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Analog Devices Inc. AD8626ARM-R2
- Part No.:
- AD8626ARM-R2
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
AD8626ARM-R2.pdf
- Description:
- IC OPAMP JFET 5MHZ DUAL LP 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,395
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Product details
Overview
AD8626ARM-R2 from Analog Devices is a dual-channel, precision JFET-input operational amplifier in an 8-lead MSOP package. It delivers rail-to-rail output swing, 5 MHz gain bandwidth, ≤500 µV max offset voltage, and 1 pA max input bias current at 25°C - enabling high-accuracy signal conditioning in single-supply (5 V to 26 V) or dual-supply (±2.5 V to ±13 V) systems for photodiode preamplifiers and DAC output buffers.
For engineers reviewing the AD8626ARM-R2 datasheet, AD8626ARM-R2 pinout, AD8626ARM-R2 application, or AD8626ARM-R2 equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, application-specific implementation insights, and two confirmed alternative parts with documented functional and application-level differences.
Technical Context
The AD8626ARM-R2 uses n-channel JFET input transistors to achieve picoampere-level input bias current and low voltage noise (17.5 nV/√Hz at 1 kHz). Its bipolar rail-to-rail output stage delivers <5 mV dropout at ±2 mA load, supporting full dynamic range in single-supply instrumentation.
It features unity-gain stability, no phase reversal under rail-stressing inputs, and maintains CMRR >87 dB (typ) over 0–2.5 V common-mode range. The device is fully specified across −40°C to +85°C and supports capacitive loads up to 500 pF without oscillation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Bandwidth Product | 5 MHz - enables stable closed-loop operation up to 100 kHz full-power bandwidth with 20 VPP signals. |
| Input Bias Current | 1 pA max at 25°C - minimizes DC error in high-impedance photodiode or precision filter feedback networks. |
| Offset Voltage | 500 µV max - ensures ≤0.01% gain error in 14-bit DAC buffer applications with 5 V reference. |
| Rail-to-Rail Output | Swings within 5 mV of rails at ±2 mA - preserves >99.8% of supply voltage range for maximum ADC input utilization. |
| Supply Current per Amp | 630 µA typ - allows dual-channel operation at <1.3 mA total, critical for battery-powered line-powered instrumentation. |
| Input Voltage Range | 0 V to 3 V on 5 V supply - extends 0.2 V below negative rail, enabling true ground-sensing in single-supply sensor interfaces. |
| CMRR | 87 dB typ - rejects common-mode noise from shared power rails in multi-channel industrial control modules. |
Pinout & Package
AD8626ARM-R2 is housed in an 8-lead MSOP (RM suffix) package with 0.65 mm pitch, 3.0 mm × 3.0 mm footprint, and exposed pad for thermal enhancement (θJA = 210°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - V+ | Positive Supply Rail | Accepts 5 V to 26 V single supply or +2.5 V to +13 V dual supply; decoupling capacitor required within 1 cm. |
| 2 - –IN A | Inverting Input (Channel A) | High-impedance JFET node; guard ring routing recommended to maintain pA-level leakage performance. |
| 3 - +IN A | Noninverting Input (Channel A) | Common-mode range extends 0.2 V below V–; avoid driving >2 V below V+ to prevent bandwidth loss. |
| 4 - V– | Negative Supply Rail | Connect to ground (single-supply) or −2.5 V to −13 V (dual-supply); low-impedance return path essential. |
| 5 - OUT A | Output (Channel A) | Rail-to-rail capable; drives ≥10 kΩ loads directly; add series resistor if driving >500 pF capacitance. |
| 6 - OUT B | Output (Channel B) | Independent output; shares same supply pins; channel separation >104 dB at 1 kHz prevents crosstalk in dual-sensor systems. |
| 7 - +IN B | Noninverting Input (Channel B) | Electrically identical to Pin 3; supports independent dual-channel configuration without inter-channel coupling. |
| 8 - –IN B | Inverting Input (Channel B) | Matches Pin 2 performance; enables simultaneous differential sensing or dual-path filtering. |
Key Features
| Feature | Design Value |
|---|---|
| No phase reversal | Eliminates catastrophic output inversion when inputs exceed V+ - critical for automotive sensor front-ends with transient overvoltage. |
