Analog Devices Inc. OP400HPZ

Summary of OP400HPZ Quad Precision Operational Amplifier from Analog Devices Inc.

The OP400HPZ from Analog Devices Inc. is a high-performance, low-power, quad operational amplifier offered in a standard 14-pin plastic dual in-line package (PDIP). Designed to meet the requirements of high-precision analog circuits while reducing board space and power consumption, the OP400HPZ integrates four independent amplifiers in a single IC. This model conforms to industry-standard pinouts, facilitating straightforward integration into existing designs. It stands out as the first monolithic quad op amp to feature “OP77-type” performance, catering to applications in precision instrumentation, low-noise signal conditioning, and power-limited or high-density systems.

Main Features and Benefits of the OP400HPZ

The OP400HPZ is engineered to deliver exceptional performance while minimizing resource overhead. Several critical features contribute to its appeal for design engineers:

Ultra-low input offset voltage, maximum of 150 μV, ensures minimal signal error at the input, even in precision applications.

Offset voltage drift is limited to just 1.2 μV/°C across -55°C to +125°C, guaranteeing performance stability in varying thermal environments.

Supply current consumption per amplifier is just 725 μA (maximum), saving power in multi-channel systems and making the OP400HPZ especially attractive for portable or energy-sensitive designs.

Open-loop voltage gain exceeds 5000 V/mV into a 10 kΩ load, delivering robust linear amplification and high loop accuracy.

Input bias current remains under 3 nA, assisting in minimizing loading effects and signal degradation, particularly in high-impedance sensor applications.

Noise voltage density is notably low at 11 nV/√Hz (1 kHz), surpassing most competing quad amplifiers, thereby improving SNR in precision analog signal paths.

Input common-mode rejection ratio (CMR) is rated greater than 120 dB, and power supply rejection ratio (PSRR) is below 1.8 μV/V, allowing the OP400HPZ to maintain accuracy even with supply or signal common-mode fluctuations.

Capable of stable operation with capacitive loads up to 10 nF, offering flexibility in driving large load capacitances without oscillations.

A key distinguishing attribute is the internal Zener zap trimming, providing the low offset without the need for external nulling adjustments. Moreover, total current drawn by the quad is less than that of classic single-amplifier designs such as the OP07, enabling advanced performance in compact footprints.

In-depth Analysis of OP400HPZ Electrical and Thermal Specifications

For rigorous evaluation and optimal implementation, engineers require access to reliable and precise parametric data:

Input offset voltage: Typ 40 μV, max 150 μV (OP400A/E), with long-term stability of 0.1 μV/month.

Input bias current: Typically 0.75 nA, max 3 nA at 25°C; drift and common-mode effects are well-characterized for tight designs.

Input voltage range: ±12 V min, ensuring wide input compatibility and headroom.

Large signal voltage gain: Min 5000 V/mV at 10 kΩ load—retained even under lower resistance loading.

Output voltage swing: ±12 V (minimum) at 10 kΩ load, suitable for full range, rail-to-rail output applications given symmetric supplies.

Differential input voltage tolerance: ±30 V.

Slew rate: 0.15 V/μs, providing adequate response speed for general-purpose and lower-frequency precision applications.

Gain bandwidth product: 500 kHz, supporting a range of AC signal processing requirements.

Operating temperature range: -55°C to +125°C for military-grade (OP400A), -40°C to +85°C (OP400H), and other variants for industrial and commercial applications.

Package thermal performance: For the 14-PDIP, thermal resistance θJA is 76°C/W (Junction-to-ambient), supporting robust dissipation management in PCB designs.

Notably, the OP400HPZ is protected against output short-circuit indefinitely and features robust electrostatic discharge (ESD) structures. Its operational stability—both DC and dynamic—coupled with competitive noise specifications (input voltage noise: 22 nV/√Hz at 10 Hz, 11 nV/√Hz at 1 kHz) ensures suitability in low-level signal chains.

Packaging, Environmental Ratings, and Compliance Information for OP400HPZ

OP400HPZ is available in a standard 14-lead plastic dual in-line package (14-PDIP, 0.300"/7.62 mm), which is widely used for through-hole applications and convenient for prototyping and socketed designs. The model is also available in corresponding SOIC and CERDIP variants should surface-mount or enhanced thermal performance be required.

Key compliance and environmental details include:

RoHS3 compliant (lead-free, environmentally safe construction).

Moisture Sensitivity Level (MSL) 1 (unlimited shelf life under appropriate storage).

REACH status: unaffected.

ESD caution—device handled as sensitive electronic component; appropriate personnel and workstation grounding are required for safe handling.

In engineering environments where reliability, traceability, and environmental compliance are required, these attributes ensure streamlined integration into certified products and systems.

Common Uses and Example Engineering Applications of the OP400HPZ

As a high-precision, quad-channel, general-purpose operational amplifier, OP400HPZ is well positioned for a range of engineering scenarios where multiple low-noise, low-offset op amps are required in a single design. Example use cases include:

Instrumentation amplifiers for sensor readout, data acquisition, and medical diagnostics, where low offset and drift directly enhance system accuracy.

Bipolar current transmitters and analog output stages in industrial automation and process control, where low supply current and stable performance over temperature are critical.

Differential and multiple-output tracking voltage references used in data converters, analog multiplexers, or calibration systems.

Active filtering, precision integrators, and charge amplifiers in test equipment, laboratory instruments, and scientific instrumentation.

Portable and battery-powered measurement systems, where minimal power draw and reduced PCB area are at a premium.

The device’s immunity to common-mode and supply noise, together with stability into capacitive loads, enables robust operation in noisy industrial and demanding analog-to-digital interface environments.

Alternative and Substitute Options Comparable to the OP400HPZ

In scenarios where OP400HPZ may be unavailable, or where alternative sourcing is considered, engineers may reference devices that offer similar electrical performance and package attributes. The following models are potential alternatives:

LM324 series (multiple vendors): Quad general-purpose operational amplifier; while popular and pin-compatible, LM324 typically features higher input offset and input bias currents, making it less suitable for precision-critical roles.

TL084/TL074 series (Texas Instruments and others): Low-noise JFET-input quad op amps with wider bandwidth, but different input characteristics and higher power consumption.

OP404 (Analog Devices Inc.): Comparable quad precision op amp featuring low offset and drift, designed as a higher-spec direct alternative within Analog Devices’ portfolio.

LT1014 (Analog Devices Inc.): Precision quad op amp with similar offset and noise performance, also available in 14-PDIP.

Proper selection among these alternatives will depend on the specific requirements for offset voltage, bias current, noise, supply current, and package style for the target application.

Conclusion

The Analog Devices OP400HPZ delivers a compelling mix of precision, low power consumption, and ease of integration for multi-channel analog circuit design. Its advanced offset, noise, and drift characteristics, along with its robust operation and universal 14-PDIP package, make it a premier choice for portable, industrial, and instrumentation applications where board space and precision cannot be sacrificed. Armed with a full understanding of the OP400HPZ’s specifications and performance parameters, engineers and procurement professionals can confidently select and deploy this device in their next-generation analog systems, or identify suitable alternatives as dictated by their application’s priorities.