AP393NL-U Equivalent & Substitute Parts

Part Overview

The AP393NL-U is a dual comparator IC manufactured by Diodes Incorporated in 8-DIP through-hole packaging. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The AP393NL-U functions as a general-purpose comparator with open-collector output configuration, suitable for voltage comparison and signal conditioning applications across industrial and consumer electronics.

Key Parameters

Parameter	Value
Manufacturer	Diodes Incorporated
Part Number	AP393NL-U
Category	Linear Comparator
Package Type	8-DIP (0.300", 7.62mm)
Mounting Type	Through Hole
Number of Elements	2
Output Type	Open-Collector
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the AP393NL-U is determined by the following critical parameters:

Functional equivalence: Dual comparator with general-purpose open-collector output
Package compatibility: 8-DIP through-hole form factor (primary criterion for direct board-level replacement)
Electrical specifications: Supply voltage range 2V–36V (single) or ±1V–18V (dual), input offset voltage ≤5mV, input bias current ≤0.25µA, output current ≥16mA
Compliance requirements: ROHS3 compliance and REACH unaffected status
Thermal performance: Operating temperature range -40°C to 85°C or wider

Substitute parts are grouped into two categories:

Direct 8-DIP replacements (AS393P-E1, LM393N/NOPB, LM293P, LM193AH, LM193H): Maintain identical through-hole package footprint for direct PCB substitution without layout modification.
Alternative package options (LM193DT, LM2903AVQPWR, LM2903AVQPWRG4Q1, LM2903AVQPWRQ1, LM2903D): Surface-mount variants offering improved thermal characteristics and manufacturing flexibility, requiring PCB redesign.

Parameter Comparison

Part Number	Manufacturer	Package	Mounting	Supply Voltage	Input Offset (Max)	Input Bias (Max)	Output Current (Typ)	Quiescent Current (Max)	Operating Temp	Product Status
AP393NL-U	Diodes Inc.	8-DIP	Through Hole	2V–36V / ±1V–18V	5mV @ 5V	0.25µA @ 5V	16mA @ 5V	1mA	-40°C to 85°C	Obsolete
AS393P-E1	Diodes Inc.	8-DIP	Through Hole	2V–36V / ±1V–18V	5mV @ 5V	0.25µA @ 5V	16mA @ 5V	1mA	-40°C to 85°C	Active
LM393N/NOPB	Texas Instruments	8-DIP	Through Hole	2V–36V / ±1V–18V	5mV @ 30V	0.25µA @ 5V	16mA @ 5V	2.5mA	0°C to 70°C	Active
LM293P	Texas Instruments	8-DIP	Through Hole	2V–36V / ±1V–18V	5mV @ 30V	0.25µA @ 5V	20mA	2.5mA	-25°C to 85°C	Active
LM193AH	Texas Instruments	TO-99-8	Through Hole	2V–36V / ±1V–18V	2mV @ 30V	0.1µA @ 5V	16mA @ 5V	2.5mA	-55°C to 125°C	Active
LM193DT	STMicroelectronics	8-SOIC	Surface Mount	2V–36V / ±1V–18V	5mV @ 30V	0.25µA @ 5V	18mA @ 5V	2.5mA	-55°C to 125°C	Active
LM193H	National Semiconductor	TO-99-8	Through Hole	2V–36V / ±1V–18V	5mV @ 30V	0.1µA @ 5V	16mA @ 5V	2.5mA	-55°C to 125°C	Active
LM2903AVQPWR	Texas Instruments	8-TSSOP	Surface Mount	2V–36V / ±1V–18V	2mV @ 5V	0.25µA @ 5V	20mA	2.5mA	-40°C to 125°C	Active
LM2903AVQPWRG4Q1	Texas Instruments	8-TSSOP	Surface Mount	2V–36V / ±1V–18V	2mV @ 5V	0.25µA @ 5V	20mA	2.5mA	-40°C to 125°C	Active
LM2903AVQPWRQ1	Texas Instruments	8-TSSOP	Surface Mount	2V–36V / ±1V–18V	2mV @ 5V	0.25µA @ 5V	20mA	2.5mA	-40°C to 125°C	Active
LM2903D	STMicroelectronics	8-SOIC	Surface Mount	2V–36V / ±1V–18V	7mV @ 5V	0.25µA @ 5V	16mA @ 5V	2.5mA	-40°C to 125°C	Active

Engineering Selection Recommendations

For direct PCB replacement without layout modification:

AS393P-E1 is the primary equivalent, offering identical 8-DIP package geometry and electrical performance from the same manufacturer (Diodes Incorporated). This part maintains full compatibility with existing through-hole designs and carries active product status with ROHS3 compliance.

