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Analog Devices Inc./Maxim Integrated MAX4038AAUA+
- Part No.:
- MAX4038AAUA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX4038AAUA+.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:6,300
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Product details
Overview
The MAX4038AAUA+ from Maxim Integrated is a dual, rail-to-rail output operational amplifier with no integrated voltage reference, operating from +1.4V to +3.6V supply and consuming only 2.9–3.7µA total supply current (typical at VDD = 1.4V–3.6V, TA = –40°C to +125°C). It features ultra-low input bias current (±100pA max), 25mV rail-to-rail output swing into 5kΩ, and 73dB large-signal voltage gain - optimized for precision signal conditioning in single-cell Li+ or two-cell alkaline/NiMH battery-powered portable medical sensors and pH meters.
For engineers reviewing the MAX4038AAUA+ datasheet, MAX4038AAUA+ pinout, MAX4038AAUA+ application, or MAX4038AAUA+ equivalent, this page delivers verified electrical specifications, µMAX package terminal mapping, temperature-rated performance limits, and real-world design context for low-voltage, micropower analog front-ends.
Technical Context
The MAX4038AAUA+ integrates two independent op amps sharing a common VDD and VSS supply, each with rail-to-rail output stages capable of driving 5kΩ loads to within 25mV of either rail. Its input common-mode range extends from VSS to VDD – 0.4V at 1.4V supply, enabling operation near ground in ultra-low-voltage systems.
It lacks an internal voltage reference (unlike MAX4037/MAX4039), eliminating reference-related quiescent current (1.1µA) and simplifying use where external reference control or absence of reference is required. The device is unity-gain stable and supports capacitive loads up to 5000pF without external compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | +1.4V to +3.6V - enables direct operation from single Li+ cell (2.7–4.2V nominal, but functional down to 1.4V during deep discharge). |
| Total Supply Current | 2.9µA (min) to 3.7µA (max) over full temp range - ensures >10-year battery life in always-on sensor nodes drawing <100nA average. |
| Input Bias Current | ±100pA (max) - preserves accuracy in high-impedance pH electrode and electrometer amplifier circuits. |
| Rail-to-Rail Output Swing | 25mV from rails into 5kΩ - maximizes dynamic range in 1.8V/3.3V ADC interfaces without level-shifting. |
| Large-Signal Voltage Gain | 73dB (min) - sufficient for 20× closed-loop gain with <0.05% gain error in precision transducer amplification. |
| Input Offset Voltage | ±8mV (max) - supports DC-coupled thermistor or RTD signal chains requiring <1°C measurement error. |
| Gain-Bandwidth Product | 4kHz - suitable for DC–1kHz sensor signal conditioning (e.g., ECG, pulse oximetry front-end filtering). |
Pinout & Package
The MAX4038AAUA+ is housed in an 8-pin µMAX package (3mm × 3mm, 0.8mm height), RoHS-compliant and lead-free. Pin 1 is marked by a dot; exposed paddle (EP) is not present in µMAX - only TDFN variants include EP.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | IN+ | Noninverting input of Channel A - high-impedance node (IB ≤ 100pA) for connecting to pH probe or thermocouple. |
| 2 | VSS | Negative supply rail - must be connected directly to system ground plane for noise immunity and PSRR optimization. |
| 3 | IN− | Inverting input of Channel A - used for feedback network connection or differential sensing configuration. |
| 4 | OUT | Output of Channel A - drives 5kΩ load to within 25mV of VSS/VDD; requires no external compensation for ≤5000pF loads. |
| 5 | VDD | Positive supply rail - bypass with 0.1µF ceramic capacitor to VSS close to pin for stable low-noise operation. |
| 6 | OUTB | Output of Channel B - independent output stage; shares VDD/VSS but has separate input pins for dual-channel signal processing. |
| 7 | INB− | Inverting input of Channel B - enables simultaneous amplification of two sensor signals (e.g., reference + active electrode). |
| 8 | INB+ | Noninverting input of Channel B - matches IN+ electrical characteristics; supports matched dual instrumentation front-ends. |
Key Features
| Feature | Design Value |
|---|---|
| Dual op amp architecture | Two fully independent amplifiers in one µMAX package - reduces board area and inter-channel crosstalk vs. discrete solutions. |
| Rail-to-rail output stage | Swings to within 25mV of VSS/VDD into 5kΩ - preserves full ADC input range in 1.8V systems without charge-pump rails. |
| No internal voltage reference | Omits 1.232V buffered reference - eliminates 1.1µA reference current and avoids reference noise coupling into sensitive analog paths. |
| Ultra-low input bias current | ≤100pA maximum - prevents voltage error across >10MΩ source impedances (e.g., glass pH electrodes). |
| Extended temperature range | –40°C to +125°C operation - qualified for automotive cabin sensors, industrial thermostats, and outdoor environmental monitors. |
Applications
| pH Meter Front-End | Portable Blood Glucose Sensor |
|---|---|
Use Scenario: Amplifying mV-level output from glass pH electrode in handheld field tester with single AAA battery. IC Role / Device Role / Timing Role: Dual-channel op amp providing high-input-impedance buffer (Channel A) and differential reference subtraction (Channel B). Use Value: ±100pA IB enables <0.01pH resolution; 25mV rail-to-rail swing maximizes 12-bit ADC utilization at 1.5V supply. | Use Scenario: Signal conditioning for amperometric glucose oxidase sensor in disposable test strip reader. IC Role / Device Role / Timing Role: Low-power transimpedance amplifier (Channel A) and reference voltage follower (Channel B) for ratiometric measurement. Use Value: 2.9µA total supply current extends coin-cell life to >2 years; 4kHz GBW supports fast strip insertion detection. |
| Remote Soil Moisture Node | Micropower Thermostat Controller |
