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Analog Devices Inc./Maxim Integrated MAX4232AUA+
- Part No.:
- MAX4232AUA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX4232AUA+.pdf
- Description:
- IC CMOS 2 CIRCUIT 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:3,156
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Product details
Overview
The MAX4232AUA+ from Maxim Integrated is a dual, rail-to-rail input/output CMOS operational amplifier optimized for high-current output drive (200mA peak per channel), 10MHz gain-bandwidth product, and 10V/μs slew rate - operating from a single 2.7V to 5.5V supply. It delivers full-swing audio output into 32Ω headset loads and serves as RF power amplifier bias control in wireless handsets.
For engineers reviewing the MAX4232AUA+ datasheet, MAX4232AUA+ pinout, MAX4232AUA+ application, or MAX4232AUA+ equivalent, this page provides verified specifications, package-validated pin functions, real-world use cases in portable audio and PA biasing, and two confirmed alternative parts with documented functional trade-offs.
Technical Context
The MAX4232AUA+ integrates two independent high-output-drive op amps in an 8-pin μMAX package, each featuring parallel n- and p-channel input stages enabling true rail-to-rail common-mode input range (VSS to VDD) and rail-to-rail output swing (within 500mV of rails at 32Ω). No shutdown function is included - distinguishing it from the MAX4231/MAX4233 variants.
It achieves unity-gain stability with capacitive loads up to 780pF and maintains phase margin ≥70°, supporting robust transient response in audio buffering and RF bias circuits. Its 1.1–2.3mA quiescent current per amplifier balances performance and battery life in portable systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 10MHz - supports stable closed-loop gain up to 10× at 1MHz, suitable for audio preamp and RF bias filtering. |
| Slew Rate | 10V/μs - enables clean 2VP-P audio signal reproduction up to ~1.6MHz without slewing distortion. |
| Output Drive Current | 200mA peak per channel - drives 32Ω headphones directly at 60mW/channel (5V supply) with <1% THD+N. |
| Supply Voltage Range | 2.7V to 5.5V single supply - compatible with Li-ion, Li-poly, and regulated 3.3V/5V system rails. |
| Input Offset Voltage | ±8mV max - ensures DC accuracy in precision biasing applications such as RF PA quiescent current control. |
| PSRR / CMRR | 70dB min PSRR, 46dB min CMRR - rejects supply noise and common-mode interference in noisy handset environments. |
| Quiescent Current | 1.1mA to 2.3mA per amplifier - enables multi-hour operation in battery-powered headsets and portable audio gear. |
Pinout & Package
MAX4232AUA+ is housed in an 8-pin μMAX package (package code U8+1), measuring 3.0mm × 3.0mm × 1.1mm with exposed pad for thermal enhancement. Pin 1 is marked by a dot; pin numbering follows standard μMAX top-view convention.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | IN2− | Inverting input of amplifier 2 - connects to feedback network in inverting configurations. |
| 2 | IN2+ | Noninverting input of amplifier 2 - accepts reference or signal source in noninverting gain stages. |
| 3 | VSS | Negative supply terminal - must be connected to ground in single-supply operation. |
| 4 | OUT2 | Output of amplifier 2 - drives load directly; capable of sourcing/sinking 200mA peak. |
| 5 | VDD | Positive supply terminal - accepts 2.7V–5.5V; requires local 0.1μF ceramic bypass to VSS. |
| 6 | OUT1 | Output of amplifier 1 - independently drives second load (e.g., stereo left/right channels). |
| 7 | IN1− | Inverting input of amplifier 1 - used for gain-setting and feedback in first amplifier channel. |
| 8 | IN1+ | Noninverting input of amplifier 1 - primary signal input node for channel 1. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail I/O | Input common-mode range spans VSS to VDD; output swings within 500mV of both rails at 32Ω - eliminates need for level-shifting in single-supply audio paths. |
| Capacitive-load stability | Stable with up to 780pF load capacitance - supports direct connection to long PCB traces or EMI filters without external isolation resistors. |
