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Analog Devices Inc. AD795JRZ
- Part No.:
- AD795JRZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD795JRZ.pdf
- Description:
- IC OPAMP JFET 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,068
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Product details
Overview
AD795JRZ from Analog Devices is a low-noise, precision FET-input operational amplifier designed for high-impedance signal conditioning. It delivers 2 pA maximum input bias current, 500 μV maximum input offset voltage, and 3.3 μV p-p (0.1 Hz to 10 Hz) input voltage noise-enabling accurate photodiode preamplification in CT scanners and precision current-to-voltage conversion.
For engineers reviewing the AD795JRZ datasheet, AD795JRZ pinout, AD795JRZ application, or AD795JRZ equivalent, this page provides verified specifications, SOIC-8 pin mapping, real-world photodiode and medical imaging use cases, and two validated alternative op amps with documented parameter-level differences.
Technical Context
The AD795JRZ employs a JFET-input stage to achieve ultra-low input bias current while maintaining bipolar-like dc accuracy: 10 μV/°C max offset drift and 110 dB min open-loop gain. Its 10¹⁴ Ω common-mode input impedance ensures bias current stability across supply and common-mode voltage variations.
It features fully specified noise performance: guaranteed 3.3 μV p-p (0.1 Hz–10 Hz) and 11 nV/√Hz max at 10 kHz, plus 0.6 fA/√Hz current noise at 1 kHz. The device operates from ±4 V to ±18 V, with 1.5 mA max quiescent current and 1.6 MHz unity-gain bandwidth.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Bias Current | 2 pA max at +25°C - enables sub-picoampere resolution in photodiode and pH probe circuits |
| Input Offset Voltage | 500 μV max - supports precision l-to-V conversion without trimming in industrial sensor interfaces |
| Voltage Noise (0.1–10 Hz) | 3.3 μV p-p - critical for low-frequency biomedical signal acquisition with minimal flicker noise |
| Unity-Gain Bandwidth | 1.6 MHz - sufficient for stable closed-loop operation with 1 GΩ feedback resistors in photodiode preamps |
| Supply Current | 1.5 mA max - allows low-power operation in battery-backed medical instrumentation |
| Common-Mode Impedance | 10¹⁴ Ω || 2.2 pF - ensures bias current independence from rail voltage shifts in floating sensor front-ends |
| Input Voltage Range | ±10 V common-mode - compatible with ±15 V supplies while supporting wide-swing sensor outputs |
Pinout & Package
AD795JRZ is housed in an 8-lead SOIC (R) package with no internal connections on pins 1, 5, and 8. These pins may be tied to analog ground or driven guard traces to reduce leakage in high-impedance applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | No Connect | Internally unconnected; usable as guard trace connection point to minimize PCB leakage |
| 2 | Inverting Input (–IN) | High-impedance JFET node; requires guarding and clean layout to preserve ≤2 pA bias current |
| 3 | Noninverting Input (+IN) | High-impedance JFET node; primary input for follower configurations and reference buffering |
| 4 | Negative Supply (–VS) | Accepts –4 V to –18 V; must be decoupled with 0.1 µF ceramic capacitor near pin |
| 5 | No Connect | Internally unconnected; may be used for guard routing or left floating |
| 6 | Output | Capable of ±10 V swing into ≥2 kΩ load; slew rate limited to 1 V/µs for stability |
| 7 | Positive Supply (+VS) | Accepts +4 V to +18 V; requires local 0.1 µF ceramic decoupling |
| 8 | No Connect | Internally unconnected; recommended as guard tie-point in photodiode preamp layouts |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed low input voltage noise | 3.3 μV p-p (0.1–10 Hz) - enables high-resolution DC-coupled measurements in analytical instruments |
| FET-input architecture | 2 pA max input bias current - preserves signal integrity in >1 GΩ transimpedance stages |
| Stable dc accuracy | 10 μV/°C max offset drift - eliminates thermal calibration in portable diagnostic equipment |
| High common-mode impedance | 10¹⁴ Ω - maintains bias current stability despite ±15 V supply ripple or ground bounce |
| Low power consumption | 1.5 mA max supply current - supports multi-channel low-power sensor arrays in embedded systems |
Applications
| Photodiode Preamp | CT Scanner Signal Chain |
|---|---|
Use Scenario: Amplifying weak photocurrents from X-ray detection diodes in computed tomography systems. IC Role / Device Role / Timing Role: Transimpedance amplifier converting picoamp-level photodiode current to measurable voltage with minimal added noise. Use Value: 3.3 μV p-p low-frequency noise and 2 pA input bias current enable detection of low-dose X-ray signals without signal degradation. | Use Scenario: Conditioning analog signals from scintillation detectors before ADC sampling in medical imaging subsystems. IC Role / Device Role / Timing Role: Precision buffer and gain stage ensuring signal fidelity across temperature and supply variations during scan acquisition. Use Value: 10 μV/°C offset drift and 110 dB open-loop gain maintain linearity over 0°C to +70°C operating range required for clinical environments. |
| Precision l-to-V Converter | pH Probe Buffer |
Use Scenario: Converting output current from industrial process sensors (e.g., 4–20 mA loops) into calibrated voltage for PLC inputs. IC Role / Device Role / Timing Role: High-impedance current-sense amplifier with stable gain and low drift over time and temperature. Use Value: 500 μV max offset voltage and ±10 V common-mode range support accurate conversion without zero-adjust circuitry. | Use Scenario: Isolating and amplifying mV-level output from glass electrode pH probes in laboratory analyzers. IC Role / Device Role / Timing Role: Ultra-high-impedance buffer preventing loading of high-output-impedance electrochemical sensors. Use Value: 10¹⁴ Ω input impedance prevents measurement error caused by probe leakage, enabling <0.01 pH accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision FET op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA128SM | Lower input bias current (0.3 pA typ), higher cost, military-grade screening; 1.2 MHz GBW vs. AD795JRZ's 1.6 MHz | Better suited for ultra-high-impedance cryogenic or space-grade sensors where sub-picoamp bias is mandatory | Select OPA128SM only when bias current <0.5 pA is required and budget allows premium pricing |
| LTC1052CN8#PBF | Chopper-stabilized architecture; 0.5 μV max offset, but 10× higher 0.1–10 Hz noise (35 μV p-p) and 2.5 mA supply current | Preferred for zero-drift DC applications like strain gauge bridges, not low-noise AC-coupled photodiode paths | Choose LTC1052CN8#PBF when offset voltage dominates error budget and noise is secondary |
Compared with OPA128SM and LTC1052CN8#PBF, the AD795JRZ uniquely balances ultra-low bias current, low 0.1–10 Hz noise, and moderate power-making it optimal for photodiode preamps and medical CT front-ends where all three parameters constrain design.
