ADA4622-1ARJZ-R7 - 30V 8MHz JFET Precision Op Amp | Analog Devices
MPN: ADA4622-1ARJZ-R7 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $7.68 | $7.68 |
| 10 | $6.91 | $69.10 |
| 100 | $5.62 | $562.00 |
| 500 | $4.65 | $2,325.00 |
| 1,000 | $3.92 | $3,920.00 |
ADA4622-1ARJZ-R7 Overview
A precision operational amplifier (op amp) is a high-gain differential voltage amplifier whose input offset voltage, input bias current, and noise are minimized so that the closed-loop behaviour of the circuit is dominated by the external feedback network rather than the device itself. Precision op amps sit at the top of the analog-IC hierarchy between general-purpose amplifiers and instrumentation amplifiers, and they form the foundational building block for signal conditioning in data-acquisition front ends, transducer bridges, photodiode transimpedance amplifiers, and active filters across industrial, instrumentation, medical, and audio systems.
Key features of the ADA4622-1 include 8 MHz gain-bandwidth product, 6 pA typical input bias current (JFET input), 350 µV maximum input offset voltage (B-grade equivalent, verify on datasheet), 120 dB open-loop gain, 0.0007% THD at 1 kHz, rail-to-rail output swing, and -40 °C to +125 °C extended industrial temperature range. The part is unity-gain stable and is specified at +5 V, ±5 V, and ±15 V supply rails, simplifying mixed-voltage system design.
Architecturally, the device pairs a JFET input differential pair for near-zero gate leakage with a high-voltage CMOS output stage capable of driving 2 kΩ loads to within millivolts of either rail. The combination avoids the trade-off between low bias current and high output swing that traditionally forced designers to choose either a JFET-input/bipolar-output or a CMOS-input/CMOS-output topology.
Typical applications include precision current sensing with high-side or low-side shunt amplifiers, photodiode transimpedance amplifiers, active filter stages for anti-aliasing, 16-/18-bit SAR ADC drivers, instrumentation front ends, medical instrumentation signal paths, and industrial process-control analog I/O. The wide supply range also supports battery-stack monitoring and 24 V industrial-bus interfaces.
When designing with the ADA4622-1 in the SOT-23-5 footprint, mind that the exposed lead frame (pin 5 / thermal tab) is internally connected to V− or to a no-connect depending on layout variant; consult the ADI datasheet before using pin 5 as a thermal pad. Decouple each supply pin with 100 nF OFL: X7R ceramic placed within 5 mm of the pin, and add a bulk 10 µF tantalum or aluminum-polymer cap to suppress load-step ringing.
This page synthesizes distributor pricing, drop-in SOT-23-5 alternatives, parametric comparison, and practical design notes not found in the bare ADI datasheet, with full provenance to manufacturer documentation and cross-reference data.
Drop-in alternatives for ADA4622-1ARJZ-R7 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with ADA4622-1ARJZ-R7 (same form factor and footprint) — differing in Amplifier Type, Manufacturer, Number of Channels, Output Type, Input Bias Current.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ADA4622-1ARJZ-R2
✅ Drop-In✓ In Stock
$2.62 / Unit
View Datasheet →ADA4622-1ARJZ-RL
✅ Drop-In📋 Reference alternative (not in catalog)
ADA4622-2ARZ-RL
✅ Drop-In📋 Reference alternative (not in catalog)
OPA2188BIDR
✅ Drop-In📋 Reference alternative (not in catalog)
OPA172IDR
✅ Drop-In📋 Reference alternative (not in catalog)
AD8628ARTZ-REEL2
✅ Drop-In📋 Reference alternative (not in catalog)
ADA4622-1ARJZ-R7 Maximum Ratings & Electrical Characteristics
| Manufacturer | Analog Devices, Inc. |
| Part Family | ADA4622-1 / ADA4622-2 / ADA4622-4 |
| Amplifier Type | J-FET Precision Operational Amplifier |
| Number of Channels | 1 |
| Output Type | Rail-to-Rail (RRO) |
| Supply Voltage Range (Single) | 5 V to 30 V |
| Supply Voltage Range (Dual) | ±2.5 V to ±15 V |
| Specified Supply Rails | +5 V, ±5 V, ±15 V |
| Gain Bandwidth Product | 8 MHz |
| Input Bias Current | 6 pA typical (JFET input) |
| Open-Loop Gain (AOL) | 120 dB |
| Total Harmonic Distortion + Noise | 0.0007% at 1 kHz |
| Operating Temperature Range | -40 °C to +125 °C |
| Package | SOT-23-5 (RJ), 5-pin |
| Mounting Type | Surface Mount |
| Reel Size | 7-inch (R7) |
| MSL Level | 1 |
| RoHS Status | Compliant |
| Lead-Free | Yes |
ADA4622-1ARJZ-R7 Pin Configuration
| Pin 1 | OUT — Amplifier output (rail-to-rail) |
| Pin 2 | V- — Negative supply (or GND for single-supply) |
| Pin 3 | IN+ — Non-inverting input (JFET) |
| Pin 4 | V+ — Positive supply (5 V to 30 V) |
| Pin 5 | IN- — Inverting input (JFET) |
Typical Applications
ADA4622-1ARJZ-R7 is suitable for 7 applications: Photodiode Transimpedance Amplifier (TIA), High-Side Current Sense Amplifier, 16/18-Bit SAR ADC Driver, Precision Instrumentation Front End, Active Filter (Sallen-Key / Multiple-Feedback), Medical Instrumentation Signal Path, Industrial Process-Control Analog I/O.
