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AD843:  34 MHz, CBFET Fast Settling Op Amp

Product Details

The AD843 is a fast settling, 34 MHz, CBFET input op amp. The AD843 combines the low (0.6 nA) input bias currents characteristic of a FET input amplifier while still providing a 34 MHz bandwidth and a 135 ns settling time (to within 0.01% of final value for a 10 volt step). The AD843 is a member of the Analog Devices' family of wide bandwidth operational amplifiers. These devices are fabricated using Analog Devices' junction isolated complementary bipolar (CB) process. This process permits a combination of dc precision and wideband ac performance previously unobtainable in a monolithic op amp.

The 250 V/µs slew rate and 0.6 nA input bias current of the AD843 ensure excellent performance in high speed sample-and-hold applications and in high speed integrators. This amplifier is also ideally suited for high bandwidth active filters and high frequency signal conditioning circuits.

Unlike many high frequency amplifiers, the AD843 requires no external compensation and it remains stable over its full operating temperature range. It is available in five performance grades: the AD843J and AD843K are rated over the commercial temperature range of 0°C to +70°C. The AD843A and AD843B are rated over the industrial temperature range of -40°C to +85°C. The AD843S is rated over the military temperature range of -55°C to +125°C and is available processed to MIL-STD-883B, Rev. C.


  • Unity Gain Bandwidth: 34 MHz
  • Fast Settling: 135 ns to 0.01%
  • Slew Rate: 250 V/µs
  • Input Offset Voltage: 1 mV max (AD843K/B)
  • Input Bias Current: 0.6 nA typ
  • Input Voltage Noise: 19 nV/vHz
  • Open Loop Gain: 30 V/mV into a 500 Ω Load
  • Output Current: 50 mA min
  • Supply Current: 13 mA max
  • Available in 8-Pin Plastic Mini-DIP &
    Cerdip, 16-Pin SOIC, 20-Pin LCC and
    12-Pin Hermetic Metal Can Packages
  • Chips and MIL-STD-883B Parts Also Available

Pin Configuration Diagram for AD843


Title Content Type File Type
AD843: 34 MHz, CBFET Fast Settling Op Amp Data Sheet  (Rev D, 10/2006) (pdf, 454 kB) Data Sheets PDF
AN-581: Biasing and Decoupling Op Amps in Single Supply Applications  (pdf, 166 kB) Application Notes PDF
AN-402: Replacing Output Clamping Op Amps with Input Clamping Amps  (pdf, 55 kB)
So far most clamping amplifiers have relied upon an output clamping architecture and are called output clamp amps (OCAs). A new architecture called an input clamp amp (ICA) offers superior clamping accuracy and lower distortion.
Application Notes PDF
AN-417: Fast Rail-to-Rail Operational Amplifiers Ease Design Constraints in Low Voltage High Speed Systems  (pdf, 228 kB)
Movement towards lower power supply voltages is driven by the demand that systems consume less and less power coupled with the desire to reduce the number of power supply voltages in the system. The following applications are discussed: Single-Ended and Differential Input ADC Input Circuits, Video Line Driver, Active Filter, HDSL Transceiver, and Transformer Drive Circuits.
Application Notes PDF
MT-060: Choosing Between Voltage Feedback and Current Feedback Op Amps  (pdf, 62 kB) Tutorials PDF
MT-059: Compensating for the Effects of Input Capacitance on VFB and CFB Op Amps Used in Current-to-Voltage Converters  (pdf, 69 kB) Tutorials PDF
MT-058: Effects of Feedback Capacitance on VFB and CFB Op Amps  (pdf, 66 kB) Tutorials PDF
MT-056: High Speed Voltage Feedback Op Amps  (pdf, 109 kB) Tutorials PDF
MT-053: Op Amp Distortion: HD, THD, THD + N, IMD, SFDR, MTPR  (pdf, 104 kB) Tutorials PDF
MT-052: Op Amp Noise Figure: Don't Be Misled  (pdf, 60 kB) Tutorials PDF
MT-050: Op Amp Total Output Noise Calculations for Second-Order System  (pdf, 38 kB) Tutorials PDF
MT-049: Op Amp Total Output Noise Calculations for Single-Pole System  (pdf, 40 kB) Tutorials PDF
MT-048: Op Amp Noise Relationships: 1/f Noise, RMS Noise, and Equivalent Noise Bandwidth  (pdf, 81 kB) Tutorials PDF
MT-047: Op Amp Noise  (pdf, 72 kB) Tutorials PDF
MT-033: Voltage Feedback Op Amp Gain and Bandwidth  (pdf, 251 kB) Tutorials PDF
MT-032: Ideal Voltage Feedback (VFB) Op Amp  (pdf, 65 kB) Tutorials PDF
A Stress-Free Method for Choosing High-Speed Op Amps
A decision-tree approach to making the critical decision about high-speed op amp selection, including a look at some helpful tools.
Webcasts WEBCAST
ADI Warns Against Misuse of COTS Integrated Circuits  (pdf, 13 kB)
(Revised 1/03)
Invites Customer Participation in Creative Mil/Aero System Solutions
Recommended Reading PDF
Space Qualified Parts List  (pdf, 93 kB)
This document lists 67 (240+) space level products that are available from Analog Devices. Many of the products listed are state-of-the-art data conversion and signal processing products that were previously only available as commercial or military Class B products. Through our Space Products Group and MIL-PRF-38535 certified Level V (Class S) facility, we are pleased to offer these products to the space marketplace.
Aerospace Information PDF
RAQs index Rarely Asked Questions HTML
Glossary of EE Terms Glossary HTML

