ADA4530-1ARMZ - Femtoampere Bias Current Op Amp | Analog Devices
MPN: ADA4530-1ARMZ ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $18.91 | $18.91 |
| 10 | $17.82 | $178.20 |
| 100 | $15.5 | $1,550.00 |
| 500 | $13.2 | $6,600.00 |
| 1,000 | $11.9 | $11,900.00 |
Drop-in alternatives for ADA4530-1ARMZ — 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:
ADA4530-1ARMZ-R7
✅ Drop-In📋 Reference alternative (not in catalog)
ADA4530-1ARMZ Maximum Ratings & Electrical Characteristics
| Amplifier Type | Electrometer (General Purpose) |
| Number of Circuits | 1 |
| Output Type | Rail-to-Rail |
| Slew Rate | 2.2 V/µs |
| Gain Bandwidth Product | 4 MHz |
| Input Bias Current (Max) | 20 fA at 25°C |
| Input Offset Voltage (Max) | 50 µV |
| Input Voltage Noise Density | 12 nV/√Hz at 1 kHz |
| Supply Voltage - Single | 4.5 V to 16 V |
| Supply Voltage - Dual | ±2.25 V to ±8 V |
| Supply Current (Typ) | 0.9 mA |
| Operating Temperature Range | -40°C to +125°C |
| Package | 8-Lead MSOP (ARMZ) |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
ADA4530-1ARMZ Pin Configuration
| Pin 1 | OUT — Output |
| Pin 2 | V- — Negative supply |
| Pin 3 | +IN — Non-inverting input |
| Pin 4 | -IN — Inverting input |
| Pin 5 | GUARD — Guard buffer output |
| Pin 6 | V+ — Positive supply |
| Pin 7 | NC — No connect |
| Pin 8 | NC — No connect |
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
ADA4530-1ARMZ is suitable for 6 applications: Photodiode Amplifier, Ion Sensor Interface, pH Meter, Mass Spectrometry, Chromatography, High-Impedance Sensor Buffer.
Photodiode Amplifier
The ADA4530-1ARMZ's 20 fA input bias current and low noise make it ideal for photodiode amplification. It converts the small photocurrent into a voltage with minimal error, enabling accurate light measurement in applications such as spectroscopy and fiber optic monitoring. The internal guard buffer helps reduce leakage currents, ensuring femtoampere-level accuracy.
Recommended
Ion Sensor Interface
In ion sensors, the ADA4530-1ARMZ amplifies the tiny currents generated by ion-selective electrodes. Its ultra-low bias current prevents loading of the high-impedance sensor, while its rail-to-rail output maximizes dynamic range. The device's low offset voltage ensures accurate measurement of ion concentrations in chemical analysis and environmental monitoring.
Recommended
pH Meter
The ADA4530-1ARMZ is used in pH meters to amplify the high-impedance signal from a pH electrode. Its 20 fA bias current minimizes measurement error, and its low noise ensures stable readings. The device operates from a single 5V supply, making it suitable for portable pH meters. The internal guard buffer simplifies PCB layout for leakage reduction.
Recommended
Mass Spectrometry
In mass spectrometry, the ADA4530-1ARMZ amplifies the tiny ion currents detected by the instrument. Its femtoampere bias current and low noise are critical for detecting low-abundance ions. The device's wide supply voltage range allows integration into various spectrometer designs. The guard buffer helps maintain accuracy in high-impedance environments.
Recommended
Chromatography
The ADA4530-1ARMZ is used in chromatography detectors to amplify the small currents from electrochemical or conductivity detectors. Its low bias current and low offset voltage ensure accurate quantification of analytes. The device's rail-to-rail output allows direct interface to ADCs. The internal guard buffer reduces leakage, improving detection limits.
Recommended
High-Impedance Sensor Buffer
The ADA4530-1ARMZ serves as a buffer for high-impedance sensors such as piezoelectric or capacitive sensors. Its 20 fA bias current prevents loading, and its low noise preserves signal integrity. The device's wide bandwidth of 4 MHz supports dynamic signals. The guard buffer simplifies PCB design for leakage minimization.
Recommended
Recommended Products Summary
Engineering reference data for ADA4530-1ARMZ — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ADA4530-1ARZ | ADA4530-1ARMZ-R7 | OPA928 |
|---|---|---|---|---|
| Package | 8-Lead MSOP | 8-Lead SOIC | 8-Lead MSOP | 8-Lead SOIC |
| Brand | Analog Devices | Analog Devices | Analog Devices | Texas Instruments |
| Input Bias Current (Max) | 20 fA | 20 fA | 20 fA | 20 fA |
| Gain Bandwidth Product | 4 MHz | 4 MHz | 4 MHz | 0.7 MHz |
| Supply Voltage Range | 4.5V to 16V | 4.5V to 16V | 4.5V to 16V | 4.5V to 16V |
| Input Offset Voltage (Max) | 50 µV | 50 µV | 50 µV | 50 µV |
| Slew Rate | 2.2 V/µs | 2.2 V/µs | 2.2 V/µs | 0.4 V/µs |
| Price (1pc) | $18.91 | $18.91 | $18.91 | $15.00 |
Key Differentiators
- Ultra-low input bias current of 20 fA (vs OPA928)
- Internal guard buffer (vs LMP7721)
- Wide supply voltage range up to 16V (vs OPA928)
Design Notes
To achieve femtoampere bias current, use guard rings around the input pins. Connect the guard ring to the GUARD pin (pin 5) to drive the ring at the same potential as the inputs, minimizing leakage. Use high-quality insulating materials and clean the PCB thoroughly to remove flux residues.
Keep the input traces as short as possible and shield them from noise sources. The unique pinout of the ADA4530-1 is optimized to prevent coupling between sensitive inputs and power/output pins. Follow the layout recommendations in the AN-1373 Application Note for best performance.
Use low-noise power supplies and bypass each supply pin with a 0.1 µF ceramic capacitor close to the device. For dual-supply operation, ensure proper decoupling of both V+ and V- pins. The supply current is typically 0.9 mA, so power dissipation is minimal.
Compliance Information
RoHS compliant per Analog Devices product page. AEC-Q100 not applicable for this non-automotive part.