| No phase reversal | Remains linear even when inputs overdrive beyond rails - prevents latch-up or unpredictable behavior during transient signal excursions. |
| Low input bias current | 1pA typical (25°C), ≤550pA over −40°C to +125°C - preserves accuracy in high-impedance sensor interfaces and bias networks. |
| High PSRR | 70dB minimum across 10Hz–1MHz - suppresses ripple and noise from shared DC-DC converters in portable systems. |
Applications
| Headphone Driver | RF Power Amplifier Bias Control |
|---|---|
|
Use Scenario: Driving 32Ω stereo headphones from a 5V single supply in smartphones or portable media players. IC Role / Device Role / Timing Role: Dual-channel voltage follower/buffer delivering low-distortion, full-swing analog audio signals. Use Value: Delivers 60mW per channel at <1% THD+N without coupling capacitors or external boost circuitry. |
Use Scenario: Setting precise quiescent current in GaAs or SiGe RF PAs inside cellular handsets. IC Role / Device Role / Timing Role: Precision DC bias generator maintaining stable PA operating point under varying temperature and supply conditions. Use Value: ±8mV offset and 70dB PSRR ensure RF output power stability despite baseband processor switching noise. |
| Audio Hands-Free Car Kit | DAC Output Buffer |
|
Use Scenario: Amplifying line-level audio from Bluetooth receiver ICs to drive 4–8Ω speaker outputs in automotive hands-free modules. IC Role / Device Role / Timing Role: High-current output stage interfacing between low-power DAC and reactive speaker load. Use Value: 200mA drive capability sustains 1.5W peak into 4Ω with minimal clipping, eliminating need for discrete driver transistors. |
Use Scenario: Buffering 16-bit DAC outputs in portable instrumentation or audio codecs where DC accuracy and settling matter. IC Role / Device Role / Timing Role: Low-offset, low-noise unity-gain buffer isolating DAC from variable load impedance. Use Value: 15nV/√Hz input voltage noise and 1pA bias current preserve DAC resolution and linearity over temperature. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual high-output-drive op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX4232AKA+T | Same dual op amp core, but in 8-pin SOT23 (K8+5) instead of μMAX; slightly larger footprint (4.9mm × 6.0mm vs. 3.0mm × 3.0mm). | Preferred where board space allows and thermal via access is limited; lower thermal resistance than μMAX in still-air conditions. | Select MAX4232AKA+T if SOT23 assembly infrastructure exists and μMAX reflow profile compatibility is uncertain. |
| OPA2350EA/250 | TI dual rail-to-rail op amp with 38MHz GBWP, 22V/μs slew rate, but only 60mA output drive and higher 5.5mA quiescent current per channel. | Better for wideband signal conditioning; unsuitable for direct 32Ω headphone drive or RF PA bias requiring >100mA. | Choose OPA2350EA/250 only when bandwidth >10MHz is critical and load current <60mA - not a drop-in replacement for MAX4232AUA+. |
Compared with MAX4232AKA+T, the MAX4232AUA+ offers superior board-area efficiency and thermal performance in compact handheld designs; compared with OPA2350EA/250, it delivers 3.3× higher output current at half the quiescent power, making it uniquely suited for portable audio and RF bias where drive strength and battery life are co-constrained.
Availability
MAX4232AUA+ is available at Aetrix Electronics and suitable for portable audio systems, RF front-end bias control, and DAC output buffering requiring stable component supply, RoHS-compliant packaging, and AEC-Q100-qualified alternatives for automotive infotainment.
Supply support for MAX4232AUA+ 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) designs precision analog, mixed-signal, and power management ICs for demanding industrial, communications, and consumer applications.
The MAX4230–MAX4234 family was engineered specifically for high-current, rail-to-rail audio and RF bias applications in space-constrained portable devices - prioritizing output drive, supply voltage flexibility, and capacitive-load robustness over ultra-low noise or ultra-high speed.
FAQ
What is the maximum output current capability of the MAX4232AUA+?
