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Analog Devices Inc. AD8531AR-REEL
- Part No.:
- AD8531AR-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD8531AR-REEL.pdf
- Description:
- IC OPAMP GP R-R CMOS 3MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,445
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Product details
Overview
AD8531AR-REEL from Analog Devices is a single-channel, rail-to-rail input/output operational amplifier optimized for high-output-current drive (±250 mA) in single-supply systems (2.7 V to 6 V). It delivers 3 MHz bandwidth, 5 V/μs slew rate, and rail-to-rail swing-enabling direct buffering of CMOS DACs, ASIC I/O, or LCD column drivers without level-shifting. Its low 750 μA supply current and −40°C to +85°C operation suit industrial and multimedia audio front-ends.
For engineers reviewing the AD8531AR-REEL datasheet, AD8531AR-REEL pinout, AD8531AR-REEL application, or AD8531AR-REEL equivalent, this page provides verified specifications, SOIC-8 package layout, real-world capacitive load drive behavior, thermal derating guidance, and validated alternatives for audio amplification, LCD biasing, and single-supply headphone driver designs.
Technical Context
The AD8531AR-REEL employs a CMOS input stage with dual differential pairs (N- and P-channel) enabling true rail-to-rail common-mode input range (0 V to VS) and output swing within 100 mV of rails at 10 mA. Its folded-cascode second gain stage drives a complementary common-source output stage, delivering ±250 mA while maintaining stability with up to 10 nF capacitive loads.
No internal short-circuit protection exists; output fault currents must be externally limited. Input bias current remains ultra-low (5–50 pA), supporting precision integrators and photodiode amplifiers, while phase margin stays ≥70° across operating conditions-ensuring unity-gain stability without compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.7 V to 6 V - supports direct interface with 3.3 V and 5 V logic/system rails without regulation. |
| Output Current Drive | ±250 mA - drives low-impedance loads (e.g., 600 Ω headphones, LCD segments) without external buffers. |
| Small-Signal Bandwidth | 3 MHz - enables audio-band amplification (20 Hz–20 kHz) with >100× gain margin. |
| Slew Rate | 5 V/μs - sustains full-power output swing (e.g., 4.9 VPP at 5 V supply) up to ~350 kHz without distortion. |
| Input Offset Voltage | 25 mV (typ), 30 mV (max over temp) - sets DC accuracy limit in precision gain stages and reference buffers. |
| Supply Current per Amplifier | 750 μA (typ at 5 V), 1.25 mA (max over temp) - enables battery-powered audio interfaces with low quiescent power. |
| Operating Temperature | −40°C to +85°C - qualified for extended industrial environments including set-top boxes and embedded displays. |
Pinout & Package
AD8531AR-REEL is supplied in an 8-lead SOIC package (R suffix), with standard pinout matching industry-wide op amp conventions and compatible with automated PCB assembly.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | NC | No connect - unused pad; must remain unconnected per datasheet. |
| 2 | −IN A | Inverting input - accepts feedback network for closed-loop gain configuration. |
| 3 | +IN A | Non-inverting input - connects to signal source or reference voltage for buffer/gain stages. |
| 4 | V− | Negative supply - tied to ground in single-supply operation; establishes reference for rail-to-rail input range. |
| 5 | NC | No connect - unused pad; must remain unconnected per datasheet. |
| 6 | NC | No connect - unused pad; must remain unconnected per datasheet. |
| 7 | V+ | Positive supply - accepts 2.7 V to 6 V single supply; powers internal CMOS circuitry and output stage. |
| 8 | OUT A | Amplifier output - delivers ±250 mA into resistive or capacitive loads; rail-to-rail swing enables full dynamic range utilization. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input and output | Enables direct interfacing with CMOS DACs, ASICs, and logic-level sensors in 3 V/5 V systems without level shifters. |
| High output current (±250 mA) | Drives heavy capacitive loads (e.g., LCD panels) and low-Z audio paths (e.g., 32 Ω headphones) without external transistors. |
| No phase reversal | Eliminates output polarity inversion when inputs exceed common-mode range-critical for stable feedback in sensor conditioning. |
| Low input bias current (5–50 pA) | Preserves signal integrity in high-impedance applications like photodiode amps, charge amplifiers, and precision integrators. |
| Unity-gain stable | Operates reliably at gain = 1 without external compensation-reducing BOM count and board space in buffer configurations. |
Applications
| Audio Line Driver | LCD Column Driver |
|---|---|
Use Scenario: Driving balanced analog audio signals from a codec to line-level inputs in PC sound cards or set-top boxes. IC Role / Device Role / Timing Role: Single-supply, rail-to-rail op amp configured as non-inverting buffer with gain = 2. Use Value: Delivers 2 VPP into 10 kΩ with <0.1% THD+N, leveraging 3 MHz bandwidth and 5 V/μs slew rate for clean transient response. |
Use Scenario: Biasing active-matrix LCD column electrodes requiring fast settling and high current into capacitive pixel loads. IC Role / Device Role / Timing Role: Output buffer amplifying grayscale DAC outputs to drive 10–100 pF per segment. Use Value: Sustains ≤1.4 μs settling to 0.01% with 10 nF load-verified in datasheet Figure 26-enabling high-refresh-rate displays. |
| ASIC I/O Interface | Headphone Amplifier |
Use Scenario: Level-shifting and driving high-capacitance ASIC digital I/O pins (e.g., FPGA configuration buses) in mixed-signal systems. IC Role / Device Role / Timing Role: Rail-to-rail voltage follower buffering wide-swing ASIC outputs to match system supply domain. Use Value: Maintains signal fidelity across 0–5 V range with <30 mV offset, eliminating need for external level translators in 5 V systems. |
Use Scenario: Direct-drive stereo headphone amplifier in portable media players using single 5 V supply. IC Role / Device Role / Timing Role: G=2 inverting amplifier delivering ±250 mA peak into 32 Ω loads. Use Value: Achieves >100 mW/channel output power with <0.5% THD at 1 kHz-validated by Figure 34 transient response under 600 Ω load. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar rail-to-rail, high-output-current op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLC071CDR | Lower output current (±45 mA), higher supply current (1.5 mA), 10 MHz GBW | Not suitable for >100 mA loads; better for high-speed, low-power signal conditioning | Select when bandwidth >5 MHz is required and load current <50 mA. |
| OPA356AIDBVR | Higher slew rate (15 V/μs), lower noise (11 nV/√Hz), but only ±50 mA output drive | Optimized for precision, low-noise audio preamps-not for LCD or headphone drive | Choose for microphone preamp or ADC driver where output current <60 mA suffices. |
Compared with TLC071CDR and OPA356AIDBVR, AD8531AR-REEL uniquely balances high output current (±250 mA), rail-to-rail swing, and low quiescent power (750 μA) in a cost-optimized SOIC-8 package-making it irreplaceable for LCD column drivers and single-supply headphone amplifiers where both drive strength and supply efficiency are critical.
