OPA2134PA Equivalent & Substitute Parts

Part Overview

The OPA2134PA is a dual-channel audio amplifier integrated circuit manufactured by Texas Instruments in the SoundPlus™ series. This device is classified as a linear audio amplifier in 8-PDIP through-hole packaging. The OPA2134PA has reached Last Time Buy status, indicating that Texas Instruments has discontinued this product line. Identifying equivalent and substitute parts is necessary for design continuity, procurement planning, and long-term product support in applications requiring audio amplification functionality.

Key Parameters

Parameter	Value	Unit
Amplifier Type	Audio	—
Number of Circuits	2	Channels
Slew Rate	20	V/µs
Gain Bandwidth Product	8	MHz
Current - Input Bias	5	pA
Voltage - Input Offset	500	µV
Current - Supply (per channel)	4	mA
Current - Output / Channel	35	mA
Voltage - Supply Span (Min)	5	V
Voltage - Supply Span (Max)	36	V
Operating Temperature Range	-40 to 85	°C
Mounting Type	Through Hole	—
Package / Case	8-DIP (0.300", 7.62mm)	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the OPA2134PA is determined by the following critical parameters:

Primary Substitution Criteria:

Amplifier Type (Audio vs. J-FET)
Number of Circuits (2 channels required)
Package Type (8-DIP through-hole form factor)
Voltage Supply Range compatibility (minimum 5V to maximum 36V overlap)
Operating Temperature Range (-40°C to 85°C coverage)
Slew Rate and Gain Bandwidth Product (performance envelope)
Current Supply and Output specifications

Substitution Categories:

Category 1: Direct Electrical Equivalent (Same Amplifier Type) The OPA2134UA/2K5 is the manufacturer-recommended direct equivalent. It maintains identical electrical specifications but differs in packaging format (8-SOIC surface mount instead of 8-DIP through hole). This substitute is suitable only for new designs using surface-mount assembly.

Category 2: Through-Hole Audio Amplifiers (Functional Equivalents) The MUSES8820D and OP275GPZ are dual-channel audio amplifiers in 8-DIP through-hole packaging. These devices maintain the same physical form factor as the OPA2134PA and operate within compatible voltage supply ranges. Performance characteristics (slew rate, bandwidth, output current) differ but remain within acceptable ranges for audio amplification applications.

Category 3: J-FET Amplifiers (Alternative Technology) The AD746JNZ, LT1057CN8#PBF, LT1113ACN8#PBF, LT1113CN8#PBF, and LT1169CN8#PBF are J-FET input amplifiers in 8-DIP through-hole packaging. These devices offer superior input bias current characteristics and operate within overlapping voltage supply ranges. J-FET technology provides different noise and distortion profiles compared to the audio-optimized OPA2134PA.

Parameter Comparison

Part Number	Manufacturer	Amplifier Type	Slew Rate (V/µs)	GBW (MHz)	Input Bias (pA)	Input Offset (µV)	Supply Current (mA)	Output Current (mA)	Voltage Min (V)	Voltage Max (V)	Temp Range (°C)	Package	Status
OPA2134PA	Texas Instruments	Audio	20	8	5	500	4	35	5	36	-40 to 85	8-DIP	Last Time Buy
OPA2134UA/2K5	Texas Instruments	Audio	20	8	5	500	4	35	5	36	-40 to 85	8-SOIC	Active
AD746JNZ	Analog Devices Inc.	J-FET	75	13	110	300	7	25	9	36	0 to 70	8-DIP	Active
LT1057CN8#PBF	Analog Devices Inc.	J-FET	13	5	7	200	1.7	—	20	36	0 to 70	8-DIP	Active
LT1113ACN8#PBF	Analog Devices Inc.	J-FET	3.9	5.6	300	450	5.3	—	9	40	-40 to 85	8-DIP	Active
LT1113CN8#PBF	Analog Devices Inc.	J-FET	3.9	5.6	300	550	5.3	—	9	40	-40 to 85	8-DIP	Active
LT1169CN8#PBF	Analog Devices Inc.	J-FET	4.2	5.3	4	600	5.3	—	9	40	0 to 70	8-DIP	Active
MUSES8820D	Nisshinbo Micro Devices Inc.	Audio	5	11	100	300	8	50	7	32	-40 to 85	8-DIP	Active
OP275GPZ	Analog Devices Inc.	Audio	22	9	100	1000	4	90	9	44	-40 to 85	8-DIP	Active

Engineering Selection Recommendations

For Direct Replacement in Through-Hole Designs:

The MUSES8820D and OP275GPZ are the primary candidates for direct through-hole replacement of the OPA2134PA. Both devices are active products with ROHS3 compliance and maintain the 8-DIP form factor. The MUSES8820D operates within a 7V to 32V supply range, which encompasses the OPA2134PA's 5V to 36V range. The OP275GPZ extends the maximum supply voltage to 44V and provides higher output current capability (90 mA vs. 35 mA). Both devices support the full -40°C to 85°C operating temperature range required by the OPA2134PA.

