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Analog Devices Inc. OP37GN8#PBF
- Part No.:
- OP37GN8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
OP37GN8#PBF.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,179
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Product details
Overview
OP37GN8#PBF from Analog Devices is a low-noise, precision, high-speed operational amplifier optimized for closed-loop gains >5, featuring 3.0 nV/√Hz input voltage noise density at 1 kHz, 17 V/µs slew rate, and 63 MHz gain-bandwidth product. It delivers 126 dB CMRR and 1.8 million open-loop gain in an 8-lead plastic DIP package, widely used in microphone preamplifiers, RIAA phono stages, and high-resolution data acquisition signal conditioning.
For engineers reviewing the OP37GN8#PBF datasheet, OP37GN8#PBF pinout, OP37GN8#PBF application, or OP37GN8#PBF equivalent, key selection criteria include guaranteed 17 V/µs slew rate at AVCL ≥ 5, ±4 mV offset trim range via external potentiometer, low 0.2 µV/°C typical input offset drift, and compatibility with 725/OP07 sockets without layout changes.
Technical Context
The OP37GN8#PBF employs a decompensated internal architecture requiring minimum closed-loop gain of 5 for stability, distinguishing it from unity-gain-stable op amps like the OP27. Its input stage uses bias-current cancellation to achieve 10 nA max input bias current while maintaining ultra-low voltage noise.
Offset voltage is trimmed at wafer level using zener-zap technology, enabling long-term stability of 0.2 mV/month and TCVOS as low as 0.2 µV/°C (typ). The output stage drives ±10 V into 600 Ω with low distortion, supporting professional audio line-driving applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Noise Density | 3.0 nV/√Hz @ 1 kHz - enables high-fidelity amplification of µV-level sensor signals without dominant amplifier noise contribution |
| Slew Rate | 17 V/µs - supports clean 20 VPP output swing up to ~250 kHz full-power bandwidth |
| Gain-Bandwidth Product | 63 MHz - allows stable 1000× gain with >63 kHz closed-loop bandwidth when AVCL ≥ 5 |
| Input Offset Voltage (Max) | 100 µV - ensures <0.01% gain error in 10 V full-scale instrumentation front-ends |
| CMRR | 126 dB @ ±11 V common-mode - rejects >99.9997% of power-supply-coupled interference in single-supply sensor interfaces |
| Supply Voltage Range | ±4 V to ±18 V - accommodates industrial ±15 V rails and extended-range test equipment |
| Operating Temperature | –40°C to +85°C - qualified for automotive cabin and industrial control environments |
Pinout & Package
OP37GN8#PBF is housed in an 8-lead plastic DIP (Dual In-line Package) with 0.3-inch body width and through-hole mounting. Pin 1 is marked by a notch or dot; pins are numbered counterclockwise from top-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VOS ADJ (Null) | Connects to wiper of 10 kΩ potentiometer for zeroing input offset voltage; does not affect temperature drift when trimmed per spec |
| 2 | Inverting Input (–) | Differential input node; high-impedance (1.3 MΩ min) with 7 nA max input offset current |
| 3 | Non-Inverting Input (+) | Differential input node; matched to Pin 2 for optimal CMRR and PSRR performance |
| 4 | V– | Negative supply rail connection; must be decoupled with ≥0.1 µF ceramic capacitor near pin |
| 5 | NC | No internal connection; left unconnected per datasheet; no routing or grounding required |
| 6 | Output | Class-A/B output stage capable of ±10 V swing into 600 Ω with <0.01% THD |
| 7 | V+ | Positive supply rail connection; requires local 0.1 µF ceramic decoupling capacitor |
| 8 | VOS ADJ (Null) | Second terminal of offset null network; completes trim circuit with Pin 1 and external potentiometer |
Key Features
| Feature | Design Value |
|---|---|
| Low 1/f noise corner | 2.7 Hz - preserves signal integrity in DC-coupled instrumentation where sub-10 Hz bandwidth is critical |
| Zener-zap offset trimming | Stable wafer-level calibration with <0.2 µV/°C drift - eliminates need for post-mounting recalibration in field-deployed systems |
| Bias-current cancellation | 10 nA max IB at 25°C - enables accurate amplification of high-impedance sources (e.g., piezoelectric sensors, tape heads) without added offset error |
| Guaranteed slew rate | 17 V/µs over full temperature range - ensures consistent transient response in multi-stage active filters and pulse amplifiers |
| High open-loop gain | 1.8 million (min) - maintains <0.001% gain error in 100× closed-loop configurations even under load |
Applications
| Microphone Preamp | RIAA Phono Equalization |
|---|---|
Use Scenario: Low-noise amplification of electret condenser microphone outputs (typically 10 mV RMS, 2–20 kHz). IC Role / Device Role / Timing Role: First-stage gain block with direct coupling, providing 40 dB fixed gain and 3.0 nV/√Hz noise floor. Use Value: Achieves >70 dB SNR referenced to 1 Pa with 100 Ω source impedance, meeting IEC 61094 Class 1 microphone calibration requirements. | Use Scenario: Accurate inverse RIAA equalization for vinyl record playback, compensating for 3180/318/75 µs time constants. IC Role / Device Role / Timing Role: High-precision gain block implementing frequency-dependent feedback network with <0.1 dB equalization error. Use Value: Delivers 39.9 dB gain at 1 kHz and <0.01% THD up to 7 VRMS, preserving analog warmth while eliminating low-frequency rumble. |
| Tape Head Signal Conditioning | High-Resolution Data Acquisition |
Use Scenario: Amplifying low-level signals from magnetic tape playback heads (100–500 mV, 50 Hz–20 kHz). IC Role / Device Role / Timing Role: Wideband, low-distortion gain stage with NAB equalization network and ±10 V output swing capability. Use Value: Supports 20 VPP output into 600 Ω with 250 kHz full-power bandwidth, enabling direct interface to ADC drivers without additional buffering. | Use Scenario: Front-end amplification for 16-bit+ SAR ADCs in precision test equipment, requiring sub-µV offset and low 1/f noise. IC Role / Device Role / Timing Role: Programmable-gain instrumentation amplifier input stage with 0.2 µV/°C drift and 80 nVP-P (0.1–10 Hz) noise. Use Value: Enables 16-bit effective resolution over –40°C to +85°C without auto-zero or chopper correction, reducing system BOM cost. |
