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OPA637AUG4 Equivalent & Substitute Parts
Part Overview
The OPA637AUG4 is a general-purpose operational amplifier manufactured by Texas Instruments, housed in an 8-SOIC surface mount package. This device features the Difet® series architecture and is designed for high-speed, precision signal conditioning applications. The OPA637AUG4 is currently discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives for ongoing design support and component procurement.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Amplifier Type | General Purpose | — |
| Number of Circuits | 1 | — |
| Slew Rate | 135 | V/µs |
| Gain Bandwidth Product | 80 | MHz |
| Current - Input Bias | 2 | pA |
| Voltage - Input Offset | 130 | µV |
| Current - Supply | 7 | mA |
| Current - Output / Channel | 45 | mA |
| Voltage - Supply Span (Min) | 9 | V |
| Voltage - Supply Span (Max) | 36 | V |
| Operating Temperature | -25°C ~ 85°C | — |
| Package / Case | 8-SOIC (0.154", 3.90mm Width) | — |
| Mounting Type | Surface Mount | — |
| RoHS Status | ROHS3 Compliant | — |
Substitute Part Grouping Explanation
Substitution of the OPA637AUG4 is determined by electrical and mechanical compatibility across the following critical parameters:
Primary Substitution Criteria:
- Package / Case: 8-SOIC (0.154", 3.90mm Width)
- Mounting Type: Surface Mount
- Voltage - Supply Span: 9 V minimum to 36 V maximum
- Number of Circuits: 1
- RoHS3 Compliance
Secondary Performance Criteria:
- Slew Rate: 135 V/µs (baseline performance)
- Gain Bandwidth Product: 80 MHz (baseline performance)
- Current - Input Bias: 2 pA (baseline performance)
- Voltage - Input Offset: 130 µV (baseline performance)
- Current - Output / Channel: 45 mA (baseline performance)
Substitute parts are grouped into two categories:
Category 1: Direct Electrical Equivalents — Parts that match or exceed all key electrical parameters while maintaining identical package specifications and supply voltage range.
Category 2: Functional Alternatives — Parts that operate within the same package and supply voltage envelope but with different electrical performance characteristics, suitable for applications where performance trade-offs are acceptable.
Parameter Comparison
| Part Number | Manufacturer | Amplifier Type | Slew Rate (V/µs) | Gain Bandwidth Product (MHz) | Input Bias (pA) | Input Offset (µV) | Supply Current (mA) | Output Current (mA) | Supply Span Min (V) | Supply Span Max (V) | Temp Range (°C) | Package | Product Status |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| OPA637AUG4 | Texas Instruments | General Purpose | 135 | 80 | 2 | 130 | 7 | 45 | 9 | 36 | -25 ~ 85 | 8-SOIC | Discontinued |
| OPA637AU | Burr Brown | General Purpose | 135 | 80 | 2 | 130 | 7 | 45 | 9 | 36 | -25 ~ 85 | 8-SOIC | Active |
| AD711JRZ | Analog Devices Inc. | J-FET | 20 | 4 | 15 | 300 | 2.5 | 25 | 9 | 36 | 0 ~ 70 | 8-SOIC | Active |
| AD711JRZ-REEL | Analog Devices Inc. | J-FET | 20 | 4 | 15 | 300 | 2.5 | 25 | 9 | 36 | 0 ~ 70 | 8-SOIC | Active |
| AD711JRZ-REEL7 | Analog Devices Inc. | J-FET | 20 | 4 | 15 | 300 | 2.5 | 25 | 9 | 36 | 0 ~ 70 | 8-SOIC | Active |
| AD711KRZ | Analog Devices Inc. | J-FET | 20 | 4 | 15 | 200 | 2.5 | 25 | 9 | 36 | 0 ~ 70 | 8-SOIC | Active |
| AD711KRZ-REEL7 | Analog Devices Inc. | J-FET | 20 | 4 | 15 | 200 | 2.5 | 25 | 9 | 36 | 0 ~ 70 | 8-SOIC | Active |
| AD744KRZ-REEL7 | Analog Devices Inc. | J-FET | 75 | 13 | 30 | 250 | 3.5 | 25 | 9 | 36 | 0 ~ 70 | 8-SOIC | Active |
| AD8610ARZ | Analog Devices Inc. | J-FET | 60 | 25 | 3 | 85 | 3 | 45 | 10 | 26 | -40 ~ 125 | 8-SOIC | Active |
| AD8610ARZ-REEL | Analog Devices Inc. | J-FET | 60 | 25 | 3 | 85 | 3 | 45 | 10 | 26 | -40 ~ 125 | 8-SOIC | Active |
| AD8610ARZ-REEL7 | Analog Devices Inc. | J-FET | 60 | 25 | 3 | 85 | 3 | 45 | 10 | 26 | -40 ~ 125 | 8-SOIC | Active |
Engineering Selection Recommendations
Primary Substitute: OPA637AU
The OPA637AU manufactured by Burr Brown is the direct electrical equivalent to the OPA637AUG4. This part maintains identical electrical specifications across all measured parameters: 135 V/µs slew rate, 80 MHz gain bandwidth product, 2 pA input bias current, 130 µV input offset voltage, and 45 mA output current. The OPA637AU operates within the same 9 V to 36 V supply range and is housed in the identical 8-SOIC package. Product status is Active, ensuring long-term availability. RoHS3 compliance is maintained. This substitution requires no circuit redesign or performance verification.
