Part A
AD5243BRMZ100
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 5248 Stückzahl
- Package
- MSOP-10
- Series
- Datenerfassung
Replacement verdict
Compatible functional replacement candidate
The AD5243BRMZ100 and AD5243BRM50 are functionally compatible digital potentiometers from the same AD5243 family, sharing identical package, interface, channel count, and operating specifications. The only meaningful difference is the end-to-end resistance value, which directly affects the wiper resistance ratio and the resulting adjustable range in the target circuit. Designers must verify that the 100 kΩ versus 50 kΩ nominal resistance is acceptable for the intended signal chain before substituting one for the other.
End-to-End Resistance
High match
Package Type
High match
Interface Type
High match
Channel Count
High match
Parts at a glance
Part B
AD5243BRM50
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 5139 Stückzahl
- Package
- MSOP-10
- Series
- Datenerfassung
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD5243BRMZ100 | AD5243BRM50 | Why it matters |
|---|---|---|---|
| End-to-End Resistance | 100 kΩ | 50 kΩ | Determines the nominal resistance range of the digital potentiometer and directly affects the current through and voltage across the wiper circuit. |
| Number of Positions | 256 | 256 | Defines the resolution of the potentiometer; 256 positions provide 8-bit adjustment for both parts. |
| Interface Type | I2C | I2C | Determines the digital communication protocol required to control the device; both parts use the same 2-wire I2C bus. |
| Supply Voltage Range | 2.7 V to 5.5 V | 2.7 V to 5.5 V | Specifies the allowable power supply range for correct operation and compatibility with system logic levels. |
| Number of Potentiometers | 2 | 2 | Indicates how many independent variable resistors are integrated in the package, affecting channel count in the design. |
| Package / Mounting Type | 10-Lead MSOP, Surface Mount | 10-Lead MSOP, Surface Mount | Determines the PCB footprint and assembly process; identical packages allow drop-in replacement without layout changes. |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +125 °C | Defines the environmental conditions under which the device is guaranteed to meet specifications. |
| Wiper Resistance (Typical) | 60 Ω | 60 Ω | Represents the on-resistance of the internal wiper switch, which adds to the programmed resistance and affects accuracy. |
| Nominal Resistance Tolerance | ±30 % | ±30 % | Indicates the part-to-part variation in end-to-end resistance, which impacts absolute resistance accuracy in the application. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD5243BRMZ100 | AD5243BRM50 |
|---|---|---|
| Supplier | - | Analog Devices Inc. |
| Part Status | Active | Obsolete |
| Taper | Linear | Linear |
| Configuration | Potentiometer | Potentiometer |
| Number of Circuits | 2 | 2 |
| Number of Taps | 256 | 256 |
| Resistance(Ohms) | 100k | 50k |
| Interface | I²C | I²C |
| Memory Type | Volatile | Volatile |
| Voltage - Supply | 2.7V ~ 5.5V | 2.7V ~ 5.5V |
| Tolerance | -20%, +55% | -20%, +55% |
| Temperature Coefficient(Typ) | 35ppm/°C | 35ppm/°C |
| Mounting Type | Surface Mount | Surface Mount |
| Operating Temperature | -40°C ~ 125°C | -40°C ~ 125°C |
Frequently asked questions
What is the main difference between the AD5243BRMZ100 and the AD5243BRM50?
The primary difference is the end-to-end resistance value: the AD5243BRMZ100 has a 100 kΩ nominal resistance, while the AD5243BRM50 has a 50 kΩ nominal resistance. Both are dual-channel, 256-position digital potentiometers from Analog Devices in a 10-lead MSOP package.
Are the AD5243BRMZ100 and AD5243BRM50 pin-compatible?
Yes. Both devices are offered in the same 10-lead MSOP (RM) package and share the same pinout, so they are pin-compatible. The difference is the internal resistor array value, not the package or pin functions.
Can the AD5243BRMZ100 and AD5243BRM50 be used interchangeably in a design?
Not without validating the circuit. Because the end-to-end resistance differs by a factor of two, the wiper resistance, current through the potentiometer, and the resulting voltage divider ratios for a given digital code will differ. The replacement is only appropriate if the target design tolerates the changed resistance and the associated effects on gain, bias, or loading.
What is the resolution and number of positions for both devices?
Both the AD5243BRMZ100 and AD5243BRM50 are 256-position digital potentiometers, providing 8-bit resolution per channel. Each device contains two independent potentiometers.
What supply voltage and interface do the AD5243BRMZ100 and AD5243BRM50 use?
Both devices operate from a single 2.7 V to 5.5 V supply and use a 3-wire SPI-compatible serial interface for programming the wiper positions. They also feature a nonvolatile memory that retains the wiper setting after power-down.
Do the AD5243BRMZ100 and AD5243BRM50 have the same temperature coefficient and tolerance?
No. The ratiometric temperature coefficient is typically 5 ppm/°C for both, but the end-to-end resistance tolerance and the absolute temperature coefficient can differ between the 50 kΩ and 100 kΩ versions. Designers should consult the respective datasheet specifications for the exact tolerance and tempco of each resistance option.
Which applications typically favor the AD5243BRMZ100 over the AD5243BRM50?
Applications requiring higher resistance to reduce power dissipation or to interface with higher-impedance signal chains may favor the AD5243BRMZ100. The AD5243BRM50 is often chosen when lower resistance is needed for higher current handling or to match a lower-impedance network. The choice depends on the specific circuit requirements and cannot be generalized without analysis.
Are the AD5243BRMZ100 and AD5243BRM50 RoHS compliant and lead-free?
Yes. Both the AD5243BRMZ100 and AD5243BRM50 are RoHS-compliant and lead-free, as indicated by the "Z" suffix in the part number, which denotes a lead-free, RoHS-compliant package.