TLC372QDRG4 Equivalent & Substitute Parts

Part Overview

The TLC372QDRG4 is a dual differential comparator IC manufactured by Texas Instruments in the LinCMOS™ series, housed in an 8-SOIC surface mount package. This component features CMOS, MOS, open-drain, and TTL output configurations suitable for precision voltage comparison applications. The part is currently classified as obsolete, making identification of equivalent and substitute components essential for ongoing design support and production continuity. Active alternatives with matching or superior electrical characteristics are available from Texas Instruments and other manufacturers.

Key Parameters

Parameter	Value
Type	Differential Comparator
Number of Elements	2
Output Type	CMOS, MOS, Open-Drain, TTL
Voltage Supply Range (Single/Dual)	4V ~ 16V, ±2V ~ 8V
Input Offset Voltage (Max)	5mV @ 5V
Input Bias Current (Max)	5pA @ 5V
Output Current (Typ)	20mA
Quiescent Current (Max)	300µA
Operating Temperature	-40°C ~ 125°C
Package	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the TLC372QDRG4 is determined by the following critical parameters:

Package Compatibility: All substitute parts must use the 8-SOIC surface mount package with identical 0.154" (3.90mm) width to ensure PCB footprint compatibility without layout modifications.

Electrical Characteristics: Substitute parts must maintain functional equivalence in supply voltage range, output type configuration, and current handling capabilities. The dual differential comparator topology with 2 elements is a fundamental requirement.

Output Configuration: The CMOS, MOS, open-drain, and TTL output types define the interface requirements. Substitute parts must support these output modes or provide compatible alternatives.

Temperature Range: Operating temperature specifications must encompass the -40°C ~ 125°C range or be suitable for the intended application environment.

Compliance Standards: All substitute parts must maintain ROHS3 compliance and MSL 1 rating to ensure manufacturing process compatibility and moisture sensitivity alignment.

Parameter Comparison

Parameter	TLC372QDRG4 (Main)	TLC372QDR	NCS3402DR2G	TS372CDT	TS372IDT
Manufacturer	Texas Instruments	Texas Instruments	onsemi	STMicroelectronics	STMicroelectronics
Product Status	Obsolete	Active	Active	Active	Active
Type	Differential	Differential	General Purpose	Differential	Differential
Number of Elements	2	2	2	2	2
Output Type	CMOS, MOS, Open-Drain, TTL	CMOS, MOS, Open-Drain, TTL	Open-Drain	CMOS, MOS, Open-Drain, TTL	CMOS, MOS, Open-Drain, TTL
Voltage Supply Range	4V ~ 16V, ±2V ~ 8V	4V ~ 16V, ±2V ~ 8V	2.5V ~ 16V	3V ~ 16V, ±1.5V ~ 8V	3V ~ 16V, ±1.5V ~ 8V
Input Offset Voltage (Max)	5mV @ 5V	5mV @ 5V	3.6mV @ 15V	10mV @ 5V	10mV @ 5V
Input Bias Current (Max)	5pA @ 5V	5pA @ 5V	250pA @ 15V	1pA	1pA
Output Current (Typ)	20mA	20mA	10mA	20mA	20mA
Quiescent Current (Max)	300µA	300µA	640nA	375µA	375µA
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	0°C ~ 70°C	-40°C ~ 125°C
Package	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

TLC372QDR (Texas Instruments): This part is the direct parametric equivalent to the TLC372QDRG4, with identical electrical specifications and active product status. It maintains the same supply voltage range, input offset voltage, bias current, and output current characteristics. The primary difference is packaging format (Cut Tape & Digi-Reel® versus the original packaging). This is the preferred substitute for direct replacement in new production runs.

TS372IDT (STMicroelectronics): This part provides full parametric compatibility with the TLC372QDRG4 across all critical electrical parameters. It supports the complete -40°C ~ 125°C operating temperature range and maintains identical output current specifications. The TS372IDT is available in higher inventory quantities and offers an alternative source from a major semiconductor manufacturer.

TS372CDT (STMicroelectronics): This part shares identical electrical characteristics with the TS372IDT but operates within a reduced temperature range of 0°C ~ 70°C. Selection of this part is appropriate only for applications that do not require extended low-temperature operation below 0°C.

NCS3402DR2G (onsemi): This part provides functional compatibility as a general-purpose dual comparator with open-drain output configuration. While it supports a wider supply voltage range (2.5V ~ 16V) and exhibits superior quiescent current performance (640nA), it differs in output type configuration and input bias current specifications. This part is suitable for applications where the reduced output type flexibility and higher input bias current are acceptable trade-offs.

Frequently Asked Questions (FAQ)

Q: Can the TLC372QDR directly replace the TLC372QDRG4 without circuit modifications?

A: Yes. The TLC372QDR is a parametric equivalent with identical electrical specifications, supply voltage range, output current, and operating temperature range. The only difference is packaging format. No circuit modifications are required.

Q: What is the primary reason the TLC372QDRG4 is obsolete?

A: The TLC372QDRG4 has been superseded by the active TLC372QDR variant. Texas Instruments maintains the same electrical specifications across both parts, making the transition straightforward for design updates.

Q: Are the STMicroelectronics TS372 parts fully compatible with the TLC372QDRG4?

A: The TS372IDT and TS372CDT maintain identical output current, quiescent current, and output type configurations. Both support the required 8-SOIC package. The TS372IDT covers the full -40°C ~ 125°C temperature range. The TS372CDT is limited to 0°C ~ 70°C operation. Selection depends on application temperature requirements.

Q: How does the NCS3402DR2G differ functionally from the TLC372QDRG4?

A: The NCS3402DR2G is classified as a general-purpose comparator with open-drain output only, whereas the TLC372QDRG4 supports multiple output types (CMOS, MOS, open-drain, TTL). The NCS3402DR2G exhibits lower quiescent current (640nA) and higher input bias current (250pA @ 15V). It is suitable for applications where open-drain output is sufficient and lower power consumption is beneficial.

Q: Can I use the TS372CDT in applications requiring -40°C operation?

A: No. The TS372CDT operates only within the 0°C ~ 70°C range. For applications requiring -40°C ~ 125°C operation, use the TLC372QDR, TS372IDT, or NCS3402DR2G.

Q: Are all substitute parts available in the same packaging format?

A: All substitute parts use the 8-SOIC surface mount package with identical 0.154" (3.90mm) width. Packaging formats differ (Cut Tape & Digi-Reel® versus Tape & Reel), but the physical footprint remains unchanged for PCB compatibility.

Q: Which substitute part offers the best inventory availability?

A: The TS372IDT offers the highest inventory level at 19,135 pieces. The TS372CDT provides 10,400 pieces, and the TLC372QDR provides 3,400 pieces. The NCS3402DR2G offers 9,125 pieces.

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