LM393N/NOPB (Texas Instruments) and LM293P (Texas Instruments) provide 8-DIP alternatives with active status and ROHS3 compliance. LM293P offers improved output current capability (20mA vs. 16mA) and extended lower operating temperature range (-25°C vs. -40°C minimum), suitable for applications requiring higher drive capability.

For designs permitting package change:

LM193AH and LM193H (TO-99-8 through-hole metal can) maintain through-hole mounting while offering superior input offset voltage (2mV vs. 5mV) and extended operating temperature range (-55°C to 125°C). These are suitable for precision applications with thermal requirements beyond standard industrial range.

LM193DT (STMicroelectronics, 8-SOIC surface mount) and LM2903 variants (Texas Instruments, 8-TSSOP surface mount) enable PCB miniaturization with improved thermal performance. LM2903AVQPWRG4Q1 and LM2903AVQPWRQ1 include automotive-grade qualification (AEC-Q100) for applications requiring automotive reliability standards.

All substitute parts maintain ROHS3 compliance and REACH unaffected status, matching the original part's environmental certification requirements.

Frequently Asked Questions (FAQ)

Q: Can AS393P-E1 replace AP393NL-U directly on the PCB?

A: Yes. AS393P-E1 shares identical 8-DIP package dimensions (0.300", 7.62mm), pin configuration, and electrical specifications. No PCB modification is required for direct substitution.

Q: What is the difference between 8-DIP, TO-99-8, 8-SOIC, and 8-TSSOP packages?

A: 8-DIP and TO-99-8 are through-hole packages suitable for existing through-hole PCB designs. 8-SOIC and 8-TSSOP are surface-mount packages requiring SMD-compatible PCB layouts. 8-DIP uses 0.300" lead spacing; TO-99-8 is a metal can format; 8-SOIC and 8-TSSOP are compact surface-mount options with improved thermal characteristics.

Q: Why does LM393N/NOPB show 0°C to 70°C operating temperature while AP393NL-U supports -40°C to 85°C?

A: Operating temperature range is a specified parameter that varies by manufacturer and product grade. LM393N/NOPB's narrower range (-40°C to 85°C is not available in this variant) may limit use in extended-temperature applications. Verify temperature requirements against your design specifications before selection.

Q: Are LM2903AVQPWRG4Q1 and LM2903AVQPWRQ1 interchangeable?

A: Both parts are functionally equivalent with identical electrical specifications and 8-TSSOP packaging. The primary difference is qualification level: G4Q1 includes automotive-grade AEC-Q100 qualification, while Q1 also includes automotive qualification. Selection depends on application requirements and supply chain availability.

Q: Can I use a surface-mount part (8-SOIC or 8-TSSOP) as a direct replacement for the through-hole 8-DIP package?

A: No. Surface-mount packages require different PCB footprints, soldering processes, and assembly equipment. Use surface-mount alternatives only if your PCB design and manufacturing process support SMD assembly.

Q: What does ROHS3 compliance mean for this part?

A: ROHS3 (Restriction of Hazardous Substances Directive 3) compliance indicates the part meets EU environmental standards restricting lead, cadmium, mercury, and other hazardous substances. All listed substitute parts maintain ROHS3 compliance, ensuring regulatory compatibility.

Q: Which substitute offers the best input offset voltage performance?

A: LM193AH and LM2903AVQPWR variants offer 2mV maximum input offset voltage at specified conditions, compared to 5mV–7mV for other options. Lower offset voltage improves precision in voltage comparison applications.

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