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Analog Devices Inc./Maxim Integrated OP37FP
- Part No.:
- OP37FP
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
OP37FP.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:225
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Product details
Overview
OP37FP from Analog Devices is a low-noise, precision, high-speed operational amplifier optimized for closed-loop gains >5. It delivers 17 V/µs slew rate, 63 MHz gain-bandwidth product, <25 µV input offset voltage (max), 0.6 µV/°C drift, and 3.5 nV/√Hz input voltage noise density at 10 Hz - enabling high-fidelity signal conditioning in professional audio and precision instrumentation.
For engineers reviewing the OP37FP datasheet, OP37FP pinout, OP37FP application, or OP37FP equivalent, key selection criteria include guaranteed 17 V/µs slew rate at gains ≥5, low 1/f noise corner (2.7 Hz), ±10 V output swing into 600 Ω, and compatibility with OP07/OP27 sockets - critical for legacy system upgrades and high-stability analog front-ends.
Technical Context
The OP37FP uses a zener-zap trimmed bipolar input stage to achieve sub-25 µV offset and 0.6 µV/°C drift while maintaining 17 V/µs slew rate - a deliberate trade-off versus unity-gain stable op-amps like the OP27. Its bias-current cancellation circuit holds input bias current to ±12 nA (typ) and offset current to 9 nA (max) across 0°C to +70°C.
This architecture enables stable operation at closed-loop gains ≥5 with load capacitance up to 1000 pF, and supports rail-to-rail input common-mode range (±11 V on ±15 V supplies), making it suitable for DC-coupled sensor interfaces and wide-dynamic-range audio preamplifiers where low 1/f noise and long-term drift (<0.4 µV/month) are essential.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 63 MHz - enables stable 100× amplification up to 630 kHz without phase margin loss |
| Slew Rate | 17 V/µs - supports full-scale 20 Vpp output at ≥1 MHz without distortion |
| Input Offset Voltage | ≤60 µV (max) - ensures ≤0.006% gain error in 1000× instrumentation amplifier stages |
| Input Voltage Noise Density | 3.5 nV/√Hz @ 10 Hz - dominates total noise below 15 kΩ source resistance |
| 1/f Noise Corner | 2.7 Hz - maintains ultra-low noise performance down to sub-Hz measurement bandwidths |
| Common-Mode Rejection | ≥106 dB - rejects >200,000:1 of power-supply and ground-bounce interference |
| Output Swing | ±10 V into 600 Ω - drives professional audio loads and ADC drivers without external buffers |
Pinout & Package
OP37FP is supplied in an 8-lead plastic DIP (P suffix) package with through-hole mounting and industry-standard pinout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VOS ADJ (Null) | Connects to 10 kΩ potentiometer wiper for zeroing input offset voltage; does not affect temperature drift |
| 2 | Inverting Input (–) | Differential input node; accepts signals referenced to system ground or virtual ground |
| 3 | Non-Inverting Input (+) | Differential input node; high-impedance (>1 GΩ common-mode) for sensor interfacing |
| 4 | V– | Negative supply rail; must be decoupled with ≥0.1 µF ceramic capacitor near pin |
| 5 | NC | No internal connection; left unconnected per datasheet |
| 6 | Output | Class-AB output stage capable of ±10 V swing into 600 Ω with <0.001% THD |
| 7 | V+ | Positive supply rail; requires local 0.1 µF ceramic + 10 µF tantalum decoupling |
| 8 | VOS ADJ (Null) | Second null terminal; forms balanced trim network with Pin 1 for offset adjustment |
Key Features
| Feature | Design Value |
|---|---|
| Zener-zap wafer-level trimming | Guarantees ≤60 µV offset without post-package calibration; eliminates manual nulling in production |
| Bias-current cancellation | Maintains ±12 nA input bias current (typ) despite high input-stage quiescent current for low noise |
| Low 1/f noise corner (2.7 Hz) | Enables accurate DC-coupled measurements in weigh scales and strain gauge bridges with <1 µV drift/hour |
| Stable at ACL ≥ 5 | Eliminates need for external compensation capacitors in gain-of-10 transimpedance amplifiers |
| ±10 V output into 600 Ω | Directly drives line-level audio inputs and SAR ADC reference buffers without level-shifting circuitry |
Applications
| Professional Audio Preamp | Precision Instrumentation Amplifier |
|---|---|
Use Scenario: RIAA-equalized phono preamplifier for moving-magnet cartridges requiring 40 dB gain and <0.01% THD. IC Role / Device Role / Timing Role: Primary gain block with frequency-dependent feedback; handles DC-coupled input and 20 kHz bandwidth. Use Value: 3.5 nV/√Hz noise density and 2.7 Hz 1/f corner enable vinyl playback SNR >95 dB(A) without capacitor-coupled staging. | Use Scenario: Three-op-amp instrumentation amplifier for medical ECG front-end with 1000× gain and 800 kHz bandwidth. IC Role / Device Role / Timing Role: Input-stage differential amplifier; provides matched gain, CMRR >120 dB, and low input current for electrode biasing. Use Value: 9 nA max input offset current prevents electrode polarization errors; 63 MHz GBW supports 800 kHz full-power bandwidth at 1000× gain. |
| Strain Gauge Signal Conditioning | Tape Head Playback Amplifier |
Use Scenario: Wheatstone bridge amplifier for load cell with 2 mV/V sensitivity and 10 Hz–1 kHz bandwidth. IC Role / Device Role / Timing Role: Low-drift, low-noise first-stage amplifier; operates in DC-coupled configuration with 0.6 µV/°C drift compensation. Use Value: 0.6 µV/°C drift ensures <1 LSB error over 50°C ambient shift in 24-bit sigma-delta ADC systems. | Use Scenario: High-fidelity tape playback head amplifier requiring 60 dB gain, 20 kHz bandwidth, and direct coupling to avoid capacitor-induced phase shift. IC Role / Device Role / Timing Role: Low-bias-current, low-noise voltage amplifier; interfaces directly to high-impedance tape head (≤1.5 kΩ). Use Value: ±12 nA input bias current prevents self-magnetization of tape heads; 17 V/µs slew rate preserves transient response of drum transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OP27GP | Unity-gain stable; lower slew rate (8 V/µs); higher 1/f corner (10 Hz); 25 µV offset (max) | Better for gains <5 and wideband AC-coupled circuits; unsuitable for DC-coupled high-gain stages | Select OP27GP only when unity-gain stability or lower power (80 mW) is required; OP37FP preferred for gains ≥5 with superior noise and speed |
| OP07EP | Lower noise corner (0.6 Hz); higher drift (1.2 µV/°C); slower slew (0.3 V/µs); 75 µV offset (max) | Optimized for ultra-low-drift DC applications (e.g., thermocouple amps); cannot support >10 kHz bandwidth | Choose OP07EP for sub-1 Hz measurement systems where drift dominates; OP37FP for bandwidth/noise-critical designs above 100 Hz |
Compared with OP27GP and OP07EP, the OP37FP uniquely balances 17 V/µs slew rate, 2.7 Hz 1/f corner, and 60 µV offset guarantee - making it the optimal choice for precision audio and instrumentation where both speed and low-frequency noise must coexist.
