TLC139MFKB Equivalent & Substitute Parts

Part Overview

The TLC139MFKB is a quad micropower linear CMOS comparator manufactured by Texas Instruments, designed for general-purpose comparison applications. The device features open-drain output configuration and operates across a wide supply voltage range of 4V to 16V. Currently classified as Last Time Buy, this part requires identification of active substitute components to ensure design continuity and long-term supply chain reliability. Substitute parts must maintain functional equivalence in quad comparator topology, general-purpose application suitability, and compatible electrical performance within specified operating parameters.

Key Parameters

Parameter	Value	Specification
Number of Elements	4	Quad comparator configuration
Output Type	CMOS, Open-Drain	Open-drain output stage
Voltage - Supply, Single/Dual (±)	4V ~ 16V	Operating supply voltage range
Voltage - Input Offset (Max)	5mV @ 10V	Maximum input offset voltage
Current - Input Bias (Max)	5pA @ 5V	Maximum input bias current
Current - Output (Typ)	20mA	Typical output current
Current - Quiescent (Max)	80µA	Maximum quiescent current
CMRR, PSRR (Typ)	84dB CMRR, 85dB PSRR	Common-mode and power supply rejection
Propagation Delay (Max)	3.6µs (Typ)	Maximum propagation delay
Operating Temperature	-55°C ~ 125°C	Temperature operating range
Package / Case	20-CLCC (8.89x8.89)	Surface mount ceramic leadless chip carrier
RoHS Status	ROHS3 Compliant	Environmental compliance

Substitute Part Grouping Explanation

Substitution of the TLC139MFKB is determined by the following critical parameters: quad comparator topology (4 elements), general-purpose application type, and compatible output stage configuration. The primary substitutes identified are CMP401GSZ, CMP402GSZ, and TS374IDT, all manufactured by Analog Devices Inc. and STMicroelectronics respectively.

Substitution Logic:

The CMP401GSZ and CMP402GSZ maintain quad comparator topology with general-purpose functionality and CMOS/TTL output compatibility. Both operate at ±5V supply voltage, which falls within the extended supply range capability of the TLC139MFKB. These parts feature superior input offset voltage (3mV vs. 5mV) and significantly faster propagation delay (30ns and 75ns respectively vs. 3.6µs), making them suitable for applications where the TLC139MFKB's performance envelope is acceptable.

The TS374IDT from STMicroelectronics provides quad comparator functionality with differential input configuration and multi-output type support (CMOS, MOS, Open-Drain, TTL). Its supply voltage range of 3V ~ 16V and ±1.5V ~ 8V encompasses the TLC139MFKB operating window. The TS374IDT features lower input bias current (1pA vs. 5pA) and maintains 20mA typical output current matching the main part.

Key Parameters for Substitution Compatibility:

Number of Elements: 4 (quad configuration required)
Output Type: CMOS and/or Open-Drain capability
Supply Voltage Range: Must encompass or overlap with 4V ~ 16V
General-Purpose Type Classification
Surface Mount Packaging
ROHS3 Compliance

Parameter Comparison

Parameter	TLC139MFKB (Main)	CMP401GSZ	CMP402GSZ	TS374IDT
Manufacturer	Texas Instruments	Analog Devices Inc.	Analog Devices Inc.	STMicroelectronics
Number of Elements	4	4	4	4
Type	General Purpose	General Purpose	General Purpose	Differential
Output Type	CMOS, Open-Drain	CMOS, TTL	CMOS, TTL	CMOS, MOS, Open-Drain, TTL
Voltage - Supply (±)	4V ~ 16V	±5V	±5V	3V ~ 16V, ±1.5V ~ 8V
Voltage - Input Offset (Max)	5mV @ 10V	3mV @ 5V	3mV @ 5V	10mV @ 5V
Current - Input Bias (Max)	5pA @ 5V	3µA @ 5V	3µA @ 5V	1pA @ 5V
Current - Output (Typ)	20mA	-	-	20mA
Current - Quiescent (Max)	80µA	6mA, 1mA	1.2mA, 1mA	250µA
CMRR, PSRR (Typ)	84dB CMRR, 85dB PSRR	60dB CMRR, 60dB PSRR	60dB CMRR, 60dB PSRR	-
Propagation Delay (Max)	3.6µs (Typ)	30ns	75ns	-
Operating Temperature	-55°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C
Package / Case	20-CLCC (8.89x8.89)	16-SOIC (0.154", 3.90mm)	16-SOIC (0.154", 3.90mm)	14-SOIC (0.154", 3.90mm)
Product Status	Last Time Buy	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

CMP401GSZ and CMP402GSZ Selection:

Both Analog Devices parts maintain active product status with established supply chain availability (2813 and 3254 units in stock respectively). These components are ROHS3 compliant and suitable for applications requiring quad general-purpose comparator functionality. The CMP401GSZ provides 30ns propagation delay, while CMP402GSZ offers 75ns propagation delay. Selection between these two depends on timing requirements within the application circuit. Both parts operate at ±5V supply voltage, requiring voltage regulation if the TLC139MFKB design utilizes the full 4V ~ 16V range. Package transition from 20-CLCC to 16-SOIC requires PCB layout modification.

