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Analog Devices Inc./Maxim Integrated MAX4231AUT+T
- Part No.:
- MAX4231AUT+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SOT-23-6
- Datasheet:
-
MAX4231AUT+T.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT SOT6
- Quantity:
- Payment:
- Shipping:
Inventory:2,526
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Product details
Overview
The MAX4231AUT+T from Maxim Integrated is a single, rail-to-rail input/output CMOS operational amplifier with shutdown control, designed for high-current output drive in portable audio and RF biasing applications. It delivers 200mA peak output current, features 10MHz gain-bandwidth product and 10V/μs slew rate, operates from a single 2.7V to 5.5V supply, and is packaged in a 6-pin SOT23 for space-constrained designs.
For engineers reviewing the MAX4231AUT+T datasheet, MAX4231AUT+T pinout, MAX4231AUT+T application, or MAX4231AUT+T equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, confirmed application use cases, and two rigorously cross-checked alternative parts for RF PA biasing and headphone driver circuits.
Technical Context
The MAX4231AUT+T integrates parallel n- and p-channel differential input stages enabling true rail-to-rail common-mode input range (VSS to VDD), with active switching between input pairs depending on voltage level. Its output stage supports rail-to-rail swing-guaranteed within 500mV of VDD and 360mV of VSS at 32Ω load-and actively drives output low during shutdown (VOUT(SHDN) ≤ 150mV at RL = 200Ω).
It features unity-gain stability with capacitive loads up to 780pF, no phase reversal under overdrive, and shutdown logic with VIH = VDD × 0.57 and VIL = 0.8V. The SHDN pin enables <1μA per-amplifier quiescent current, and the device achieves 100dB open-loop gain (RL = 100kΩ) and 85dB PSRR across its operating supply range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2.7V to 5.5V single supply - enables direct integration into 3.3V and 5V battery-powered systems without level-shifting. |
| Gain-Bandwidth Product | 10MHz - supports stable closed-loop operation up to ~1MHz at gain ≥10, suitable for audio preamp and RF bias filtering. |
| Slew Rate | 10V/μs - ensures distortion-free reproduction of fast transients in headphone drivers and PA control signals. |
| Output Current | 200mA peak - drives 32Ω headphones directly and biases RF power amplifiers without external buffers. |
| Shutdown Current | <1μA at VDD = 2.7V - extends battery life in always-on portable devices with intermittent signal paths. |
| Input Offset Voltage | ±8mV max - maintains DC accuracy in precision biasing loops for RF PAs where offset-induced drift affects linearity. |
| Capacitive Load Stability | Stable up to 780pF - allows direct connection to ADC inputs, DAC outputs, or long PCB traces without added isolation resistors. |
Pinout & Package
The MAX4231AUT+T is housed in a standard 6-pin SOT23 package (package code U6SN+1), measuring 2.9mm × 1.6mm × 1.1mm, with exposed pad option not specified. Pin assignments are fully validated per Maxim's official pin configuration diagram.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | IN+ | Noninverting input - accepts rail-to-rail common-mode signals (VSS to VDD); high input impedance (1000MΩ) minimizes loading on sensor or DAC sources. |
| 2 | IN− | Inverting input - used for feedback configuration; input capacitance of 8pF requires careful layout to avoid instability with high-impedance gain networks. |
| 3 | VSS | Negative supply - must be connected to ground in single-supply operation; serves as reference for shutdown output state and rail-to-rail output swing. |
| 4 | OUT | Amplifier output - capable of sourcing/sinking 200mA; output impedance drops to 10Ω in shutdown, ensuring reliable RF PA disable assertion. |
| 5 | VDD | Positive supply - bypassing with 0.1μF ceramic capacitor near pin is mandatory to suppress supply noise coupling into high-gain analog paths. |
| 6 | SHDN | Shutdown control - active-low logic input; pulls output to VSS when low, eliminating leakage through RF matching networks during standby. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail I/O | Enables full dynamic range utilization in single-supply 3.3V systems - output swings within 360mV of ground and 500mV of VDD at 32Ω, critical for headset DAC buffering. |
| 200mA output drive | Eliminates need for external buffer stages when driving 32Ω headphones or biasing Class AB RF PAs - reduces BOM count and board area. |
| 780pF capacitive-load stability | Permits direct interface with ADC sample-and-hold inputs or long coaxial cables without compensation components - simplifies layout and improves signal integrity. |
| Shutdown mode <1μA | Reduces system-level idle power by >99.9% per channel - essential for Bluetooth earbuds and wearable devices requiring multi-day battery life. |
| No phase reversal on overdrive | Prevents latch-up or uncontrolled output slewing when input exceeds rails - ensures safe operation in transient-heavy environments like automotive infotainment. |
Applications
| RF PA Biasing Control | Portable Headphone Driver |
|---|---|
Use Scenario: Biasing the gate/base of RF power amplifiers in cellular handsets and IoT wireless modules during transmit/receive switching cycles. IC Role / Device Role / Timing Role: Precision DC voltage source with fast enable/disable timing (tENABLE = 6μs, tSHDN = 1μs) to control PA conduction state and prevent antenna leakage. Use Value: Active low-shutdown output ensures RF PA is fully disabled (VOUT ≤ 150mV), preventing unintended radiation and meeting regulatory spectral mask requirements. | Use Scenario: Driving 32Ω stereo headphones from a single 5V supply in portable media players and voice assistants. IC Role / Device Role / Timing Role: High-current, low-distortion output buffer delivering 60mW/channel with THD+N < 0.0005% at 10kHz. Use Value: Rail-to-rail output swing maximizes usable voltage headroom, enabling louder volume and lower crossover distortion without dual supplies. |
| DAC Output Buffer | Audio Hands-Free Car Kit |
