TLC27L4BCD CMOS Amplifier Equivalent & Substitute Parts

Part Overview

The TLC27L4BCD is a CMOS amplifier integrated circuit containing four independent operational amplifier circuits in a 14-SOIC surface mount package. Manufactured by Texas Instruments under the LinCMOS™ series, this device operates across a 3V to 16V supply voltage range with an operating temperature range of 0°C to 70°C. The part is designated as Last Time Buy status, indicating discontinued production. Equivalent and substitute parts are necessary to maintain design continuity and ensure long-term component availability for new production runs and legacy system support.

Key Parameters

Parameter	Value	Unit
Amplifier Type	CMOS	—
Number of Circuits	4	—
Slew Rate	0.05	V/µs
Gain Bandwidth Product	110	kHz
Current - Input Bias	0.7	pA
Voltage - Input Offset	1.1	mV
Current - Supply (x4 Channels)	57	µA
Current - Output / Channel	30	mA
Voltage - Supply Span (Min)	3	V
Voltage - Supply Span (Max)	16	V
Operating Temperature	0 to 70	°C
Package / Case	14-SOIC (0.154", 3.90mm Width)	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the TLC27L4BCD is determined by electrical and mechanical compatibility across the following critical parameters:

Electrical Compatibility Criteria:

Amplifier Type: CMOS
Number of Circuits: 4 independent channels
Supply Voltage Range: 3V to 16V minimum and maximum
Operating Temperature Range: Must encompass or match the application requirement
Package / Case: 14-SOIC form factor with 0.154" (3.90mm) width

Performance Parameters:

Slew Rate, Gain Bandwidth Product, Input Bias Current, Input Offset Voltage, Supply Current, and Output Current determine functional equivalence within application-specific constraints

Mechanical Compatibility:

Surface mount technology with 14-SOIC package footprint ensures PCB layout compatibility
Supplier device package designation (14-SO or 14-SOIC) confirms pinout and lead configuration alignment

Substitute parts are grouped into two categories based on performance characteristics: standard-performance equivalents (TS27L4 series) and enhanced-performance alternatives (TS27M4 series). The TLC27L4BCDR represents a direct equivalent with identical electrical specifications but different packaging format (Tape & Reel versus Tube).

Parameter Comparison

Parameter	TLC27L4BCD	TLC27L4BCDR	TS27L4AIDT	TS27L4CDT	TS27L4IDT	TS27M4CDT	TS27M4IDT
Manufacturer	Texas Instruments	Texas Instruments	STMicroelectronics	STMicroelectronics	STMicroelectronics	STMicroelectronics	STMicroelectronics
Product Status	Last Time Buy	Active	Active	Active	Active	Active	Active
Amplifier Type	CMOS	CMOS	CMOS	CMOS	CMOS	CMOS	CMOS
Number of Circuits	4	4	4	4	4	4	4
Slew Rate (V/µs)	0.05	0.05	0.04	0.04	0.04	0.6	0.6
Gain Bandwidth Product (kHz)	110	110	100	100	100	1000	1000
Current - Input Bias (pA)	0.7	0.7	1	1	1	1	1
Voltage - Input Offset (mV)	1.1	1.1	0.9	1.1	1.1	1.1	1.1
Current - Supply (µA x4 Channels)	57	57	10	10	10	150	150
Current - Output / Channel (mA)	30	30	45	45	45	45	45
Voltage - Supply Span (Min) (V)	3	3	3	3	3	3	3
Voltage - Supply Span (Max) (V)	16	16	16	16	16	16	16
Operating Temperature (°C)	0 to 70	0 to 70	-40 to 125	0 to 70	-40 to 125	0 to 70	-40 to 125
Package / Case	14-SOIC	14-SOIC	14-SOIC	14-SOIC	14-SOIC	14-SOIC	14-SOIC
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Direct Equivalent (Identical Electrical Performance):

The TLC27L4BCDR is the primary substitute for TLC27L4BCD. Both parts share identical electrical specifications including slew rate (0.05V/µs), gain bandwidth product (110 kHz), input bias current (0.7 pA), and supply current (57µA across four channels). The sole difference is packaging format: TLC27L4BCDR is supplied in Tape & Reel format with 17,800 units in stock versus the original Tube packaging. Both maintain Active product status and ROHS3 compliance. This substitute is suitable for direct replacement in new production runs.

