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Analog Devices Inc./Maxim Integrated MAX4166EUA+
- Part No.:
- MAX4166EUA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX4166EUA+.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:120
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Product details
Overview
MAX4166EUA+ from Maxim Integrated is a single-channel, rail-to-rail input/output operational amplifier with shutdown control, designed for high-output-drive audio and low-voltage portable applications. It delivers ±80mA output current, operates from +2.7V to +6.5V single supply, features 5MHz gain-bandwidth, 250µV offset voltage, and consumes only 1.2mA quiescent current - enabling efficient headphone and speaker driver implementations in space-constrained designs.
For engineers reviewing the MAX4166EUA+ datasheet, MAX4166EUA+ pinout, MAX4166EUA+ application, or MAX4166EUA+ equivalent, key selection considerations include its µMAX-8 package footprint, active-low shutdown functionality (38µA shutdown current), rail-to-rail swing into 25Ω loads, unity-gain stability with up to 250pF capacitive loads, and guaranteed performance across –40°C to +85°C.
Technical Context
The MAX4166EUA+ 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 delivers full swing into heavy resistive loads while maintaining low distortion at audio frequencies.
Shutdown is implemented via an active-low SHDN pin that disables the amplifier core and places the output in high-impedance state, reducing supply current to 38µA (at VCC = 3V). The device remains unity-gain stable driving capacitive loads up to 250pF without external compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | +2.7V to +6.5V single supply - supports direct battery operation from Li-ion (3.0–4.2V) or two alkaline cells (3.0V). |
| Output Drive Current | ±80mA min - sufficient to drive 32Ω headphones directly or 8Ω speakers with appropriate biasing. |
| Gain-Bandwidth Product | 5MHz - enables stable audio amplification up to ~100kHz with moderate closed-loop gain. |
| Input Offset Voltage | 0.35mV (typ), 4.9mV (max, –40°C to +85°C) - ensures low DC error in precision signal conditioning paths. |
| Quiescent Supply Current | 1.2mA per amplifier (at VCC = 3V) - balances performance and battery life in portable systems. |
| Shutdown Supply Current | 38µA (at VCC = 3V) - enables ultra-low-power sleep mode for system-level power management. |
| Input Common-Mode Range | VEE – 0.25V to VCC + 0.25V - allows sensing signals below ground or above supply in single-supply configurations. |
Pinout & Package
The MAX4166EUA+ is housed in an 8-pin µMAX package (3.0mm × 3.0mm × 1.1mm body, 0.65mm pitch), optimized for compact PCB layouts in portable electronics.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT | Amplifier output - rail-to-rail swing, capable of sourcing/sinking ±80mA into resistive loads. |
| 2 | N.C. | No internal connection - must be left floating or grounded per layout best practices; not used for signal or power. |
| 3 | VEE | Negative supply terminal - tied to ground in single-supply operation; establishes reference for rail-to-rail inputs/outputs. |
| 4 | IN− | Inverting input - high-impedance node (±150nA bias current); requires matched source impedance to IN+ for offset minimization. |
| 5 | IN+ | Noninverting input - same bias current as IN−; differential input protected by 1kΩ series resistors and back-to-back diodes. |
| 6 | VCC | Positive supply terminal - bypass with 0.1µF ceramic + ≥1µF bulk capacitor for stable audio performance. |
| 7 | SHDN | Active-low shutdown control - logic low (<0.8V) disables amplifier and forces output high-Z; logic high (≥2.0V) enables operation. |
| 8 | N.C. | No internal connection - electrically isolated; no routing or soldering required. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail I/O swing into 25Ω | Guaranteed output within 430mV of VCC and 160mV of VEE at VCC = 5V - enables full dynamic range in low-voltage speaker drivers. |
| No phase reversal on overdrive | Input stage avoids output polarity inversion when inputs exceed common-mode range - prevents latch-up in transient conditions. |
| Capacitive load stability | Stable with ≤250pF loads without isolation resistor - simplifies filter design and reduces component count in DAC buffer stages. |
| Low THD+N at 10kHz | 0.005% typical (RL = 100kΩ, VOUT = 2Vp-p) - meets fidelity requirements for portable audio line-out and headphone amplification. |
| High PSRR and CMRR | 86dB PSRR / 89dB CMRR (typ, +25°C) - rejects supply noise and common-mode interference in noisy embedded environments. |
Applications
| Portable Headphone Driver | Laptop Audio Output Stage |
|---|---|
Use Scenario: Driving 16–32Ω stereo headphones from a 3.3V or 5V system rail in ultraportable laptops and tablets. IC Role / Device Role / Timing Role: Single-supply, rail-to-rail output op amp configured as noninverting amplifier with gain of 2–4, buffering DAC output. Use Value: Delivers >100mW into 32Ω with <0.01% THD+N and zero coupling capacitor needed due to rail-to-rail output swing. |
Use Scenario: Line-level audio output for integrated sound cards requiring low-noise, low-distortion buffering before jack connectors. IC Role / Device Role / Timing Role: Precision unity-gain buffer between audio codec DAC and analog output path. Use Value: 250µV offset and 88dB PSRR ensure clean DC-coupled output unaffected by digital supply noise or thermal drift. |
| Set-Top Box Audio Amplifier | Motor Driver Signal Conditioning |
Use Scenario: Low-cost mono speaker driver (8Ω) in consumer STBs powered from 5V rail, requiring minimal external components. IC Role / Device Role / Timing Role: Single-ended output stage with DC-blocking capacitor and gain-setting feedback network. Use Value: ±80mA drive capability enables 500mW output into 8Ω with <1% THD at 1kHz, eliminating need for discrete transistor stages. |
Use Scenario: Current-sense amplifier interface and PWM signal conditioning in BLDC motor control modules operating from 3.3V/5V rails. IC Role / Device Role / Timing Role: High-precision, fast-settling buffer for analog feedback signals prior to ADC sampling. Use Value: 5MHz GBWP and 21V/µs slew rate support accurate capture of motor current transients up to 100kHz bandwidth. |
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 |
|---|---|---|---|
| MAX44263ETA+ | Lower quiescent current (350µA), lower output drive (±35mA), no shutdown, 10MHz GBWP | Better suited for low-power sensor signal chains than audio output stages | Select when power budget is tighter than drive requirement and shutdown is unnecessary |
| OPA1678IDR | Higher precision (10µV offset), lower noise (7.5nV/√Hz), ±50mA drive, no shutdown, SO-8 package | Optimized for studio-grade line drivers, not portable speaker/headphone loads | Select when ultra-low distortion and DC accuracy outweigh drive strength and shutdown needs |
Compared with MAX44263ETA+ and OPA1678IDR, the MAX4166EUA+ uniquely combines high-current drive, active shutdown, rail-to-rail swing into low impedances, and µMAX packaging - making it the only option among the three qualified for battery-powered headphone amplification with dynamic power management.
