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OPA704PA Equivalent & Substitute Parts
Part Overview
The OPA704PA is a general-purpose operational amplifier manufactured by Texas Instruments, housed in an 8-PDIP through-hole package. This device features rail-to-rail output capability with a 3 MHz gain bandwidth product and 3 V/µs slew rate, designed for single-circuit amplification applications across industrial and consumer electronics. The OPA704PA holds an obsolete product status, making equivalent and substitute parts necessary for ongoing design support and component procurement.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Amplifier Type | General Purpose | — |
| Number of Circuits | 1 | — |
| Output Type | Rail-to-Rail | — |
| Slew Rate | 3 | V/µs |
| Gain Bandwidth Product | 3 | MHz |
| Current - Input Bias | 1 | pA |
| Voltage - Input Offset | 160 | µV |
| Current - Supply | 160 | µA |
| Current - Output / Channel | 10 | mA |
| Voltage - Supply Span (Min) | 4 | V |
| Voltage - Supply Span (Max) | 12 | V |
| Operating Temperature | -40 to 85 | °C |
| Mounting Type | Through Hole | — |
| Package / Case | 8-DIP (0.300", 7.62mm) | — |
| RoHS Status | ROHS3 Compliant | — |
| Product Status | Obsolete | — |
Substitute Part Grouping Explanation
Substitution eligibility for the OPA704PA is determined by the following critical parameters:
Primary Compatibility Criteria:
- Package / Case: 8-DIP (0.300", 7.62mm) through-hole mounting
- Amplifier Type: General Purpose
- Number of Circuits: 1
- Output Type: Rail-to-Rail
- Voltage - Supply Span (Min): 4 V minimum
- Voltage - Supply Span (Max): 12 V maximum
Secondary Performance Parameters:
- Slew Rate: 3 V/µs (OPA704PA specification)
- Gain Bandwidth Product: 3 MHz (OPA704PA specification)
- Current - Input Bias: 1 pA (OPA704PA specification)
- Voltage - Input Offset: 160 µV (OPA704PA specification)
- Current - Supply: 160 µA (OPA704PA specification)
- Current - Output / Channel: 10 mA (OPA704PA specification)
Substitute parts must maintain mechanical compatibility (8-DIP package, through-hole mounting) and functional equivalence within the specified electrical parameter ranges. Parts are grouped by manufacturer and performance tier based on these criteria.
Parameter Comparison
| Part Number | Manufacturer | Slew Rate (V/µs) | GBW (MHz) | Input Bias (pA) | Input Offset (µV) | Supply Current (µA) | Output Current (mA) | Supply Min (V) | Supply Max (V) | Temp Range (°C) | Status |
|---|---|---|---|---|---|---|---|---|---|---|---|
| OPA704PA | Texas Instruments | 3.0 | 3.0 | 1 | 160 | 160 | 10 | 4 | 12 | -40 to 85 | Obsolete |
| ALD1702APAL | Advanced Linear Devices | 2.8 | 1.5 | 1 | 900 | 1100 | 8 | 4 | 10 | 0 to 70 | Active |
| ALD1702BPAL | Advanced Linear Devices | 2.8 | 1.7 | 1 | 2000 | 1100 | 8 | 4 | 12 | 0 to 70 | Active |
| ALD1702PAL | Advanced Linear Devices | 2.8 | 1.5 | 1 | 4500 | 1100 | 8 | 4 | 10 | 0 to 70 | Active |
| ALD1703PAL | Advanced Linear Devices | 2.8 | 1.7 | 1 | 10000 | 1100 | 8 | 4 | 12 | 0 to 70 | Active |
| ALD1712APAL | Advanced Linear Devices | 2.8 | 1.7 | 0.01 | 50 | 800 | 8 | 4 | 12 | 0 to 70 | Active |
| ALD1712BPAL | Advanced Linear Devices | 2.8 | 1.7 | 0.01 | 100 | 800 | 8 | 4 | 12 | 0 to 70 | Active |
| ALD1712PAL | Advanced Linear Devices | 2.8 | 1.5 | 0.01 | 250 | 800 | 8 | 4 | 10 | 0 to 70 | Active |
| OPA704UA | Burr Brown | 3.0 | 3.0 | 1 | 160 | 160 | 10 | 4 | 12 | -40 to 85 | Active |
| TLC2654CP | Texas Instruments | 3.7 | 1.9 | 50 | 5 | 1500 | 50 | 4.6 | 16 | 0 to 70 | Last Time Buy |
Engineering Selection Recommendations
Direct Equivalent (Identical Electrical Performance):
The OPA704UA manufactured by Burr Brown provides direct electrical equivalence to the OPA704PA. Both devices share identical slew rate (3.0 V/µs), gain bandwidth product (3.0 MHz), input bias current (1 pA), input offset voltage (160 µV), supply current (160 µA), and output current (10 mA). The OPA704UA maintains the same supply voltage range (4 V to 12 V) and operating temperature range (-40°C to 85°C). The primary difference is packaging: OPA704UA uses 8-SOIC surface-mount configuration versus the 8-DIP through-hole package of OPA704PA. The OPA704UA holds active product status with ROHS3 compliance and is suitable for direct replacement in applications where surface-mount technology is acceptable.
