MAX1240CESA+ Equivalent & Substitute Parts

Part Overview

The MAX1240CESA+ is a 12-bit analog-to-digital converter manufactured by Analog Devices Inc./Maxim Integrated, designed for single-ended input data acquisition applications. This device features a successive approximation register (SAR) architecture with SPI serial interface, operating from 2.7V to 3.6V supply voltage across both analog and digital domains. The MAX1240CESA+ is classified as obsolete, making equivalent substitute parts necessary for ongoing production and design continuity. Active alternatives within the MAX1240 product family provide identical electrical and mechanical specifications while maintaining current manufacturing status and availability.

Key Parameters

Parameter	Specification
Resolution	12 Bits
Sampling Rate	73 kSPS
Number of Inputs	1
Input Type	Single Ended
Data Interface	SPI
Architecture	SAR
Reference Type	External, Internal
Analog Supply Voltage	2.7V ~ 3.6V
Digital Supply Voltage	2.7V ~ 3.6V
Operating Temperature Range	-40°C ~ 85°C
Package Type	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the MAX1240CESA+ is determined by strict equivalence across all electrical and mechanical parameters. The substitute parts maintain identical specifications in the following critical areas:

12-bit resolution and 73 kSPS sampling rate
Single-ended input configuration with SPI serial interface
SAR architecture with external and internal reference capability
2.7V to 3.6V supply voltage range for both analog and digital domains
Operating temperature range of -40°C to 85°C
8-SOIC surface mount package with 0.154" (3.90mm) width
ROHS3 compliance and MSL 1 rating

All substitute parts are manufactured by Analog Devices Inc./Maxim Integrated under the MAX1240 base product number. The primary distinction between the main part and substitutes is product status: the MAX1240CESA+ is obsolete, while all listed substitutes maintain active production status.

Parameter Comparison

Part Number	Manufacturer	Product Status	Resolution (Bits)	Sampling Rate (kSPS)	Inputs	Data Interface	Supply Voltage (V)	Operating Temp (°C)	Package	RoHS Status
MAX1240CESA+	Analog Devices Inc./Maxim Integrated	Obsolete	12	73	1	SPI	2.7 ~ 3.6	-40 ~ 85	8-SOIC	ROHS3 Compliant
MAX1240AESA+	Analog Devices Inc./Maxim Integrated	Active	12	73	1	SPI	2.7 ~ 3.6	-40 ~ 85	8-SOIC	ROHS3 Compliant
MAX1240AESA/V+	Analog Devices Inc./Maxim Integrated	Active	12	73	1	SPI	2.7 ~ 3.6	-40 ~ 85	8-SOIC	ROHS3 Compliant
MAX1240BESA+	Analog Devices Inc./Maxim Integrated	Active	12	73	1	SPI	2.7 ~ 3.6	-40 ~ 85	8-SOIC	ROHS3 Compliant
MAX1240BESA/V+	Analog Devices Inc./Maxim Integrated	Active	12	73	1	SPI	2.7 ~ 3.6	-40 ~ 85	8-SOIC	ROHS3 Compliant

Engineering Selection Recommendations

The MAX1240CESA+ is classified as obsolete and should be replaced with an active equivalent for new designs and production continuity. All four substitute parts—MAX1240AESA+, MAX1240AESA/V+, MAX1240BESA+, and MAX1240BESA/V+—are functionally equivalent and maintain active product status with current manufacturing support.

Selection among the active substitutes should be based on packaging and supply chain requirements. Parts designated with "+" suffix are supplied in tube packaging, while parts with "/V+" designation indicate alternative packaging configurations. All substitutes carry ROHS3 compliance and MSL 1 rating, meeting environmental and moisture sensitivity requirements identical to the original part.

Inventory availability varies across substitute options, with MAX1240BESA/V+ offering the highest stock level at 2,200 pieces. For applications requiring immediate component availability, MAX1240BESA/V+ or MAX1240BESA+ are recommended. For long-term supply assurance, any active substitute maintains equivalent electrical performance and mechanical compatibility.

Frequently Asked Questions (FAQ)

Q: Can MAX1240AESA+ be used as a direct replacement for MAX1240CESA+?

A: Yes. The MAX1240AESA+ is a parametric equivalent with identical electrical specifications, operating characteristics, and 8-SOIC package configuration. The primary difference is product status: MAX1240AESA+ is active while MAX1240CESA+ is obsolete.

Q: What is the difference between MAX1240AESA+ and MAX1240BESA+?

A: Both parts are parametric equivalents with identical electrical and mechanical specifications. The letter designation (A vs. B) indicates different manufacturing grades or process revisions within the MAX1240 product family, but all electrical parameters remain unchanged.

Q: Does the "/V+" suffix affect compatibility?

A: No. The "/V+" designation indicates alternative packaging configuration but does not affect electrical performance or pin compatibility. Parts with "/V+" suffix are mechanically and electrically equivalent to their "+" counterparts.

Q: Are all substitutes ROHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance and MSL 1 rating, matching the environmental and moisture sensitivity specifications of the MAX1240CESA+.

Q: Can these parts be used interchangeably on the same PCB?

A: Yes. All substitute parts share identical pin configuration, package dimensions (8-SOIC, 0.154" width), and surface mount footprint. No PCB redesign is required for substitution.

Q: Which substitute part should be selected for new production?

A: Any active substitute (MAX1240AESA+, MAX1240AESA/V+, MAX1240BESA+, or MAX1240BESA/V+) is suitable for new production. Selection should be based on packaging preference and inventory availability. All maintain equivalent performance and current manufacturing support.

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