LT1124CS8-1#PBF Equivalent & Substitute Parts

Part Overview

The LT1124CS8-1#PBF is a general purpose operational amplifier manufactured by Analog Devices Inc., configured as a dual-circuit (2-channel) device in an 8-SOIC surface mount package. This part is classified as obsolete, which necessitates identification of equivalent and substitute components for ongoing design support and production continuity. The LT1124CS8-1#PBF delivers a slew rate of 4.5 V/µs and gain bandwidth product of 12.5 MHz, making it suitable for general purpose amplification applications requiring moderate speed performance.

Key Parameters

Parameter	Value
Manufacturer Part Number	LT1124CS8-1#PBF
Manufacturer	Analog Devices Inc.
Category	Linear, Amplifiers
Amplifier Type	General Purpose
Number of Circuits	2
Slew Rate	4.5 V/µs
Gain Bandwidth Product	12.5 MHz
Current - Input Bias	7 nA
Voltage - Input Offset	25 µV
Current - Supply	2.3 mA (x2 Channels)
Voltage - Supply Span (Min)	8 V
Voltage - Supply Span (Max)	44 V
Operating Temperature	0°C ~ 70°C
Mounting Type	Surface Mount
Package / Case	8-SOIC (0.154", 3.90mm Width)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the LT1124CS8-1#PBF is determined by the following critical parameters:

Primary Substitution Criteria:

Number of circuits: 2 (dual-channel configuration)
Package type: 8-SOIC surface mount form factor
Slew rate: 4.5 V/µs or greater
Gain bandwidth product: 12.5 MHz or greater
Supply voltage range: Minimum 8 V to maximum 44 V
Input bias current: 7 nA or lower
Input offset voltage: 25 µV or lower

Substitution Categories:

Direct Equivalent (Identical Electrical Performance): The LT1124CS8#PBF represents a direct equivalent with identical electrical specifications. The primary distinction is packaging format (Tube versus the original specification) and active product status, making it the preferred replacement for obsolete stock.

Compatible Substitutes (Meets or Exceeds Performance): Parts including ISL28227FBZ-T7A, MC33072DR2G, OPA2227U/2K5, and OPA2277MDTEP meet the core substitution criteria of dual-circuit configuration, 8-SOIC packaging, and supply voltage compatibility. These parts maintain electrical performance within acceptable parameters for general purpose amplification applications.

Application-Specific Alternatives: The LME49860MAX/NOPB is classified as an audio amplifier with enhanced slew rate (20 V/µs) and gain bandwidth product (55 MHz), suitable for applications requiring higher frequency response and audio-grade performance specifications.

Limited Compatibility: The LM258DG4 and LM258DRG3 provide dual-circuit 8-SOIC packaging but exhibit reduced slew rate (0.3 V/µs) and gain bandwidth product (1.1 MHz or 700 kHz), limiting their use to low-frequency applications only.

Parameter Comparison

Part Number	Manufacturer	Amplifier Type	Slew Rate (V/µs)	GBW Product (MHz)	Input Bias (nA)	Input Offset (µV)	Supply Current (mA)	Supply Min (V)	Supply Max (V)	Temp Range (°C)	Product Status
LT1124CS8-1#PBF	Analog Devices	General Purpose	4.5	12.5	7	25	2.3	8	44	0 ~ 70	Obsolete
LT1124CS8#PBF	Analog Devices	General Purpose	4.5	12.5	7	25	2.3	8	44	0 ~ 70	Active
ISL28227FBZ-T7A	Renesas Electronics	General Purpose	3.6	10	1	10	2.2	4.5	40	-40 ~ 125	Obsolete
LM258DG4	Texas Instruments	General Purpose	0.3	1.1	20	3000	0.5	3	32	-25 ~ 85	Obsolete
LM258DRG3	Texas Instruments	General Purpose	0.3	0.7	20	3000	0.5	3	32	-25 ~ 85	Last Time Buy
LME49860MAX/NOPB	Texas Instruments	Audio	20	55	10	140	10.5	5	44	-40 ~ 85	Active
MC33072DR2G	onsemi	General Purpose	13	4.5	100	1000	1.9	3	44	-40 ~ 85	Active
OPA2227U/2K5	Texas Instruments	General Purpose	2.3	8	2.5	5	3.7	5	36	-40 ~ 85	Active
OPA2277MDTEP	Texas Instruments	General Purpose	0.8	1	0.5	20	0.79	4	36	-55 ~ 125	Active

Engineering Selection Recommendations

Primary Recommendation - Direct Equivalent: The LT1124CS8#PBF is the direct functional equivalent of the LT1124CS8-1#PBF. This part maintains identical electrical specifications and 8-SOIC packaging. The part is currently in active production status with ROHS3 compliance and REACH unaffected certification. Selection of this part eliminates design re-qualification requirements and ensures pin-for-pin compatibility.

Secondary Recommendations - Compatible Substitutes:

For applications requiring extended operating temperature range or enhanced performance characteristics, the following parts are suitable:

OPA2227U/2K5 (Texas Instruments): Active product status with ROHS3 compliance. Provides superior input offset voltage (5 µV) and input bias current (2.5 nA) compared to the original specification. Operating temperature range extends to -40°C ~ 85°C. Slew rate of 2.3 V/µs and gain bandwidth product of 8 MHz remain within acceptable performance envelope for general purpose applications. Supply voltage range of 5 V to 36 V is compatible with the original 8 V to 44 V specification for most practical applications.

