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Analog Devices Inc. OP37EPZ
- Part No.:
- OP37EPZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
OP37EPZ.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:494
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Product details
Overview
OP37EPZ 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 hermetic DIP package, widely used in microphone preamplifiers, RIAA phono stages, and high-resolution data acquisition signal conditioning.
For engineers reviewing the OP37EPZ datasheet, OP37EPZ pinout, OP37EPZ application, or OP37EPZ equivalent, this page provides verified technical context, validated pin functions, real-world application mappings, and two confirmed alternative op amps with documented performance trade-offs - all specific to the OP37EPZ's military-grade temperature range (–25°C to +85°C) and hermetic Z-suffix packaging.
Technical Context
The OP37EPZ employs a decompensated internal architecture requiring minimum closed-loop gain of 5 for stability, enabling higher slew rate (17 V/µs) and bandwidth (63 MHz) than unity-gain-stable counterparts like the OP27. Its input stage uses bias-current cancellation to achieve 10 nA typical input bias current while maintaining ultra-low voltage noise.
Offset voltage is trimmed at wafer level using zener-zap technology, yielding ≤25 µV typical VOS and 0.2 µV/°C drift; external nulling via pins 1 and 8 supports fine adjustment without degrading thermal drift. The output stage drives ±10 V into 600 Ω with low distortion, supporting professional audio line-driving requirements.
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 dominating system noise floor |
| Slew Rate | 17 V/µs - supports fast transient response in active filters and wideband instrumentation without slew-induced distortion |
| Gain-Bandwidth Product | 63 MHz - allows stable operation at G ≥ 5 with usable bandwidth >10 MHz for precision high-speed signal chains |
| Input Offset Voltage | 25 µV max (typical 10 µV) - ensures <0.001% gain error in 10 V full-scale precision measurement front-ends |
| CMRR | 126 dB @ ±11 V common-mode - rejects power supply ripple and EMI in single-supply-derived bipolar rails |
| Operating Temperature Range | –25°C to +85°C - qualified for industrial and commercial environments where extended thermal stability is required |
| Package | 8-Lead Hermetic DIP (Z suffix) - provides moisture resistance and long-term reliability in harsh or high-reliability applications |
Pinout & Package
OP37EPZ is housed in an 8-lead hermetic dual-in-line package (DIP), offering superior environmental sealing and thermal stability versus plastic variants. Pin functions are electrically identical across OP37 family variants but mechanically fixed per Z-suffix mechanical drawing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VOS ADJ (Null) | Connects to one end of 10 kΩ potentiometer for manual offset trimming; does not affect thermal drift when adjusted |
| 2 | Inverting Input (–) | Differential input node; high-impedance (1.3 MΩ differential, 2.5 GΩ common-mode) for minimal loading of source |
| 3 | Non-Inverting Input (+) | Differential input node; matched to Pin 2 for optimal CMRR and bias current rejection |
| 4 | V– | Negative supply rail connection; must be decoupled locally to minimize PSRR degradation |
| 5 | NC | No internal connection; left unconnected per datasheet - not used for thermal or shielding purposes |
| 6 | Output | Class AB output stage capable of ±10 V swing into 600 Ω; requires external 50 Ω series resistor for >1000 pF capacitive loads |
| 7 | V+ | Positive supply rail connection; supports ±4 V to ±18 V total supply; PSRR >120 dB reduces supply ripple coupling |
| 8 | VOS ADJ (Null) | Connects to other end of 10 kΩ potentiometer; forms balanced nulling network with Pin 1 for zero-offset calibration |
Key Features
| Feature | Design Value |
|---|---|
| Low 1/f noise corner | 2.7 Hz - ensures minimal low-frequency drift in DC-coupled precision instrumentation and strain gauge interfaces |
| Zener-zap offset trimming | Stable wafer-level trim with <0.2 µV/month long-term drift - eliminates need for field recalibration in sealed systems |
| Bias-current cancellation | 10 nA typical IB, 7 nA typical IOS - enables use with high-Z sources (e.g., piezoelectric sensors, tape heads) without significant offset error |
| High open-loop gain | 1.8 million (125 dB) - maintains accuracy in high-gain configurations (G > 100) with minimal loop gain loss |
| Guaranteed load drive | ±10 V into 600 Ω with <0.01% THD - meets professional audio line-driver requirements without external buffers |
Applications
| Microphone Preamplifier | RIAA Phono Equalization |
|---|---|
|
Use Scenario: Amplifying low-level (<10 mV) condenser microphone outputs with 200 Ω–2 kΩ source impedance in studio recording interfaces. IC Role / Device Role / Timing Role: Primary low-noise gain block in first-stage amplification, directly coupled to microphone capsule. Use Value: 3.0 nV/√Hz noise density dominates system noise only above ~1.5 kΩ source resistance, preserving SNR in critical front-end stage. |
Use Scenario: Implementing precise RIAA equalization curve (3180/318/75 µs time constants) for vinyl playback with <0.1 dB passband flatness. IC Role / Device Role / Timing Role: High-gain, low-distortion feedback amplifier hosting frequency-selective RC network in inverting configuration. Use Value: 63 MHz GBW ensures phase margin >70° across full RIAA band (20 Hz–20 kHz), eliminating equalization errors from limited bandwidth. |
| Tape Head Signal Conditioning | High-Resolution Data Acquisition |
|
Use Scenario: Recovering analog audio signals from magnetic tape heads with 1–1.5 kΩ impedance and strong low-frequency content. IC Role / Device Role / Timing Role: First-stage transimpedance or voltage amplifier in NAB-equalized playback circuitry. Use Value: Low 0.2 µV/°C drift prevents thermal-induced baseline shift during extended playback sessions; 17 V/µs slew avoids slew-rate limiting on transient peaks. |
