E/ST, verify that logic 'high' meets the VIH specification (0.7 × VDD), which may require lower pull-ups (e.g., 1.8kΩ) to maintain noise margin. Always check signal integrity with an oscilloscope to prevent communication lockups due to slow rise times or cross-domain leakage.
What are the risks of using the MCP45HV51-502E/ST in audio volume control applications, and how does its wiper resistance affect frequency response and crosstalk?
Using the MCP45HV51-502E/ST for audio volume control introduces risks due to its typical 145Ω wiper resistance and lack of built-in logarithmic taper. The series resistance can interact with downstream input capacitance to form a low-pass filter, attenuating high frequencies—especially noticeable at low volume settings. Additionally, the linear taper doesn't match human loudness perception, leading to uneven volume control. To minimize issues, buffer both the input and output with op amps to isolate impedance effects, and implement a software-mapped logarithmic step profile over the 256 taps. Also, enable the mute function during wiper transitions to eliminate audible 'pops' when adjusting settings.
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MCP45HV51-502E/ST CAD Models
Microchip Technology MCP45HV51-502E/ST PCB symbols & footprints
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