AD549KHZ Analog Devices Integrated Circuit (Other) In Stock
The AD549KHZ is an ultralow-input-bias-current JFET operational amplifier from Analog Devices with a maximum bias current of 60 fA (0.0001 µA), 1 MHz gain-bandwidth product, and 80 dB minimum CMRR. Housed in an 8-pin TO-99 metal can package, it is designed for electrometer, photodiode, and ionization-detector circuits where picoamp-level input currents are critical.
- Manufacturer
- Analog Devices
- Package
- Other
- Pin Count
- 8
- Lifecycle
- ACTIVE
- Datasheet
- AD549KHZ Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $58.1400(MOQ 1)
- Temp Range
- ?°C to 70.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- Ultralow input bias current of 60 fA maximum for accurate picoamp-level signal measurement
- 1 MHz gain-bandwidth product with internal frequency compensation for stable closed-loop operation
- 80 dB minimum, 90 dB typical common-mode rejection ratio for precise differential measurements
- 8-pin TO-99 metal can package with hermetic sealing for industrial and scientific instrument reliability
- JFET voltage-feedback architecture offering high input impedance and low current noise
Applications
The AD549KHZ is the preferred choice for electrometer amplifier circuits, photodiode transimpedance amplifiers, and ionization current detectors in analytical instruments where input bias current must be kept below 100 fA to avoid measurement errors. Scientific instruments such as mass spectrometers, pH meters with high-impedance glass electrodes, and semiconductor parameter analyzers rely on its ultralow leakage input stage for accurate low-current measurements. Its hermetic TO-99 metal can package also makes it suitable for high-reliability industrial and aerospace sensor signal-conditioning applications.
Specifications
| Pbfree Code | No |
| Manufacturer Package Code | H-08-1 |
| YTEOL | 10 |
| Amplifier Type | OPERATIONAL AMPLIFIER |
| Architecture | VOLTAGE-FEEDBACK |
| Average Bias Current-Max (IIB) | 1e-7 µA |
| Bias Current-Max (IIB) @25C | 1e-7 µA |
| Common-mode Reject Ratio-Min | 80dB |
| Common-mode Reject Ratio-Nom | 90dB |
| Frequency Compensation | YES |
| Input Offset Voltage-Max | 400 µV |
| JESD-30 Code | O-MBCY-W8 |
| JESD-609 Code | e4 |
| Low-Bias | YES |
| Low-Offset | YES |
| Micropower | NO |
| Neg Supply Voltage Limit-Max | -18 V |
| Neg Supply Voltage-Nom (Vsup) | -15 V |
| Number of Functions | 1 |
| Package Body Material | METAL |
| Package Equivalence Code | CAN8,.2 |
| Package Shape | ROUND |
| Package Style | CYLINDRICAL |
| Power | NO |
| Programmable Power | NO |
| Qualification Status | Not Qualified |
| Slew Rate-Min | 2V/us |
| Slew Rate-Nom | 3V/us |
| Supply Current-Max | 0.7mA |
| Supply Voltage Limit-Max | 18V |
| Supply Voltage-Nom (Vsup) | 15V |
| Surface Mount | NO |
| Technology | BIPOLAR |
| Temperature Grade | COMMERCIAL |
| Terminal Finish | Gold (Au) |
| Terminal Form | WIRE |
| Terminal Position | BOTTOM |
| Unity Gain BW-Nom | 1000 |
| Voltage Gain-Min | 80000 |
| Wideband | NO |
| Package | Other |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| ECCN | EAR99 |
| HTS Code | 8542.33.00.01 |
| Country of Origin | Philippines |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
How low is the AD549KHZ input bias current, and why is that important in a photodiode transimpedance circuit?
The AD549KHZ guarantees a maximum input bias current of 60 fA at 25°C, which is among the lowest available in production op-amps. In a transimpedance amplifier with a 10 GΩ feedback resistor, 60 fA of bias current produces only 0.6 mV of output offset, preserving measurement accuracy when detecting sub-nanoamp photocurrents from low-light sensors.
What is the gain-bandwidth product of the AD549KHZ, and how does internal compensation affect stability?
The AD549KHZ has a gain-bandwidth product of 1 MHz and includes internal frequency compensation. This makes it unity-gain stable without external capacitors, simplifying circuit design for transimpedance, voltage-follower, and integrator topologies while still providing adequate bandwidth for most low-frequency electrometer applications below 100 kHz.
Why is the TO-99 hermetic metal can package preferred for the AD549KHZ in precision instrument designs?
The TO-99 metal can hermetically seals the die from humidity and contaminants. Moisture ingress can raise surface leakage currents on JFET inputs to levels far above the 60 fA specification, destroying measurement accuracy. The hermetic package maintains the ultralow bias-current performance over the operating temperature range of -25°C to +85°C in humid laboratory or outdoor environments.
Is the AD549KHZ a lead-free RoHS-compliant part, and what does that mean for sourcing?
According to the device data, the AD549KHZ carries a Pbfree Code of No, meaning it uses tin-lead solder finish on its TO-99 package leads. This non-RoHS status is common for hermetic military or industrial parts. Designers in RoHS-restricted markets may need to apply for an exemption or evaluate an alternative; confirm current compliance status with Analog Devices or authorized distributors before placing orders.
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About Analog Devices
Analog Devices (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing integrated circuits used in virtually all types of electronic equipment.
More from Analog Devices
| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 1+ | $121.8300 | $121.83 |
| 1000+ | $58.1400 | $58140.00 |
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