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Analog Devices Inc. AD745JR-16-REEL
- Part No.:
- AD745JR-16-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
AD745JR-16-REEL.pdf
- Description:
- IC OPAMP BIFET 20MHZ ULN 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:5,751
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Product details
Overview
AD745JR-16-REEL from Analog Devices is an ultralow-noise, high-speed, FET-input operational amplifier optimized for gains ≥ +5 (or –4). It delivers 2.9 nV/√Hz input voltage noise at 10 kHz, 12.5 V/µs slew rate, and 20 MHz gain bandwidth product, with 0.5 mV max input offset voltage and 250 pA max input bias current. It is used in photodiode amplifiers, sonar preamplifiers, and precision accelerometer signal conditioning.
For engineers reviewing the AD745JR-16-REEL datasheet, AD745JR-16-REEL pinout, AD745JR-16-REEL application, or AD745JR-16-REEL equivalent, key selection criteria include low-frequency voltage noise (0.38 µV p-p, 0.1–10 Hz), current noise (6.9 fA/√Hz @ 1 kHz), output phase reversal immunity, and internal compensation for stable high-gain operation.
Technical Context
The AD745JR-16-REEL employs a JFET input stage to achieve ultralow input bias current while maintaining bipolar-class voltage noise performance. Its internal compensation is tailored for closed-loop gains of +5 or greater, enabling 20 MHz bandwidth and 12.5 V/µs slew rate-unlike unity-gain-stable op amps.
It features no output phase reversal when the negative common-mode input limit (–10.7 V) is exceeded, a critical reliability trait in sensor front-ends. The device operates from ±4.8 V to ±18 V supplies, with quiescent current of 8–10 mA and open-loop gain ≥2000 V/mV into 2 kΩ load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Noise | 2.9 nV/√Hz @ 10 kHz - enables low-noise amplification of weak signals above audio band |
| Input Current Noise | 6.9 fA/√Hz @ 1 kHz - minimizes total noise contribution at high source impedances |
| Slew Rate | 12.5 V/µs - supports fast transient response in high-gain, wideband preamplifier stages |
| Gain Bandwidth Product | 20 MHz @ G = –4 - provides usable bandwidth even at high closed-loop gains |
| Input Offset Voltage | 0.5 mV max - ensures minimal DC error in precision transducer signal chains |
| Input Bias Current | 250 pA max @ 25°C - reduces voltage error across high-value feedback or source resistors |
| Common-Mode Range | +13.3 V / –10.7 V - accommodates rail-to-rail sensor outputs without clipping |
Pinout & Package
AD745JR-16-REEL is housed in a 16-lead SOIC (R) package (JEDEC MS-012, 7.6 mm × 10.0 mm body, 1.27 mm pitch), tape-and-reel compliant per EIA-481A.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Offset Null | Connects to external potentiometer for fine-tuning input offset voltage |
| 2 | Inverting Input (–) | Differential input node; high-impedance JFET gate connection |
| 3 | Noninverting Input (+) | Differential input node; matched impedance path for balanced noise rejection |
| 4 | –VS | Negative supply rail; must be decoupled locally to minimize PSRR degradation |
| 5 | Offset Null | Second terminal of offset null potentiometer; completes trimming circuit |
| 6 | Output | Class-A/B output stage; capable of ±13.6 V / ±12.6 V swing into 600 Ω |
| 7 | +VS | Positive supply rail; requires local 0.1 µF ceramic + 10 µF tantalum decoupling |
| 8 | NC | No connect; internal die pad not bonded; must remain floating |
| 9–16 | NC | All remaining pins are no-connect; unused bond pads; leave unconnected |
Key Features
| Feature | Design Value |
|---|---|
| No output phase reversal | Guaranteed immunity to polarity inversion when common-mode input exceeds –10.7 V, enhancing system robustness in sensor overrange conditions |