Design Tools,Models,Drivers & Software

Title Content Type File Type
dBm/dBu/dBv Calculator
This calculator converts between standard units of power measurement and signal strength.
Utilities and Conversions HTML
Power Dissipation vs Die Temp
This tool estimates die temperature and power dissipation based on the supply voltages, ambient temperature, load characteristics, and package thermal data.
Utilities and Conversions HTML
This tool will help with the selection, evaluation and troubleshooting of voltage feedback Op-Amps. It uses typical data to model the behavior of a selected amplifier. It allows a user to select an amplifier, configure a circuit, apply a signal and evaluate the performance. It is useful for checking an amplifier's spec's such as Bandwidth, Slew Rate, Input/Output Range, Gain Error, Load Current, Stability Issues and DC Errors in a given circuit.
ADIsim Design/Simulation Tools HTML
OpAmp Stability
An applet for demonstrating stability effects in opamp buffers.
Design Calculators HTML
AD843 SPICE Macro-Model SPICE Models HTML

Evaluation Kits & Symbols & Footprints

Symbols and Footprints— Analog Devices offers Symbols & Footprints which are compatible with a large set of today’s CAD systems for broader and easier support.

SampleSample & Buy

Price, packaging, availability

AD843 Model Options
Model Package Pins Temp.
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
5962-9098001M2A Status: Production LCC:CER LEADLESS CHIP CARR 20 Mil Tube, 54 $101.07 $91.37 N  Material Info PCN Purchase
5962-9098001MPA Status: Production 8 ld CerDIP 8 Mil Tube, 48 $54.71 $49.46 N  Material Info PCN Purchase
AD843AQ Status: Production 8 ld CerDIP 8 Ind Tube, 48 $10.84 $9.23 N  Material Info PCN Purchase
AD843BQ Status: Production 8 ld CerDIP 8 Ind Tube, 48 $12.69 $10.76 N  Material Info PCN Purchase
AD843JCHIPS Status: Production CHIPS OR DIE 0 Comm. Tray, 130 - $6.73 Y  Material Info Notify Me Contact ADI
AD843JN Status: Production 8 ld PDIP 8 Comm. Tube, 50 $6.09 $5.17 N  Material Info PCN Purchase
AD843JNZ Status: Production 8 ld PDIP 8 Comm. Tube, 50 $5.55 $4.71 Y  Material Info PCN Purchase
AD843JR-16 Status: Last Time Buy 16 ld SOIC - Wide 16 Comm. Tube, 47 $6.70 $5.69 N  Material Info PCN/PDN Purchase
AD843JRZ-16 Status: Production 16 ld SOIC - Wide 16 Comm. Tube, 47 $6.10 $5.19 Y  Material Info PCN Purchase
AD843JRZ-16-REEL Status: Production 16 ld SOIC - Wide 16 Comm. Reel, 1000 - $5.19 Y  Material Info PCN Purchase
AD843JRZ-16-REEL7 Status: Production 16 ld SOIC - Wide 16 Comm. Reel, 250 - $5.19 Y  Material Info PCN Purchase
AD843KNZ Status: Production 8 ld PDIP 8 Comm. Tube, 50 $6.31 $5.36 Y  Material Info PCN Purchase
AD843SCHIPS Status: Production CHIPS OR DIE 0 Mil Tray, 100 $31.00 $28.18 Y  Material Info Notify Me Contact ADI
AD843SH/883B Status: Last Time Buy 12 ld Header 12 Mil Tube, 100 $71.62 $64.45 N  Material Info PCN/PDN Purchase
AD843SQ Status: Production 8 ld CerDIP 8 Mil Tube, 48 $29.10 $27.63 N  Material Info PCN Purchase
AD843SQ/883B Status: Production 8 ld CerDIP 8 Mil Tube, 48 $49.74 $44.76 N  Material Info PCN Purchase
Price Table Help

The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.

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