Standard-Performance Alternatives (TS27L4 Series):

The TS27L4AIDT, TS27L4CDT, and TS27L4IDT represent functionally equivalent alternatives manufactured by STMicroelectronics. These parts maintain the same 4-circuit CMOS architecture, 14-SOIC package, and 3V to 16V supply range. Performance differences include lower supply current (10µA versus 57µA), higher output current capability (45mA versus 30mA), and marginally lower slew rate (0.04V/µs versus 0.05V/µs). Operating temperature ranges vary: TS27L4CDT matches the original 0°C to 70°C specification, while TS27L4AIDT and TS27L4IDT extend to -40°C to 125°C. All three maintain Active status and ROHS3 compliance with substantial inventory availability (1,844 to 30,200 units).

Enhanced-Performance Alternatives (TS27M4 Series):

The TS27M4CDT and TS27M4IDT offer higher performance characteristics with 10× gain bandwidth product (1 MHz versus 110 kHz) and 12× slew rate (0.6V/µs versus 0.05V/µs). These parts are suitable only for applications requiring enhanced frequency response and transient performance. Supply current increases to 150µA, and output current remains at 45mA. TS27M4CDT operates at 0°C to 70°C while TS27M4IDT extends to -40°C to 125°C. Both maintain Active status and ROHS3 compliance.

Selection Criteria:

For direct replacement in existing designs, select TLC27L4BCDR. For new designs requiring enhanced availability and lower power consumption, select TS27L4CDT (matching temperature range) or TS27L4IDT (extended temperature range). For applications requiring higher bandwidth and slew rate, select TS27M4CDT or TS27M4IDT based on temperature requirements. All substitutes maintain identical package footprint, pinout compatibility, and regulatory compliance.

Frequently Asked Questions (FAQ)

Q: Can TLC27L4BCDR replace TLC27L4BCD in existing designs without circuit modification?

A: Yes. TLC27L4BCDR is electrically identical to TLC27L4BCD with matching slew rate (0.05V/µs), gain bandwidth product (110 kHz), input bias current (0.7 pA), and supply current specifications. The only difference is packaging format (Tape & Reel versus Tube). PCB footprint and pinout are identical. No circuit modification is required.

Q: What are the key differences between TS27L4 and TS27M4 series substitutes?

A: The TS27M4 series provides enhanced performance with 10× higher gain bandwidth product (1 MHz versus 100 kHz) and 15× higher slew rate (0.6V/µs versus 0.04V/µs). Supply current increases from 10µA to 150µA. The TS27L4 series is suitable for standard-performance applications, while TS27M4 is required for high-frequency or fast-transient applications.

Q: Are all substitute parts compatible with the 14-SOIC package footprint?

A: Yes. All substitute parts use the 14-SOIC (0.154", 3.90mm width) surface mount package with identical pinout and lead configuration. PCB layout and assembly processes require no modification.

Q: What is the difference between TS27L4CDT and TS27L4IDT?

A: Both parts share identical electrical specifications. The primary difference is operating temperature range: TS27L4CDT operates 0°C to 70°C (matching TLC27L4BCD), while TS27L4IDT operates -40°C to 125°C. Select TS27L4IDT for applications requiring extended temperature operation.

Q: Do all substitute parts maintain RoHS3 compliance?

A: Yes. All substitute parts listed (TLC27L4BCDR, TS27L4AIDT, TS27L4CDT, TS27L4IDT, TS27M4CDT, TS27M4IDT) are ROHS3 compliant with Moisture Sensitivity Level 1 (Unlimited). Regulatory compliance is maintained across all alternatives.

Q: Why does TLC27L4BCD have Last Time Buy status?

A: Last Time Buy status indicates the manufacturer (Texas Instruments) has discontinued production. Existing inventory is available for final orders only. Substitution to active-status alternatives (TLC27L4BCDR or TS27L4 series) is necessary for long-term component availability and future production continuity.

Q: Can TS27L4AIDT be used in applications requiring 0°C to 70°C operation?

A: TS27L4AIDT operates across -40°C to 125°C, which encompasses the 0°C to 70°C range. It is suitable for this application. However, TS27L4CDT is the preferred substitute when operation is limited to 0°C to 70°C, as it matches the original specification exactly.

Q: What is the inventory status of substitute parts?

A: TLC27L4BCDR has 17,800 units in stock. TS27L4CDT has the highest availability at 30,200 units. TS27L4IDT has 23,400 units, TS27L4AIDT has 1,844 units, TS27M4IDT has 7,910 units, and TS27M4CDT has 5,450 units. All substitutes maintain active production status with substantial inventory.

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