| Ultralow 0.1–10 Hz noise | 0.38 µV p-p - critical for DC-coupled, low-frequency instrumentation like accelerometers and hydrophones |
| High open-loop gain | ≥2000 V/mV @ ±15 V - ensures low closed-loop gain error and high loop gain for precision applications |
| Optimized high-gain stability | Internally compensated for G ≥ +5 - eliminates need for external compensation in most preamp configurations |
| ESD protection | Class 1 per MIL-STD-883C Method 3015.6 - withstands >2500 V on active pins, reducing handling risk |
Applications
| Photodiode Amplifier | Sonar Preamplifier |
|---|---|
Use Scenario: Amplifying low-level current from a reverse-biased silicon photodiode in spectroscopy or medical pulse oximetry systems. IC Role / Device Role / Timing Role: Transimpedance amplifier (TIA) with high-Z virtual ground input and low-noise voltage gain stage. Use Value: 6.9 fA/√Hz current noise and 2.9 nV/√Hz voltage noise minimize total input-referred noise, preserving SNR for sub-picoamp signals. | Use Scenario: Conditioning weak echo return signals from underwater acoustic transducers in naval sonar arrays. IC Role / Device Role / Timing Role: First-stage low-noise preamplifier with high common-mode rejection and no phase reversal under transducer overdrive. Use Value: +13.3 V / –10.7 V input common-mode range accommodates large transducer offsets; 20 MHz GBW supports broadband pulse detection. |
| Accelerometer Signal Chain | High-Fidelity Audio DAC Output Stage |
Use Scenario: Converting charge output from piezoelectric accelerometers (e.g., PCB 4370) into calibrated voltage signals for vibration monitoring. IC Role / Device Role / Timing Role: Charge amplifier with feedback capacitor (CF) defining sensitivity (e.g., 0.8 mV/pC), leveraging ultralow bias current to avoid drift. Use Value: 250 pA max input bias current prevents DC drift across high-value feedback networks; 0.38 µV p-p 0.1–10 Hz noise preserves low-frequency fidelity. | Use Scenario: I-V conversion stage following a 20-bit audio DAC (e.g., AD1862) in professional studio equipment. IC Role / Device Role / Timing Role: Low-noise, high-slew-rate current-to-voltage converter driving passive low-pass filter before analog output. Use Value: 12.5 V/µs slew rate prevents slew-induced distortion at 20 kHz; 0.0002% THD @ 1 kHz ensures audiophile-grade linearity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed, low-noise op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OP37GP | Higher input bias current (10 nA typ), higher voltage noise (3.5 nV/√Hz @ 10 kHz), unity-gain stable | Better suited for lower-impedance sources where current noise dominates; requires external compensation for G ≥ 5 | Select OP37GP only if unity-gain stability or faster settling at G = 1 is required; AD745JR-16-REEL preferred for high-Z sensors |
| AD829ARZ | Higher slew rate (200 V/µs), wider bandwidth (200 MHz), but higher voltage noise (1.7 nV/√Hz) and bias current (1.5 µA) | Targeted at video and fast pulse applications; less suitable for sub-nA current sensing or ultra-low-noise audio | Choose AD829ARZ for >100 MHz signal paths; AD745JR-16-REEL remains optimal for <50 MHz, high-impedance, low-noise precision roles |
Compared with OP37GP and AD829ARZ, AD745JR-16-REEL uniquely balances ultralow current noise (6.9 fA/√Hz), low voltage noise (2.9 nV/√Hz), and high-gain stability-making it irreplaceable in charge-amplifier and photodiode front-ends where both noise types constrain performance.
Availability
AD745JR-16-REEL is available at Aetrix Electronics and suitable for photodiode amplifiers, sonar preamplifiers, and accelerometer signal chains requiring stable component supply, long-term obsolescence management, and traceable sourcing.
