TL322CDRE4 Equivalent & Substitute Parts

Part Overview

The TL322CDRE4 is a general-purpose operational amplifier manufactured by Texas Instruments, configured as a dual-circuit (2-channel) device in an 8-SOIC surface-mount package. This component is classified as obsolete, indicating discontinued production and limited availability in the market. The part operates across a supply voltage range of 5V to 30V with an operating temperature range of 0°C to 70°C, making it suitable for standard industrial and commercial applications requiring dual op-amp functionality.

Due to its obsolete status, identifying functionally equivalent substitute parts is essential for design continuity, production planning, and long-term component sourcing. Substitute parts must maintain compatibility across critical electrical parameters including supply voltage range, package form factor, circuit count, and thermal operating range.

Key Parameters

Parameter	Value	Unit
Manufacturer Part Number	TL322CDRE4	—
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	—
Voltage - Supply Span (Min)	5	V
Voltage - Supply Span (Max)	30	V
Operating Temperature	0 to 70	°C
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
Product Status	Obsolete	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute parts for the TL322CDRE4 are selected based on strict compatibility across the following critical parameters:

Primary Compatibility Criteria:

Package / Case: 8-SOIC (0.154", 3.90mm Width) — mechanical and thermal interface compatibility
Number of Circuits: 2 — functional equivalence for dual-channel applications
Voltage - Supply Span: 5V minimum to 30V maximum — power supply compatibility
Mounting Type: Surface Mount — PCB assembly process compatibility
Amplifier Type: General Purpose — functional classification

Secondary Compatibility Considerations:

Operating Temperature Range: Minimum 0°C to 70°C coverage required
RoHS3 Compliance and MSL Level 1 — regulatory and handling compatibility

Substitute parts are grouped into two categories based on amplifier technology:

Category A: General-Purpose BJT Amplifiers — Direct functional replacements with similar gain-bandwidth and slew-rate characteristics. Includes LT1208CS8#PBF, LT1208CS8#TRPBF, MC1458DT, MC33078DT, MC33078YDT, and OP221GSZ variants.

Category B: J-FET Input Amplifiers — Alternative topology with significantly lower input bias current (30 pA vs. 200 nA). Includes TL062CD and TL062CDT, suitable for applications requiring ultra-low input bias current.

Parameter Comparison

Parameter	TL322CDRE4	LT1208CS8#PBF	MC1458DT	MC33078DT	OP221GSZ-REEL7	TL062CDT
Manufacturer	Texas Instruments	Analog Devices Inc.	STMicroelectronics	STMicroelectronics	Analog Devices Inc.	STMicroelectronics
Number of Circuits	2	2	2	2	2	2
Package / Case	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC
Voltage - Supply Span (Min)	5 V	5 V	5 V	5 V	5 V	6 V
Voltage - Supply Span (Max)	30 V	30 V	30 V	30 V	30 V	36 V
Operating Temperature (Min)	0°C	0°C	0°C	-40°C	-55°C	0°C
Operating Temperature (Max)	70°C	70°C	70°C	105°C	125°C	70°C
Slew Rate	0.6 V/µs	400 V/µs	0.8 V/µs	7 V/µs	0.3 V/µs	3.5 V/µs
Gain Bandwidth Product	1 MHz	45 MHz	1 MHz	15 MHz	600 kHz (-3dB)	1 MHz
Current - Input Bias	200 nA	4 µA	30 nA	250 nA	70 nA	30 pA
Voltage - Input Offset	2 mV	1 mV	1 mV	150 µV	250 µV	3 mV
Current - Supply	1.4 mA (x2)	7 mA (x2)	2.3 mA	4 mA	850 µA (x2)	200 µA (x2)
Current - Output / Channel	10 mA	40 mA	25 mA	37 mA	—	20 mA
Product Status	Obsolete	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Amplifier Type	General Purpose	General Purpose	General Purpose	General Purpose	General Purpose	J-FET

Engineering Selection Recommendations

For Direct Functional Replacement (BJT General-Purpose Category):

MC1458DT is the closest electrical match to TL322CDRE4, offering identical slew rate (0.8 V/µs vs. 0.6 V/µs) and gain-bandwidth product (1 MHz), with superior input bias current (30 nA vs. 200 nA) and lower input offset voltage (1 mV vs. 2 mV). Both parts maintain the same supply voltage range (5V to 30V) and operating temperature span (0°C to 70°C). MC1458DT is manufactured by STMicroelectronics and carries active product status with ROHS3 compliance and MSL Level 1 rating, ensuring long-term availability and regulatory compliance.

OP221GSZ-REEL7 provides an alternative with extended operating temperature range (-55°C to 125°C) and lower supply current (850 µA x2 channels vs. 1.4 mA x2 channels), beneficial for power-constrained applications. However, it exhibits reduced slew rate (0.3 V/µs) and lower gain-bandwidth product (600 kHz -3dB), which may impact high-frequency performance.

For Enhanced Performance Applications:

MC33078DT and MC33078YDT offer significantly improved slew rate (7 V/µs) and gain-bandwidth product (15 MHz), with extended operating temperature range (-40°C to 105°C) and automotive-grade qualification (AEC-Q100). These parts are suitable for applications requiring higher bandwidth and thermal robustness. MC33078YDT provides identical electrical specifications with higher inventory availability (7,800 pcs vs. 133,465 pcs for MC33078DT).