Active Substitutes with Performance Trade-offs:
The ALD1712 series (ALD1712APAL, ALD1712BPAL, ALD1712PAL) from Advanced Linear Devices offers active product status with enhanced input bias current performance (0.01 pA versus 1 pA). These devices maintain 8-DIP through-hole packaging and 4 V to 12 V supply range compatibility. Trade-offs include reduced slew rate (2.8 V/µs versus 3.0 V/µs), lower gain bandwidth product (1.5–1.7 MHz versus 3.0 MHz), and reduced output current capability (8 mA versus 10 mA). Input offset voltage varies across the series (50 µV to 250 µV). Operating temperature range is restricted to 0°C to 70°C. These substitutes are suitable for applications where lower input bias current is beneficial and reduced bandwidth is acceptable.
The ALD1702 series (ALD1702APAL, ALD1702BPAL, ALD1702PAL) and ALD1703PAL provide similar performance profiles to the ALD1712 series with active status. These devices feature 1 pA input bias current matching the OPA704PA, but with higher input offset voltages (900 µV to 10 mV) and reduced bandwidth (1.5–1.7 MHz). Supply voltage range varies: ALD1702APAL and ALD1702PAL support 4 V to 10 V, while ALD1702BPAL and ALD1703PAL support 4 V to 12 V. Operating temperature is limited to 0°C to 70°C.
Limited Substitution (Significant Parameter Deviation):
The TLC2654CP from Texas Instruments holds Last Time Buy status and exhibits significant parameter deviations. While it maintains 8-DIP through-hole packaging and ROHS3 compliance, it features higher input bias current (50 pA), lower input offset voltage (5 µV), higher supply current (1.5 mA), and substantially higher output current (50 mA). The gain bandwidth product (1.9 MHz) is lower than OPA704PA. Supply voltage range extends to 16 V maximum. Operating temperature is restricted to 0°C to 70°C. This device is suitable only for applications where higher output current capability is required and the parameter deviations are acceptable.
Frequently Asked Questions (FAQ)
Q: Can the OPA704UA replace the OPA704PA in existing designs?
A: The OPA704UA provides complete electrical equivalence to the OPA704PA. The primary consideration is packaging: OPA704UA uses 8-SOIC surface-mount technology while OPA704PA uses 8-DIP through-hole. Direct PCB replacement is not possible without redesign. However, OPA704UA is electrically suitable for new designs or retrofits where surface-mount assembly is available.
Q: What are the key differences between OPA704PA and the ALD1712 series?
A: The ALD1712 series maintains 8-DIP through-hole compatibility and 4 V to 12 V supply range. Primary differences include: slew rate reduced from 3.0 V/µs to 2.8 V/µs, gain bandwidth product reduced from 3.0 MHz to 1.5–1.7 MHz, input bias current improved from 1 pA to 0.01 pA, and output current reduced from 10 mA to 8 mA. Operating temperature range is restricted to 0°C to 70°C. These trade-offs make the ALD1712 series suitable for low-bias-current applications where reduced bandwidth is acceptable.
Q: Is the TLC2654CP a suitable substitute for OPA704PA?
A: The TLC2654CP maintains 8-DIP through-hole packaging and ROHS3 compliance but exhibits significant parameter deviations. Input bias current is 50 times higher (50 pA versus 1 pA), gain bandwidth product is lower (1.9 MHz versus 3.0 MHz), and output current is 5 times higher (50 mA versus 10 mA). The TLC2654CP is suitable only for applications requiring higher output current capability where these parameter differences are acceptable. Last Time Buy status indicates limited future availability.
Q: What is the operating temperature impact when substituting with ALD1702 or ALD1712 series?
A: The ALD1702 and ALD1712 series are restricted to 0°C to 70°C operating temperature, compared to OPA704PA's -40°C to 85°C range. Substitution is not suitable for applications requiring extended temperature operation below 0°C or above 70°C. Verify application temperature requirements before selection.
Q: Are all substitute parts ROHS3 compliant?
A: Yes. All substitute parts listed (ALD1702 series, ALD1703PAL, ALD1712 series, OPA704UA, and TLC2654CP) maintain ROHS3 compliance. All are REACH Unaffected and classified as EAR99 for export control purposes.
Q: What is the inventory status of substitute parts?
A: ALD1712APAL (740 pcs), ALD1712BPAL (731 pcs), ALD1712PAL (775 pcs), ALD1702APAL (951 pcs), ALD1702BPAL (1025 pcs), ALD1702PAL (724 pcs), ALD1703PAL (1093 pcs), OPA704UA (2216 pcs), and TLC2654CP (803 pcs) are available in stock. OPA704PA (1949 pcs) remains available despite obsolete status.
Q: Can ALD1702 and ALD1712 series be used interchangeably?
A: Both series maintain 8-DIP through-hole packaging and 4 V supply minimum. However, they differ in input bias current (ALD1702: 1 pA; ALD1712: 0.01 pA), input offset voltage specifications, and supply voltage maximum (ALD1702APAL/PAL: 10 V; ALD1702BPAL/ALD1712: 12 V). Selection depends on specific application requirements for bias current, offset voltage, and supply voltage range.
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