Availability
OP37FP is available at Aetrix Electronics and suitable for professional audio preamplifiers, precision instrumentation amplifiers, strain gauge signal conditioners, and tape head playback circuits requiring stable component supply across industrial temperature ranges.
Supply support for OP37FP includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision measurement, industrial automation, and communications markets.
The OP37FP belongs to Analog Devices' legacy precision op-amp product line, engineered specifically for high-speed, low-noise, DC-coupled signal conditioning in test equipment, medical instruments, and professional audio - where long-term stability and 1/f noise performance are non-negotiable.
FAQ
What is the maximum closed-loop gain supported by the OP37FP without compensation?
The OP37FP is internally compensated for stable operation at closed-loop gains ≥5. Using it at gains below 5 (e.g., unity or gain-of-2) risks oscillation due to reduced phase margin. For lower gains, the OP27GP is the recommended alternative. The OP37FP's 63 MHz gain-bandwidth product allows stable 100× amplification up to 630 kHz - a key advantage over general-purpose op-amps in precision wideband applications.
Can the OP37FP replace an OP07 in an existing socket without circuit modification?
Yes, the OP37FP is pin-compatible with the OP07 and can be inserted directly into standard 8-pin DIP sockets. However, external nulling components may need removal or adjustment since the OP37FP's wafer-trimmed offset is typically lower than the OP07's, and its internal compensation differs. Verify loop stability and DC operating points after substitution, especially in high-gain DC-coupled configurations where the OP37FP's faster response may reveal layout parasitics.
What is the guaranteed input offset voltage specification for OP37FP over temperature?
The OP37FP guarantees ≤60 µV input offset voltage at room temperature (25°C), with a maximum drift of 0.6 µV/°C over its full operating range (0°C to +70°C). Long-term stability is rated at ≤0.4 µV/month, making it suitable for systems requiring recalibration intervals exceeding one year. This performance is achieved via zener-zap trimming at wafer probe - a process that ensures consistency across production lots without post-package adjustment.
Does the OP37FP support dual-supply operation, and what are the absolute maximum ratings?
Yes, the OP37FP is designed for dual-supply operation with ±4.5 V to ±18 V total supply range (i.e., 9 V to 36 V). Absolute maximum ratings specify ±22 V supply voltage and ±0.7 V differential input voltage. Exceeding ±0.7 V differential input requires external current limiting, as the inputs lack series resistors to preserve low-noise performance. Junction temperature must remain within –45°C to +150°C, with thermal resistance θJA = 103°C/W for the plastic DIP package.
How does the OP37FP's noise performance compare to the OP27GP at 1 kHz and 10 Hz?
At 1 kHz, the OP37FP specifies 3.0 nV/√Hz input voltage noise density (typ), matching the OP27GP's 3.0 nV/√Hz. At 10 Hz, the OP37FP's 3.5 nV/√Hz is significantly lower than the OP27GP's 10 nV/√Hz due to its 2.7 Hz 1/f corner versus the OP27GP's 10 Hz corner. This makes the OP37FP superior for low-frequency precision applications like DC-coupled sensor amplifiers, while both perform identically in mid-bandwidth AC-coupled circuits.
OP37FP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Bulk
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 17V/µs
- Gain Bandwidth Product:
- 63 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 12 nA
- Voltage - Input Offset:
- 20 µV
- Current - Supply:
- -
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 8 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
OP37FP FAQ
1.How can I place an order for OP37FP through Aetrix?
Please submit a Request for Quotation (RFQ) for OP37FP on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for OP37FP reliable?
The price and inventory of OP37FP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OP37FP is usually 5 days.
3.What payment methods are accepted for OP37FP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OP37FP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OP37FP?
OP37FP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OP37FP order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for OP37FP?
For technical support, including OP37FP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OP37FP requirements.
6.How does Aetrix verify that OP37FP is sourced from the original manufacturer or authorized distributors?
All OP37FP products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that OP37FP meets industry standards.
7.What is the process for return or replacement of OP37FP?
All OP37FP units undergo pre-shipment inspection (PSI). If there is an issue with OP37FP, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The OP37FP part is unused and in its original packaging.
Return procedure for OP37FP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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