TS27L2BCDT Equivalent & Substitute Parts

Part Overview

The TS27L2BCDT is a CMOS amplifier integrated circuit manufactured by STMicroelectronics, configured as a 2-circuit operational amplifier in an 8-SOIC surface mount package. This device is classified as obsolete, indicating that direct procurement from the original manufacturer is no longer available through standard distribution channels. The TS27L2BCDT was designed for general-purpose analog signal conditioning applications requiring low input bias current and low power consumption characteristics typical of CMOS amplifier topologies.

Identification of equivalent and substitute parts is necessary due to the obsolete product status. Alternative components must satisfy the electrical performance envelope and mechanical compatibility requirements of the original design to ensure functional equivalence in circuit applications.

Key Parameters

Parameter	Value	Unit
Amplifier Type	CMOS	—
Number of Circuits	2	—
Slew Rate	0.04	V/µs
Gain Bandwidth Product	100	kHz
Current - Input Bias	1	pA
Voltage - Input Offset	1.1	mV
Current - Supply (x2 Channels)	10	µA
Current - Output / Channel	45	mA
Voltage - Supply Span (Min)	3	V
Voltage - Supply Span (Max)	16	V
Operating Temperature	0 to 70	°C
Package / Case	8-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 TS27L2BCDT requires matching across three critical parameter domains: amplifier topology, electrical performance envelope, and physical package compatibility.

Amplifier Topology: The TS27L2BCDT is a CMOS amplifier. Direct substitutes must maintain CMOS architecture to preserve input bias current characteristics (1 pA specification) and power consumption profile (10 µA per dual-channel configuration). General-purpose amplifiers with different topologies (bipolar or JFET input stages) exhibit fundamentally different input bias current behavior and are classified as similar rather than direct substitutes.

Electrical Performance Envelope: Substitute parts must operate within the defined voltage supply range (3 V to 16 V minimum and maximum) and support the operating temperature range (0°C to 70°C). The slew rate (0.04 V/µs) and gain bandwidth product (100 kHz) establish the frequency response and transient response characteristics. Parts with significantly higher bandwidth or slew rate specifications may introduce stability or noise considerations in legacy circuit designs.

Physical Package Compatibility: All substitute parts must use the 8-SOIC (0.154", 3.90mm Width) surface mount package to ensure direct board-level compatibility without redesign.

Substitution Categories:

Direct substitutes are CMOS dual-amplifier devices in 8-SOIC packaging with matching or superior electrical specifications within the defined operating envelope.

Similar substitutes are CMOS or general-purpose dual-amplifier devices in 8-SOIC packaging that satisfy package and basic functional requirements but may exhibit different electrical characteristics (higher bandwidth, different input bias current, or extended temperature range).

Parameter Comparison

Parameter	TS27L2BCDT (Main)	TLV27L2CDR	TLV27L2IDR	TLC1078CDR	TLC1078IDR
Manufacturer	STMicroelectronics	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments
Amplifier Type	CMOS	General Purpose	General Purpose	CMOS	CMOS
Number of Circuits	2	2	2	2	2
Slew Rate (V/µs)	0.04	0.06	0.06	0.032	0.032
Gain Bandwidth Product (kHz)	100	160	160	110	110
Current - Input Bias (pA)	1	1	1	1	1
Voltage - Input Offset (mV)	1.1	0.5	0.5	0.18	0.18
Current - Supply (µA, x2 Channels)	10	7	7	29	29
Current - Output / Channel (mA)	45	0.4	0.4	30	30
Voltage - Supply Span Min (V)	3	2.7	2.7	1.4	3
Voltage - Supply Span Max (V)	16	16	16	16	16
Operating Temperature (°C)	0 to 70	0 to 70	-40 to 125	0 to 70	-40 to 85
Package / Case	8-SOIC (0.154", 3.90mm)	8-SOIC (0.154", 3.90mm)	8-SOIC (0.154", 3.90mm)	8-SOIC (0.154", 3.90mm)	8-SOIC (0.154", 3.90mm)
Product Status	Obsolete	Active	Active	Last Time Buy	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Direct Substitutes (CMOS Topology, Matched Specifications):

The TLC1078CDR and TLC1078IDR represent the closest functional equivalents to the TS27L2BCDT. Both devices maintain CMOS amplifier architecture with 1 pA input bias current specification, matching the original design's low-input-current characteristic. The slew rate (0.032 V/µs) and gain bandwidth product (110 kHz) are within 20% of the original specification, ensuring compatibility with legacy circuit designs. Both parts are available in 8-SOIC packaging and are ROHS3 compliant. The TLC1078CDR is classified as Last Time Buy, indicating limited future availability; the TLC1078IDR maintains Active product status with extended operating temperature range (-40°C to 85°C), providing superior long-term procurement reliability.

