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Analog Devices Inc. OP37AH
- Part No.:
- OP37AH
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- TO-205-8, TO-5-8 Metal Can
- Datasheet:
-
OP37AH.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT TO5
- Quantity:
- Payment:
- Shipping:
Inventory:3,578
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Product details
Overview
OP37AH 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, making it suitable for microphone preamplifiers, RIAA phono stages, and high-gain data acquisition signal conditioning.
For engineers reviewing the OP37AH datasheet, OP37AH pinout, OP37AH application, or OP37AH equivalent, key selection criteria include its guaranteed military-temperature operation (–55°C to +125°C), wafer-trimmed offset voltage ≤25 μV (typ), low 1/f noise corner at 2.7 Hz, and compatibility with 725/OP07 sockets without layout change.
Technical Context
The OP37AH uses a decompensated architecture requiring minimum closed-loop gain of 5 for stability, enabling higher slew rate and bandwidth than unity-gain-stable counterparts like the OP27. Its input stage employs bias-current cancellation to achieve ±10 nA input bias current and 7 nA offset current while maintaining ultra-low voltage noise.
On-chip zener-zap trimming ensures long-term offset stability (0.2 μV/month) and low drift (0.2 μV/°C typ), with offset adjustable via external 10 kΩ potentiometer without degrading temperature coefficient. The output stage drives ±10 V into 600 Ω with low distortion, supporting professional audio linearity requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Noise Density | 3.0 nV/√Hz @ 1 kHz - enables high-fidelity amplification of microvolt-level sensor signals without dominating source resistor noise below 1 kΩ |
| Slew Rate | 17 V/μs - supports fast transient response in wideband instrumentation and audio applications up to 250 kHz full-power bandwidth |
| Gain Bandwidth Product | 63 MHz - allows stable operation at gain ≥5 with usable bandwidth exceeding 12 MHz at G = 5 |
| Input Offset Voltage (Max) | 25 μV - ensures <0.0025% gain error in 100× precision gain stages without nulling |
| CMRR | 126 dB @ ±11 V common-mode - rejects >99.9997% of power-supply-coupled interference in single-supply-derived rails |
| Operating Temperature Range | –55°C to +125°C - qualified for aerospace, defense, and downhole industrial environments without derating |
| Long-Term Drift | 0.2 μV/month - eliminates need for periodic recalibration in metrology-grade measurement systems |
Pinout & Package
OP37AH is supplied in an 8-lead hermetic ceramic DIP (Z suffix) package with metal lid and glass-sealed leads, rated for MIL-STD-883 Class B reliability and humidity resistance.
| 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 coefficient when RP = 10 kΩ |
| 2 | Inverting Input (–) | Differential input node; input bias current ≤±40 nA allows use with high-impedance sources up to 10 MΩ without significant DC error |
| 3 | Non-Inverting Input (+) | Differential input node; common-mode input range extends to ±11 V on ±15 V supplies |
| 4 | V– | Negative supply rail connection; must be decoupled with ≥0.1 μF ceramic capacitor near pin for stability |
| 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 THD <0.01% at 3 VRMS |
| 7 | V+ | Positive supply rail connection; PSRR >120 dB minimizes supply ripple coupling into signal path |
| 8 | VOS ADJ (Null) | Second terminal of offset trim network; forms balanced potentiometer configuration with Pin 1 |
Key Features
| Feature | Design Value |
|---|---|
| Low 1/f noise corner | 2.7 Hz - preserves signal integrity in DC-coupled precision instrumentation where sub-10 Hz bandwidth is critical |
| Offset voltage trim capability | ±4 mV adjustment range with 10 kΩ pot - enables system-level calibration without modifying PCB layout |
| Stable with capacitive loads | Up to 1000 pF without external isolation resistor - simplifies driving ADC input filters or coaxial cables |
| Input bias current cancellation | ±10 nA max @ 25°C - reduces voltage error across 1 MΩ source resistors to <10 μV, enabling direct-coupled transducer interfaces |
| Military-grade qualification | OP37AH meets MIL-PRF-38535 Class K screening - includes burn-in, temperature cycling, and hermeticity testing |
Applications
| Microphone Preamplifier | RIAA Phono Equalization |
|---|---|
Use Scenario: Amplifying low-level (<10 mV) condenser microphone outputs in studio recording interfaces with DC-coupled topology. IC Role / Device Role / Timing Role: Primary gain block in first-stage preamp with 60 dB fixed gain and 20 Hz–20 kHz bandwidth. Use Value: 3.0 nV/√Hz noise density ensures >80 dB SNR referenced to 1 mV input, outperforming legacy OP07 by 12 dB in same 1 kHz bandwidth. |
Use Scenario: Implementing IEC 60098 RIAA equalization curve in vinyl playback systems with passive feedback network. IC Role / Device Role / Timing Role: High-precision, decompensated op amp providing 40 dB gain at 1 kHz with <0.1 dB equalization error across 20 Hz–20 kHz. Use Value: 63 MHz GBW enables accurate time-constant synthesis (3180 μs, 318 μs, 75 μs) without phase-induced peaking, unlike unity-gain-stable alternatives. |
| Tape Head Playback | High-Gain Data Acquisition |
Use Scenario: Recovering analog audio signals from NAB-standard magnetic tape heads with heavy low-frequency boost and 3 kHz high-frequency shelf. IC Role / Device Role / Timing Role: First-stage transimpedance amplifier converting head current to voltage with 30 dB gain and tailored frequency shaping. Use Value: 17 V/μs slew rate prevents slew-induced distortion on 10 VP-P transients, critical for preserving tape saturation harmonics in mastering applications. |
Use Scenario: Amplifying thermocouple or strain gauge outputs in automated test equipment requiring 1000× gain and 16-bit resolution. IC Role / Device Role / Timing Role: Precision gain stage preceding 16-bit SAR ADC, operating at G = 100 with 126 dB CMRR rejecting shared ground noise. Use Value: 0.2 μV/°C drift contributes <0.005% error over 50°C ambient shift, eliminating need for per-channel cold-junction compensation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OP27GH | Unity-gain stable; lower slew rate (8 V/μs); higher 1/f corner (10 Hz); 25 μV VOS max | Preferred for G = 1–4 circuits; unsuitable for >5 MHz closed-loop bandwidth | Select OP27GH only when gain <5 or unity-gain buffering is required; OP37AH provides 2.1× higher bandwidth at G = 5 |
| OP07DP | Lower noise (0.6 μV p-p, 0.1–10 Hz); slower slew (0.3 V/μs); wider common-mode range (±13 V); 30 μV VOS max | Better for ultra-low-frequency DC measurements; cannot support audio or fast transient signals | Choose OP07DP for sub-1 Hz applications like pH meters; OP37AH is superior for any signal above 10 Hz requiring speed and low noise |
Compared with OP27GH and OP07DP, the OP37AH uniquely balances ultra-low voltage noise, high slew rate, and military-temperature operation-enabling single-part solutions in high-fidelity audio, ruggedized DAQ, and aerospace signal chains where competing parts force trade-offs between speed, noise, or reliability.