TS374IDT Selection:

The STMicroelectronics TS374IDT provides the broadest supply voltage compatibility (3V ~ 16V, ±1.5V ~ 8V) among substitute options, minimizing design modification requirements. Active product status and 7840 units in stock ensure supply continuity. ROHS3 compliance and REACH unaffected status confirm environmental and regulatory alignment. The TS374IDT features the lowest input bias current (1pA) and maintains 20mA typical output current matching the TLC139MFKB specification. Package transition from 20-CLCC to 14-SOIC requires PCB layout modification. Differential input configuration provides enhanced noise immunity compared to general-purpose topology.

Compliance and Certification:

All substitute parts carry ROHS3 compliance certification, ensuring regulatory alignment with the original TLC139MFKB. Analog Devices parts include REACH unaffected status and EAR99 ECCN classification. Moisture sensitivity level (MSL) ratings of 1 (Unlimited) for substitute parts indicate superior moisture handling compared to the main part specification.

Frequently Asked Questions (FAQ)

Q: Can CMP401GSZ or CMP402GSZ directly replace TLC139MFKB without circuit modification?

A: Direct pin-for-pin replacement is not possible due to package differences (20-CLCC vs. 16-SOIC). PCB layout redesign is required. Additionally, the supply voltage specification differs (±5V vs. 4V ~ 16V), requiring voltage regulation circuit evaluation. Output type compatibility (CMOS/TTL vs. CMOS/Open-Drain) must be verified against load requirements.

Q: What are the key differences between CMP401GSZ and CMP402GSZ?

A: Both parts are quad general-purpose comparators from Analog Devices with identical electrical specifications except propagation delay. CMP401GSZ specifies 30ns maximum propagation delay, while CMP402GSZ specifies 75ns. Selection depends on application timing requirements. Quiescent current specifications differ slightly (6mA, 1mA vs. 1.2mA, 1mA), with CMP402GSZ offering lower power consumption in certain operating modes.

Q: Why does TS374IDT specify "Differential" type while TLC139MFKB is "General Purpose"?

A: Type classification reflects input stage architecture. TS374IDT differential configuration provides enhanced common-mode rejection and noise immunity suitable for precision measurement applications. General-purpose classification of TLC139MFKB indicates broader application flexibility. Both topologies function as comparators; differential configuration is a superset of general-purpose capability.

Q: Is the TS374IDT supply voltage range fully compatible with TLC139MFKB designs?

A: TS374IDT supply range (3V ~ 16V, ±1.5V ~ 8V) encompasses the TLC139MFKB range (4V ~ 16V). The lower 3V minimum specification provides additional design flexibility. Designs operating at the TLC139MFKB minimum (4V) are fully compatible with TS374IDT. No supply circuit modification is required for voltage range compatibility.

Q: What packaging considerations apply when substituting these parts?

A: TLC139MFKB uses 20-CLCC (ceramic leadless chip carrier), while all substitutes use SOIC packages (16-SOIC or 14-SOIC). SOIC packages feature gull-wing leads requiring different PCB pad geometry and solder reflow profiles. Lead pitch differs (CLCC vs. SOIC standard spacing). PCB layout redesign, including trace routing and thermal management, is mandatory. Mechanical clearance and connector proximity must be re-evaluated.

Q: Do substitute parts maintain the input offset voltage specification of TLC139MFKB?

A: CMP401GSZ and CMP402GSZ specify 3mV input offset (superior to TLC139MFKB 5mV). TS374IDT specifies 10mV input offset (less stringent than TLC139MFKB). Applications requiring precision offset matching must account for these differences. Offset voltage temperature drift and supply voltage dependency are not provided for substitute parts; original datasheets must be consulted for detailed specifications.

Q: Are there thermal management differences between TLC139MFKB and substitute parts?

A: CLCC packages typically offer superior thermal performance compared to SOIC packages due to larger die contact area. Quiescent current specifications differ significantly (TLC139MFKB 80µA max vs. CMP401GSZ 6mA, CMP402GSZ 1.2mA, TS374IDT 250µA). Applications with stringent power dissipation requirements must evaluate thermal characteristics using manufacturer datasheets. PCB thermal design may require modification when transitioning from CLCC to SOIC packaging.

Q: What is the operating temperature range compatibility?

A: TLC139MFKB operates -55°C ~ 125°C, while all substitutes operate -40°C ~ 125°C. Applications requiring operation below -40°C cannot use substitute parts. The upper temperature limit (125°C) is identical across all parts. Designs operating within -40°C ~ 125°C range are fully compatible with all substitute options.

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