| 5 MHz bandwidth + 5 V/µs slew rate | Supports 50 kHz full-swing signals (20 VPP) with <0.1% settling error - suitable for fast DAC output buffering. |
| 1 pA input bias current | Reduces dark-current-induced error in photodiode preamps using >1 MΩ feedback resistors by >100× vs. bipolar op amps. |
| Rail-to-rail input & output | Enables direct interfacing with CMOS DACs and ASICs operating at 0–5 V logic levels without level-shifting circuitry. |
| −40°C to +85°C operation | Validated performance across industrial temperature range - no derating required for embedded control or remote sensor nodes. |
Applications
| Photodiode Preamplifier | Line-Powered Instrumentation |
|---|---|
Use Scenario: Amplifying nanoamp-level photocurrent from silicon photodiodes in optical smoke detectors and spectrophotometers. IC Role / Device Role / Timing Role: Transimpedance amplifier with 1.5 MΩ feedback resistor and 5 pF compensation capacitor. Use Value: 1 pA input bias current contributes <0.75 µV output error - negligible vs. 500 µV offset, enabling 95 dB SNR at 30 kHz bandwidth. |
Use Scenario: Signal conditioning front-end for 14-bit precision ADCs in portable multimeters and process analyzers. IC Role / Device Role / Timing Role: Single-supply buffer between sensor bridge and SAR ADC, rejecting common-mode noise from shared 5 V rail. Use Value: 87 dB CMRR suppresses >99.8% of 50 Hz mains interference, eliminating need for external notch filters. |
| DAC Output Buffer | Precision Low-Pass Filter |
Use Scenario: Driving unipolar 5 V output of AD5551/AD5552 DACs in automated test equipment (ATE) reference sources. IC Role / Device Role / Timing Role: Unity-gain voltage follower with 0.01% gain accuracy and <1 µs settling to 0.1%. Use Value: 5 MHz GBW and 5 V/µs slew rate preserve DAC settling time - avoids adding >100 ns delay to system timing budget. |
Use Scenario: Building 10 Hz, 8-pole Sallen-Key anti-aliasing filter for seismic data acquisition systems. IC Role / Device Role / Timing Role: Active filter stage using high-value resistors (up to 815 kΩ) and µF-range capacitors. Use Value: Picoampere input current prevents resistor-induced DC drift, maintaining filter cutoff stability over temperature and time. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel JFET-input op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA2140IDGKR | Lower input bias current (0.2 pA), higher GBP (11 MHz), but higher quiescent current (1.5 mA/amp). | Better for ultra-high-Z pH sensors; less suitable for battery-powered devices due to 2.3× higher supply current. | Select when sub-0.5 pA bias is mandatory and power budget allows >2× increase in IQ. |
| ADA4625-2ARMZ | Higher slew rate (35 V/µs), wider GBP (18 MHz), but larger offset (600 µV max) and no MSOP-8 option (only SOIC-8). | Preferred for fast-settling DAC buffers requiring <100 ns settling; not drop-in for space-constrained MSOP layouts. | Select when speed dominates accuracy, and PCB layout permits SOIC-8 footprint. |
Compared with OPA2140IDGKR and ADA4625-2ARMZ, AD8626ARM-R2 offers optimal balance of ultra-low input current, rail-to-rail output, compact MSOP-8 packaging, and sub-1.3 mA total supply current - making it the preferred choice for size- and power-sensitive dual-channel precision analog signal chains.
Availability
AD8626ARM-R2 is available at Aetrix Electronics and suitable for photodiode preamplifiers, line-powered instrumentation, and DAC output buffering requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for AD8626ARM-R2 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 instrumentation, sensor interfaces, and portable measurement systems - emphasizing picoampere input bias, rail-to-rail operation, and industrial temperature reliability.
FAQ
What is the maximum capacitive load the AD8626ARM-R2 can drive without instability?
The AD8626ARM-R2 remains stable with capacitive loads up to 500 pF when configured as a unity-gain buffer, as verified in Figure 31 and Figure 32 of the Rev. F datasheet. For loads exceeding 500 pF, a series resistor (≥10 Ω) between the output and capacitor restores phase margin. This capability eliminates the need for external isolation networks in photodiode transimpedance or DAC output stages where stray capacitance is unavoidable. AD8626ARM-R2's internal compensation ensures robustness without external components in most standard PCB layouts.