Use Scenario: Buffering and gain-setting for 16–24-bit SAR or delta-sigma ADC front-ends in test equipment and medical instrumentation. IC Role / Device Role / Timing Role: Precision driver between anti-alias filter and ADC input, providing low-impedance, low-noise, low-distortion interface. Use Value: 126 dB CMRR rejects common-mode noise from shared digital/analog grounds; 25 µV VOS contributes <0.0004% error in 10 V full-scale 24-bit systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision high-speed operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OP27GPZ | Unity-gain stable; lower slew rate (8 V/µs); higher VOS (25 µV typ); same 8-lead hermetic DIP package | Preferred for G = 1–4 circuits (e.g., active filters, integrators); unsuitable for G ≥ 5 high-speed designs requiring >10 MHz bandwidth | Select OP27GPZ only if unity-gain stability is mandatory and bandwidth/slew demands are relaxed. |
| OP1177ARZ | Rail-to-rail output; lower power (680 µA vs. 4 mA); higher VOS (60 µV max); SO-8 package only - no hermetic DIP option | Used in low-power, space-constrained industrial sensors; lacks drive strength and speed for audio or fast DAQ front-ends | Choose OP1177ARZ for battery-powered or thermally constrained designs where 17 V/µs slew and ±10 V swing are unnecessary. |
Compared with OP27GPZ and OP1177ARZ, the OP37EPZ uniquely combines hermetic DIP reliability, decompensated speed (63 MHz GBW), and ultra-low voltage noise - making it irreplaceable in high-fidelity audio and high-gain precision signal chains where both stability at G ≥ 5 and sub-4 nV/√Hz noise are simultaneously required.
Availability
OP37EPZ is available at Aetrix Electronics and suitable for microphone preamplifiers, RIAA phono stages, and high-resolution data acquisition systems requiring stable component supply with guaranteed hermetic packaging and extended temperature qualification.
Supply support for OP37EPZ 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 communications markets since 1965.
The OP37EPZ belongs to Analog Devices' legacy precision op amp product line, engineered specifically for high-speed, low-noise, high-gain (>5) signal conditioning in audio, test equipment, and sensor interface applications.
FAQ
What is the minimum stable closed-loop gain for OP37EPZ?
The OP37EPZ 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 63 MHz gain-bandwidth and 17 V/µs slew rate - key differentiators versus unity-gain-stable op amps like the OP27. Always verify stability with simulation or bench testing when operating near G = 5.
Does OP37EPZ support rail-to-rail input or output?
No, OP37EPZ does not support rail-to-rail input or output. Its input common-mode range is ±11 V with ±15 V supplies, and output swing is ±10 V into 600 Ω. It cannot operate with inputs within 1.5 V of either rail or deliver output within 2 V of V+ or V–. For rail-to-rail operation, consider modern alternatives like AD8605, but note they lack the OP37EPZ's 3.0 nV/√Hz noise and hermetic DIP packaging.
Can OP37EPZ replace OP07 or OP27 in existing sockets?
Yes, OP37EPZ is pin-compatible with OP07 and OP27 in 8-lead DIP sockets and may be inserted directly without PCB changes. However, external nulling components designed for OP07 may need removal or modification, as OP37EPZ's internal offset trim differs. Also confirm gain configuration: OP37EPZ requires G ≥ 5, whereas OP07 operates down to G = 1.
What is the purpose of Pins 1 and 8 on OP37EPZ?
Pins 1 and 8 are dedicated offset null terminals for external trimming. A 10 kΩ potentiometer is connected across them, with its wiper to V– (Pin 4), allowing adjustment of input offset voltage by ±4 mV. This nulling does not degrade thermal drift (TCVOS) when using 10 kΩ; smaller pots increase drift sensitivity. These pins have no function if left unconnected.
Is OP37EPZ suitable for single-supply operation?
OP37EPZ is specified for dual-supply operation (±4 V to ±18 V). While it can function with asymmetric supplies (e.g., +15 V / –5 V), true single-supply use (e.g., +15 V / GND) violates its input common-mode and output swing specifications. For single-supply designs, use rail-to-rail input/output op amps such as ADA4077-2, but recognize they do not match OP37EPZ's 3.0 nV/√Hz noise or hermetic reliability.
OP37EPZ 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:
- 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
OP37EPZ FAQ
1.How can I place an order for OP37EPZ through Aetrix?
Please submit a Request for Quotation (RFQ) for OP37EPZ 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 OP37EPZ reliable?
The price and inventory of OP37EPZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OP37EPZ is usually 5 days.
3.What payment methods are accepted for OP37EPZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OP37EPZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OP37EPZ?
OP37EPZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OP37EPZ 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 OP37EPZ?
For technical support, including OP37EPZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OP37EPZ requirements.
6.How does Aetrix verify that OP37EPZ is sourced from the original manufacturer or authorized distributors?
All OP37EPZ 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 OP37EPZ meets industry standards.
7.What is the process for return or replacement of OP37EPZ?
All OP37EPZ units undergo pre-shipment inspection (PSI). If there is an issue with OP37EPZ, 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 OP37EPZ part is unused and in its original packaging.
Return procedure for OP37EPZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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