MAX502AENG Equivalent & Substitute Parts

Part Overview

The MAX502AENG is a 12-bit digital-to-analog converter (DAC) manufactured by Analog Devices Inc./Maxim Integrated, designed for data acquisition applications requiring voltage output conversion. This component features an R-2R architecture with external reference capability and operates across the temperature range of -40°C to 85°C. The MAX502AENG is classified as obsolete, making identification of suitable substitute components essential for ongoing system support and new design implementations.

Key Parameters

Parameter	Value
Resolution	12 Bit
Number of D/A Converters	1
Settling Time	5µs
Output Type	Voltage - Buffered
Data Interface	Parallel
Reference Type	External
Voltage - Supply, Analog	±11.4V ~ 15.75V
INL/DNL	±0.75 LSB (Max), ±1 LSB (Max)
Architecture	R-2R
Operating Temperature	-40°C ~ 85°C
Package / Case	24-DIP (0.300", 7.62mm)
Mounting Type	Through Hole

Substitute Part Grouping Explanation

Substitution eligibility for the MAX502AENG is determined by strict alignment across the following critical parameters: resolution (12-bit), converter count (1), settling time (5µs), output type (voltage-buffered), data interface (parallel), reference type (external), analog supply voltage range compatibility, INL/DNL specifications, R-2R architecture, operating temperature range, and physical package compatibility.

Two substitute components meet these criteria:

MAX502AENG+ — Direct functional equivalent with identical electrical specifications. Differs only in packaging format (tube vs. unspecified original) and product status (active vs. obsolete). RoHS3 compliance provides regulatory advantage over the original obsolete component.

AD7845BQ — Manufacturer-recommended alternative from Analog Devices Inc. Maintains all critical electrical parameters including 12-bit resolution, 5µs settling time, R-2R architecture, and parallel data interface. Package variant (24-CDIP vs. 24-DIP) requires mechanical verification for board compatibility. Analog supply voltage range (±14.25V ~ 15.75V) is narrower than the original (±11.4V ~ 15.75V), requiring confirmation that system supply voltages remain within this reduced window.

Parameter Comparison

Parameter	MAX502AENG (Original)	MAX502AENG+ (Direct Substitute)	AD7845BQ (MFR Recommended)
Manufacturer	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated	Analog Devices Inc.
Resolution	12 Bit	12 Bit	12 Bit
Number of D/A Converters	1	1	1
Settling Time	5µs	5µs	5µs
Output Type	Voltage - Buffered	Voltage - Buffered	Voltage - Buffered
Data Interface	Parallel	Parallel	Parallel
Reference Type	External	External	External
Voltage - Supply, Analog	±11.4V ~ 15.75V	±11.4V ~ 15.75V	±14.25V ~ 15.75V
INL/DNL (LSB)	±0.75 (Max), ±1 (Max)	±0.75 (Max), ±1 (Max)	±0.75 (Max), ±1 (Max)
Architecture	R-2R	R-2R	R-2R
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Package / Case	24-DIP (0.300", 7.62mm)	24-DIP (0.300", 7.62mm)	24-CDIP (0.300", 7.62mm)
Mounting Type	Through Hole	Through Hole	Through Hole
Product Status	Obsolete	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

MAX502AENG+ is the primary substitute for direct replacement applications. This component maintains identical electrical and mechanical specifications while offering active product status and ROHS3 compliance. Selection of MAX502AENG+ eliminates regulatory and supply chain risks associated with the obsolete original component.

AD7845BQ serves as an alternative when MAX502AENG+ availability is constrained. This manufacturer-recommended part provides equivalent functional performance and active status with ROHS3 compliance. The narrower analog supply voltage range (±14.25V ~ 15.75V vs. ±11.4V ~ 15.75V) requires verification that system power supplies operate within this specification window. The package variant (24-CDIP vs. 24-DIP) necessitates mechanical compatibility assessment for printed circuit board layout and socket accommodation.

Both substitute components carry identical ECCN (EAR99), HTSUS (8542.39.0001), and REACH compliance status as the original part.

Frequently Asked Questions (FAQ)

Q: Can MAX502AENG+ be used as a direct drop-in replacement for MAX502AENG?

A: Yes. MAX502AENG+ maintains identical electrical specifications, pin configuration, and 24-DIP package format. The component is functionally interchangeable with no circuit modifications required.

Q: What is the key difference between MAX502AENG+ and AD7845BQ?

A: Both components provide equivalent 12-bit DAC functionality with identical settling time and accuracy specifications. The primary differences are: (1) package variant (24-DIP vs. 24-CDIP), requiring mechanical verification for board compatibility, and (2) analog supply voltage range (AD7845BQ operates within ±14.25V ~ 15.75V, a narrower window than MAX502AENG+ at ±11.4V ~ 15.75V).

Q: Is the 24-CDIP package compatible with 24-DIP sockets?

A: 24-DIP and 24-CDIP packages share identical pin spacing (0.300", 7.62mm) and through-hole mounting. Physical compatibility depends on socket design specifications. Verify socket documentation for ceramic (CDIP) vs. plastic (DIP) package accommodation.

Q: Are both substitute parts RoHS compliant?

A: Yes. Both MAX502AENG+ and AD7845BQ are ROHS3 compliant, providing regulatory advantage over the RoHS non-compliant original MAX502AENG.

Q: What supply voltage range must be verified when considering AD7845BQ?

A: AD7845BQ operates within an analog supply voltage range of ±14.25V ~ 15.75V. Confirm that system power supplies remain within this specification. The original MAX502AENG supports a wider range (±11.4V ~ 15.75V). If system supplies operate below ±14.25V, AD7845BQ is not suitable.

Q: Are there any differences in settling time or accuracy between the substitutes?

A: No. All three components (MAX502AENG, MAX502AENG+, and AD7845BQ) share identical 5µs settling time and INL/DNL specifications (±0.75 LSB max, ±1 LSB max).

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