Photodiode Transimpedance Amplifier (TIA)
The ADA4622-1 is well matched to photodiode transimpedance applications because its 6 pA typical JFET input bias current introduces negligible DC error into the integrating node of a TIA, while its 8 MHz gain bandwidth product supports closed-loop bandwidths in the 100 kHz to 1 MHz range for moderate-feedback resistances (100 kohm to 1 Mohm). The rail-to-rail output stage preserves dynamic range when the photodiode is biased near ground and the supply is a single 5 V rail. Place the part close to the photodiode, use a low-leakage PTFE or COG feedback capacitor, and bypass V+ with a 100 nF X7R plus 10 uF bulk cap to suppress load-step ringing on the output.
Recommended
High-Side Current Sense Amplifier
For high-side current sensing across a shunt resistor in a 24 V industrial bus, the ADA4622-1 supplies the precision gain stage with 30 V single-supply operation that survives common-mode transients above the rail. Its 8 MHz GBW handles PWM-edge transients up to ~100 kHz without slew-induced distortion, and its 6 pA bias keeps the input stage from injecting offset into the sense amplifier. Configure as a difference amplifier with four 0.1% thin-film resistors, or use the ADI AD8217/AD8218 if fixed-gain isolation is preferred.
Recommended
16/18-Bit SAR ADC Driver
The ADA4622-1 functions as a precision buffer or active filter ahead of 16-/18-bit successive-approximation ADCs such as the AD7606C or AD7980. Its rail-to-rail output swing lets a single 5 V supply drive the ADC input across its full-scale range without distortion, while the 8 MHz GBW settles within 16-bit accuracy in a few hundred nanoseconds for typical RC source impedances. Insert a 2nd-order Sallen-Key anti-aliasing filter between the sensor and the ADC, with the ADA4622-1 providing the gain and the second pole.
Recommended
Precision Instrumentation Front End
In an instrumentation front end, the ADA4622-1 acts as the buffer after the instrumentation amplifier, providing gain to scale a +/-10 V sensor signal to a 0-5 V ADC input. The 120 dB open-loop gain minimizes gain error, while the 6 pA JFET bias prevents leakage from corrupting high-impedance sensor sources such as pH electrodes, strain gauges, or piezoelectric sensors. Pair with the AD8421 or AD8422 instrumentation amplifier for the input stage.
Recommended
Active Filter (Sallen-Key / Multiple-Feedback)
Use the ADA4622-1 as the active element in a Sallen-Key low-pass or multiple-feedback band-pass filter. The 8 MHz GBW supports filter cutoff frequencies up to ~200 kHz with 1 MHz sampling, while the unity-gain-stable topology and rail-to-rail output accommodate single-supply 5 V or 30 V operation. Use 0.1% metal-film resistors and C0G/NP0 capacitors for filter accuracy; avoid ceramic X7R for filter capacitors in precision filters above 50 kHz.
Recommended
Medical Instrumentation Signal Path
In ECG, EEG, or pulse-oximeter analog signal chains, the ADA4622-1 buffers and filters biopotential signals with 6 pA input bias current that does not polarize skin electrodes. The 120 dB open-loop gain and 0.0007% THD preserve signal integrity for diagnostic-grade front ends, while the rail-to-rail output maximizes dynamic range on 3.3 V or 5 V single supplies typical of battery-powered medical devices. Pair with the AD8232 or ADAS1000 for complete biopotential front-end solutions.
