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Analog Devices Inc. AD843JN
- Part No.:
- AD843JN
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
AD843JN.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,373
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Product details
Overview
AD843JN from Analog Devices is a high-speed, CBFET-input operational amplifier designed for precision signal conditioning in demanding analog systems. It delivers 34 MHz unity-gain bandwidth, 250 V/µs slew rate, and 135 ns settling time to 0.01% for a 10 V step - enabling accurate buffering of 12-bit DAC/ADC outputs and fast sample-and-hold circuits in test equipment and data acquisition systems.
For engineers reviewing the AD843JN datasheet, AD843JN pinout, AD843JN application, or AD843JN equivalent, key selection criteria include its FET-input low bias current (0.6 nA typ), stability at unity gain without external compensation, and compatibility with ±15 V supplies and 500 Ω–∞ resistive loads.
Technical Context
The AD843JN uses Analog Devices' junction-isolated complementary bipolar (CB) process, combining FET-input DC precision with wideband AC performance. Its CBFET input stage achieves 0.6 nA typical input bias current while sustaining 34 MHz bandwidth and 250 V/µs slew rate - a combination unattainable in earlier monolithic op amps.
It operates stably at closed-loop gains ≥1 without external compensation across –40°C to +85°C (industrial grade), though AD843JN itself is rated for 0°C to +70°C. The device features offset null pins, laser-trimmed input offset voltage (1 mV max), and full-power bandwidth of 3.9 MHz into 20 VPP loads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Unity Gain Bandwidth | 34 MHz - supports stable unity-gain configurations for high-fidelity buffer applications |
| Settling Time (to 0.01%) | 135 ns for 10 V step - enables accurate sampling in >7 MHz effective Nyquist-rate systems |
| Slew Rate | 250 V/µs - ensures minimal distortion on fast-rising signals up to ~3.9 MHz full-power bandwidth |
| Input Bias Current | 0.6 nA typical - preserves signal integrity in high-impedance sensor interfaces and integrators |
| Input Offset Voltage | 1 mV maximum (J-grade) - reduces static error in precision gain stages and active filters |
| Supply Voltage Range | ±4.5 V to ±18 V - allows operation from standard ±15 V rails with margin for transient tolerance |
| Output Current | 50 mA minimum - drives 500 Ω loads directly without external boost circuitry |
Pinout & Package
AD843JN is supplied in an 8-pin plastic Mini-DIP (N-8) package with 0.300-inch width, through-hole mounting, and industry-standard pin spacing. Pin 1 is identified by a notch or dot; the package is RoHS-compliant and rated for 0°C to +70°C operation.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Offset Null | Connects to potentiometer wiper for manual input offset adjustment; optional for most J-grade applications |
| 2 | Inverting Input (–) | Differential input terminal; accepts feedback network for inverting configurations |
| 3 | Noninverting Input (+) | Differential input terminal; used for noninverting gain stages and unity-gain buffers |
| 4 | V– | Negative supply rail connection; must be bypassed with 0.1 µF ceramic + 2.2 µF tantalum capacitors |
| 5 | Offset Null | Second terminal of offset null potentiometer; completes trimming circuit with Pin 1 |
| 6 | Output | Amplified output node; capable of sourcing/sinking ≥50 mA into 500 Ω loads |
| 7 | V+ | Positive supply rail connection; requires same bypassing as Pin 4 for high-frequency stability |
| 8 | NC | No internal connection; left unconnected per datasheet - not used for thermal or shielding purposes |
Key Features
| Feature | Design Value |
|---|---|
| FET-input architecture with CBFET process | Delivers 0.6 nA input bias current while maintaining 34 MHz bandwidth - critical for high-Z integrators and photodiode amps |
| Unity-gain stable, no external compensation | Eliminates design risk and board space for compensation networks in buffer and gain-of-one applications |
| Laser-trimmed input offset voltage | 1 mV max (J-grade) - reduces calibration burden in multistage signal chains requiring <12-bit linearity |
| High slew rate + fast settling | 250 V/µs slew rate and 135 ns to 0.01% enable accurate reproduction of sub-100 ns transients in pulse processing |
| Full industrial temperature range support (via family variants) | While AD843JN is commercial-grade, pin-compatible AD843AN/BN variants extend operation to –40°C to +85°C |
Applications
| High-Speed Sample-and-Hold Amplifiers | High-Bandwidth Active Filters |
|---|---|
Use Scenario: Precision data acquisition systems requiring aperture times <50 ns and acquisition times ≤1 µs for 12-bit resolution. IC Role / Device Role / Timing Role: Buffer and hold amplifier in noninverting open-loop S/H architecture; provides 135 ns settling to 0.01% for accurate pedestal error control. Use Value: Enables 7+ MSPS effective sampling rates with <0.025% linearity error from CMRR and low input bias current. |
Use Scenario: Anti-aliasing and reconstruction filtering in digital communications transceivers operating up to 10 MHz. IC Role / Device Role / Timing Role: Gain stage and buffer in 4th-order Butterworth filter; maintains phase linearity and group delay flatness up to 3.9 MHz full-power bandwidth. Use Value: Preserves signal fidelity in QAM and OFDM waveforms via 34 MHz GBW and low harmonic distortion (<0.025% at 4.4 MHz). |
| High-Speed Integrators | High-Frequency Signal Conditioning |
Use Scenario: Laser pulse integration in time-of-flight (ToF) sensors and precision current-to-voltage conversion for photodiode arrays. IC Role / Device Role / Timing Role: Integrator core with FET-input minimizing leakage-induced drift; driven by low-impedance current sources. Use Value: Achieves <20 µV/µs droop rate due to 0.6 nA input bias current - extends integration window beyond 10 ms without reset. |
