TL322CDRG4 Equivalent & Substitute Parts

Part Overview

The TL322CDRG4 is a general-purpose operational amplifier manufactured by Texas Instruments, configured as a dual-channel (2 circuit) device in an 8-SOIC surface-mount package. This component is classified as obsolete, indicating discontinued production and limited availability for new designs. The part operates across a supply voltage range of 5V to 30V with an operating temperature range of 0°C to 70°C. Due to its obsolete status, identifying functionally compatible substitute components is essential for design continuity, production support, and long-term supply chain management.

Key Parameters

Parameter	Value	Unit
Manufacturer Part Number	TL322CDRG4	—
Manufacturer	Texas Instruments	—
Category	Linear, Amplifiers	—
Amplifier Type	General Purpose	—
Number of Circuits	2	—
Package / Case	8-SOIC (0.154", 3.90mm Width)	—
Mounting Type	Surface Mount	—
Slew Rate	0.6	V/µs
Gain Bandwidth Product	1	MHz
Current - Input Bias	200	nA
Voltage - Input Offset	2	mV
Current - Supply	1.4 (x2 Channels)	mA
Current - Output / Channel	10	mA
Voltage - Supply Span (Min)	5	V
Voltage - Supply Span (Max)	30	V
Operating Temperature	0 to 70	°C
Product Status	Obsolete	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the TL322CDRG4 is determined by strict alignment of the following critical parameters:

Primary Substitution Criteria:

Package type: 8-SOIC (0.154", 3.90mm Width) — physical and electrical compatibility
Number of circuits: 2 — functional equivalence
Supply voltage range: Minimum 5V, Maximum 30V — operational compatibility
Mounting type: Surface Mount — assembly compatibility
Amplifier type: General Purpose — functional classification

Secondary Compatibility Parameters:

Slew rate, gain bandwidth product, input bias current, input offset voltage, supply current, and output current per channel — performance characteristics that determine circuit behavior

Substitute parts are grouped into two categories:

Category A — Direct Performance Equivalents: Parts with electrical characteristics closely matching the TL322CDRG4 (slew rate ~0.6–0.8 V/µs, gain bandwidth product ~1 MHz, similar input bias and offset specifications). These include MC1458DT and OP221GSZ variants.

Category B — Enhanced Performance Alternatives: Parts with superior electrical performance (higher slew rate, higher gain bandwidth product, lower input offset voltage) while maintaining package compatibility and supply voltage range. These include LT1208CS8 variants, MC33078DT, MC33078YDT, and TL062CD variants.

All substitute parts maintain 8-SOIC packaging, dual-channel configuration, surface-mount technology, and compliance with RoHS3 and REACH requirements.

Parameter Comparison

Part Number	Manufacturer	Product Status	Slew Rate (V/µs)	GBW (MHz)	Input Bias (nA)	Input Offset (mV)	Supply Current (mA)	Output Current (mA)	Temp Range (°C)	Package
TL322CDRG4	Texas Instruments	Obsolete	0.6	1	200	2	1.4	10	0 to 70	8-SOIC
MC1458DT	STMicroelectronics	Active	0.8	1	30	1	2.3	25	0 to 70	8-SOIC
OP221GSZ	Analog Devices Inc.	Active	0.3	—	70	0.25	0.85	—	-55 to 125	8-SOIC
OP221GSZ-REEL	Analog Devices Inc.	Active	0.3	—	70	0.25	0.85	—	-55 to 125	8-SOIC
OP221GSZ-REEL7	Analog Devices Inc.	Active	0.3	—	70	0.25	0.85	—	-55 to 125	8-SOIC
LT1208CS8#PBF	Analog Devices Inc.	Active	400	45	4000	1	7	40	0 to 70	8-SOIC
LT1208CS8#TRPBF	Analog Devices Inc.	Active	400	45	4000	1	7	40	0 to 70	8-SOIC
MC33078DT	STMicroelectronics	Active	7	15	250	0.15	4	37	-40 to 105	8-SOIC
MC33078YDT	STMicroelectronics	Active	7	15	250	0.15	4	37	-40 to 105	8-SOIC
TL062CD	STMicroelectronics	Active	3.5	1	30	3	0.2	20	0 to 70	8-SOIC
TL062CDT	STMicroelectronics	Active	3.5	1	30	3	0.2	20	0 to 70	8-SOIC

Engineering Selection Recommendations

For Direct Replacement (Obsolete Part Continuity):

MC1458DT is the primary substitute for the TL322CDRG4. Both parts share identical gain bandwidth product (1 MHz), matching operating temperature range (0°C to 70°C), and compatible supply voltage specifications (5V to 30V). MC1458DT is manufactured by STMicroelectronics and maintains active product status with high inventory availability (1559 pcs). The part is RoHS3 compliant and REACH unaffected, meeting current regulatory requirements. Electrical performance is comparable, with MC1458DT offering slightly improved slew rate (0.8 V/µs vs. 0.6 V/µs) and lower input bias current (30 nA vs. 200 nA).

For Extended Temperature Range Applications:

OP221GSZ, OP221GSZ-REEL, and OP221GSZ-REEL7 (all Analog Devices Inc.) provide extended operating temperature range (-55°C to 125°C) compared to the TL322CDRG4 (0°C to 70°C). These parts maintain 8-SOIC packaging and dual-channel configuration. All three variants are active products with substantial inventory. The primary difference between variants is packaging format: OP221GSZ is supplied in tube, while OP221GSZ-REEL and OP221GSZ-REEL7 are supplied in tape and reel format. All three are RoHS3 compliant and REACH unaffected.

