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Analog Devices Inc./Maxim Integrated MAX4166ELA+T
- Part No.:
- MAX4166ELA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-WFDFN
- Datasheet:
-
MAX4166ELA+T.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,416
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Product details
Overview
MAX4166ELA+T from Maxim Integrated is a single-channel, rail-to-rail input/output operational amplifier with shutdown control, designed for high-output-drive precision analog signal conditioning in low-voltage battery-powered systems. It delivers ±80mA output current, operates from +2.7V to +6.5V single supply, features 5MHz gain-bandwidth product, 250µV typical input offset voltage, and 1.2mA quiescent supply current - enabling direct drive of headphones, speakers, and capacitive loads up to 250pF.
For engineers reviewing the MAX4166ELA+T datasheet, MAX4166ELA+T pinout, MAX4166ELA+T application, or MAX4166ELA+T equivalent, key selection considerations include its µDFN-8 (2mm × 2mm × 0.8mm) package, active-low shutdown functionality (38µA shutdown current), rail-to-rail I/O swing, and guaranteed 80mA output drive into 25Ω loads - critical for portable audio, DAC buffering, and line driving where space, power, and dynamic range are constrained.
Technical Context
The MAX4166ELA+T employs a dual-input-stage architecture (NPN/PNP) to achieve rail-to-rail common-mode input range extending 0.25V beyond VEE and VCC, with seamless transition near mid-supply to minimize CMRR degradation. Its output stage uses complementary push-pull circuitry to deliver full rail-to-rail swing - within 430mV of VCC and 160mV of VEE at 5V/25Ω - while maintaining stability with capacitive loads ≤250pF without external compensation.
Shutdown is implemented via an active-low SHDN pin that disables the amplifier core, reducing ICC to 38µA (VCC = 3V) and placing the output in high-impedance state. The device is unity-gain stable and exhibits no phase reversal under overdriven input conditions, supporting robust operation in transient-heavy audio and motor-driver interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | +2.7V to +6.5V single supply - enables direct integration into Li-ion (3.0–4.2V), 3.3V, and 5V systems without level-shifting. |
| Output Drive Current | ±80mA min - sufficient to directly drive 32Ω headphones or 25Ω transformer-coupled lines without external buffers. |
| Gain-Bandwidth Product | 5MHz - supports audio bandwidth (20Hz–20kHz) with >250× open-loop gain margin at 20kHz for low-distortion amplification. |
| Input Offset Voltage | 0.35mV (typ), 4.9mV (max, -40°C to +85°C) - ensures DC accuracy in precision sensor interfaces and DAC output buffering. |
| Rail-to-Rail I/O Swing | VOL ≤ 25mV @ RL = 100kΩ, VOH ≥ VCC − 30mV @ RL = 100kΩ - maximizes dynamic range in single-supply 3.3V/5V signal chains. |
| Shutdown Current | 38µA (typ, VCC = 3V) - reduces system standby power in portable devices with on-demand audio activation. |
| PSRR / CMRR | 65dB (min, full temp range) - rejects supply noise and common-mode interference in noisy embedded environments. |
Pinout & Package
MAX4166ELA+T is housed in an 8-pin µDFN package (2mm × 2mm × 0.8mm, exposed pad), optimized for space-constrained portable designs. Pin 1 is marked by a dot; the exposed thermal pad (EP) must be soldered to PCB ground for thermal performance and EMI reduction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (N.C.) | No Connection | Internally unconnected - leave floating or tie to ground per layout best practices; no electrical function. |
| 2 (VCC) | Positive Supply | Primary power input; requires local 0.1µF ceramic + ≥1µF bulk decoupling to ground for stability. |
| 3 (OUT) | Amplifier Output | High-current rail-to-rail output capable of sourcing/sinking ±80mA; drives capacitive loads ≤250pF directly. |
| 4 (SHDN) | Active-Low Shutdown Input | Pull ≤0.8V to enter shutdown (38µA ICC); pull ≥2.0V or float to enable - compatible with 1.8V/3.3V logic. |
| 5 (N.C.) | No Connection | Internally unconnected - do not route signals; avoid stubs to prevent parasitic coupling. |
