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Analog Devices Inc./Maxim Integrated OP37EP
- Part No.:
- OP37EP
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
OP37EP.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,677
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Product details
Overview
OP37EP 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, and input offset voltage ≤60 µV over 0°C to +70°C. Its 3.5 nV/√Hz voltage noise density at 10 Hz and 0.6 µV/°C max drift support high-gain signal conditioning in instrumentation-grade audio and data acquisition systems.
For engineers reviewing the OP37EP datasheet, OP37EP pinout, OP37EP application, or OP37EP equivalent, key selection criteria include guaranteed performance across 0°C to +70°C, ±15 V supply operation, 8-pin plastic DIP (P) package compatibility, and verified replacement capability for OP07/OP27 in gain-stable configurations.
Technical Context
The OP37EP uses a zener-zap trimmed bipolar input stage with bias-current cancellation to achieve low input bias current (±14 nA typ) while maintaining precision offset (≤60 µV) and ultra-low 1/f noise corner (2.7 Hz). Its internal compensation ensures stability at closed-loop gains ≥5 without external components.
Designed specifically for high-gain analog signal paths, the OP37EP features rail-to-rail output swing (±10 V into 600 Ω), 126 dB CMRR at ±11 V common-mode voltage, and PSRR >120 dB - enabling accurate DC-coupled amplification of microvolt-level sensor outputs in noisy industrial environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | ±4.5 V to ±18 V - supports dual-rail operation in legacy ±15 V systems and modern lower-voltage precision rails. |
| Slew Rate | 17 V/µs - enables faithful reproduction of fast transients in audio preamplifiers and data acquisition front-ends. |
| Gain-Bandwidth Product | 63 MHz - sustains stable high closed-loop gain (e.g., ×100) up to 630 kHz, critical for wideband instrumentation. |
| Input Offset Voltage | ≤60 µV (max) at TA = 25°C - ensures minimal DC error in strain gauge or thermocouple amplifiers. |
| Voltage Noise Density | 3.5 nV/√Hz @ 10 Hz - provides superior resolution for low-frequency sensor signals below 100 Hz. |
| Input Offset Drift | ≤0.6 µV/°C (max) - guarantees long-term calibration stability in unregulated ambient environments. |
| Common-Mode Rejection | ≥106 dB - rejects interference from shared ground paths in multi-channel measurement systems. |
Pinout & Package
OP37EP 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 (non-inverting) | Connects to one end of 10 kΩ trim potentiometer for offset nulling; does not affect temperature drift when used per spec. |
| 2 | Inverting Input (–) | Differential input node; high-impedance (1.3 MΩ min) with low bias current (±14 nA typ) for minimal source loading. |
| 3 | Non-Inverting Input (+) | Differential input node; matched to Pin 2 for optimal CMRR and offset rejection in balanced configurations. |
| 4 | V– | Negative supply rail connection; must be decoupled locally to suppress power rail noise coupling into sensitive inputs. |
| 5 | VOS ADJ (inverting) | Connects to other end of 10 kΩ trim potentiometer; forms adjustable voltage divider for precise VOS correction. |
| 6 | Output | Capable of ±10 V swing into 600 Ω load; exhibits <1% overshoot with ≤1000 pF capacitive loads without isolation resistor. |
| 7 | V+ | Positive supply rail connection; requires local 0.1 µF ceramic + 10 µF tantalum decoupling for broadband noise suppression. |
| 8 | No Connect | Internally unused; must remain floating - no tie to ground or supply to avoid parasitic coupling or latch-up risk. |
Key Features
| Feature | Design Value |
|---|---|
| Low 1/f noise corner | 2.7 Hz - enables accurate DC-to-10 Hz measurements in seismic sensors and precision weigh scales without high-pass filtering. |
| Zener-zap offset trimming | Wafer-level permanent adjustment - eliminates need for external nulling in production systems, reducing BOM count and assembly cost. |
| Bias-current cancellation | ±14 nA input bias current (typ) at 25°C - minimizes voltage error across high-impedance sources like piezoelectric accelerometers. |
| Stable at AVCL ≥ 5 | No external compensation required - simplifies layout and improves phase margin in gain-of-10 transimpedance amplifiers for photodiode interfaces. |
| High open-loop gain | 1.8 million (min) - ensures <0.001% gain error in ×1000 instrumentation amplifier topologies using three OP37EPs. |
Applications
| Microphone Pre-Amplifier | Strain Gauge Signal Conditioning |
|---|---|
Use Scenario: Amplifying low-level (<10 mV), high-impedance microphone outputs in studio-grade audio interfaces with RIAA equalization. IC Role / Device Role / Timing Role: Primary gain block in first-stage preamp; configured as non-inverting amplifier with gain ≥10 to leverage inherent stability and low noise. Use Value: 3.5 nV/√Hz input noise and 0.6 µV/°C drift preserve dynamic range and thermal stability across recording sessions without recalibration. | Use Scenario: Converting millivolt-level Wheatstone bridge outputs from metal foil strain gauges in load cells and pressure transducers. IC Role / Device Role / Timing Role: Instrumentation amplifier input stage; operated at gain ≥25 to maximize SNR while rejecting common-mode bridge excitation noise. Use Value: 126 dB CMRR and 60 µV max VOS ensure sub-0.01% linearity error over temperature in industrial weighing systems. |
| Tape Head Playback Amplifier | Data Acquisition Front-End |