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); 2.9 nV/√Hz @ 1 kHz | Preferred for AVCL = 1–4 circuits; less suitable for >100 kHz closed-loop bandwidths | Select OP27GP only when unity-gain stability is mandatory and bandwidth <100 kHz suffices |
| OPA211IDR | Zero-drift architecture; 1.1 nV/√Hz @ 1 kHz; 1.1 µV offset; but 45 MHz GBW and 27 V/µs slew rate | Superior DC accuracy and low-frequency noise; requires external compensation for AVCL < 10 | Choose OPA211IDR for ultra-low drift (<0.01 µV/°C) and sub-µV offset; accept higher cost and design complexity |
Compared with OP27GP and OPA211IDR, OP37GN8#PBF uniquely balances high slew rate (17 V/µs), low 1/f noise corner (2.7 Hz), and proven socket compatibility with legacy 725/OP07 designs-making it optimal for retrofits and high-fidelity audio signal chains where gain ≥5 is acceptable.
Availability
OP37GN8#PBF is available at Aetrix Electronics and suitable for microphone preamplifiers, RIAA phono stages, tape head signal conditioners, and high-resolution data acquisition systems requiring stable component supply across industrial temperature ranges.
Supply support for OP37GN8#PBF 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 instrumentation, industrial automation, and audio markets since 1965.
The OP37GN8#PBF belongs to Analog Devices' precision op amp product line, engineered specifically for high-speed, low-noise applications demanding both wide bandwidth and sub-microvolt offset stability in gain-of-five-or-higher configurations.
FAQ
What is the minimum stable closed-loop gain for OP37GN8#PBF?
The OP37GN8#PBF is decompensated and requires a minimum closed-loop gain of 5 for stability. Attempting unity-gain or gain-of-2 configurations may cause oscillation or excessive peaking. This is confirmed in the General Description section and Applications Information, which explicitly states "Closed loop gain must be at least five." Designers must ensure feedback networks maintain AVCL ≥ 5 across all operating conditions.
Can OP37GN8#PBF replace OP07 in existing sockets?
Yes, OP37GN8#PBF can be inserted directly into OP07 sockets without PCB modification. As stated in Applications Information, "OP37 Series units may be inserted directly into 725 and OP07 sockets with or without removal of external compensation or nulling components." However, if conventional 741-type nulling circuitry exists, it should be removed or modified to avoid interaction with OP37GN8#PBF's internal trimming structure.
What is the maximum capacitive load the OP37GN8#PBF can drive stably?
The OP37GN8#PBF provides stable operation with load capacitances up to 1000 pF while delivering ±10 V output swings, as documented in Applications Information. For larger capacitances, a 50 Ω series resistor inside the feedback loop is recommended to isolate the capacitive load and preserve phase margin. This behavior is verified in Typical Performance Characteristics (TPC 22).
Does OP37GN8#PBF support offset nulling, and what is the adjustment range?
Yes, OP37GN8#PBF supports external offset nulling via Pins 1 and 8 using a 10 kΩ potentiometer, providing a ±4 mV adjustment range. The datasheet confirms this in the Offset Voltage Adjustment section and specifies that TCVOS is not degraded when trimmed per recommended configuration. Smaller pot values (1 kΩ–1 MΩ) are usable but may slightly increase drift.
What is the input voltage noise specification of OP37GN8#PBF at 10 Hz?
The OP37GN8#PBF has an input voltage noise density of 3.5 nV/√Hz at 10 Hz, as specified in the "SPECIFICATIONS" table on page 3 under "Input Noise Voltage Density" with fO = 10 Hz. This value is consistent across OP37G-grade devices and is critical for low-frequency precision applications such as strain gauge amplification and DC-coupled sensor interfaces.
OP37GN8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- 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:
- 15 nA
- Voltage - Input Offset:
- 30 µV
- Current - Supply:
- -
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 8 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- -25°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
OP37GN8#PBF FAQ
1.How can I place an order for OP37GN8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for OP37GN8#PBF 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 OP37GN8#PBF reliable?
The price and inventory of OP37GN8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OP37GN8#PBF is usually 5 days.
3.What payment methods are accepted for OP37GN8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OP37GN8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OP37GN8#PBF?
OP37GN8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OP37GN8#PBF 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 OP37GN8#PBF?
For technical support, including OP37GN8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OP37GN8#PBF requirements.
6.How does Aetrix verify that OP37GN8#PBF is sourced from the original manufacturer or authorized distributors?
All OP37GN8#PBF 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 OP37GN8#PBF meets industry standards.
7.What is the process for return or replacement of OP37GN8#PBF?
All OP37GN8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with OP37GN8#PBF, 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 OP37GN8#PBF part is unused and in its original packaging.
Return procedure for OP37GN8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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