AP393NG-U Equivalent & Substitute Parts

Part Overview

The AP393NG-U is a dual general-purpose comparator manufactured by Diodes Incorporated in 8-DIP through-hole packaging. This device is classified as obsolete, making equivalent and substitute parts necessary for new designs and production continuity. The AP393NG-U operates across a wide supply voltage range (2V to 36V single supply, ±1V to ±18V dual supply) and features multiple output types including CMOS, DTL, ECL, MOS, open-collector, and TTL configurations. Substitute parts must maintain functional equivalence in comparator topology, electrical performance, and package compatibility while meeting current product availability and compliance requirements.

Key Parameters

Parameter	AP393NG-U
Manufacturer	Diodes Incorporated
Product Status	Obsolete
Package Type	8-DIP (0.300", 7.62mm)
Mounting Type	Through Hole
Number of Elements	2
Output Type	CMOS, DTL, ECL, MOS, Open-Collector, TTL
Voltage Supply (Single/Dual)	2V ~ 36V, ±1V ~ 18V
Input Offset Voltage (Max)	5mV @ 3V
Input Bias Current (Max)	0.25µA @ 5V
Output Current (Typ)	16mA @ 5V
Quiescent Current (Max)	2.5mA
Operating Temperature	0°C ~ 70°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the AP393NG-U is determined by the following critical parameters:

Functional Requirements:

Dual comparator topology (2 independent comparators per package)
General-purpose comparator classification
Open-collector output capability

Electrical Compatibility:

Supply voltage range: minimum 2V to 36V single supply or ±1V to ±18V dual supply
Input offset voltage: 5mV or better at specified test conditions
Input bias current: 0.25µA or better
Output current capability: 16mA or greater
Quiescent current: 2.5mA or less

Package Compatibility:

Primary substitute: 8-DIP through-hole package (pin-for-pin compatible)
Secondary substitutes: 8-SOIC, 8-MSOP surface-mount packages (functional equivalence, different mounting)

Compliance Requirements:

ROHS3 compliance mandatory
REACH unaffected status required

Substitute parts meeting these criteria are functionally equivalent and can replace the AP393NG-U in applications where the specified electrical and mechanical parameters are satisfied.

Parameter Comparison

Parameter	AP393NG-U	LM293P	LM2903N/NOPB	LM2903P	LM2903PSR	LM2903QDGKRQ1	LM2903QDRQ1
Manufacturer	Diodes Inc.	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments
Product Status	Obsolete	Active	Active	Active	Active	Active	Active
Package Type	8-DIP	8-DIP	8-DIP	8-DIP	8-SOIC	8-TSSOP/MSOP	8-SOIC
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Surface Mount	Surface Mount	Surface Mount
Number of Elements	2	2	2	2	2	2	2
Output Type	CMOS, DTL, ECL, MOS, Open-Collector, TTL	Open-Collector, Open-Drain, Rail-to-Rail	Open-Collector, Rail-to-Rail	Open-Collector, Rail-to-Rail	Open-Collector, Rail-to-Rail	Open-Collector, Rail-to-Rail	Open-Collector, Rail-to-Rail
Voltage Supply (Single/Dual)	2V ~ 36V, ±1V ~ 18V	2V ~ 36V, ±1V ~ 18V	2V ~ 36V, ±1V ~ 18V	2V ~ 36V, ±1V ~ 18V	2V ~ 36V, ±1V ~ 18V	2V ~ 30V, ±1V ~ 15V	2V ~ 36V, ±1V ~ 18V
Input Offset Voltage (Max)	5mV @ 3V	5mV @ 30V	7mV @ 30V	7mV @ 30V	7mV @ 30V	7mV @ 5V	7mV @ 5V
Input Bias Current (Max)	0.25µA @ 5V	0.25µA @ 5V	0.25µA @ 5V	0.25µA @ 5V	0.25µA @ 5V	0.25µA @ 5V	0.25µA @ 5V
Output Current (Typ)	16mA @ 5V	20mA	16mA @ 5V	20mA	20mA	6mA @ 5V	20mA
Quiescent Current (Max)	2.5mA	2.5mA	2.5mA	2.5mA	2.5mA	1mA	2.5mA
Operating Temperature	0°C ~ 70°C	-25°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

Through-Hole Package Substitutes (Pin-for-Pin Compatible):

LM293P and LM2903N/NOPB are direct pin-for-pin replacements for the AP393NG-U in 8-DIP through-hole configuration. Both are active products from Texas Instruments with ROHS3 compliance and REACH unaffected status. LM2903N/NOPB offers extended operating temperature range (-40°C to 85°C) compared to the original specification (0°C to 70°C), providing improved thermal performance for demanding applications. LM2903P extends the upper operating temperature to 125°C, suitable for high-temperature environments.

Surface-Mount Package Substitutes (Functional Equivalence):

LM2903PSR (8-SOIC), LM2903QDGKRQ1 (8-TSSOP/MSOP), and LM2903QDRQ1 (8-SOIC) provide functional equivalence with surface-mount packaging. These require PCB layout redesign but offer reduced board space and improved thermal characteristics. LM2903QDGKRQ1 includes automotive-grade qualification (AEC-Q100) with reduced quiescent current (1mA) and output current (6mA), suitable for power-sensitive automotive applications. LM2903QDRQ1 also carries automotive qualification with full output current capability (20mA).

All recommended substitutes maintain the dual comparator topology, open-collector output configuration, and electrical parameter compatibility required for functional replacement of the AP393NG-U.

Frequently Asked Questions (FAQ)

Q: Can LM2903 series parts directly replace the AP393NG-U?

A: Yes, LM2903 series comparators are functionally equivalent to the AP393NG-U. Pin-for-pin compatible 8-DIP packages (LM2903N/NOPB, LM2903P, LM293P) provide direct replacement without PCB modification. Surface-mount variants require layout redesign but maintain electrical equivalence.

Q: What is the key difference between through-hole and surface-mount substitutes?

A: Through-hole packages (8-DIP) mount vertically through PCB holes and are compatible with existing AP393NG-U board designs without modification. Surface-mount packages (8-SOIC, 8-TSSOP/MSOP) require PCB redesign and specialized assembly equipment but offer reduced board space and improved thermal performance.

Q: Are automotive-grade substitutes necessary for standard industrial applications?

A: Automotive-grade parts (LM2903QDGKRQ1, LM2903QDRQ1) with AEC-Q100 qualification are not required for standard industrial applications. Standard-grade LM2903 variants meet all electrical and compliance requirements for general-purpose comparator applications. Automotive-grade selection is appropriate only when AEC-Q100 qualification is specified in design requirements.

Q: What is the significance of extended operating temperature ranges in substitute parts?

A: Extended operating temperature ranges (-40°C to 125°C in LM2903P versus 0°C to 70°C in AP393NG-U) provide design margin for applications subject to temperature extremes. Selection depends on actual application thermal environment. Standard temperature range parts are sufficient for controlled indoor environments.

Q: How do output current specifications affect substitute selection?

A: Output current capability determines maximum load-driving capacity. The AP393NG-U specifies 16mA at 5V. Most LM2903 substitutes provide 20mA, offering improved drive capability. LM2903QDGKRQ1 provides only 6mA and is suitable only for high-impedance loads or applications with external output buffering.

Q: Is RoHS3 compliance maintained across all substitute parts?

A: Yes, all recommended substitute parts maintain ROHS3 compliance and REACH unaffected status, meeting environmental and regulatory requirements equivalent to the original AP393NG-U specification.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message