LT1208CS8#PBF and LT1208CS8#TRPBF deliver the highest performance envelope with 400 V/µs slew rate and 45 MHz gain-bandwidth product, appropriate for precision signal conditioning and high-speed applications. These parts require higher supply current (7 mA x2 channels) and exhibit elevated input bias current (4 µA), which may necessitate circuit design modifications.

For Ultra-Low Input Bias Current Applications:

TL062CD and TL062CDT employ J-FET input architecture, delivering 30 pA input bias current (approximately 6,700× lower than TL322CDRE4). These parts maintain 1 MHz gain-bandwidth product and 3.5 V/µs slew rate with minimal supply current (200 µA x2 channels). Supply voltage range extends to 36V maximum. These devices are optimal for high-impedance signal sources and precision instrumentation where input bias current leakage is critical.

Compliance and Availability:

All recommended substitute parts carry ROHS3 compliance, MSL Level 1 rating, and active product status, ensuring regulatory alignment and sustained market availability. Selection should prioritize parts with highest inventory levels and established supply chain presence for production continuity.

Frequently Asked Questions (FAQ)

Q1: Can MC1458DT directly replace TL322CDRE4 without circuit modifications?

MC1458DT is mechanically and electrically compatible with TL322CDRE4 across all critical parameters: identical 8-SOIC package, dual-circuit configuration, 5V to 30V supply range, and 0°C to 70°C operating temperature. Pin-to-pin compatibility is maintained. No circuit modifications are required for standard applications. However, improved input bias current (30 nA vs. 200 nA) and lower input offset voltage (1 mV vs. 2 mV) may require bias network recalibration in precision applications.

Q2: What is the primary difference between BJT and J-FET substitute options?

BJT general-purpose amplifiers (MC1458DT, MC33078DT, OP221GSZ-REEL7, LT1208CS8#PBF) offer moderate input bias current (30 nA to 4 µA) and higher output current capability (20 to 40 mA per channel). J-FET amplifiers (TL062CD, TL062CDT) provide ultra-low input bias current (30 pA) with reduced output current (20 mA) and lower supply current consumption (200 µA x2 channels). Select J-FET devices for high-impedance signal sources; select BJT devices for general-purpose and high-current output applications.

Q3: Is OP221GSZ-REEL7 suitable for applications requiring extended temperature operation?

OP221GSZ-REEL7 operates across -55°C to 125°C, exceeding TL322CDRE4's 0°C to 70°C range. However, this part exhibits reduced slew rate (0.3 V/µs vs. 0.6 V/µs) and lower gain-bandwidth product (600 kHz vs. 1 MHz). Extended temperature capability does not compensate for reduced dynamic performance. For applications requiring both extended temperature range and maintained bandwidth, MC33078DT (-40°C to 105°C, 15 MHz) or TL062CDT (0°C to 70°C, 1 MHz) are more appropriate.

Q4: Why does LT1208CS8#PBF show significantly higher slew rate and bandwidth than TL322CDRE4?

LT1208CS8#PBF represents a higher-performance design generation with 400 V/µs slew rate and 45 MHz gain-bandwidth product, compared to TL322CDRE4's 0.6 V/µs and 1 MHz. This enhanced performance requires higher supply current (7 mA x2 channels vs. 1.4 mA x2 channels) and elevated input bias current (4 µA vs. 200 nA). Use LT1208CS8#PBF only when application requirements demand high-speed signal processing; standard applications benefit from lower-power alternatives like MC1458DT.

Q5: Are packaging variants (Tube vs. Tape & Reel) interchangeable?

Packaging variants (Tube, Cut Tape & Digi-Reel, Tape & Reel) differ only in quantity presentation and handling format for automated assembly. Electrical specifications and pin configurations remain identical. LT1208CS8#PBF (Tube) and LT1208CS8#TRPBF (Tape & Reel) are functionally equivalent; selection depends on production volume and assembly equipment compatibility. OP221GSZ (Tube), OP221GSZ-REEL (Tape & Reel), and OP221GSZ-REEL7 (Tape & Reel) are similarly interchangeable.

Q6: What is the significance of AEC-Q100 qualification on MC33078DT and MC33078YDT?

AEC-Q100 qualification indicates automotive-grade reliability testing and temperature cycling validation per automotive industry standards. MC33078DT and MC33078YDT meet extended operating temperature range (-40°C to 105°C) with enhanced reliability documentation. These parts are suitable for automotive, industrial, and mission-critical applications requiring documented quality assurance. Standard commercial-grade substitutes (MC1458DT, OP221GSZ-REEL7) lack this qualification but remain suitable for general industrial and consumer applications.

Q7: How does input offset voltage affect circuit performance?

Input offset voltage represents the DC voltage differential required at the amplifier input to produce zero output voltage. TL322CDRE4 specifies 2 mV maximum offset. Substitute parts range from 150 µV (MC33078DT) to 3 mV (TL062CDT). Lower offset voltage reduces DC error in precision applications (instrumentation, data acquisition). For AC-coupled or high-gain applications, offset voltage becomes negligible. For DC-coupled precision circuits, select MC33078DT (150 µV) or MC1458DT (1 mV) over OP221GSZ-REEL7 (250 µV) or TL062CDT (3 mV).

Q8: Can substitute parts with higher supply voltage maximum (36V for TL062CDT) be used in 30V systems?

Yes. Higher supply voltage maximum rating indicates the part withstands voltages up to 36V without damage. A 30V system operates safely within this specification. TL062CD and TL062CDT (36V maximum) are fully compatible with 5V to 30V supply systems. This extended rating provides design margin and component robustness without requiring circuit modifications.

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