| 6 (VEE) | Negative Supply / Ground | Ground reference for single-supply operation; connect directly to low-impedance system ground plane. |
| 7 (IN−) | Inverting Input | Differential input node; 500kΩ input resistance for |VDIFF| < 1.8V; protected by 1kΩ series resistors and back-to-back diodes. |
| 8 (IN+) | Noninverting Input | Differential input node; matched bias current path to IN− enables low-offset noninverting configurations with R3 = R1∥R2. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input common-mode range | Extends 0.25V beyond VEE and VCC - enables full-scale signal acquisition in 3.3V systems without input attenuation. |
| 80mA minimum output current | Drives 32Ω loads at 1Vrms with <0.02% THD+N - eliminates need for discrete output transistors in headphone drivers. |
| Unity-gain stable with 250pF load | Eliminates external compensation components in DAC buffer and line driver applications - reduces BOM count and board area. |
| No phase reversal on overdrive | Prevents latch-up and output saturation artifacts during input transients - critical for fault-tolerant audio and motor control feedback paths. |
| Low-power shutdown mode | Reduces ICC to 38µA (VCC = 3V) and places OUT in high-Z - enables rapid power cycling in wake-on-audio or voice-activated systems. |
Applications
| Portable Headphone Driver | DAC Output Buffer |
|---|---|
Use Scenario: Driving 16–32Ω stereo headphones from a low-voltage portable media player with Li-ion battery (3.0–4.2V). IC Role / Device Role / Timing Role: Single-supply, rail-to-rail output op amp configured as noninverting amplifier with gain = 2–4, delivering clean audio with minimal external components. Use Value: 80mA drive capability and 250µV offset ensure loud, low-distortion playback without clipping or DC pop at startup/shutdown. |
Use Scenario: Buffering the analog output of a 16-bit DAC in a battery-powered data logger, requiring DC accuracy and low noise. IC Role / Device Role / Timing Role: Precision unity-gain follower with rail-to-rail input to preserve full DAC code range and reject supply ripple. Use Value: 65dB PSRR and 4.9mV max VOS over temperature maintain <0.1% full-scale error across operating conditions. |
| Transformer Line Driver | Single-Supply Speaker Amplifier |
Use Scenario: Driving balanced/unbalanced audio lines (600Ω) in compact set-top boxes or sound cards using 3.3V or 5V rails. IC Role / Device Role / Timing Role: High-output-current op amp in inverting configuration with transformer-coupled output to isolate ground loops. Use Value: ±80mA sink/source and 5MHz GBWP support 20kHz full-swing signals into reactive loads without slew limiting. |
Use Scenario: Direct speaker drive (8Ω or 32Ω) in hands-free car kits or Bluetooth speakers powered from 3.7V Li-ion cells. IC Role / Device Role / Timing Role: Single-supply rail-to-rail op amp with AC-coupled output and shutdown control for power gating. Use Value: 430mV headroom at 5V/25Ω and 38µA shutdown current extend battery life while delivering >100mW into 32Ω. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-output-drive, rail-to-rail op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA1678IDR | Lower output current (±35mA), higher GBWP (10MHz), no shutdown, SO-8 package (3.9mm × 4.9mm). | Better suited for wideband instrumentation; unsuitable for 32Ω headphone drive or 25Ω line loads. | Select when bandwidth >5MHz is required and output current <50mA suffices; avoid for portable audio output stages. |
| TS912IDT | Lower output current (±45mA), wider supply range (2.7–16V), no shutdown, SO-8 package, higher VOS (1.5mV typ). | More flexible for mixed-voltage industrial systems; lacks low-power shutdown for battery optimization. | Choose for cost-sensitive industrial sensors or general-purpose buffering where shutdown and 80mA drive are unnecessary. |
Compared with OPA1678IDR and TS912IDT, the MAX4166ELA+T uniquely combines 80mA output drive, active-low shutdown (38µA), and µDFN-8 packaging - making it the only option among the three qualified for space- and power-constrained portable audio output stages requiring direct low-impedance load driving.