Availability
AD795JRZ is available at Aetrix Electronics and suitable for photodiode preamplifiers, CT scanner analog signal chains, and precision current-to-voltage converters requiring stable component supply across long-lifecycle medical and industrial programs.
Supply support for AD795JRZ 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 AD795JRZ belongs to Analog Devices' precision FET op amp product line, engineered specifically for applications demanding ultra-low input bias current, low 1/f noise, and high dc accuracy in medical imaging, analytical instrumentation, and scientific measurement systems.
FAQ
What is the maximum input bias current specification for AD795JRZ at +25°C?
The AD795JRZ has a maximum input bias current of 2 pA at +25°C, as specified in Table 1 of the Rev. D datasheet under "INPUT BIAS CURRENT" with test condition VCM = 0 V. This value is guaranteed after 5 minutes of operation and reflects the device's JFET-input architecture optimized for high-impedance sensor interfacing. The AD795JRZ maintains this performance across its commercial temperature range.
Does AD795JRZ support dual-supply operation, and what is its rated supply range?
Yes, AD795JRZ supports dual-supply operation with a rated performance range of ±15 V and an extended operating range of ±4 V to ±18 V. The datasheet specifies all key parameters-including input offset voltage, noise, and open-loop gain-at ±15 V, and confirms functionality across the full ±4 V to ±18 V span. Quiescent current remains within 1.5 mA max across this range, making AD795JRZ suitable for flexible power system designs.
Can AD795JRZ be used in photodiode preamplifier circuits, and what design considerations apply?
Yes, AD795JRZ is explicitly recommended for photodiode preamplifiers, as confirmed in the Applications section and Figure 45 of the datasheet. Critical design considerations include guarding pins 1, 5, and 8; using Teflon standoffs for input traces; selecting low-leakage capacitors; and limiting input protection resistors to avoid Johnson noise degradation. The AD795JRZ's 2 pA bias current and 3.3 μV p-p noise directly enable high-gain, low-error transimpedance stages up to 1 GΩ.
What is the guaranteed input voltage noise performance of AD795JRZ in the 0.1 Hz to 10 Hz band?
The AD795JRZ guarantees a maximum input voltage noise of 3.3 μV p-p in the 0.1 Hz to 10 Hz band, as stated in both the Features list and Table 1 of the Rev. D datasheet. This low 1/f noise is measured and tested per unit, and is a key differentiator for DC and low-frequency precision applications such as pH sensing and thermopile amplification. Typical performance is 1.0 μV p-p, but design margins must use the 3.3 μV p-p max value.
Is AD795JRZ pin-compatible with other op amps like OPA111 or OPA121?
No, AD795JRZ is not pin-compatible with OPA111 or OPA121. While the datasheet states it is a "low power replacement" for those Burr-Brown devices in terms of function and performance class, the AD795JRZ uses an 8-lead SOIC package with NC pins at positions 1, 5, and 8-whereas OPA111 (DIP-8) and OPA121 (SO-8) have different pinouts and internal connections. System redesign is required when substituting AD795JRZ for either part.
AD795JRZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- J-FET
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 1V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 1.6 MHz
- Current - Input Bias:
- 1 pA
- Voltage - Input Offset:
- 100 µV
- Current - Supply:
- 1.3mA
- Current - Output / Channel:
- 10 mA
- Voltage - Supply Span (Min):
- 8 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
AD795JRZ FAQ
1.How can I place an order for AD795JRZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD795JRZ 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 AD795JRZ reliable?
The price and inventory of AD795JRZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD795JRZ is usually 5 days.
3.What payment methods are accepted for AD795JRZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD795JRZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD795JRZ?
AD795JRZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD795JRZ 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 AD795JRZ?
For technical support, including AD795JRZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD795JRZ requirements.
6.How does Aetrix verify that AD795JRZ is sourced from the original manufacturer or authorized distributors?
All AD795JRZ 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 AD795JRZ meets industry standards.
7.What is the process for return or replacement of AD795JRZ?
All AD795JRZ units undergo pre-shipment inspection (PSI). If there is an issue with AD795JRZ, 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 AD795JRZ part is unused and in its original packaging.
Return procedure for AD795JRZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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