MAX516AENG Equivalent & Substitute Parts

Part Overview

The MAX516AENG is a 4-channel general-purpose comparator manufactured by Analog Devices Inc./Maxim Integrated, packaged in 24-DIP through-hole configuration. This device operates with CMOS and TTL output types across a supply voltage range of 4.75V to 16.5V. The MAX516AENG is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production support. Substitute comparators must maintain functional equivalence in channel count, output compatibility, and operating voltage specifications while accommodating different package formats and mounting technologies.

Key Parameters

Parameter	MAX516AENG
Manufacturer	Analog Devices Inc./Maxim Integrated
Number of Elements	4
Output Type	CMOS, TTL
Voltage - Supply, Single/Dual (±)	4.75V ~ 16.5V
Current - Input Bias (Max)	0.3µA @ 16.5V
Current - Quiescent (Max)	10mA
Propagation Delay (Max)	1.5µs
Operating Temperature	-40°C ~ 85°C
Package / Case	24-DIP (0.300", 7.62mm)
Mounting Type	Through Hole
Product Status	Obsolete
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution of the MAX516AENG is determined by the following critical parameters:

Channel Count: All substitutes maintain 4 independent comparator elements
Output Type Compatibility: Substitutes support CMOS, TTL, or Open-Collector output configurations, which are functionally compatible with the original CMOS/TTL outputs
Supply Voltage Range: Substitute parts must operate within overlapping voltage ranges; the MAX516AENG operates 4.75V–16.5V, while substitutes operate from 2V–36V or 3V–36V, providing full coverage
Input Bias Current: Substitute specifications (0.1µA–0.25µA) are within acceptable limits relative to the original 0.3µA specification
Quiescent Current: Substitute devices (2mA–2.5mA) operate at lower power consumption than the original 10mA specification
Operating Temperature: Substitutes cover the original -40°C to 85°C range, with many extending to 125°C
Package Format: While the original uses 24-DIP through-hole, substitutes are available in 14-pin surface-mount packages (SOIC, TSSOP, QFN) and 14-pin through-hole (CDIP), requiring PCB redesign but offering modern manufacturing advantages

Substitutes are grouped by package type and product status (active vs. obsolete) to facilitate selection based on manufacturing requirements.

Parameter Comparison

Parameter	MAX516AENG	LM139AJ/PB	LM239APT	LM239DR2G	LM239DTBR2G	LM239QT	LM2901DT	LM2901MX	LM2901MX/NOPB	LM2901PT	LM2901YDT
Manufacturer	Analog Devices	Texas Instruments	STMicroelectronics	onsemi	onsemi	STMicroelectronics	STMicroelectronics	onsemi	Texas Instruments	STMicroelectronics	STMicroelectronics
Number of Elements	4	4	4	4	4	4	4	4	4	4	4
Output Type	CMOS, TTL	Open-Collector, Open-Drain	CMOS, DTL, ECL, MOS, Open-Collector, TTL	CMOS, Open-Collector, TTL	CMOS, Open-Collector, TTL	CMOS, DTL, ECL, MOS, Open-Collector, TTL	CMOS, DTL, ECL, MOS, Open-Collector, TTL	DTL, MOS, Open-Collector, TTL	Open-Collector	CMOS, DTL, ECL, MOS, Open-Collector, TTL	CMOS, DTL, ECL, MOS, Open-Collector, TTL
Voltage - Supply (Min-Max)	4.75V ~ 16.5V	2V ~ 36V, ±1V ~ 18V	2V ~ 32V, ±1V ~ 16V	3V ~ 36V, ±1.5V ~ 18V	3V ~ 36V, ±1.5V ~ 18V	2V ~ 36V, ±1V ~ 18V	2V ~ 32V, ±1V ~ 16V	2V ~ 36V, ±1V ~ 18V	2V ~ 36V, ±1V ~ 18V	2V ~ 32V, ±1V ~ 16V	2V ~ 32V, ±1V ~ 16V
Current - Input Bias (Max)	0.3µA @ 16.5V	0.1µA @ 5V	0.1µA @ 5V	0.25µA @ 5V	0.25µA @ 5V	0.25µA @ 5V	0.25µA @ 5V	0.25µA @ 5V	0.25µA @ 5V	0.25µA @ 5V	0.25µA @ 5V
Current - Quiescent (Max)	10mA	2.5mA	2mA	2.5mA	2.5mA	2mA	2.5mA	2.5mA	2.5mA	2.5mA	2.5mA
Operating Temperature	-40°C ~ 85°C	-55°C ~ 125°C	-40°C ~ 105°C	-25°C ~ 85°C	-25°C ~ 85°C	-40°C ~ 105°C	-40°C ~ 125°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 125°C	-40°C ~ 125°C
Package / Case	24-DIP (0.300", 7.62mm)	14-CDIP (0.300", 7.62mm)	14-TSSOP (0.173", 4.40mm)	14-SOIC (0.154", 3.90mm)	14-TSSOP (0.173", 4.40mm)	16-VFQFN Exposed Pad	14-SOIC (0.154", 3.90mm)	14-SOIC (0.154", 3.90mm)	14-SOIC (0.154", 3.90mm)	14-TSSOP (0.173", 4.40mm)	14-SOIC (0.154", 3.90mm)
Mounting Type	Through Hole	Through Hole	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Obsolete	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For Through-Hole PCB Designs (Direct Package Compatibility)