Availability
MAX4166ELA+T is available at Aetrix Electronics and suitable for portable audio systems, DAC buffering, and transformer line driving requiring stable component supply, lead-free compliance, and extended temperature operation (-40°C to +85°C).
Supply support for MAX4166ELA+T 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
Maxim Integrated (now part of Analog Devices) is a semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, communications, and consumer applications.
The MAX4165–MAX4169 family was engineered specifically for low-voltage, battery-powered audio and signal-conditioning systems demanding rail-to-rail operation, high output current, and ultra-low quiescent power - with the MAX4166ELA+T targeting miniaturized portable designs via its µDFN-8 footprint.
FAQ
What is the maximum capacitive load the MAX4166ELA+T can drive stably?
The MAX4166ELA+T is unity-gain stable with capacitive loads up to 250pF without external compensation. This is confirmed in the datasheet's AC Electrical Characteristics and Typical Operating Characteristics (Figure 8). Exceeding 250pF may cause peaking or oscillation; for larger loads (e.g., 1500pF), a series isolation resistor (e.g., 39Ω) between the output and load restores stability, as shown in Figure 10.
Does the MAX4166ELA+T require external components for shutdown functionality?
No. The MAX4166ELA+T implements shutdown via its dedicated SHDN pin (Pin 4): pulling this pin ≤0.8V enters shutdown mode (ICC ≤75µA), while leaving it floating or tying it ≥2.0V enables normal operation. No external pull-up resistors are required - the internal logic accepts direct connection to 1.8V or 3.3V GPIOs.
What is the thermal pad (EP) connection requirement for the MAX4166ELA+T µDFN package?
The exposed thermal pad (EP) on the underside of the MAX4166ELA+T µDFN-8 package must be soldered to a solid copper ground plane on the PCB. This connection provides critical thermal dissipation (derating: 4.8mW/°C above +70°C) and reduces EMI susceptibility. Failure to connect EP may result in thermal shutdown or degraded PSRR/CMRR performance.
Can the MAX4166ELA+T operate from a 3.0V Li-ion battery throughout its discharge curve?
Yes. The MAX4166ELA+T operates from +2.7V to +6.5V, covering the full Li-ion discharge range (≈3.0V to 4.2V). At VCC = 3.0V, it maintains 80mA output drive, 5MHz GBWP, and rail-to-rail swing - verified in DC/AC Electrical Characteristics tables and Figures 16–17 (output voltage vs. temperature at 2.7V/6.5V).
Is the MAX4166ELA+T pin-compatible with other members of the MAX4165–MAX4169 family?
No. The MAX4166ELA+T uses an 8-pin µDFN package with unique pinout (e.g., N.C. on Pins 1 and 5, SHDN on Pin 4). It is not pin-compatible with the SOT23-5 MAX4165, SO-8 MAX4166ESA, or µMAX-8 MAX4166EUA. Substitution requires PCB layout revision - verify pin mapping against the "Pin Configurations" section (page 14) before redesign.
MAX4166ELA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-WFDFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 2V/µs
- Gain Bandwidth Product:
- 5 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 50 nA
- Voltage - Input Offset:
- 350 µV
- Current - Supply:
- 1.3mA
- Current - Output / Channel:
- 125 mA
- Voltage - Supply Span (Min):
- 2.7 V
- Voltage - Supply Span (Max):
- 6.5 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-µDFN (2x2)
MAX4166ELA+T FAQ
1.How can I place an order for MAX4166ELA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4166ELA+T 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 MAX4166ELA+T reliable?
The price and inventory of MAX4166ELA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4166ELA+T is usually 5 days.
3.What payment methods are accepted for MAX4166ELA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4166ELA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4166ELA+T?
MAX4166ELA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4166ELA+T 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 MAX4166ELA+T?
For technical support, including MAX4166ELA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4166ELA+T requirements.
6.How does Aetrix verify that MAX4166ELA+T is sourced from the original manufacturer or authorized distributors?
All MAX4166ELA+T 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 MAX4166ELA+T meets industry standards.
7.What is the process for return or replacement of MAX4166ELA+T?
All MAX4166ELA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX4166ELA+T, 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 MAX4166ELA+T part is unused and in its original packaging.
Return procedure for MAX4166ELA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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