Availability
MAX4166EUA+ is available at Aetrix Electronics and suitable for portable audio systems, laptop audio subsystems, and set-top box speaker drivers requiring stable component supply, extended temperature operation (–40°C to +85°C), and lead-free compliance.
Supply support for MAX4166EUA+ 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 systems demanding both precision DC performance and high-output current - bridging the gap between general-purpose op amps and dedicated audio power amplifiers.
FAQ
What is the maximum capacitive load the MAX4166EUA+ can drive stably?
The MAX4166EUA+ is unity-gain stable driving capacitive loads up to 250pF without external compensation. This specification is verified across temperature and supply voltage ranges per the manufacturer's AC electrical characteristics table. Exceeding 250pF may cause peaking or oscillation unless an isolation resistor (e.g., 10–39Ω) is added in series with the output. The MAX4166EUA+ datasheet Figure 8 defines the stable region for combined resistive and capacitive loading.
Does the MAX4166EUA+ require a dual supply, or can it operate from a single rail?
The MAX4166EUA+ operates from a single +2.7V to +6.5V supply or dual ±1.35V to ±3.25V supplies. In single-supply mode, VEE is connected to ground, enabling true rail-to-rail input and output operation - critical for interfacing with modern low-voltage DACs and ADCs. No level-shifting circuitry is needed, and the input common-mode range extends 0.25V below ground and above VCC.
How does the shutdown function behave on the MAX4166EUA+?
The MAX4166EUA+ features an active-low SHDN pin (Pin 7). When pulled below 0.8V, the amplifier core disables, supply current drops to 38µA (at VCC = 3V), and the output enters a high-impedance state - isolating downstream circuitry. Pulling SHDN ≥2.0V or leaving it open enables normal operation. The shutdown transition completes within 5µs, as confirmed by Figures 12–13 in the MAX4166EUA+ datasheet.
What is the output voltage swing capability of the MAX4166EUA+ into a 25Ω load?
At VCC = 5V, the MAX4166EUA+ guarantees an output swing within 430mV of VCC (VOH ≥ 4.57V) and within 160mV of VEE (VOL ≤ 160mV) into a 25Ω load referenced to ground. This rail-to-rail performance enables >1.5Vrms output into 32Ω headphones without coupling capacitors, preserving low-frequency response and minimizing component count in portable audio designs.
Is the MAX4166EUA+ pin-compatible with other devices in the MAX4165–MAX4169 family?
No - the MAX4166EUA+ uses an 8-pin µMAX package with specific pinout (OUT, N.C., VEE, IN−, IN+, VCC, SHDN, N.C.), distinct from the 5-pin SOT23 of MAX4165 or the 8-pin SO/DIP variants of MAX4166ESA/EPA. Pin compatibility exists only within identical package types (e.g., MAX4166EUA+ and MAX4166ELA+ share µMAX/µDFN footprints but differ in thermal performance). Always verify pin mapping using the "Pin Configurations" section of the MAX4166EUA+ datasheet.
MAX4166EUA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- 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-uMAX/uSOP
MAX4166EUA+ FAQ
1.How can I place an order for MAX4166EUA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4166EUA+ 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 MAX4166EUA+ reliable?
The price and inventory of MAX4166EUA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4166EUA+ is usually 5 days.
3.What payment methods are accepted for MAX4166EUA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4166EUA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4166EUA+?
MAX4166EUA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4166EUA+ 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 MAX4166EUA+?
For technical support, including MAX4166EUA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4166EUA+ requirements.
6.How does Aetrix verify that MAX4166EUA+ is sourced from the original manufacturer or authorized distributors?
All MAX4166EUA+ 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 MAX4166EUA+ meets industry standards.
7.What is the process for return or replacement of MAX4166EUA+?
All MAX4166EUA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX4166EUA+, 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 MAX4166EUA+ part is unused and in its original packaging.
Return procedure for MAX4166EUA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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