Availability
OP37AH is available at Aetrix Electronics and suitable for microphone preamplifiers, RIAA phono stages, and high-gain data acquisition systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for OP37AH 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, communications, and industrial markets since 1965.
The OP37AH belongs to Analog Devices' precision op amp product line, engineered specifically for high-speed, low-noise applications demanding military-grade reliability and minimal drift in gain ≥5 configurations.
FAQ
What is the minimum stable closed-loop gain for OP37AH?
The OP37AH is decompensated and requires a minimum closed-loop gain of 5 for stability. Attempting unity-gain or G = 2 configurations will cause oscillation due to insufficient phase margin. This design enables its 17 V/μs slew rate and 63 MHz GBW-performance unattainable in unity-gain-stable op amps like the OP27GH. Always verify stability with load capacitance and feedback network parasitics in final layout.
Does OP37AH support offset nulling, and how does it affect drift?
Yes, OP37AH supports offset nulling via Pins 1 and 8 using a 10 kΩ potentiometer, providing ±4 mV adjustment range. Critically, trimming with RP = 10 kΩ does not degrade the temperature coefficient-TCVOS remains 0.2 μV/°C typical. Using smaller pot values (e.g., 1 kΩ) introduces up to 0.2 μV/°C additional drift; larger values (>100 kΩ) reduce adjustment sensitivity but maintain TCVOS integrity. The OP37AH datasheet confirms this behavior in Figure 1 and Applications section.
What is the maximum capacitive load OP37AH can drive without instability?
The OP37AH is characterized to remain stable with capacitive loads up to 1000 pF while delivering ±10 V output swing. For loads exceeding 1000 pF-such as long coaxial cables or ADC input filters-insert a 50 Ω isolation resistor inside the feedback loop, as specified in the Applications Information section. This maintains phase margin without requiring external compensation networks. Stability is verified per TPC 22 (Overshoot vs. Capacitive Load) in the OP37AH datasheet.
How does OP37AH's noise performance compare to OP07 in low-frequency applications?
Below 3 kHz, OP37AH's 3.0 nV/√Hz voltage noise dominates total noise when source resistance <1 kΩ, outperforming OP07 by >10 dB. However, above 3 kΩ source impedance, OP07's lower current noise (0.6 pA/√Hz vs. 0.4 pA/√Hz) makes it superior for very high-Z sensors like piezoelectric accelerometers. The OP37AH datasheet explicitly states this crossover occurs at ~3–5 kΩ for 0.1–10 Hz p-p noise (TPC 6, Figure 6). Select OP37AH for low-Z audio and DAQ; OP07 for ultra-high-Z DC sensors.
Is OP37AH pin-compatible with legacy OP07 or 725 sockets?
Yes, OP37AH uses the standard 8-pin DIP footprint and pinout of the OP07 and LM725, allowing direct socket replacement without PCB modification. However, external nulling components used with OP07 must be removed or reconfigured, as OP37AH's internal trimming and different bias structure render legacy networks ineffective. The OP37AH datasheet confirms socket compatibility in the Applications Information section and Figure 1.
OP37AH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- TO-205-8, TO-5-8 Metal Can
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 17V/µs
- Gain Bandwidth Product:
- 63 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 10 nA
- Voltage - Input Offset:
- 10 µV
- Current - Supply:
- -
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 8 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- -55°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-5
OP37AH FAQ
1.How can I place an order for OP37AH through Aetrix?
Please submit a Request for Quotation (RFQ) for OP37AH 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 OP37AH reliable?
The price and inventory of OP37AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OP37AH is usually 5 days.
3.What payment methods are accepted for OP37AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OP37AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OP37AH?
OP37AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OP37AH 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 OP37AH?
For technical support, including OP37AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OP37AH requirements.
6.How does Aetrix verify that OP37AH is sourced from the original manufacturer or authorized distributors?
All OP37AH 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 OP37AH meets industry standards.
7.What is the process for return or replacement of OP37AH?
All OP37AH units undergo pre-shipment inspection (PSI). If there is an issue with OP37AH, 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 OP37AH part is unused and in its original packaging.
Return procedure for OP37AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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