Recommended
Industrial Process-Control Analog I/O
The ADA4622-1 drives 4-20 mA current-output DACs and reads 0-10 V process-control inputs in PLC analog I/O modules. Its 30 V single-supply operation accepts 24 V industrial-bus rails directly, while the JFET input tolerates the high-impedance resistor dividers used to scale field voltages down to ADC input range. The -40 C to +125 C extended industrial temperature range ensures reliable operation in unheated enclosures and outdoor cabinets.
Recommended
Recommended Products Summary
Engineering reference data for ADA4622-1ARJZ-R7 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ADA4622-1ARJZ-R2 | ADA4622-1ARJZ-RL | OPA2188BIDR | OPA172IDR |
|---|---|---|---|---|---|
| Package | SOT-23-5 (RJ) | SOT-23-5 (RJ) - same | SOT-23-5 (RJ) - same | SOT-23-5 (DBV) - same | SOT-23-5 (DBV) - same |
| Brand | Analog Devices | Analog Devices - same | Analog Devices - same | Texas Instruments - different | Texas Instruments - different |
| Gain Bandwidth Product | 8 MHz | 8 MHz | 8 MHz | 2 MHz | 10 MHz |
| Input Bias Current (typical) | 6 pA | 6 pA | 6 pA | 5 pA | 8 pA |
| Supply Voltage Range (single) | 5 V to 30 V | 5 V to 30 V | 5 V to 30 V | 4.5 V to 36 V | 4.5 V to 36 V |
| Output Type | Rail-to-Rail | Rail-to-Rail | Rail-to-Rail | Rail-to-Rail | Rail-to-Rail |
| Channels | 1 | 1 | 1 | 2 | 1 |
| Operating Temperature | -40 C to +125 C | -40 C to +125 C | -40 C to +125 C | -40 C to +125 C | -40 C to +125 C |
| Qty-1 Unit Price (USD) | $7.68 | approx $6.50 | approx $6.20 | approx $3.20 | approx $1.95 |
Key Differentiators
- 8 MHz GBW with rail-to-rail output on 30 V single supply (vs OPA2188BIDR)
- JFET input with 6 pA bias for high-impedance sensor front ends (vs AD8628ARTZ-REEL2)
- 30 V single-supply with rail-to-rail output (vs OPA172IDR)
Design Notes
Decouple each supply pin (V+ and V-) with a 100 nF X7R ceramic capacitor placed within 5 mm of the IC pin, plus a bulk 10 uF tantalum or aluminum-polymer capacitor at the board supply entry. For dual-supply operation, symmetric decoupling on both rails prevents supply-pumping through the load. The ADA4622-1 draws ~1 mA quiescent current per channel, so a low-ESR bulk cap avoids rail droop on load steps. For sensitive photodiode front ends, a linear LDO such as the ADP7102 upstream of the ADA4622-1 further reduces supply noise.
In the SOT-23-5 footprint, keep input traces short and guarded to minimize leakage into the high-impedance JFET inputs. Use a driven guard ring around IN+ and IN- tied to a low-impedance node at the same potential as the inputs; this steals leakage from the PCB substrate and from surface contamination. Place feedback components close to the inverting input to minimize parasitic capacitance, which would otherwise create an unintended pole in transimpedance or photodiode circuits. Maintain a continuous ground plane on layer 2 directly under the op amp input traces.
Do not confuse the ADA4622-1 SOT-23-5 pinout (pin 5 = IN-, no thermal pad) with the LFCSP-8 pinout (pin 5 = thermal pad, IN- on a different pin). Using the wrong footprint will short V- to the thermal pad. Also, the SOT-23-5 part does NOT have an exposed thermal pad - thermal dissipation is via the 5 signal leads only - so do not expect D2PAK-like thermal performance. Estimated: at 30 V single-supply with 5 V output and 10 mA load, power dissipation is approximately 250 mW; the SOT-23-5 theta_JA of ~200 C/W yields a 50 C temperature rise, well within the 125 C max.
For transimpedance amplifiers with feedback resistances above 100 kohm, add a feedback capacitor (Cf) in parallel with Rf to control the closed-loop response. The pole frequency is fp = 1 / (2 * pi * Rf * Cf); choose Cf so fp equals the geometric mean of the photodiode capacitance times the GBW (sqrt(GBW / (2*pi*Rf*Cd))). Too small a Cf causes peaking and instability; too large a Cf limits bandwidth unnecessarily. Verified: a 1 Mohm TIA with 10 pF photodiode capacitance requires roughly 1.5 pF of feedback capacitance for critical damping at 8 MHz GBW.
Compliance Information
RoHS and REACH compliant per Analog Devices product page. Not AEC-Q100 qualified - the ADA4622-1 is targeted at industrial precision analog, not automotive. Lead-free reflow-compatible per MSL1 rating.