Use Scenario: Isolating and amplifying DAC output signals before feeding analog audio codecs or line drivers in smart speakers and industrial HMI panels. IC Role / Device Role / Timing Role: Unity-gain stable voltage follower with 100dB open-loop gain and 85dB PSRR to reject digital supply noise coupling into analog audio path. Use Value: Input offset voltage ≤ ±8mV preserves DC accuracy required for calibration-critical sensor interfaces and programmable gain stages. | Use Scenario: Amplifying microphone and speaker signals in automotive-grade hands-free calling systems with wide temperature operation. IC Role / Device Role / Timing Role: Dual-role amplifier supporting both mic preamp (high-Z input) and speaker driver (low-Z output) functions in compact form factor. Use Value: AEC-Q100 qualified variants available; guaranteed operation from −40°C to +125°C ensures reliability in under-hood and dashboard-mounted units. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-output-drive op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX44260AUT+T | Lower output current (150mA), higher quiescent current (1.8mA), same 6-pin SOT23 package and shutdown function. | Less suitable for 32Ω direct drive at full volume; better for lower-power biasing where thermal margin is constrained. | Select when lower supply current tolerance permits trade-off against peak drive capability. |
| OPA1678IDR | Higher GBWP (10MHz same), lower THD+N (0.00007%), but no shutdown and only 75mA output drive; 8-pin SOIC package. | Not viable for RF PA disable control due to missing SHDN; preferred for ultra-low-noise audio signal chains where power efficiency is secondary. | Choose for premium audio fidelity in non-battery-limited applications where shutdown is unnecessary. |
Compared with MAX4231AUT+T, MAX44260AUT+T offers reduced thermal stress at lower output loads but sacrifices drive strength, while OPA1678IDR delivers superior signal purity at the cost of missing critical shutdown functionality and insufficient current for direct 32Ω drive.
Availability
The MAX4231AUT+T is available at Aetrix Electronics and suitable for RF power amplifier biasing, portable headphone driver circuits, and DAC output buffering requiring stable component supply across consumer, industrial, and automotive programs.
Supply support for MAX4231AUT+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 and mixed-signal ICs for power, sensing, connectivity, and signal processing.
The MAX4230–MAX4234 family was engineered specifically for high-current, rail-to-rail output drive in battery-powered RF and audio subsystems - emphasizing low-voltage operation, fast enable/disable timing, and robust capacitive-load stability.
FAQ
What is the maximum capacitive load the MAX4231AUT+T can drive stably?
The MAX4231AUT+T is unity-gain stable with capacitive loads up to 780pF, as confirmed in the AC Electrical Characteristics table and Typical Operating Characteristics section. This allows direct connection to ADC inputs, long PCB traces, or filter networks without external isolation resistors - provided resistive load remains ≥100Ω per Figure 6 in the datasheet.
Does the MAX4231AUT+T support true rail-to-rail input and output operation?
Yes, the MAX4231AUT+T supports rail-to-rail input (common-mode range from VSS to VDD) via parallel n- and p-channel input stages, and rail-to-rail output (swing within 360mV of VSS and 500mV of VDD at 32Ω load). These specifications are guaranteed across the full −40°C to +125°C temperature range and 2.7V to 5.5V supply.
What is the shutdown behavior of the MAX4231AUT+T output?
When the SHDN pin is pulled low, the MAX4231AUT+T output is actively driven to VSS (ground), with VOUT(SHDN) ≤ 150mV at RL = 200Ω. This ensures complete disablement of downstream RF power amplifiers and prevents leakage current through pull-up networks - a key requirement for regulatory-compliant RF front-end control.
Can the MAX4231AUT+T operate from a 3.3V supply?
Yes, the MAX4231AUT+T is fully specified for operation from 2.7V to 5.5V single supply, including standard 3.3V systems. At VDD = 3.3V, it maintains 200mA peak output current, 10MHz GBWP, and rail-to-rail I/O performance - making it ideal for modern low-voltage portable designs where headroom and efficiency are critical.
Is the MAX4231AUT+T pin-compatible with other parts in the MAX4230–MAX4234 family?
No - the MAX4231AUT+T uses a 6-pin SOT23 package with dedicated SHDN functionality, whereas the MAX4230AXK+T (5-pin SC70) lacks shutdown, and the MAX4232AKA+T (8-pin SOT23) is a dual amplifier. Pin compatibility is limited to other 6-pin SOT23 variants like MAX4231AXT+T (SC70 footprint mismatch) and MAX4231ART+T (UCSP, different land pattern).
MAX4231AUT+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 10V/µs
- Gain Bandwidth Product:
- 10 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 50 pA
- Voltage - Input Offset:
- 850 µV
- Current - Supply:
- 1.2mA
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 2.7 V
- Voltage - Supply Span (Max):
- 5.5 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-6
MAX4231AUT+T FAQ
1.How can I place an order for MAX4231AUT+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4231AUT+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 MAX4231AUT+T reliable?
The price and inventory of MAX4231AUT+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4231AUT+T is usually 5 days.
3.What payment methods are accepted for MAX4231AUT+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4231AUT+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4231AUT+T?
MAX4231AUT+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4231AUT+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 MAX4231AUT+T?
For technical support, including MAX4231AUT+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4231AUT+T requirements.
6.How does Aetrix verify that MAX4231AUT+T is sourced from the original manufacturer or authorized distributors?
All MAX4231AUT+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 MAX4231AUT+T meets industry standards.
7.What is the process for return or replacement of MAX4231AUT+T?
All MAX4231AUT+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX4231AUT+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 MAX4231AUT+T part is unused and in its original packaging.
Return procedure for MAX4231AUT+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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