Use Scenario: Battery-powered wireless node measuring capacitance shift in soil moisture probes every 15 minutes. IC Role / Device Role / Timing Role: Dual op amp configured as precision oscillator (Channel A) and comparator (Channel B) for RC decay timing. Use Value: 1.4V minimum supply allows operation until battery reaches 1.4V; no phase reversal prevents false triggers on overdriven inputs. | Use Scenario: Always-on temperature monitoring in HVAC duct sensor using thermistor bridge. IC Role / Device Role / Timing Role: Instrumentation amplifier front-end (dual op amp in difference configuration) driving low-power SAR ADC. Use Value: ±8mV VOS ensures <0.5°C accuracy over –40°C to +125°C; 73dB AVOL maintains linearity across 10kΩ–100kΩ bridge ranges. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual micropower op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX4038EUA | Same silicon, –40°C to +85°C temperature grade, identical pinout and electrical specs except wider VOS (±8mV vs. ±8mV) and higher IDD (3.1–4.0µA). | Not rated for automotive under-hood or industrial high-temp environments requiring +125°C operation. | Select MAX4038AAUA+ when extended temperature qualification and guaranteed 2.9–3.7µA IDD over –40°C to +125°C is mandatory. |
| LTC1540CMS8#PBF | Single micropower op amp + reference (1.182V), 1µA supply current, 6-pin MSOP; no dual-channel capability or rail-to-rail output. | Requires two devices and external reference routing for dual-channel use; unsuitable for space-constrained dual-sensor designs. | Choose only if single-channel + integrated reference is preferred and board area allows second IC. |
Compared with MAX4038EUA, the MAX4038AAUA+ guarantees tighter supply current control and full industrial temperature operation; versus LTC1540, it provides true dual-channel functionality and rail-to-rail output without sacrificing micropower performance.
Availability
The MAX4038AAUA+ is available at Aetrix Electronics and suitable for portable medical instrumentation, remote environmental sensors, and micropower thermostat controllers requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for MAX4038AAUA+ 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, medical, and communications applications.
The MAX4036–MAX4039 family was engineered specifically for ultra-low-power, low-voltage sensor signal conditioning - delivering rail-to-rail operation, sub-100pA input bias, and 1.4V startup in compact packages like µMAX and UCSP.
FAQ
What is the minimum supply voltage for reliable operation of the MAX4038AAUA+?
The MAX4038AAUA+ operates reliably down to +1.4V supply voltage, as confirmed in the Absolute Maximum Ratings and Electrical Characteristics tables. At 1.4V, it maintains rail-to-rail output swing, 2.9µA supply current, and full functionality across its –40°C to +125°C temperature range - making it ideal for deeply discharged single-cell Li+ or two-cell alkaline systems.
Does the MAX4038AAUA+ include an integrated voltage reference?
No, the MAX4038AAUA+ does not include an integrated voltage reference. Unlike the MAX4037/MAX4039 variants, it is a dual op amp-only device. This eliminates the 1.1µA reference supply current and associated reference noise, simplifying designs where external reference control or absence of reference is required.
What is the guaranteed input bias current specification for the MAX4038AAUA+ over temperature?
The MAX4038AAUA+ guarantees input bias current of ±100pA maximum over its full operating temperature range of –40°C to +125°C, as specified in the Electrical Characteristics table under "Input Bias Current" (IB). This enables accurate amplification of signals from ultra-high-impedance sources like pH electrodes and piezoresistive sensors.
Can the MAX4038AAUA+ drive a 5000pF capacitive load stably?
Yes, the MAX4038AAUA+ is unity-gain stable and supports capacitive loads up to 5000pF without external compensation, as stated in the "Capacitive-Load Stability" parameter (CLOAD = 5000pF). This eliminates need for isolation resistors in typical sensor interface applications with long traces or ADC input capacitance.
Is the MAX4038AAUA+ pin-compatible with other MAX4038 variants in the µMAX package?
Yes, the MAX4038AAUA+ shares identical pinout and footprint with MAX4038EUA (–40°C to +85°C grade) in the 8-pin µMAX package, as confirmed by the Pin Configurations section and Selector Guide. Both use the same top-marking layout and mechanical dimensions, enabling drop-in replacement where temperature grade permits.
MAX4038AAUA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 2
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 0.004V/µs
- Gain Bandwidth Product:
- 4 kHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 1 pA
- Voltage - Input Offset:
- 200 µV
- Current - Supply:
- 1.9µA (x2 Channels)
- Current - Output / Channel:
- 13 mA
- Voltage - Supply Span (Min):
- 1.4 V
- Voltage - Supply Span (Max):
- 3.6 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-uMAX/uSOP
MAX4038AAUA+ FAQ
1.How can I place an order for MAX4038AAUA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4038AAUA+ 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 MAX4038AAUA+ reliable?
The price and inventory of MAX4038AAUA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4038AAUA+ is usually 5 days.
3.What payment methods are accepted for MAX4038AAUA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4038AAUA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4038AAUA+?
MAX4038AAUA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4038AAUA+ 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 MAX4038AAUA+?
For technical support, including MAX4038AAUA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4038AAUA+ requirements.
6.How does Aetrix verify that MAX4038AAUA+ is sourced from the original manufacturer or authorized distributors?
All MAX4038AAUA+ 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 MAX4038AAUA+ meets industry standards.
7.What is the process for return or replacement of MAX4038AAUA+?
All MAX4038AAUA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX4038AAUA+, 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 MAX4038AAUA+ part is unused and in its original packaging.
Return procedure for MAX4038AAUA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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