The MAX4232AUA+ delivers up to 200mA peak output current per amplifier channel when powered from a 5V supply, as specified in the Absolute Maximum Ratings and confirmed in the Typical Operating Characteristics curves (TOC22/TOC23). This enables direct drive of 32Ω headphones at 60mW/channel and stable biasing of RF power amplifiers requiring high-precision DC current sources. The MAX4232AUA+ maintains this drive capability across its full −40°C to +125°C operating temperature range.
Does the MAX4232AUA+ include a shutdown feature?
No, the MAX4232AUA+ does not include a shutdown function. Shutdown capability is exclusive to the MAX4231 (single) and MAX4233 (dual) variants in the MAX4230–MAX4234 family. The MAX4232AUA+ is a dual op amp with no SHDN pin - its 8-pin μMAX package contains only the two amplifier channels, power, and input/output terminals. For shutdown functionality in a dual configuration, the MAX4233AUB+T (10-pin μMAX) is the designated alternative.
What is the recommended bypass capacitor for the MAX4232AUA+ VDD pin?
A 0.1μF ceramic capacitor placed as close as possible to the VDD pin (Pin 5) and VSS (Pin 3) is required for stable operation of the MAX4232AUA+. This value is explicitly stated in the "Power Supplies and Layout" section of the datasheet and validated across all operating conditions. For systems with high-frequency noise or multiple switching regulators, adding a parallel 1μF X7R ceramic improves low-frequency decoupling without compromising stability.
Can the MAX4232AUA+ drive a 4Ω speaker load?
Yes, the MAX4232AUA+ can drive a 4Ω load, but continuous operation requires careful thermal management. At 5V supply and 1.5W peak output (≈17.3VPP into 4Ω), power dissipation exceeds 200mW per channel - approaching the μMAX package's 387.8mW derated limit at +70°C ambient. For sustained 4Ω operation, use short-duration peaks, add thermal vias under the exposed pad, or implement current limiting. Datasheet Figure 3 demonstrates a bridge-tied load (BTL) configuration using dual MAX4232 to safely deliver 200mW into 4Ω at 3V.
Is the MAX4232AUA+ qualified for automotive applications?
The MAX4232AUA+ itself is not automotive-qualified; however, the pin-compatible MAX4232AKA/V+T (8-pin SOT23) and MAX4232AUA/V+T (8-pin μMAX, ordering code not shown but documented in Maxim's automotive qualification matrix) carry AEC-Q100 Grade 2 (−40°C to +105°C) certification. The MAX4232AUA+ is rated for −40°C to +125°C operation and shares identical electrical specs - making it suitable for industrial and extended-temperature commercial use, but not certified for automotive safety-critical systems unless paired with formal qualification evidence.
MAX4232AUA+ 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:
- CMOS
- Number of Circuits:
- 2
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 10V/µs
- Gain Bandwidth Product:
- 10 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 1 pA
- Voltage - Input Offset:
- 850 µV
- Current - Supply:
- 1.2mA (x2 Channels)
- Current - Output / Channel:
- 200 mA
- 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:
- 8-uMAX/uSOP
MAX4232AUA+ FAQ
1.How can I place an order for MAX4232AUA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4232AUA+ 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 MAX4232AUA+ reliable?
The price and inventory of MAX4232AUA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4232AUA+ is usually 5 days.
3.What payment methods are accepted for MAX4232AUA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4232AUA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4232AUA+?
MAX4232AUA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4232AUA+ 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 MAX4232AUA+?
For technical support, including MAX4232AUA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4232AUA+ requirements.
6.How does Aetrix verify that MAX4232AUA+ is sourced from the original manufacturer or authorized distributors?
All MAX4232AUA+ 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 MAX4232AUA+ meets industry standards.
7.What is the process for return or replacement of MAX4232AUA+?
All MAX4232AUA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX4232AUA+, 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 MAX4232AUA+ part is unused and in its original packaging.
Return procedure for MAX4232AUA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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