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OPA134PAG4 Audio Amplifier Equivalent & Substitute Parts
Part Overview
The OPA134PAG4 is a single-circuit audio amplifier integrated circuit manufactured by Texas Instruments, housed in an 8-DIP through-hole package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The OPA134PAG4 operates across a wide supply voltage range of 5V to 36V with a slew rate of 20V/µs and gain bandwidth product of 8 MHz, making it suitable for audio signal conditioning applications requiring low input bias current and low input offset voltage.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Amplifier Type | Audio | — |
| Number of Circuits | 1 | — |
| Slew Rate | 20 | V/µs |
| Gain Bandwidth Product | 8 | MHz |
| Current - Input Bias | 5 | pA |
| Voltage - Input Offset | 500 | µV |
| Current - Supply | 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 |
| Package / Case | 8-DIP (0.300", 7.62mm) | — |
| Mounting Type | Through Hole | — |
| RoHS Status | ROHS3 Compliant | — |
Substitute Part Grouping Explanation
Substitution of the OPA134PAG4 is determined by strict alignment of electrical and mechanical parameters within the audio amplifier category. The following criteria establish valid substitute relationships:
Primary Substitution Criteria:
- Package / Case: 8-DIP (0.300", 7.62mm) — mandatory for through-hole compatibility
- Mounting Type: Through Hole — required for PCB assembly compatibility
- Number of Circuits: 1 — functional equivalence
- Voltage - Supply Span: Minimum 5V and maximum ≥36V — operational range compatibility
- Operating Temperature Range: Must support -40°C to 85°C or equivalent industrial range
- RoHS Status: ROHS3 Compliant — regulatory compliance
Secondary Electrical Parameters for Functional Compatibility:
- Slew Rate: 20V/µs or higher — signal fidelity preservation
- Gain Bandwidth Product: 8 MHz or higher — frequency response capability
- Current - Input Bias: ≤5 pA — input impedance characteristics
- Voltage - Input Offset: ≤500 µV — DC accuracy
- Current - Supply: ≤4 mA — power consumption
- Current - Output / Channel: ≥35 mA — output drive capability
Substitute parts are grouped by amplifier type (Audio, J-FET, Voltage Feedback) and evaluated for parameter compliance. Parts meeting all primary criteria and maintaining secondary electrical parameters within acceptable ranges are classified as direct substitutes.
Parameter Comparison
| Parameter | OPA134PAG4 | OPA134PA | AD711JNZ | LT1022CN8#PBF | LT1360CN8#PBF | LT1792CN8#PBF | LT1792IN8#PBF |
|---|---|---|---|---|---|---|---|
| Manufacturer | Texas Instruments | Texas Instruments | Analog Devices Inc. | Analog Devices Inc. | Analog Devices Inc. | Analog Devices Inc. | Analog Devices Inc. |
| Amplifier Type | Audio | Audio | J-FET | J-FET | Voltage Feedback | J-FET | J-FET |
| Number of Circuits | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| Slew Rate (V/µs) | 20 | 20 | 20 | 24 | 800 | 3.4 | 3.4 |
| Gain Bandwidth Product (MHz) | 8 | 8 | 4 | 8 | 50 | 5.6 | 5.6 |
| Current - Input Bias (pA) | 5 | 5 | 15 | 30 | 300 | 300 | 300 |
| Voltage - Input Offset (µV) | 500 | 500 | 300 | 100 | 300 | 200 | 200 |
| Current - Supply (mA) | 4 | 4 | 2.5 | 7 | 4 | 4.2 | 4.2 |
| Current - Output / Channel (mA) | 35 | 35 | 25 | — | 34 | — | — |
| Voltage - Supply Span Min (V) | 5 | 5 | 9 | 20 | 5 | 9 | 9 |
| Voltage - Supply Span Max (V) | 36 | 36 | 36 | 36 | 30 | 40 | 40 |
| Operating Temperature Range (°C) | -40 to 85 | -40 to 85 | 0 to 70 | 0 to 70 | 0 to 70 | 0 to 70 | -40 to 85 |
| Package / Case | 8-DIP (0.300", 7.62mm) | 8-DIP (0.300", 7.62mm) | 8-DIP (0.300", 7.62mm) | 8-DIP (0.300", 7.62mm) | 8-DIP (0.300", 7.62mm) | 8-DIP (0.300", 7.62mm) | 8-DIP (0.300", 7.62mm) |
| Mounting Type | Through Hole | Through Hole | Through Hole | Through Hole | Through Hole | Through Hole | Through Hole |
| Product Status | Obsolete | Active | Active | Active | Active | Active | Active |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
Engineering Selection Recommendations
OPA134PA (Texas Instruments)
OPA134PA is the direct successor to OPA134PAG4 within the Texas Instruments product line. It maintains identical electrical specifications (20V/µs slew rate, 8 MHz gain bandwidth product, 5 pA input bias current, 500 µV input offset voltage) and identical package configuration (8-DIP through-hole). OPA134PA is classified as Active product status, ensuring long-term availability and supply chain continuity. Both parts are ROHS3 Compliant and REACH Unaffected. This part is the primary recommendation for direct replacement in existing designs.
LT1792IN8#PBF (Analog Devices Inc.)
LT1792IN8#PBF is a J-FET amplifier that meets the extended operating temperature range requirement (-40°C to 85°C), matching the OPA134PAG4 specification. It maintains the 8-DIP through-hole package and supports supply voltages from 9V to 40V. While the slew rate (3.4V/µs) and gain bandwidth product (5.6 MHz) are lower than the original part, this device is suitable for audio applications where these reduced performance parameters are acceptable. LT1792IN8#PBF is Active product status and ROHS3 Compliant.
AD711JNZ (Analog Devices Inc.)