MC33072DR2G (onsemi): Active product status with ROHS3 compliance. Offers enhanced slew rate (13 V/µs) and extended operating temperature range (-40°C ~ 85°C). Supply voltage range of 3 V to 44 V provides broader compatibility. Input bias current of 100 nA and input offset voltage of 1 mV represent trade-offs in precision performance.

OPA2277MDTEP (Texas Instruments): Active product status with ROHS3 compliance and extended operating temperature range (-55°C ~ 125°C). Exceptional input bias current (0.5 pA) and low supply current (0.79 mA). Reduced slew rate (0.8 V/µs) and gain bandwidth product (1 MHz) limit application to low-frequency circuits.

Application-Specific Alternative:

LME49860MAX/NOPB (Texas Instruments): Active product status with ROHS3 compliance. Classified as audio amplifier with significantly enhanced slew rate (20 V/µs) and gain bandwidth product (55 MHz). Suitable for audio frequency applications and high-speed signal conditioning. Higher supply current (10.5 mA) and input offset voltage (140 µV) represent performance trade-offs.

Not Recommended for Direct Substitution:

The LM258DG4 and LM258DRG3 exhibit slew rates of 0.3 V/µs and gain bandwidth products of 1.1 MHz or 700 kHz respectively. These specifications fall significantly below the original LT1124CS8-1#PBF performance envelope and are suitable only for low-frequency applications below 100 kHz.

The ISL28227FBZ-T7A, while offering superior input bias current (1 nA) and input offset voltage (10 µV), is classified as obsolete product status, providing no advantage over the active LT1124CS8#PBF equivalent.

Frequently Asked Questions (FAQ)

Q: Can the LT1124CS8#PBF directly replace the LT1124CS8-1#PBF without circuit modification?

A: Yes. The LT1124CS8#PBF is electrically identical to the LT1124CS8-1#PBF with matching pin configuration, electrical specifications, and 8-SOIC package dimensions. The primary difference is packaging format (Tube versus the original specification) and active product status. No circuit modification is required.

Q: What is the significance of the "-1" designation in the original part number?

A: The "-1" suffix in LT1124CS8-1#PBF indicates a specific packaging or temperature grade variant within the LT1124 product family. The LT1124CS8#PBF without the "-1" suffix maintains identical electrical performance and is the current production equivalent.

Q: Which substitute part offers the best performance improvement over the original LT1124CS8-1#PBF?

A: The LME49860MAX/NOPB provides the most significant performance enhancement with slew rate of 20 V/µs (versus 4.5 V/µs) and gain bandwidth product of 55 MHz (versus 12.5 MHz). However, this part is classified as an audio amplifier and is suitable only for applications requiring high-frequency response. For general purpose applications maintaining the original performance profile, the LT1124CS8#PBF is the appropriate selection.

Q: Are all substitute parts available in the same 8-SOIC package?

A: Yes. All substitute parts listed are available in 8-SOIC (0.154", 3.90mm Width) surface mount package, ensuring mechanical compatibility with existing printed circuit board layouts.

Q: What is the minimum supply voltage requirement for substitute parts?

A: The original LT1124CS8-1#PBF requires minimum 8 V supply voltage. Most substitute parts (LT1124CS8#PBF, ISL28227FBZ-T7A, MC33072DR2G, LME49860MAX/NOPB) support lower minimum supply voltages (3 V to 5 V). The OPA2227U/2K5 and OPA2277MDTEP require minimum 5 V and 4 V respectively. Verify circuit supply voltage compatibility before selection.

Q: Can the OPA2227U/2K5 be used in applications originally designed for the LT1124CS8-1#PBF?

A: The OPA2227U/2K5 is compatible for most general purpose amplification applications. Key differences include reduced slew rate (2.3 V/µs versus 4.5 V/µs) and reduced gain bandwidth product (8 MHz versus 12.5 MHz). Applications operating above 1 MHz or requiring rapid transient response may experience performance degradation. Verify frequency response and settling time requirements before substitution.

Q: What is the product status significance when selecting a substitute part?

A: Product status indicates manufacturing availability and long-term support. Active status parts (LT1124CS8#PBF, MC33072DR2G, LME49860MAX/NOPB, OPA2227U/2K5, OPA2277MDTEP) are currently manufactured and supported by their respective suppliers. Obsolete status parts (LT1124CS8-1#PBF, ISL28227FBZ-T7A, LM258DG4) have discontinued production and may have limited inventory availability. Last Time Buy status (LM258DRG3) indicates final production run with defined end-of-life date.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed are RoHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements for electronic component manufacturing and distribution.

Q: What is the operating temperature range difference between the original part and substitutes?

A: The original LT1124CS8-1#PBF operates from 0°C to 70°C. Most substitute parts extend this range to -40°C to 85°C or -55°C to 125°C. Applications requiring operation below 0°C or above 70°C benefit from substitute parts with extended temperature specifications. Verify thermal performance requirements before selection.

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