TLC139MJB Equivalent & Substitute Parts Reference

Part Overview

The TLC139MJB is a quad, micropower, LinCMOS comparator manufactured by Texas Instruments, designed for general-purpose comparison applications. This device features CMOS open-drain output architecture and operates across a wide supply voltage range of 4V to 16V. The part is currently in Last Time Buy status, indicating discontinued production with limited inventory availability. Finding equivalent substitute parts is necessary to ensure design continuity and long-term component sourcing for new production runs or design revisions.

Substiute Parts

TLC139MJB

Texas InstrumentsIn Stock: 1617TLC139MJB Datasheet

Current PartRFQ

CMP401GSZ-REEL

Analog Devices Inc.In Stock: 2718CMP401GSZ-REEL Datasheet

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TS339CDT

STMicroelectronicsIn Stock: 5517TS339CDT Datasheet

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TS339IPT

STMicroelectronicsIn Stock: 19183TS339IPT Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the TLC139MJB is determined by the following critical parameters:

Primary Substitution Criteria:

• Number of Elements: Must be 4 (quad configuration)
• Output Type: Must be CMOS, Open-Drain (circuit interface requirement)
• Voltage - Supply Range: Must encompass or overlap with 4V ~ 16V
• Input Offset Voltage: Must not exceed 5mV @ 10V
• Current - Output: Must support minimum 20mA typical output drive
• RoHS Compliance: Must maintain ROHS3 Compliant status

Secondary Compatibility Factors:

• Operating Temperature Range: Extended range preferred for design margin
• Input Bias Current: Lower values indicate superior performance
• Quiescent Current: Lower values preferred for power-sensitive applications
• Package compatibility: Through-hole or surface-mount variants acceptable if electrical specifications align

The substitute parts identified below meet the primary substitution criteria while offering variations in package form factor and mounting technology.

Parameter Comparison

Engineering Selection Recommendations

TS339CDT (STMicroelectronics, 14-SOIC Surface Mount)

This substitute maintains electrical equivalence with the TLC139MJB across all critical parameters. The TS339CDT provides identical input offset voltage (5mV @ 10V), output type (CMOS, open-drain), and output drive capability (20mA). Superior input bias current (1pA vs. 5pA) and lower quiescent current (25µA vs. 80µA) represent performance improvements. The primary trade-off is the reduced operating temperature range (0°C ~ 70°C vs. -55°C ~ 125°C), which may limit applicability in extended-temperature environments. Surface-mount 14-SOIC packaging requires PCB redesign from the through-hole 14-CDIP format. Product status is Active with 5465 units in stock.

TS339IPT (STMicroelectronics, 14-TSSOP Surface Mount)

This variant offers identical electrical specifications to the TS339CDT with the advantage of extended operating temperature range (-40°C ~ 125°C), providing better coverage of the original TLC139MJB temperature specification. The 14-TSSOP package is a smaller surface-mount form factor compared to 14-SOIC. Input bias current and quiescent current improvements match the TS339CDT. This option is recommended for designs requiring temperature performance closer to the original specification while transitioning to surface-mount technology. Product status is Active with 19094 units in stock, providing superior availability.

CMP401GSZ-REEL (Analog Devices Inc., 16-SOIC Surface Mount)

This substitute meets the quad comparator requirement with CMOS output capability but introduces output type variation (CMOS, TTL vs. CMOS, open-drain). The supply voltage specification (±5V) is narrower than the TLC139MJB range (4V ~ 16V), restricting applicability to dual-supply systems. Input offset voltage is superior (3mV @ 5V), but quiescent current is significantly higher (6mA, 1mA vs. 80µA), making this option unsuitable for micropower applications. CMRR and PSRR specifications are reduced (60dB vs. 84dB and 85dB). This substitute is not recommended as a direct replacement due to output type incompatibility and power consumption characteristics. Product status is Active with 2700 units in stock.

Frequently Asked Questions (FAQ)

Q: Can TS339CDT or TS339IPT be used as direct pin-for-pin replacements for TLC139MJB?

A: No. While the TS339 series maintains electrical equivalence, the package form factors differ significantly. TLC139MJB uses 14-CDIP (through-hole), while TS339CDT uses 14-SOIC and TS339IPT uses 14-TSSOP (both surface-mount). PCB layout and assembly process modifications are required. Pin-to-pin functionality is equivalent, but physical placement and soldering methods differ.

Q: What is the impact of the reduced operating temperature range in TS339CDT (0°C ~ 70°C)?

A: The TS339CDT operating range is narrower than the TLC139MJB (-55°C ~ 125°C). If your application requires operation below 0°C or above 70°C, TS339CDT is not suitable. TS339IPT extends the lower temperature limit to -40°C, providing better coverage for industrial applications, though the upper limit remains at 125°C.

Q: Why is CMP401GSZ-REEL not recommended as a substitute despite being a quad comparator?

A: CMP401GSZ-REEL has three critical limitations: (1) Output type is CMOS, TTL rather than CMOS, open-drain, affecting circuit interface compatibility; (2) Supply voltage range (±5V) is narrower than TLC139MJB (4V ~ 16V), restricting design flexibility; (3) Quiescent current (6mA, 1mA) is substantially higher than TLC139MJB (80µA), making it unsuitable for micropower applications. These factors make it incompatible with designs optimized for the TLC139MJB.

Q: What are the inventory implications of selecting a substitute?

A: TLC139MJB is in Last Time Buy status with 1529 units available. TS339IPT offers the highest availability (19094 units), followed by TS339CDT (5465 units) and CMP401GSZ-REEL (2700 units). For long-term production, TS339IPT is the most secure choice due to Active product status and superior stock levels.

Q: Are all substitute options RoHS3 compliant?

A: Yes. TLC139MJB, TS339CDT, TS339IPT, and CMP401GSZ-REEL are all ROHS3 Compliant, maintaining environmental compliance standards across all substitute options.

Q: How do input bias current differences affect circuit design?

A: TLC139MJB specifies 5pA input bias current, while TS339 series specifies 1pA. Lower input bias current reduces input offset errors and improves accuracy in high-impedance input circuits. For most general-purpose applications, this difference is negligible, but precision measurement circuits may benefit from the improved TS339 specification.

Q: What mounting technology transition is required when switching from TLC139MJB to TS339 series?

A: TLC139MJB requires through-hole assembly (14-CDIP package). Both TS339CDT (14-SOIC) and TS339IPT (14-TSSOP) require surface-mount assembly. This necessitates PCB redesign, updated assembly processes, and requalification of manufacturing procedures. Surface-mount technology generally offers improved density and automated assembly advantages.