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Analog Devices Inc. AD8625AR-REEL
- Part No.:
- AD8625AR-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD8625AR-REEL.pdf
- Description:
- IC OPAMP JFET 4 CIRCUIT 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,742
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Product details
Overview
AD8625AR-REEL from Analog Devices is a precision quad JFET-input operational amplifier optimized for low-power, single-supply operation (5 V to 26 V) and rail-to-rail output swing. It delivers 5 MHz gain bandwidth, 5 V/µs slew rate, <1 pA input bias current, 500 µV max offset voltage, and operates across −40°C to +85°C - enabling high-accuracy photodiode transimpedance amplification and battery-powered instrumentation.
For engineers reviewing the AD8625AR-REEL datasheet, AD8625AR-REEL pinout, AD8625AR-REEL application, or AD8625AR-REEL equivalent, key selection criteria include verified picoamp-level input bias stability over temperature, rail-to-rail output capability under 2 mA load, unity-gain stability with >500 pF capacitive drive, and confirmed 14-pin TSSOP (RU) package compatibility in production designs.
Technical Context
The AD8625AR-REEL implements a true JFET-input stage with n-channel devices, enabling input common-mode range extending 0.2 V below V− and up to 2 V below V+, while maintaining sub-picoamp bias current at 25°C. Its bipolar rail-to-rail output stage achieves ≤5 mV saturation voltage at ±2 mA load.
It features no phase reversal under overdrive, supports stable closed-loop operation at gains ≥1 with ≥60° phase margin, and maintains 104 dB PSRR and 87 dB CMRR at DC - critical for precision sensor signal conditioning in noisy industrial environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Bandwidth Product | 5 MHz - enables stable unity-gain buffer configurations for DAC output amplification up to ~100 kHz full-power bandwidth. |
| Slew Rate | 5 V/µs - supports fast settling of step inputs in precision data acquisition without distortion. |
| Input Bias Current | 1 pA max at 25°C - minimizes DC error in high-impedance photodiode and filter applications with Rf ≥ 1 MΩ. |
| Offset Voltage | 500 µV max - ensures ≤0.01% gain error in 14-bit DAC I/V conversion with 5 V reference. |
| Rail-to-Rail Output | Swings within 5 mV of rails at ±2 mA - maximizes dynamic range in 5 V single-supply systems without negative rail. |
| Supply Current per Amp | 630 µA typ - allows four-channel operation at <2.6 mA total, suitable for portable instrumentation with tight power budgets. |
| Operating Temperature | −40°C to +85°C - qualified for automotive sensor interfaces and industrial control modules. |
Pinout & Package
AD8625AR-REEL is packaged in a 14-lead TSSOP (RU suffix), 5.0 mm × 4.4 mm body, 0.65 mm pitch, with exposed pad for thermal enhancement. Pin 1 is marked via dot or bevel.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT D | Amplifier D output - drives external load; rail-to-rail capable, stable with ≥500 pF capacitance. |
| 2 | –IN D | Inverting input for Amp D - high-impedance JFET node; guard trace required for pA-level signal integrity. |
| 3 | +IN D | Non-inverting input for Amp D - accepts signals down to 0.2 V below V−; avoid >2 V below V+ to prevent bandwidth loss. |
| 4 | V− | Negative supply rail - connects to ground or negative rail; all amps share this terminal. |
| 5 | +IN C | Non-inverting input for Amp C - electrically isolated from other inputs; used in multi-channel filtering. |
| 6 | –IN C | Inverting input for Amp C - matched to Pin 2 for channel-to-channel tracking in differential stages. |
| 7 | OUT C | Amplifier C output - identical performance to Pin 1; supports independent signal paths in 4-pole Sallen-Key filters. |
| 8 | V+ | Positive supply rail - accepts 5 V to 26 V; decoupling capacitor required within 1 cm. |
| 9 | –IN B | Inverting input for Amp B - referenced to same V−/V+ as all channels; layout symmetry critical for CMRR. |