Does the AD8626ARM-R2 support true rail-to-rail input operation?
Yes - the AD8626ARM-R2's input common-mode voltage range extends from 0.2 V below V– to 2 V below V+, enabling true rail-to-rail input on the negative side and near-rail operation on the positive side. On a 5 V supply, this means inputs can go from −0.2 V to +3.0 V. Driving the input above +3.0 V increases common-mode error and reduces bandwidth, as shown in Figure 15. AD8626ARM-R2 does not exhibit phase reversal even when inputs exceed V+, unlike many legacy JFET op amps.
How does the AD8626ARM-R2 perform in photodiode preamplifier circuits compared to bipolar-input op amps?
AD8626ARM-R2 reduces photodiode preamp output error by >100× versus typical bipolar op amps due to its 1 pA max input bias current - translating to <0.75 µV error with a 1.5 MΩ feedback resistor. Its 17.5 nV/√Hz voltage noise and 0.4 fA/√Hz current noise also minimize total integrated noise in high-source-impedance configurations. AD8626ARM-R2's low offset (500 µV max) and drift (2.5 µV/°C) further ensure stable DC accuracy across temperature, making it superior for low-light, high-gain photodiode applications where bipolar alternatives introduce significant dark-current error.
Can the AD8626ARM-R2 be used in dual-supply configurations with ±2.5 V?
Yes - the AD8626ARM-R2 is fully specified for dual-supply operation from ±2.5 V to ±13 V. At ±2.5 V, it delivers rail-to-rail output swing (±2.42 V at ±2 mA), 630 µA typical supply current per amplifier, and maintains 5 MHz gain bandwidth. Input common-mode range spans −2.7 V to +0.5 V, allowing ground-referenced signal acquisition. Table 2 in the Rev. F datasheet confirms all key parameters (offset, CMRR, PSRR, noise) remain valid at ±2.5 V, making AD8626ARM-R2 suitable for low-voltage portable medical sensors and handheld test gear.
What is the thermal resistance (θJA) of the AD8626ARM-R2 in its MSOP-8 package?
The AD8626ARM-R2 in the 8-lead MSOP (RM) package has a junction-to-ambient thermal resistance (θJA) of 210°C/W, as specified in Table 4 of the Rev. F datasheet. This value assumes standard JEDEC 2-layer board conditions. With its 630 µA typical supply current per amplifier, total power dissipation is ~3.2 mW at 5 V - resulting in <0.7°C junction-to-ambient rise under still-air conditions. The exposed pad variant (RM-8) further improves thermal performance, supporting reliable operation in sealed enclosures or high-density industrial PCBs where airflow is limited. AD8626ARM-R2's low power and favorable θJA eliminate need for heatsinking in most applications.
AD8626ARM-R2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Cut Tape (CT)
- Product Status:
- Obsolete
- Amplifier Type:
- J-FET
- Number of Circuits:
- 2
- 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 (x2 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:
- 8-MSOP
AD8626ARM-R2 FAQ
1.How can I place an order for AD8626ARM-R2 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD8626ARM-R2 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 AD8626ARM-R2 reliable?
The price and inventory of AD8626ARM-R2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD8626ARM-R2 is usually 5 days.
3.What payment methods are accepted for AD8626ARM-R2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD8626ARM-R2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD8626ARM-R2?
AD8626ARM-R2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD8626ARM-R2 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 AD8626ARM-R2?
For technical support, including AD8626ARM-R2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD8626ARM-R2 requirements.
6.How does Aetrix verify that AD8626ARM-R2 is sourced from the original manufacturer or authorized distributors?
All AD8626ARM-R2 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 AD8626ARM-R2 meets industry standards.
7.What is the process for return or replacement of AD8626ARM-R2?
All AD8626ARM-R2 units undergo pre-shipment inspection (PSI). If there is an issue with AD8626ARM-R2, 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 AD8626ARM-R2 part is unused and in its original packaging.
Return procedure for AD8626ARM-R2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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