Use Scenario: Video signal amplification and RGB channel conditioning in broadcast-grade analog video equipment. IC Role / Device Role / Timing Role: DC-coupled buffer and level shifter for ±1 V video signals; drives 75 Ω coaxial lines with minimal overshoot. Use Value: Delivers 0.025% differential gain/phase error at 4.4 MHz - meets SMPTE 259M and ITU-R BT.601 broadcast standards. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed FET-input op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD841JN | Lower bandwidth (20 MHz), higher input bias current (2 nA), no offset null pins | Less suitable for 12-bit S/H or precision integrators requiring <135 ns settling | Select when cost sensitivity outweighs need for 34 MHz BW or 0.6 nA bias current |
| OPA600KP | Higher slew rate (400 V/µs), wider bandwidth (80 MHz), but higher quiescent current (18 mA) | Better for >10 MSPS sampling but less optimal for battery-powered or thermally constrained designs | Choose when full-power bandwidth >5 MHz and settling <70 ns are mandatory |
Compared with AD843JN, AD841JN trades bandwidth and input bias performance for lower cost and simpler layout, while OPA600KP offers superior speed at the expense of power efficiency and thermal management complexity - making AD843JN the balanced choice for 12-bit, ±15 V, 0°C–70°C precision analog front-ends.
Availability
AD843JN is available at Aetrix Electronics and suitable for high-speed data acquisition, precision test instrumentation, broadcast video signal conditioning, and industrial analog front-end designs requiring stable component supply across extended production cycles.
Supply support for AD843JN 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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA.
The AD843 belongs to Analog Devices' wideband operational amplifier family, engineered specifically for applications demanding simultaneous high DC precision and RF-grade AC performance in single-supply and dual-supply configurations.
FAQ
What is the maximum operating temperature range for AD843JN?
The AD843JN is rated for commercial temperature operation from 0°C to +70°C. This specification is guaranteed per the datasheet's "AD843J/A" column and applies to all electrical parameters under rated supply conditions (±15 V). Operation outside this range may result in degraded offset voltage, increased bias current, or instability - use AD843AN or AD843BN for industrial-range (-40°C to +85°C) applications.
Does AD843JN require external compensation for unity-gain stability?
No, AD843JN does not require external compensation at closed-loop gains of 1 or greater. Its internal compensation ensures unconditional stability across the full operating temperature range and into capacitive loads up to 20 pF. For heavier capacitive loads (>20 pF), the recommended buffered configuration (Figure 23a in the datasheet) maintains clean transient response without altering compensation.
What is the purpose of Pins 1 and 5 on AD843JN?
Pins 1 and 5 on AD843JN are dedicated offset null terminals. They connect to opposite ends of a 10 kΩ potentiometer (wiper to Pin 1, ends to Pins 1 and 5), allowing manual adjustment of input offset voltage. While laser trimming limits initial offset to 1 mV max, these pins provide fine calibration capability in systems where residual offset must be reduced below 100 µV - especially in multistage precision gain blocks.
Can AD843JN drive a 50 Ω load?
AD843JN is not specified to drive 50 Ω loads continuously. Its output current is guaranteed ≥50 mA into ≥500 Ω loads, but driving 50 Ω would demand >300 mA at ±10 V - exceeding safe operating area limits and risking thermal shutdown or parametric shift. For 50 Ω interfaces, use a current-boosting stage or select a driver-rated op amp like the AD8009 or THS3091.
Is AD843JN compatible with SOIC or LCC packages?
No, AD843JN is exclusively packaged in the 8-pin plastic Mini-DIP (N-8) format. Other variants exist in different packages - e.g., AD843JR–16 (16-pin SOIC), AD843SE/883B (20-pin LCC), and AD843BH (12-pin metal can) - but AD843JN itself has no SOIC or LCC footprint. Board designs must accommodate through-hole DIP mounting with 0.300-inch lead spacing.
AD843JN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- 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:
- 250V/µs
- Gain Bandwidth Product:
- 34 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 50 pA
- Voltage - Input Offset:
- 1 mV
- Current - Supply:
- 12mA
- Current - Output / Channel:
- 50 mA
- Voltage - Supply Span (Min):
- 9 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
AD843JN FAQ
1.How can I place an order for AD843JN through Aetrix?
Please submit a Request for Quotation (RFQ) for AD843JN 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 AD843JN reliable?
The price and inventory of AD843JN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD843JN is usually 5 days.
3.What payment methods are accepted for AD843JN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD843JN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD843JN?
AD843JN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD843JN 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 AD843JN?
For technical support, including AD843JN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD843JN requirements.
6.How does Aetrix verify that AD843JN is sourced from the original manufacturer or authorized distributors?
All AD843JN 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 AD843JN meets industry standards.
7.What is the process for return or replacement of AD843JN?
All AD843JN units undergo pre-shipment inspection (PSI). If there is an issue with AD843JN, 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 AD843JN part is unused and in its original packaging.
Return procedure for AD843JN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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