AD711JNZ is a J-FET amplifier in 8-DIP through-hole package with 20V/µs slew rate matching the original part. However, the operating temperature range is limited to 0°C to 70°C, which does not meet the -40°C to 85°C requirement of OPA134PAG4. Additionally, the minimum supply voltage is 9V, exceeding the 5V minimum of the original part. This device is suitable only for applications where the reduced temperature range and higher minimum supply voltage are acceptable. AD711JNZ is Active product status and ROHS3 Compliant.
LT1022CN8#PBF (Analog Devices Inc.)
LT1022CN8#PBF is a J-FET amplifier with 24V/µs slew rate and 8 MHz gain bandwidth product. The minimum supply voltage requirement is 20V, which exceeds the 5V minimum of OPA134PAG4, making this device unsuitable for low-voltage applications. The operating temperature range is 0°C to 70°C, not meeting the extended range requirement. LT1022CN8#PBF is Active product status and ROHS3 Compliant. Selection is limited to applications with 20V minimum supply voltage and standard temperature range.
LT1360CN8#PBF (Analog Devices Inc.)
LT1360CN8#PBF is a voltage feedback amplifier with significantly higher performance specifications (800V/µs slew rate, 50 MHz gain bandwidth product). The maximum supply voltage is 30V, which is below the 36V maximum of OPA134PAG4. The operating temperature range is 0°C to 70°C, not meeting the extended range requirement. This device is suitable only for high-speed audio applications where the reduced supply voltage range and standard temperature range are acceptable. LT1360CN8#PBF is Active product status and ROHS3 Compliant.
LT1792CN8#PBF (Analog Devices Inc.)
LT1792CN8#PBF is a J-FET amplifier with identical specifications to LT1792IN8#PBF except for operating temperature range (0°C to 70°C instead of -40°C to 85°C). This device does not meet the extended temperature range requirement of OPA134PAG4. Selection is limited to applications operating within 0°C to 70°C. LT1792CN8#PBF is Active product status and ROHS3 Compliant.
Frequently Asked Questions (FAQ)
Q: Can OPA134PA be used as a direct replacement for OPA134PAG4?
A: Yes. OPA134PA is the active product successor to OPA134PAG4. Both parts share identical electrical specifications (20V/µs slew rate, 8 MHz gain bandwidth product, 5 pA input bias current, 500 µV input offset voltage), identical 8-DIP through-hole package configuration, and identical supply voltage range (5V to 36V). OPA134PA is the recommended primary substitute.
Q: What is the key difference between OPA134PAG4 and the J-FET alternatives (AD711JNZ, LT1022CN8#PBF, LT1792CN8#PBF, LT1792IN8#PBF)?
A: The OPA134PAG4 is classified as an Audio amplifier type, while the J-FET alternatives (AD711JNZ, LT1022CN8#PBF, LT1792CN8#PBF, LT1792IN8#PBF) are J-FET amplifier types. J-FET amplifiers offer different input impedance and noise characteristics compared to audio amplifiers. Substitution requires verification that the application circuit design is compatible with J-FET input stage characteristics.
Q: Why does LT1360CN8#PBF have a lower maximum supply voltage (30V) compared to OPA134PAG4 (36V)?
A: LT1360CN8#PBF is a voltage feedback amplifier designed for higher-speed applications (800V/µs slew rate, 50 MHz gain bandwidth product). The reduced maximum supply voltage is a design characteristic of this device class. Applications requiring 36V maximum supply voltage cannot use LT1360CN8#PBF.
Q: Which substitute parts support the full -40°C to 85°C operating temperature range of OPA134PAG4?
A: Only OPA134PA and LT1792IN8#PBF support the full -40°C to 85°C operating temperature range. All other substitute parts are limited to 0°C to 70°C. For applications requiring extended temperature operation, selection is restricted to these two devices.
Q: Can LT1792CN8#PBF and LT1792IN8#PBF be used interchangeably?
A: LT1792CN8#PBF and LT1792IN8#PBF have identical electrical specifications and package configuration. The only difference is operating temperature range: LT1792CN8#PBF operates 0°C to 70°C, while LT1792IN8#PBF operates -40°C to 85°C. Selection depends on the application temperature requirements.
Q: What is the minimum supply voltage requirement for each substitute part?
A: OPA134PA: 5V; AD711JNZ: 9V; LT1022CN8#PBF: 20V; LT1360CN8#PBF: 5V; LT1792CN8#PBF: 9V; LT1792IN8#PBF: 9V. Applications with 5V supply voltage can only use OPA134PA or LT1360CN8#PBF.
Q: Are all substitute parts ROHS3 Compliant?
A: Yes. All substitute parts listed (OPA134PA, AD711JNZ, LT1022CN8#PBF, LT1360CN8#PBF, LT1792CN8#PBF, LT1792IN8#PBF) are ROHS3 Compliant and REACH Unaffected, meeting current regulatory requirements.
Q: What is the significance of the gain bandwidth product difference between OPA134PAG4 (8 MHz) and LT1792CN8#PBF / LT1792IN8#PBF (5.6 MHz)?
A: Gain bandwidth product determines the frequency response capability of the amplifier. LT1792CN8#PBF and LT1792IN8#PBF have a lower gain bandwidth product (5.6 MHz vs. 8 MHz), which may limit high-frequency performance in audio applications. Substitution requires verification that the application circuit operates within the reduced bandwidth specification.
Q: Why is LT1022CN8#PBF not recommended for most applications?
A: LT1022CN8#PBF has a minimum supply voltage requirement of 20V, which exceeds the 5V minimum of OPA134PAG4. This device is incompatible with low-voltage applications. Additionally, the operating temperature range (0°C to 70°C) does not meet the extended range requirement. Selection is limited to applications with 20V minimum supply voltage and standard temperature operation.
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