Use Scenario: Recovering analog audio signals from magnetic tape heads with impedance <1.5 kΩ and bandwidth up to 20 kHz. IC Role / Device Role / Timing Role: Low-noise voltage amplifier in playback chain; direct-coupled to eliminate capacitor-induced phase shift and distortion. Use Value: Ultra-low IB (±14 nA) prevents self-magnetization of tape heads, while 17 V/µs slew rate preserves transient fidelity in high-frequency content. | Use Scenario: Digitizing sensor outputs (thermocouples, RTDs) in 16-bit+ data loggers requiring 100 dB SNR and DC accuracy. IC Role / Device Role / Timing Role: Precision buffer and programmable-gain stage preceding SAR ADC; operated at AVCL = 5–100 with calibrated offset nulling. Use Value: 63 MHz GBW supports anti-aliasing filter design with sharp roll-off, and 0.2 µV/month long-term drift ensures annual calibration intervals. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OP27GP | Unity-gain stable; lower slew rate (8 V/µs); higher input noise (4.5 nV/√Hz @ 10 Hz); wider temp range (–40°C to +85°C). | Preferred for AVCL = 1–4 circuits; unsuitable for AVCL ≥ 5 where OP37EP's speed/noise advantage dominates. | Select OP27GP only when unity-gain stability is mandatory and bandwidth requirements are <30 MHz. |
| OP07EP | Lower input offset (25 µV max); slower slew rate (0.3 V/µs); narrower GBW (0.6 MHz); no internal trim - requires external nulling. | Better for pure DC precision (e.g., digital multimeters); cannot replace OP37EP in audio or wideband applications due to bandwidth limitation. | Choose OP07EP when long-term DC stability outweighs speed; avoid where signal bandwidth exceeds 10 kHz. |
Compared with OP27GP and OP07EP, the OP37EP uniquely balances high speed (17 V/µs), low noise (3.5 nV/√Hz), and guaranteed stability at AVCL ≥ 5 - making it the optimal choice for gain-stable, wideband precision amplification where both fidelity and accuracy are critical.
Availability
OP37EP is available at Aetrix Electronics and suitable for precision instrumentation, professional audio pre-amplification, and industrial sensor signal conditioning requiring stable component supply across extended production lifecycles.
Supply support for OP37EP 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 industrial, automotive, communications, and healthcare markets.
The OP37EP belongs to the OP37 series of precision op amps designed specifically for high-gain (>5), low-noise, DC-coupled analog signal chains in test equipment, audio systems, and data acquisition front-ends.
FAQ
What is the operating temperature range specified for the OP37EP?
The OP37EP is rated for operation from 0°C to +70°C, as confirmed in the official Analog Devices datasheet and Rochester Electronics ordering guide. This commercial-industrial grade temperature range distinguishes it from the OP37EZ (–25°C to +85°C) and military-grade OP37AZ (–55°C to +125°C), and directly impacts its maximum input offset drift specification of 0.6 µV/°C.
Can the OP37EP replace an OP07 in an existing circuit without modifications?
Yes, the OP37EP can directly replace an OP07 in most socketed designs, as both use identical 8-pin DIP footprints and share compatible pin functions. However, because the OP37EP is optimized for closed-loop gains ≥5 and is not unity-gain stable, circuits originally designed for AVCL = 1 must be re-evaluated for stability - especially if external compensation or nulling networks remain in place.
What is the maximum capacitive load the OP37EP can drive without instability?
The OP37EP maintains stable operation with capacitive loads up to 1000 pF while delivering ±10 V output swings, per the manufacturer's application note. For loads exceeding 1000 pF, a 50 Ω isolation resistor must be added inside the feedback loop to prevent peaking or oscillation - a requirement explicitly documented in the OP37EP datasheet's Applications Information section.
Does the OP37EP require external offset nulling in production systems?
No, the OP37EP features on-chip zener-zap trimming performed at wafer test, guaranteeing input offset voltage ≤60 µV without external components. While Pins 1 and 5 support optional 10 kΩ potentiometer adjustment for fine nulling, this is unnecessary for most applications and does not degrade the specified 0.6 µV/°C drift performance when implemented per datasheet guidance.
How does the OP37EP's noise performance compare to the OP27GP at 10 Hz?
At 10 Hz, the OP37EP specifies 3.5 nV/√Hz input voltage noise density, while the OP27GP specifies 4.5 nV/√Hz under identical conditions. This 1.0 nV/√Hz advantage makes the OP37EP measurably quieter in low-frequency applications such as seismic sensing and precision DC amplification - a difference confirmed in the "Typical Electrical Characteristics" table of the OP37EP datasheet.
OP37EP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- 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:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
OP37EP FAQ
1.How can I place an order for OP37EP through Aetrix?
Please submit a Request for Quotation (RFQ) for OP37EP 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 OP37EP reliable?
The price and inventory of OP37EP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OP37EP is usually 5 days.
3.What payment methods are accepted for OP37EP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OP37EP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OP37EP?
OP37EP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OP37EP 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 OP37EP?
For technical support, including OP37EP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OP37EP requirements.
6.How does Aetrix verify that OP37EP is sourced from the original manufacturer or authorized distributors?
All OP37EP 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 OP37EP meets industry standards.
7.What is the process for return or replacement of OP37EP?
All OP37EP units undergo pre-shipment inspection (PSI). If there is an issue with OP37EP, 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 OP37EP part is unused and in its original packaging.
Return procedure for OP37EP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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