AD843SQ/883B - 34MHz CBFET Fast Settling Op Amp | Analog Devices
MPN: AD843SQ/883B ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $25.43 | $25.43 |
| 10 | $23.12 | $231.20 |
| 100 | $20.81 | $2,081.00 |
| 500 | $18.5 | $9,250.00 |
| 1,000 | $16.19 | $16,190.00 |
Drop-in alternatives for AD843SQ/883B — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
AD843SH/883B
✅ Drop-In📋 Reference alternative (not in catalog)
AD843SQ/883B Maximum Ratings & Electrical Characteristics
| Amplifier Type | General Purpose |
| Number of Circuits | 1 |
| Unity Gain Bandwidth | 34 MHz |
| Settling Time | 135 ns (to 0.01%) |
| Slew Rate | 250 V/µs (typ) |
| Input Bias Current | 0.6 nA (typ) |
| Input Offset Voltage | 1 mV max (K/B grades) |
| Full Power Bandwidth | 3.9 MHz |
| Supply Voltage Range | ±4.5 V to ±18 V |
| Operating Temperature Range | -55°C to +125°C |
| Package | 8-CERDIP |
| Mounting Type | Through Hole |
| Crosstalk | -85 dB at 5 MHz |
| MIL-STD-883 | Class B compliant |
| RoHS Status | Non-compliant (hermetic package) |
AD843SQ/883B Pin Configuration
| Pin 1 | NULL — Offset null |
| Pin 2 | -IN — Inverting input |
| Pin 3 | +IN — Non-inverting input |
| Pin 4 | V- — Negative supply |
| Pin 5 | NULL — Offset null |
| Pin 6 | OUT — Output |
| Pin 7 | V+ — Positive supply |
| Pin 8 | NC — No connection |
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this component. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.
Typical Applications
AD843SQ/883B is suitable for 6 applications: High-Speed Data Acquisition, Video Signal Processing, Pulse Amplification, Active Filters, Instrumentation Amplifiers, Communication Systems.
High-Speed Data Acquisition
The AD843SQ/883B's 135 ns settling time to 0.01% and 34 MHz bandwidth make it ideal for driving high-speed ADCs and sample-and-hold circuits. Its low input bias current (0.6 nA) minimizes errors when interfacing with high-impedance sensors. In a data acquisition system, the op amp buffers the sensor signal and provides the necessary drive capability for the ADC input, ensuring accurate conversion of fast transients. The fast settling ensures that the ADC sees a stable voltage within its acquisition window, critical for maintaining system throughput.
Recommended
Video Signal Processing
With a 34 MHz unity-gain bandwidth and 250 V/µs slew rate, the AD843SQ/883B is well-suited for video amplification and buffering. It can handle composite video signals with minimal distortion, preserving edge sharpness and color accuracy. The high slew rate ensures that large voltage swings, such as sync pulses, are reproduced without slew-induced distortion. In video distribution amplifiers, the op amp provides the necessary drive current for multiple loads while maintaining signal integrity over long cable runs.
Recommended
Pulse Amplification
The AD843SQ/883B's fast settling and high slew rate make it excellent for amplifying narrow pulses in nuclear instrumentation, LIDAR, and radar systems. Its low input bias current reduces baseline drift in charge-sensitive preamplifiers. The 135 ns settling time ensures that the output accurately represents the pulse amplitude without overshoot or ringing, which is critical for pulse height analysis. The wide bandwidth preserves the pulse shape, allowing precise timing measurements.
Recommended
Active Filters
The 34 MHz bandwidth of the AD843SQ/883B allows the implementation of high-frequency active filters, such as Butterworth or Chebyshev low-pass filters, with cutoff frequencies in the megahertz range. Its high slew rate ensures that large amplitude signals do not cause distortion, maintaining filter accuracy. The low input bias current is beneficial in filter designs using high-value resistors, as it reduces DC offset errors. The op amp's stability at gains of 1 or greater simplifies filter design.
Recommended
Instrumentation Amplifiers
The AD843SQ/883B can be used as a building block in discrete instrumentation amplifiers, providing high speed and precision. Its low input bias current and offset voltage contribute to accurate measurement of small differential signals. The high common-mode rejection ratio, combined with the op amp's wide bandwidth, allows the instrumentation amplifier to reject interference while amplifying fast transients. This makes it suitable for medical instrumentation, industrial process control, and test equipment.
Recommended
Communication Systems
In communication systems, the AD843SQ/883B is used in IF (intermediate frequency) amplification, AGC (automatic gain control) circuits, and active filters. Its 34 MHz bandwidth covers common IF frequencies, and its fast settling time is beneficial in time-division multiplexing systems. The low distortion and high slew rate ensure signal fidelity in QAM and other modulation schemes. The device's military temperature range makes it suitable for aerospace and defense communication equipment.
Recommended
Recommended Products Summary
Engineering reference data for AD843SQ/883B — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | AD843SH/883B | AD843SE/883B | AD843JNZ | AD843JRZ-REEL | OPA627BP |
|---|---|---|---|---|---|---|
| Package | 8-CERDIP | 8-CERDIP (same) | 20-LCC | 8-PDIP | 8-SOIC | 8-PDIP |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Texas Instruments |
| Unity Gain Bandwidth | 34 MHz | 34 MHz | 34 MHz | 34 MHz | 34 MHz | 16 MHz |
| Slew Rate | 250 V/µs | 250 V/µs | 250 V/µs | 250 V/µs | 250 V/µs | 55 V/µs |
| Input Bias Current | 0.6 nA | 0.6 nA | 0.6 nA | 0.6 nA | 0.6 nA | 5 pA |
| Supply Voltage Range | ±4.5 V to ±18 V | ±4.5 V to ±18 V | ±4.5 V to ±18 V | ±4.5 V to ±18 V | ±4.5 V to ±18 V | ±4.5 V to ±18 V |
| Operating Temperature Range | -55°C to +125°C | -55°C to +125°C | -55°C to +125°C | 0°C to +70°C | 0°C to +70°C | -25°C to +85°C |
| MIL-STD-883 | Class B | Class B | Class B | No | No | No |
Key Differentiators
- MIL-STD-883 Class B screening (vs AD843JNZ)
- Hermetic CERDIP package (vs AD843JRZ-REEL)
- Higher slew rate and bandwidth (vs OPA627BP)
Design Notes
For optimal high-frequency performance, place 0.1 µF ceramic capacitors as close as possible to the V+ and V- pins (pins 7 and 4). Additionally, use a 10 µF tantalum capacitor in parallel for bulk decoupling. Keep the feedback network components close to the inverting input to minimize parasitic capacitance, which can cause peaking in the frequency response.
The AD843SQ/883B in a CERDIP package has a thermal resistance (θJA) of approximately 100°C/W. For high-power applications, ensure adequate airflow or heatsinking. The maximum junction temperature is 175°C, so calculate power dissipation (PD = (V+ - V-) * I_Q + (V+ - VOUT) * I_OUT) and ensure the junction temperature stays within limits.
Do not exceed the absolute maximum supply voltage of ±18 V. Also, avoid driving capacitive loads greater than 100 pF directly, as this can cause instability. If driving larger capacitive loads, use a series resistor (e.g., 50 Ω) at the output. Additionally, the input common-mode range is limited to within 2 V of the supply rails; ensure input signals stay within this range to avoid distortion.
Compliance Information
Hermetic CERDIP package contains lead-based solder, so not RoHS compliant. MIL-STD-883 Class B compliant.