Supply support for AD745JR-16-REEL 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 AD745JR-16-REEL belongs to Analog Devices' precision low-noise op amp family, designed specifically for demanding sensor interface applications where simultaneous low voltage noise, low current noise, and high-speed operation are essential.
FAQ
What is the operating temperature range for the AD745JR-16-REEL?
The AD745JR-16-REEL is rated for the commercial temperature range of 0°C to +70°C. This is specified in the Ordering Guide and confirmed in the Absolute Maximum Ratings table. It is not rated for extended industrial (–40°C to +85°C) or automotive temperature ranges. For designs requiring wider thermal operation, the AD745KR-16 variant shares identical electrical specs but is also limited to 0°C to +70°C.
Does the AD745JR-16-REEL require external compensation?
No, the AD745JR-16-REEL is internally compensated for stable operation at closed-loop gains of +5 (noninverting) or –4 (inverting) and greater. Attempting to use it at unity gain or G = 2 will result in instability and peaking. The datasheet explicitly states "Internally Compensated for Gains of +5 (or –4) or Greater" under FEATURES, and Figure 2 shows phase margin >45° only above ~5× gain.
What is the maximum supply voltage for the AD745JR-16-REEL?
The AD745JR-16-REEL has an absolute maximum supply voltage rating of ±18 V, as stated in the Absolute Maximum Ratings table. For reliable operation, the recommended supply range is ±4.8 V to ±18 V. Operation at ±18 V is permissible but increases quiescent current and junction temperature, which elevates input bias current-see TPC 4 and TPC 11 for derating guidance.
Is the AD745JR-16-REEL pin-compatible with other 16-lead SOIC op amps?
No, the AD745JR-16-REEL uses a proprietary 16-lead SOIC pinout with multiple no-connect (NC) pins (pins 8 and 9–16) and dual offset-null terminals (pins 1 and 5). It is not pin-compatible with standard dual or quad op amp SOIC packages (e.g., SOIC-8 or SOIC-14). Pin mapping must be verified against Figure 22a–22c and the Pinout & Package section-miswiring NC pins or offset-null connections will impair performance or cause malfunction.
How does the AD745JR-16-REEL handle overvoltage on its inputs?
The AD745JR-16-REEL guarantees no output phase reversal when the negative common-mode input voltage exceeds –10.7 V (down to –10 V absolute minimum), a key reliability feature for sensor interfaces subject to transients. However, differential input voltage must not exceed ±VS, and absolute input voltage must stay within ±VS-exceeding these violates Absolute Maximum Ratings and may cause permanent damage. External clamping is recommended for harsh environments.
AD745JR-16-REEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Amplifier Type:
- J-FET
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 12.5V/µs
- Gain Bandwidth Product:
- 20 MHz
- -3db Bandwidth:
- 20 MHz
- Current - Input Bias:
- 150 pA
- Voltage - Input Offset:
- 250 µV
- Current - Supply:
- 8mA
- Current - Output / Channel:
- 40 mA
- Voltage - Supply Span (Min):
- 9.6 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
AD745JR-16-REEL FAQ
1.How can I place an order for AD745JR-16-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD745JR-16-REEL 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 AD745JR-16-REEL reliable?
The price and inventory of AD745JR-16-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD745JR-16-REEL is usually 5 days.
3.What payment methods are accepted for AD745JR-16-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD745JR-16-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD745JR-16-REEL?
AD745JR-16-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD745JR-16-REEL 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 AD745JR-16-REEL?
For technical support, including AD745JR-16-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD745JR-16-REEL requirements.
6.How does Aetrix verify that AD745JR-16-REEL is sourced from the original manufacturer or authorized distributors?
All AD745JR-16-REEL 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 AD745JR-16-REEL meets industry standards.
7.What is the process for return or replacement of AD745JR-16-REEL?
All AD745JR-16-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD745JR-16-REEL, 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 AD745JR-16-REEL part is unused and in its original packaging.
Return procedure for AD745JR-16-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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