DS3903E Digital Potentiometer Equivalent & Substitute Parts

Part Overview

The DS3903E is a digital potentiometer IC manufactured by Analog Devices Inc./Maxim Integrated, designed for data acquisition applications. This component features a 3-circuit configuration with 128 taps, supporting 10kΩ and 90kΩ resistance values through an I2C interface. The DS3903E is classified as obsolete, which necessitates identification of active equivalent parts for new designs and ongoing production requirements.

Substiute Parts

DS3903E

Analog Devices Inc./Maxim IntegratedIn Stock: 877DS3903E Datasheet

Current PartRFQ

DS3903E-020+

Analog Devices Inc./Maxim IntegratedIn Stock: 1347DS3903E-020+ Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the DS3903E is determined by strict equivalence across the following critical parameters:

• Resistance configuration: 10kΩ and 90kΩ dual values
• Circuit count: 3 independent potentiometer circuits
• Tap resolution: 128 taps per circuit
• Interface protocol: I2C communication standard
• Non-volatile memory retention
• Supply voltage range: 2.7V to 5.5V compatibility
• Package form factor: 20-TSSOP surface mount
• Operating temperature range: -40°C to 85°C
• Electrical characteristics: ±20% tolerance, ±300ppm/°C temperature coefficient, 250Ω wiper resistance

The DS3903E-020+ meets all these parameters and is manufactured by the same supplier, Analog Devices Inc./Maxim Integrated, ensuring functional and electrical compatibility.

Parameter Comparison

Engineering Selection Recommendations

The DS3903E-020+ is the direct functional equivalent of the DS3903E. Both parts share identical electrical specifications, pin configurations, and performance characteristics across all critical parameters. The primary distinction is product lifecycle status: the DS3903E is obsolete, while the DS3903E-020+ is active and available in production quantities.

The DS3903E-020+ offers improved compliance status, meeting ROHS3 requirements compared to the non-compliant DS3903E. This substitution is appropriate for new designs, production restocking, and end-of-life replacement scenarios where the obsolete DS3903E is no longer available through standard distribution channels.

Frequently Asked Questions (FAQ)

Q: Are DS3903E and DS3903E-020+ pin-compatible?

A: Yes. Both parts use the 20-TSSOP package with identical pinout and electrical interface specifications.

Q: Can DS3903E-020+ replace DS3903E in existing designs?

A: Yes. The DS3903E-020+ is a direct substitute with identical functional and electrical parameters, including I2C interface, resistance values, tap count, and operating ranges.

Q: What is the difference between DS3903E and DS3903E-020+?

A: The primary differences are product status (obsolete vs. active) and RoHS compliance (non-compliant vs. ROHS3 compliant). Electrical and functional specifications are identical.

Q: Does the packaging difference affect compatibility?

A: No. The packaging designation (Tube for DS3903E-020+) refers to the distribution format only and does not affect component functionality or PCB integration.

Q: Are there supply voltage or temperature range limitations when substituting?

A: No. Both parts operate across the identical supply voltage range (2.7V to 5.5V) and temperature range (-40°C to 85°C).

Q: Is the I2C interface identical between both parts?

A: Yes. Both parts implement the same I2C protocol with selectable address features and non-volatile memory retention.