TLC372QD Equivalent & Substitute Parts

Part Overview

The TLC372QD is a dual differential comparator IC manufactured by Texas Instruments in the LinCMOS™ series, housed in an 8-SOIC surface mount package. This component is classified as obsolete, which necessitates identification of active equivalent and substitute parts for ongoing design support and procurement. The TLC372QD provides CMOS, MOS, open-drain, and TTL output configurations suitable for precision voltage comparison applications across industrial and commercial temperature ranges.

Substiute Parts

TLC372QD

Texas InstrumentsIn Stock: 1268TLC372QD Datasheet

Current PartRFQ

TLC372QDR

Texas InstrumentsIn Stock: 3481TLC372QDR Datasheet

MFR RecommendedRFQ

NCS3402DR2G

onsemiIn Stock: 9169NCS3402DR2G Datasheet

MFR RecommendedRFQ

TS372CDT

STMicroelectronicsIn Stock: 10500TS372CDT Datasheet

MFR RecommendedRFQ

TS372IDT

STMicroelectronicsIn Stock: 19197TS372IDT Datasheet

MFR RecommendedRFQ

TLC372QDG4

Texas InstrumentsIn Stock: 722TLC372QDG4 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the TLC372QD is determined by strict alignment of the following electrical and mechanical parameters:

Primary Substitution Criteria:

• Package type: 8-SOIC surface mount form factor (0.154", 3.90mm width)
• Number of comparator elements: 2 differential channels
• Output configuration: CMOS, MOS, open-drain, or TTL compatible
• Supply voltage range: Minimum 4V single supply or ±2V dual supply capability
• Input offset voltage: Maximum 5mV specification
• Input bias current: Maximum 5pA specification
• Output current capability: Minimum 20mA typical
• Operating temperature range: -40°C to 125°C minimum
• Compliance: ROHS3 and REACH unaffected status

Substitute Categories:

1. MFR Recommended Direct Substitutes (Active product status, identical or superior electrical specifications, same package):

   • TLC372QDR (Texas Instruments, Cut Tape packaging)
   • TS372IDT (STMicroelectronics, Cut Tape packaging, extended temperature range)
   • TS372CDT (STMicroelectronics, Tape & Reel packaging, commercial temperature range)

2. Cross-Manufacturer Equivalent (Active product status, compatible electrical specifications, same package):

   • NCS3402DR2G (onsemi, general-purpose comparator with enhanced performance characteristics)

3. Parametric Equivalent (Identical electrical specifications, obsolete status):

   • TLC372QDG4 (Texas Instruments, parametric match to main part)

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: TLC372QDR

The TLC372QDR is the direct active equivalent manufactured by Texas Instruments. It maintains identical electrical specifications to the TLC372QD across all critical parameters including supply voltage range, input offset voltage, input bias current, and output current capability. The part is in active production status with superior inventory availability (3400 units) compared to the obsolete TLC372QD. Compliance certifications (ROHS3, REACH unaffected) are maintained. This part is suitable for direct replacement in all applications where the TLC372QD was originally specified.

Secondary Recommendation: TS372IDT

The TS372IDT from STMicroelectronics provides an active alternative with extended operating temperature range (-40°C to 125°C) matching the original specification. The part exhibits superior input bias current performance (1pA versus 5pA) and maintains the same output current capability. Supply voltage range is expanded to 3V minimum single supply, providing greater design flexibility. Inventory availability is substantial (19135 units). This part is suitable for applications requiring long-term supply assurance and enhanced performance margins.

Tertiary Recommendation: TS372CDT

The TS372CDT is functionally equivalent to TS372IDT but operates within a commercial temperature range (0°C to 70°C). This part is appropriate only for applications where the reduced temperature range is acceptable. Inventory availability is high (10400 units). This part is not suitable for industrial or extended temperature applications.

Cross-Manufacturer Alternative: NCS3402DR2G

The NCS3402DR2G from onsemi is a general-purpose comparator with compatible 8-SOIC packaging and dual-channel configuration. This part exhibits superior input offset voltage (3.6mV) and significantly lower quiescent current (640nA). However, the output type is limited to open-drain configuration, which may not be compatible with all original circuit designs requiring CMOS or TTL output. The reduced typical output current (10mA versus 20mA) requires circuit verification. This part is suitable only when output configuration and current requirements are compatible with the original design.

Parametric Equivalent: TLC372QDG4

The TLC372QDG4 is a parametric match to the TLC372QD with identical electrical specifications. However, this part is also classified as obsolete, making it unsuitable for new procurement or long-term supply assurance. This part should not be selected for design updates or production transitions.

Frequently Asked Questions (FAQ)

Q: Can I use TLC372QDR as a direct replacement for TLC372QD?

A: Yes. The TLC372QDR is manufactured by Texas Instruments with identical electrical specifications across all critical parameters: supply voltage range (4V ~ 16V, ±2V ~ 8V), input offset voltage (5mV @ 5V), input bias current (5pA @ 5V), output current (20mA typical), and operating temperature range (-40°C ~ 125°C). The 8-SOIC package is identical. The only difference is product status (active versus obsolete) and packaging format (Cut Tape versus Tube). Direct substitution is supported.

Q: What is the difference between TS372IDT and TS372CDT?

A: Both parts are manufactured by STMicroelectronics with identical electrical specifications. The primary difference is operating temperature range: TS372IDT operates from -40°C to 125°C (industrial range), while TS372CDT operates from 0°C to 70°C (commercial range). Select TS372IDT for applications requiring full industrial temperature coverage. Select TS372CDT only when the commercial temperature range is acceptable and cost optimization is a priority.

Q: Why does NCS3402DR2G have lower quiescent current than the TLC372QD?

A: The NCS3402DR2G is a general-purpose comparator design from onsemi with different internal architecture optimized for low power consumption. While the lower quiescent current (640nA versus 300µA) is advantageous for battery-powered applications, the output type is limited to open-drain configuration. Verify that your circuit design can accommodate open-drain output before selecting this part.

Q: Can I use TS372CDT in an application requiring -40°C operation?

A: No. The TS372CDT is rated for 0°C to 70°C operating temperature only. Applications requiring -40°C operation must use TLC372QDR, TS372IDT, or TLC372QDG4. The TS372CDT will not function reliably outside its specified temperature range.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed (TLC372QDR, TS372IDT, TS372CDT, NCS3402DR2G, and TLC372QDG4) are ROHS3 compliant and REACH unaffected, matching the compliance status of the original TLC372QD.

Q: What is the difference between Cut Tape and Tube packaging?

A: Both are surface mount delivery formats for 8-SOIC components. Tube packaging (TLC372QD) is typically used for lower-volume orders and manual assembly. Cut Tape and Digi-Reel packaging (TLC372QDR, TS372IDT) is optimized for automated pick-and-place assembly and higher-volume production. The electrical specifications and component functionality are identical; packaging format is a procurement and assembly consideration only.

Q: Is the NCS3402DR2G suitable for all TLC372QD applications?

A: No. The NCS3402DR2G has output type limited to open-drain only, whereas the TLC372QD supports CMOS, MOS, open-drain, and TTL outputs. Additionally, typical output current is 10mA versus 20mA. Verify that your circuit design can operate with open-drain output and reduced output current before selecting this part. If your design requires CMOS or TTL output, use TLC372QDR or TS372IDT instead.