| 10 | +IN B | Non-inverting input for Amp B - supports single-ended or differential input configurations. |
| 11 | OUT B | Amplifier B output - drives second independent channel; shares thermal path with Pins 1 and 7. |
| 12 | +IN A | Non-inverting input for Amp A - primary channel for precision buffering; lowest noise coupling when placed nearest V+. |
| 13 | –IN A | Inverting input for Amp A - matched to Pin 12; used in transimpedance feedback loops with low-leakage PCB design. |
| 14 | OUT A | Amplifier A output - designated main channel in datasheet figures; validated for photodiode preamp and DAC output stages. |
Key Features
| Feature | Design Value |
|---|---|
| No phase reversal | Guaranteed under input overdrive beyond rails - eliminates output polarity inversion in sensor fault conditions. |
| Unity-gain stable | Operates without external compensation at G = 1 - simplifies design of precision buffers for ASIC and CMOS DAC outputs. |
| Capacitive load drive | Stable with >500 pF on any output - enables direct connection to ADC input caps or long cables without isolation resistors. |
| Low 0.1–10 Hz noise | 1.9 µV p-p - preserves signal integrity in DC-coupled strain gauge and thermopile amplifiers. |
| High channel separation | 104 dB at 1 kHz - prevents crosstalk between independent signal chains in multi-sensor front-ends. |
Applications
| Photodiode Signal Conditioning | Line-Powered Instrumentation |
|---|---|
Use Scenario: Amplifying nanoamp-level photocurrent from silicon PIN photodiodes in optical smoke detectors and spectrophotometers. IC Role / Device Role / Timing Role: Transimpedance amplifier (TIA) with 1.5 MΩ feedback resistor; converts current to voltage with minimal input bias-induced offset. Use Value: 1 pA input bias ensures <0.75 µV output error at 1.5 MΩ, enabling detection of sub-nW light levels without trimming. | Use Scenario: Buffering 14-bit DAC outputs in programmable logic controller (PLC) analog output modules. IC Role / Device Role / Timing Role: Rail-to-rail output amplifier driving 600 Ω loads; provides full 0–5 V span from unipolar DACs. Use Value: 500 µV max offset contributes <0.01% FSR error, eliminating need for factory calibration in industrial field devices. |
| Automotive Sensor Interface | Precision Low-Frequency Filtering |
Use Scenario: Signal conditioning for exhaust gas oxygen (EGO) sensors and MEMS pressure transducers in engine control units. IC Role / Device Role / Timing Role: Single-supply amplifier accepting inputs down to 0.2 V below ground; rejects battery ripple via 104 dB PSRR. Use Value: Input voltage range from –0.2 V to +3 V at 5 V supply enables direct interface to ratiometric sensors without level-shifting. | Use Scenario: Implementing 10 Hz, 8-pole Sallen-Key anti-aliasing filters in seismic data loggers and medical ECG front-ends. IC Role / Device Role / Timing Role: Quad op-amp configured as cascaded 2-pole sections; leverages ultra-low IB to use MΩ-range resistors. Use Value: Picoamp input bias avoids DC drift in high-R filter networks, maintaining <0.1% passband flatness over 10-year deployment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision JFET op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD8626ARMZ-REEL | Dual-channel MSOP-8; 710 µA/amp supply current; same 1 pA IB and 500 µV VOS. | Lacks two amplifier channels; smaller footprint but requires two ICs for quad functionality. | Select when board space is constrained and only two precision channels are needed. |
| OPA211IDR | Bipolar input; 3.6 nV/√Hz voltage noise vs. AD8625's 17.5 nV/√Hz; 1.8 pA IB at 25°C. | Higher speed (45 MHz GBW) but higher input current limits photodiode use above 100 kΩ Rf. | Select for wideband precision applications where low voltage noise dominates over input current. |
Compared with AD8626ARMZ-REEL, AD8625AR-REEL provides two additional amplifiers in one RU-package, reducing component count in multi-channel systems; versus OPA211IDR, it trades bandwidth for lower input bias and superior DC precision in high-impedance sensor interfaces.