Secondary Substitutes: AD711 Series (AD711JRZ, AD711JRZ-REEL, AD711JRZ-REEL7, AD711KRZ, AD711KRZ-REEL7)
The AD711 series from Analog Devices Inc. operates within the same 9 V to 36 V supply range and 8-SOIC package envelope. These J-FET amplifiers are suitable for applications where reduced slew rate (20 V/µs versus 135 V/µs) and lower gain bandwidth product (4 MHz versus 80 MHz) are acceptable trade-offs. The AD711KRZ and AD711KRZ-REEL7 variants offer improved input offset voltage (200 µV) compared to the AD711JRZ variants (300 µV). All AD711 variants are Active products with RoHS3 compliance. Operating temperature range is 0°C to 70°C, which is narrower than the OPA637AUG4 specification of -25°C to 85°C.
Tertiary Substitute: AD744KRZ-REEL7
The AD744KRZ-REEL7 provides intermediate performance between the AD711 series and the OPA637AUG4, with a slew rate of 75 V/µs and gain bandwidth product of 13 MHz. This device operates within the same 9 V to 36 V supply range and 8-SOIC package. Product status is Active with RoHS3 compliance. Operating temperature range is 0°C to 70°C.
Alternative Substitute: AD8610 Series (AD8610ARZ, AD8610ARZ-REEL, AD8610ARZ-REEL7)
The AD8610 series from Analog Devices Inc. offers superior performance in slew rate (60 V/µs) and input offset voltage (85 µV) compared to the AD711 series, though below the OPA637AUG4 baseline. The AD8610 series maintains 45 mA output current matching the OPA637AUG4. However, the supply voltage range is restricted to 10 V to 26 V, which is narrower than the OPA637AUG4 specification of 9 V to 36 V. Operating temperature range extends to -40°C to 125°C. All AD8610 variants are Active products with RoHS3 compliance. This substitution is suitable only for applications operating within the 10 V to 26 V supply envelope.
Frequently Asked Questions (FAQ)
Q: Can the OPA637AU be used as a direct replacement for the OPA637AUG4 without circuit modification?
A: Yes. The OPA637AU is electrically and mechanically identical to the OPA637AUG4 across all specified parameters. No circuit redesign, component value changes, or performance verification is required. Both devices operate within the same 9 V to 36 V supply range, share identical slew rate and bandwidth specifications, and are housed in the 8-SOIC package.
Q: What are the key differences between the OPA637AUG4 and the AD711 series?
A: The primary differences are slew rate and gain bandwidth product. The OPA637AUG4 provides 135 V/µs slew rate and 80 MHz bandwidth, while the AD711 series provides 20 V/µs slew rate and 4 MHz bandwidth. The AD711 series also exhibits higher input bias current (15 pA versus 2 pA) and higher input offset voltage (200–300 µV versus 130 µV). The AD711 series is suitable for low-frequency, low-speed applications where power consumption is a priority. Operating temperature range for AD711 is 0°C to 70°C, narrower than the OPA637AUG4 range of -25°C to 85°C.
Q: Are all substitute parts RoHS3 compliant?
A: Yes. All substitute parts listed in this reference are RoHS3 compliant, matching the compliance status of the OPA637AUG4.
Q: What is the difference between AD711JRZ-REEL, AD711JRZ-REEL7, and AD711JRZ?
A: These part numbers differ in packaging format only. AD711JRZ is supplied in Tube packaging. AD711JRZ-REEL is supplied in Tape & Reel (TR) format. AD711JRZ-REEL7 is supplied in Cut Tape (CT) & Digi-Reel® format. All three variants are electrically identical and suitable for the same applications. Selection depends on procurement and assembly requirements.
Q: Can the AD8610ARZ be used in applications requiring the full 9 V to 36 V supply range of the OPA637AUG4?
A: No. The AD8610ARZ operates within a supply voltage range of 10 V to 26 V, which does not encompass the full 9 V to 36 V range of the OPA637AUG4. The AD8610ARZ is suitable only for applications operating within the 10 V to 26 V envelope. For applications requiring operation at 9 V or below, or above 26 V, the OPA637AU or AD711 series must be used.
Q: Which substitute part offers the best performance match to the OPA637AUG4?
A: The OPA637AU is the best performance match, providing identical electrical specifications. For applications where the OPA637AU is unavailable, the AD8610 series offers the closest performance profile with 60 V/µs slew rate and 25 MHz gain bandwidth product, though these values remain below the OPA637AUG4 baseline. The AD8610 series is limited to the 10 V to 26 V supply range.
Q: What is the Moisture Sensitivity Level (MSL) of the substitute parts?
A: The OPA637AU carries MSL 3 (168 Hours), identical to the OPA637AUG4. The AD711 series and AD8610 series carry MSL 1 (Unlimited), indicating superior moisture resistance and less stringent storage requirements.
Q: Are there packaging format options available for the OPA637AU?
A: The provided data specifies OPA637AU without packaging format designation. Availability of alternative packaging formats (Tube, Tape & Reel, Cut Tape & Digi-Reel) should be confirmed with the component supplier.
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