For Automotive-Grade Applications:

MC33078DT and MC33078YDT (STMicroelectronics) are qualified to AEC-Q100 automotive standards and support extended operating temperature range (-40°C to 105°C). Both parts offer superior slew rate (7 V/µs) and gain bandwidth product (15 MHz) compared to the TL322CDRG4. MC33078DT and MC33078YDT are functionally identical; the primary distinction is packaging format (MC33078DT in cut tape, MC33078YDT in cut tape with Digi-Reel). Both maintain 8-SOIC packaging, dual-channel configuration, and are RoHS3 compliant.

For Low-Power Applications:

TL062CD and TL062CDT (STMicroelectronics) feature J-FET input architecture with extremely low input bias current (30 pA) and minimal supply current (200 µA per channel). These parts are suitable for applications requiring ultra-low input leakage. Both variants maintain 1 MHz gain bandwidth product and 8-SOIC packaging. TL062CD is supplied in tube; TL062CDT is supplied in cut tape with Digi-Reel. Both are active products with high inventory availability and RoHS3 compliance.

For High-Performance Applications:

LT1208CS8#PBF and LT1208CS8#TRPBF (Analog Devices Inc.) deliver significantly enhanced performance with 400 V/µs slew rate and 45 MHz gain bandwidth product. These parts are suitable for applications requiring higher bandwidth and faster transient response. LT1208CS8#PBF is supplied in tube; LT1208CS8#TRPBF is supplied in tape and reel. Both maintain 8-SOIC packaging, dual-channel configuration, and 0°C to 70°C operating temperature range. Both are active products and RoHS3 compliant.

Frequently Asked Questions (FAQ)

Q1: Can MC1458DT directly replace TL322CDRG4 without circuit modification?

A: MC1458DT is electrically compatible with TL322CDRG4 for most general-purpose amplifier applications. Both parts share identical gain bandwidth product (1 MHz), matching supply voltage range (5V to 30V), and identical operating temperature range (0°C to 70°C). The 8-SOIC package pinout is identical. No circuit modification is required for pin-to-pin substitution. However, verify that the application does not depend on the specific input bias current or slew rate characteristics of the original part.

Q2: What is the difference between OP221GSZ, OP221GSZ-REEL, and OP221GSZ-REEL7?

A: All three part numbers (OP221GSZ, OP221GSZ-REEL, OP221GSZ-REEL7) are functionally identical Analog Devices Inc. components with identical electrical specifications. The difference is packaging format only: OP221GSZ is supplied in tube packaging, while OP221GSZ-REEL and OP221GSZ-REEL7 are supplied in tape and reel format. Selection depends on assembly process requirements. Tube packaging is suitable for manual or small-batch assembly; tape and reel format is optimized for automated pick-and-place assembly.

Q3: Why do MC33078DT and MC33078YDT have different part numbers if they are functionally identical?

A: MC33078DT and MC33078YDT are functionally and electrically identical. The difference is packaging format: MC33078DT is supplied in cut tape with Digi-Reel, while MC33078YDT is also supplied in cut tape with Digi-Reel. Both are AEC-Q100 qualified automotive-grade components. Selection depends on assembly process compatibility and supplier availability.

Q4: Can LT1208CS8#PBF be used in place of TL322CDRG4 in all applications?

A: LT1208CS8#PBF is not a direct replacement for all applications. While both parts share 8-SOIC packaging, dual-channel configuration, and compatible supply voltage range (5V to 30V), LT1208CS8#PBF has significantly different electrical characteristics: 400 V/µs slew rate (vs. 0.6 V/µs), 45 MHz gain bandwidth product (vs. 1 MHz), and 4 µA input bias current (vs. 200 nA). These differences may cause circuit behavior changes, particularly in applications sensitive to slew rate or bandwidth. Use LT1208CS8#PBF only when higher performance is required or when circuit analysis confirms compatibility.

Q5: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed (MC1458DT, OP221GSZ variants, LT1208CS8 variants, MC33078DT, MC33078YDT, TL062CD, TL062CDT) are RoHS3 compliant and REACH unaffected. All parts maintain MSL 1 (Unlimited) moisture sensitivity level, matching the original TL322CDRG4 specification.

Q6: Which substitute part has the lowest power consumption?

A: TL062CD and TL062CDT have the lowest supply current at 200 µA per channel (x2 channels = 400 µA total). These J-FET input parts are optimized for low-power applications. OP221GSZ variants consume 850 µA per channel (x2 channels = 1.7 mA total). All other substitutes consume higher supply current. Select TL062CD or TL062CDT for power-sensitive applications.

Q7: What is the temperature range limitation for TL322CDRG4 substitution?

A: The original TL322CDRG4 operates from 0°C to 70°C. Most substitute parts (MC1458DT, LT1208CS8 variants) maintain this identical range. However, OP221GSZ variants extend to -55°C to 125°C, and MC33078DT/MC33078YDT extend to -40°C to 105°C. If the application requires operation below 0°C or above 70°C, select OP221GSZ variants or MC33078 variants accordingly.

Q8: Is the 8-SOIC package pinout identical across all substitute parts?

A: Yes. All substitute parts use the standard 8-SOIC (0.154", 3.90mm Width) package with identical pinout. Pin-to-pin substitution is possible without PCB modification. However, verify that the specific application does not depend on unique electrical characteristics of the original part before substitution.

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