For Surface-Mount Redesigns:

The OPA2134UA/2K5 is the manufacturer-recommended equivalent and maintains identical electrical specifications. This part is suitable only for designs transitioning to surface-mount assembly using 8-SOIC packaging. The OPA2134UA/2K5 is currently in active production status with higher inventory availability (24,900 units).

For Low-Bias-Current Applications:

The LT1169CN8#PBF offers the lowest input bias current (4 pA) among all substitutes and maintains through-hole 8-DIP packaging. This device is suitable for applications requiring minimal input bias current while operating within 0°C to 70°C temperature range. The LT1169CN8#PBF operates within a 9V to 40V supply range, which overlaps with the OPA2134PA specification.

For Extended Temperature Range with J-FET Technology:

The LT1113ACN8#PBF and LT1113CN8#PBF both support the full -40°C to 85°C operating temperature range and provide J-FET input characteristics. These devices are suitable for applications where superior input bias current performance is required across the extended temperature range.

Compliance and Certification:

All recommended substitutes maintain ROHS3 compliance and REACH unaffected status, matching the OPA2134PA regulatory requirements. All parts carry EAR99 ECCN classification and HTSUS code 8542.33.0001.

Frequently Asked Questions (FAQ)

Q: Can the OPA2134UA/2K5 be used as a direct replacement for the OPA2134PA?

A: The OPA2134UA/2K5 is electrically identical to the OPA2134PA but uses 8-SOIC surface-mount packaging instead of 8-DIP through-hole packaging. Direct board-level substitution is not possible without PCB redesign. This part is suitable only for new designs or board revisions using surface-mount assembly.

Q: What is the primary difference between audio amplifiers and J-FET amplifiers in this comparison?

A: Audio amplifiers (OPA2134PA, MUSES8820D, OP275GPZ) are optimized for audio frequency applications with emphasis on low distortion and noise characteristics. J-FET amplifiers (AD746JNZ, LT1057CN8#PBF, LT1113 series, LT1169CN8#PBF) feature extremely low input bias current and are suitable for high-impedance signal sources. The choice depends on application requirements.

Q: Can I use the AD746JNZ as a replacement if my circuit operates at 0°C to 70°C?

A: Yes. The AD746JNZ operates within the 0°C to 70°C temperature range and is compatible with the OPA2134PA's 5V to 36V supply range (AD746JNZ supports 9V to 36V). However, the AD746JNZ has a higher input bias current (110 pA vs. 5 pA) and different slew rate (75 V/µs vs. 20 V/µs), which may affect circuit performance depending on application requirements.

Q: Why does the MUSES8820D have a lower maximum supply voltage (32V) than the OPA2134PA (36V)?

A: The MUSES8820D is specified with a maximum supply voltage of 32V, which is lower than the OPA2134PA's 36V maximum. If your circuit requires operation at 33V to 36V, the MUSES8820D is not suitable. The OP275GPZ, with a 44V maximum rating, is a better choice for higher supply voltage applications.

Q: Are all substitute parts available in the same tube packaging as the OPA2134PA?

A: All substitute parts listed are available in tube packaging except the OPA2134UA/2K5, which is supplied in Cut Tape (CT) and Digi-Reel® format. Tube packaging is standard for through-hole 8-DIP devices (MUSES8820D, OP275GPZ, AD746JNZ, LT1057CN8#PBF, LT1113 series, LT1169CN8#PBF).

Q: What is the significance of the LT1169CN8#PBF's 4 pA input bias current?

A: The 4 pA input bias current is exceptionally low and suitable for applications with high-impedance signal sources where input bias current can introduce significant errors. This specification makes the LT1169CN8#PBF ideal for precision measurement and audio applications requiring minimal input loading.

Q: Can I mix OPA2134PA and substitute parts in the same circuit?

A: Mixing different amplifier types in the same circuit is not recommended without thorough circuit analysis. Different input bias currents, offset voltages, slew rates, and frequency responses will produce inconsistent performance across channels. Use identical part numbers for matched-pair applications.

Q: What is the moisture sensitivity level (MSL) and why does it matter?

A: The OPA2134PA has MSL Not Applicable, indicating it is not moisture-sensitive. Most substitute parts have MSL 1 (Unlimited) or MSL 2 (1 Year), which are favorable ratings. Lower MSL values indicate less stringent moisture control requirements during storage and handling.

Q: Is the LT1057CN8#PBF suitable for audio applications?

A: The LT1057CN8#PBF is a J-FET amplifier with a 5 MHz gain-bandwidth product and 13 V/µs slew rate. While it can function in audio circuits, its lower bandwidth and slew rate compared to the OPA2134PA (8 MHz, 20 V/µs) may limit high-frequency audio performance. Application-specific testing is necessary to determine suitability.

Q: Why is the OPA2134PA listed as Last Time Buy?

A: Last Time Buy status indicates that Texas Instruments has discontinued this product and will no longer manufacture it after a specified date. Existing inventory will be depleted, and no future production is planned. Identifying and qualifying substitute parts is essential for long-term product support and supply chain continuity.

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