MAX7645BC/D Equivalent & Substitute Parts

Part Overview

The MAX7645BC/D is a 12-bit digital-to-analog converter (DAC) manufactured by Analog Devices Inc./Maxim Integrated, supplied as a die (dice) component. This part is classified as obsolete, which necessitates identification of functionally equivalent alternatives for ongoing design requirements. The MAX7645BC/D features a single D/A converter with current output, external reference capability, and R-2R architecture suitable for data acquisition applications requiring 12-bit resolution and 1µs settling time.

Substiute Parts

MAX7645BC/D

Analog Devices Inc./Maxim IntegratedIn Stock: 1070MAX7645BC/D Datasheet

Current PartRFQ

MAX7645BCPP+

Analog Devices Inc./Maxim IntegratedIn Stock: 3157MAX7645BCPP+ Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the MAX7645BC/D is determined by equivalence in the following critical parameters:

• Resolution: 12-bit conversion capability
• Converter Count: Single D/A converter
• Output Configuration: Current output with unbuffered topology
• Interface: Parallel data interface
• Reference Architecture: External reference requirement
• Supply Voltage Range: 14.25V ~ 15.75V for both analog and digital supplies
• Linearity: INL/DNL specification of ±1 LSB maximum
• Settling Performance: 1µs settling time
• Architecture: R-2R resistor network topology

The MAX7645BCPP+ is identified as the manufacturer-recommended substitute. This part maintains functional equivalence through identical resolution, converter configuration, output type, interface protocol, and reference architecture. The primary distinction is packaging: the substitute is supplied in a 20-pin DIP tube package rather than die form, enabling direct integration into standard PCB assemblies.

Parameter Comparison

Engineering Selection Recommendations

The MAX7645BCPP+ is the appropriate substitute for the obsolete MAX7645BC/D based on the following factors:

Product Status: The MAX7645BC/D is classified as obsolete, creating supply chain risk. The MAX7645BCPP+ maintains active product status with confirmed inventory availability (3100 pieces), ensuring long-term procurement viability.

Functional Equivalence: Both parts share identical electrical specifications across all critical parameters: 12-bit resolution, 1µs settling time, R-2R architecture, external reference configuration, and ±1 LSB linearity performance. This equivalence ensures drop-in functional replacement without circuit redesign.

Compliance Alignment: Both parts maintain ROHS3 compliance and REACH unaffected status, satisfying regulatory requirements for new designs and legacy system updates.

Packaging Consideration: The transition from die form to 20-pin DIP packaging requires integration into a standard PCB footprint. This change eliminates the need for specialized die-attach and wire-bonding processes, reducing manufacturing complexity while maintaining electrical performance.

Frequently Asked Questions (FAQ)

Q: Can the MAX7645BCPP+ directly replace the MAX7645BC/D in existing designs?

A: Electrical replacement is direct due to identical specifications. Physical integration differs: the MAX7645BC/D is a bare die requiring die-attach and wire-bonding, while the MAX7645BCPP+ is a packaged 20-pin DIP component suitable for standard PCB assembly. Circuit board redesign is necessary to accommodate the DIP footprint.

Q: What are the key parameters that define substitution eligibility?

A: Substitution is valid when the following parameters match: 12-bit resolution, single D/A converter, current output topology, parallel interface, external reference requirement, 14.25V ~ 15.75V supply voltage range, ±1 LSB linearity, 1µs settling time, and R-2R architecture. The MAX7645BCPP+ satisfies all these criteria.

Q: Are there compliance differences between the two parts?

A: No. Both parts maintain ROHS3 compliance, REACH unaffected status, and MSL 1 (unlimited) moisture sensitivity rating. Regulatory requirements are equivalent.

Q: What is the significance of the product status change from obsolete to active?

A: Active product status indicates ongoing manufacturing and distribution support. This eliminates supply discontinuation risk and ensures availability for current and future procurement cycles, a critical factor for production designs.

Q: Does the packaging change affect electrical performance?

A: No. The 20-pin DIP package preserves all electrical characteristics specified for the die form. Performance metrics including settling time, linearity, and output impedance remain unchanged.