Availability
AD8625AR-REEL is available at Aetrix Electronics and suitable for photodiode amplifiers, line-powered instrumentation, and automotive sensor interfaces requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AD8625AR-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 AD862x family was designed specifically for precision, low-power, single-supply signal conditioning in battery-operated and industrial measurement systems where picoamp input bias and rail-to-rail output are mandatory.
FAQ
What is the maximum capacitive load the AD8625AR-REEL can drive while remaining stable?
The AD8625AR-REEL is specified to remain stable with capacitive loads exceeding 500 pF on any output, as confirmed in the datasheet's Typical Performance Characteristics (Figure 31). This allows direct interfacing to ADC input capacitors, long cables, or piezoelectric sensors without requiring isolation resistors or external compensation networks - a key advantage over many legacy JFET op-amps that oscillate above 100 pF.
Does the AD8625AR-REEL support true rail-to-rail input operation?
The AD8625AR-REEL does not support rail-to-rail input: its input common-mode range extends from 0.2 V below V− to 2 V below V+. At 5 V supply, this means usable input range is 0 V to +3 V. Driving the input within 2 V of V+ causes increased common-mode error and bandwidth reduction, as shown in Figure 15 of the AD8625/AD8626/AD8627 datasheet Rev. F - so full rail-to-rail input is not supported, though rail-to-rail output is guaranteed.
What is the thermal resistance (θJA) of the AD8625AR-REEL in its 14-lead TSSOP package?
The AD8625AR-REEL in 14-lead TSSOP (RU suffix) has a junction-to-ambient thermal resistance (θJA) of 180°C/W, as specified in Table 4 of the AD8625/AD8626/AD8627 Rev. F datasheet. This value assumes standard JEDEC 2-layer board conditions; actual thermal performance improves with copper pour and thermal vias under the exposed pad.
Can the AD8625AR-REEL be used in photovoltaic mode photodiode circuits without significant DC error?
Yes - the AD8625AR-REEL is explicitly validated for photovoltaic-mode photodiode preamplifiers, as detailed in the "Photodiode Preamplifier Application" section (Page 15) of its datasheet. With 1 pA max input bias current and 500 µV max offset voltage, it introduces negligible DC error even with 1.5 MΩ feedback resistors, achieving >95 dB SNR at 30 kHz bandwidth in typical configurations.
Is the AD8625AR-REEL pin-compatible with other members of the AD862x family?
No - the AD8625AR-REEL (14-pin TSSOP) is not pin-compatible with AD8626 (8-pin SOIC/MSOP) or AD8627 (5-pin SC70/8-pin SOIC). Each variant has distinct pin counts, layouts, and channel counts: AD8625 is quad, AD8626 is dual, AD8627 is single. Interchangeability requires PCB redesign; only functional equivalence is supported across the family.
AD8625AR-REEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Amplifier Type:
- J-FET
- Number of Circuits:
- 4
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 5V/µs
- Gain Bandwidth Product:
- 5 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 0.25 pA
- Voltage - Input Offset:
- 350 µV
- Current - Supply:
- 710µA (x4 Channels)
- Current - Output / Channel:
- 15 mA
- Voltage - Supply Span (Min):
- 5 V
- Voltage - Supply Span (Max):
- 26 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SOIC
AD8625AR-REEL FAQ
1.How can I place an order for AD8625AR-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD8625AR-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 AD8625AR-REEL reliable?
The price and inventory of AD8625AR-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD8625AR-REEL is usually 5 days.
3.What payment methods are accepted for AD8625AR-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD8625AR-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD8625AR-REEL?
AD8625AR-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD8625AR-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 AD8625AR-REEL?
For technical support, including AD8625AR-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD8625AR-REEL requirements.
6.How does Aetrix verify that AD8625AR-REEL is sourced from the original manufacturer or authorized distributors?
All AD8625AR-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 AD8625AR-REEL meets industry standards.
7.What is the process for return or replacement of AD8625AR-REEL?
All AD8625AR-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD8625AR-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 AD8625AR-REEL part is unused and in its original packaging.
Return procedure for AD8625AR-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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