Alternative Substitutes (General-Purpose Topology, Enhanced Performance):

The TLV27L2CDR and TLV27L2IDR are general-purpose amplifiers that deviate from strict CMOS topology but maintain the 1 pA input bias current specification through rail-to-rail output architecture. These devices offer improved gain bandwidth product (160 kHz) and lower input offset voltage (0.5 mV versus 1.1 mV), with reduced supply current (7 µA versus 10 µA). The TLV27L2CDR operates within the original temperature range (0°C to 70°C); the TLV27L2IDR extends to -40°C to 125°C. Both are Active products with established long-term availability. These substitutes are suitable for applications where enhanced bandwidth and precision offset voltage are beneficial.

Compliance and Regulatory Status:

All identified substitute parts maintain ROHS3 compliance and Moisture Sensitivity Level 1 (Unlimited) classification, matching the original device's environmental and regulatory profile. All parts carry EAR99 ECCN classification and are REACH Unaffected, ensuring no additional regulatory burden in procurement or deployment.

Frequently Asked Questions (FAQ)

Q: Can the TLV27L2CDR or TLV27L2IDR be used as direct replacements for the TS27L2BCDT?

A: The TLV27L2CDR and TLV27L2IDR are functionally compatible substitutes. Both maintain the 1 pA input bias current specification and 8-SOIC package format. The primary difference is amplifier topology: TLV devices are general-purpose (rail-to-rail output) rather than pure CMOS. This topology change does not affect pin compatibility or basic operational characteristics. The TLV27L2IDR is recommended for new designs due to Active product status and extended temperature range.

Q: What is the difference between the TLC1078CDR and TLC1078IDR?

A: Both devices are CMOS amplifiers with identical electrical specifications (0.032 V/µs slew rate, 110 kHz bandwidth, 1 pA input bias current). The primary distinction is operating temperature range: TLC1078CDR operates 0°C to 70°C (Last Time Buy status), while TLC1078IDR operates -40°C to 85°C (Active status). For applications requiring extended temperature operation or long-term procurement assurance, the TLC1078IDR is preferred.

Q: Are there substitutes with higher output current capability?

A: The TS27L2BCDT specifies 45 mA output current per channel. The TLC1078CDR and TLC1078IDR provide 30 mA per channel, which is lower. The TLV27L2CDR and TLV27L2IDR provide only 0.4 mA per channel. If the application requires the full 45 mA output current specification, these substitutes are not suitable. Applications requiring higher output current should be evaluated against the specific load impedance and signal swing requirements.

Q: Can I use the LM2904QDRG4 as a substitute?

A: The LM2904QDRG4 is a general-purpose amplifier in 8-SOIC packaging with Active product status. However, it exhibits significantly different electrical characteristics: 20 nA input bias current (versus 1 pA), 0.3 V/µs slew rate (versus 0.04 V/µs), and 700 kHz gain bandwidth product (versus 100 kHz). These differences indicate fundamentally different circuit behavior. The LM2904QDRG4 is classified as a similar part suitable only for applications where higher bandwidth and different input bias current are acceptable.

Q: What is the significance of the 8-SOIC package specification?

A: The 8-SOIC (0.154", 3.90mm Width) package is a standard surface mount dual in-line package with 8 pins. All identified substitute parts use this identical package format, ensuring direct board-level compatibility without PCB redesign. Pin assignments and spacing are standardized across all listed alternatives.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All identified substitute parts (TLV27L2CDR, TLV27L2IDR, TLC1078CDR, TLC1078IDR, and LM2904QDRG4) are ROHS3 compliant and carry Moisture Sensitivity Level 1 (Unlimited) classification, matching the original TS27L2BCDT environmental profile.

Q: Which substitute offers the best long-term availability?

A: The TLV27L2IDR and TLC1078IDR both maintain Active product status, indicating ongoing manufacturing and distribution support. The TLV27L2IDR is recommended for new designs due to extended operating temperature range (-40°C to 125°C) and established market presence. The TLC1078IDR provides CMOS topology matching with Active status and -40°C to 85°C temperature range.

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