The LM139AJ/PB from Texas Instruments is the only substitute available in 14-CDIP through-hole package format. This part maintains through-hole mounting compatibility, though it requires PCB redesign due to different pin count (14 vs. 24). The LM139AJ/PB is active and ROHS3 compliant, providing long-term availability and regulatory compliance advantages over the obsolete MAX516AENG.

For Surface-Mount PCB Designs (Recommended for New Designs)

Surface-mount substitutes offer superior manufacturing efficiency and are recommended for new product development. Selection depends on specific package requirements:

14-SOIC Package: LM239DR2G (onsemi), LM2901DT (STMicroelectronics), LM2901MX/NOPB (Texas Instruments), and LM2901YDT (STMicroelectronics) provide high inventory availability and active product status. The LM2901YDT includes AEC-Q100 automotive qualification for applications requiring automotive-grade components.
14-TSSOP Package: LM239APT (STMicroelectronics), LM239DTBR2G (onsemi), and LM2901PT (STMicroelectronics) offer compact form factors suitable for space-constrained designs.
16-QFN Package: LM239QT (STMicroelectronics) provides the smallest footprint with exposed pad thermal management, suitable for high-density applications.

Compliance and Availability Considerations

All recommended substitutes are ROHS3 compliant, addressing the non-compliance status of the obsolete MAX516AENG. Inventory levels are substantial across all substitutes, with LM239DR2G (105,400 pcs) and LM2901DT (185,200 pcs) offering the highest stock levels. For applications requiring extended temperature operation beyond -40°C to 85°C, LM139AJ/PB (-55°C to 125°C), LM239APT (-40°C to 105°C), LM2901DT (-40°C to 125°C), LM2901PT (-40°C to 125°C), and LM2901YDT (-40°C to 125°C) provide expanded operating ranges.

Frequently Asked Questions (FAQ)

Q: Can I directly replace MAX516AENG with any of these substitutes without PCB modification?

A: No. The MAX516AENG uses a 24-DIP package, while most substitutes use 14-pin packages (SOIC, TSSOP, QFN, or CDIP). Only the LM139AJ/PB maintains through-hole mounting in a 14-CDIP package, but this still requires PCB redesign due to different pin count and pinout. Surface-mount alternatives require PCB layout changes but offer modern manufacturing advantages.

Q: What is the key difference between Open-Collector and CMOS/TTL outputs?

A: Open-Collector outputs require external pull-up resistors to establish logic levels, providing flexibility in interfacing with different voltage domains. CMOS and TTL outputs provide direct logic-level outputs without external components. The MAX516AENG supports CMOS and TTL outputs, while substitutes offer Open-Collector variants that are functionally compatible when properly configured with pull-up resistors.

Q: Are all substitutes compatible with the original 4.75V to 16.5V supply voltage range?

A: Yes. All substitutes operate across supply ranges that encompass or exceed the original 4.75V to 16.5V specification. The LM139AJ/PB operates 2V–36V (±1V–18V), LM239 variants operate 2V–32V or 2V–36V, and LM2901 variants operate 2V–36V or 2V–32V, all providing full coverage of the original range.

Q: Which substitute offers the best long-term availability?

A: LM2901DT (STMicroelectronics) and LM239DR2G (onsemi) are recommended for long-term availability due to active product status, high inventory levels (185,200 and 105,400 pcs respectively), ROHS3 compliance, and established manufacturing processes. These parts are widely used in industrial applications and supported by multiple distributors.

Q: Can I use the LM2901YDT in non-automotive applications?

A: Yes. The LM2901YDT is AEC-Q100 qualified for automotive applications but functions identically to non-automotive variants in standard applications. Its automotive qualification provides additional process control and reliability assurance, making it suitable for any application requiring high reliability.

Q: What is the impact of different quiescent current specifications?

A: The MAX516AENG draws 10mA quiescent current, while substitutes draw 2mA–2.5mA. This represents a 75–80% reduction in standby power consumption, providing significant advantages in battery-powered or power-sensitive applications. All substitutes are functionally compatible despite this difference.

Q: Which package format should I choose for a new design?

A: For new designs, surface-mount packages (SOIC, TSSOP, or QFN) are recommended over through-hole formats. The 14-SOIC package (LM239DR2G, LM2901DT, LM2901MX/NOPB, LM2901YDT) offers the best balance of availability, cost, and manufacturing compatibility. The 14-TSSOP package provides a more compact footprint, while the 16-QFN offers the smallest area for space-constrained applications.

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