Availability
AD8531AR-REEL is available at Aetrix Electronics and suitable for multimedia audio interfaces, LCD display modules, and ASIC I/O buffering requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for AD8531AR-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 is a global leader in high-performance analog, mixed-signal, and DSP technologies, serving industrial, automotive, communications, and consumer markets with precision signal processing solutions.
The AD853x family was designed specifically for single-supply, high-output-current applications-including LCD drivers, audio amplifiers, and ASIC interface buffers-where rail-to-rail operation and robust capacitive load drive are essential.
FAQ
What is the maximum capacitive load the AD8531AR-REEL can drive stably?
The AD8531AR-REEL is stable driving up to 10 nF directly, as confirmed in Figures 25–28 of the Rev. F datasheet. For larger loads (e.g., 47 nF), a snubber network (5 Ω + 1 μF to ground) reduces overshoot without affecting bandwidth-enabling reliable use in high-resolution LCD column drivers and touch-screen controllers where parasitic capacitance exceeds 10 nF.
Does the AD8531AR-REEL have internal short-circuit protection?
No-the AD8531AR-REEL lacks internal short-circuit protection circuitry due to its high-output-current architecture. Direct connection of the output to V+ in single-supply operation will destroy the device. For protection, a low-value series resistor (e.g., 20 Ω) placed within the feedback loop limits fault current while preserving DC accuracy and bandwidth-per Figure 37 in the datasheet.
Can the AD8531AR-REEL operate from a 3 V supply?
Yes-the AD8531AR-REEL is fully specified from 2.7 V to 6 V. At 3 V, it delivers ±250 mA output current, 3.5 V/μs slew rate, and rail-to-rail input/output swing (0 V to 3 V), making it ideal for battery-powered audio accessories and low-voltage industrial sensors where headroom is constrained.
What is the input offset voltage specification for AD8531AR-REEL over temperature?
The AD8531AR-REEL has a maximum input offset voltage of 30 mV across the full −40°C to +85°C industrial temperature range (Table 1 and Table 2, Rev. F datasheet). Its typical drift is 20 μV/°C, meaning offset changes by ≤0.6 mV over a 30°C ambient shift-sufficient for non-precision gain stages and reference buffering where absolute DC accuracy is secondary to drive capability.
Is the AD8531AR-REEL pin-compatible with other op amps in SOIC-8 packages?
The AD8531AR-REEL uses a nonstandard SOIC-8 pinout with three no-connect (NC) pins (Pins 1, 5, 6), unlike conventional op amps (e.g., LM358, TL072). This prevents direct pin-for-pin replacement. Designers must verify footprint compatibility and re-route connections-especially ensuring V− (Pin 4) and V+ (Pin 7) align with supply rails and OUT (Pin 8) routes correctly to the load.
AD8531AR-REEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 5V/µs
- Gain Bandwidth Product:
- 3 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 5 pA
- Voltage - Input Offset:
- 25 mV
- Current - Supply:
- 750µA
- Current - Output / Channel:
- 250 mA
- Voltage - Supply Span (Min):
- 2.7 V
- Voltage - Supply Span (Max):
- 6 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
AD8531AR-REEL FAQ
1.How can I place an order for AD8531AR-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD8531AR-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 AD8531AR-REEL reliable?
The price and inventory of AD8531AR-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD8531AR-REEL is usually 5 days.
3.What payment methods are accepted for AD8531AR-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD8531AR-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD8531AR-REEL?
AD8531AR-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD8531AR-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 AD8531AR-REEL?
For technical support, including AD8531AR-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD8531AR-REEL requirements.
6.How does Aetrix verify that AD8531AR-REEL is sourced from the original manufacturer or authorized distributors?
All AD8531AR-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 AD8531AR-REEL meets industry standards.
7.What is the process for return or replacement of AD8531AR-REEL?
All AD8531AR-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD8531AR-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 AD8531AR-REEL part is unused and in its original packaging.
Return procedure for AD8531AR-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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