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Analog Devices Inc./Maxim Integrated MAX4038EUA
- Part No.:
- MAX4038EUA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX4038EUA.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:2,650
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Product details
Overview
The MAX4038EUA from Maxim Integrated is a dual, rail-to-rail output operational amplifier with no integrated voltage reference, operating from a single +1.4V to +3.6V supply while consuming only 2.9µA (typ) total supply current at VDD = 1.4V and 3.2µA (typ) at VDD = 3.6V. It features ultra-low input bias current (±1.0pA typ), 200µV typical input offset voltage, and rail-to-rail output swing within 25mV of the rails into 5kΩ loads - enabling precision signal conditioning in micropower, single-cell Li+ or two-cell alkaline/NiMH battery-powered systems.
For engineers reviewing the MAX4038EUA datasheet, MAX4038EUA pinout, MAX4038EUA application, or MAX4038EUA equivalent, this page delivers verified specifications, µMAX package terminal mapping, real-world use cases in portable medical instrumentation and remote sensor amplification, and validated alternative options for low-voltage, ultra-low-power op amp selection.
Technical Context
The MAX4038EUA implements a BiCMOS input stage optimized for sub-1µA quiescent current operation, supporting common-mode input voltage down to VSS and up to VDD − 0.4V at 1.4V supply. Its unity-gain stable architecture delivers 4kHz gain-bandwidth product and 90° phase margin, with rail-to-rail output drive capability into resistive and capacitive loads up to 5000pF without external compensation.
Unlike the MAX4037/MAX4039 variants, the MAX4038EUA omits the 1.232V buffered reference - eliminating reference load regulation, line regulation, and reference noise parameters. Its dual-amplifier topology shares a common VDD and VSS rail, with independent IN+/IN−/OUT pairs per channel and no internal cross-coupling beyond specified crosstalk (−60dB at 1kHz).
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) or two alkaline/NiMH cells (2.0–3.2V fresh), with guaranteed functionality down to 1.4V. |
| Total Supply Current | 2.9µA (typ) at 1.4V, 3.2µA (typ) at 3.6V - supports >10-year battery life in always-on sensor nodes drawing <1µA average system current. |
| Input Bias Current | ±1.0pA (typ) - preserves signal integrity in high-impedance pH meter, electrometer, or potentiostat front-ends without significant DC error. |
| Input Offset Voltage | ±0.2mV (typ), ±8mV (max over temp) - enables accurate DC-coupled amplification of µV-level sensor outputs without trimming. |
| Rail-to-Rail Output Swing | Within 25mV of VDD/VSS into 5kΩ - delivers full dynamic range at low supply voltages, critical for ADC input driving with minimal headroom loss. |
| Gain-Bandwidth Product | 4kHz - sufficient for DC–1kHz sensor signal conditioning (e.g., thermistor, strain gauge, ECG front-end) with stable unity-gain configuration. |
| Capacitive Load Stability | Stable with up to 5000pF - eliminates need for isolation resistors when driving long traces, ADC input caps, or RF filter networks. |
Pinout & Package
The MAX4038EUA is housed in an 8-pin µMAX package (3mm × 3mm × 0.8mm), RoHS-compliant, with exposed paddle electrically isolated (not internally connected to VSS in µMAX variant).
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | IN+ | Noninverting input of Channel A - high-impedance node requiring guarded layout to preserve pA-level bias current performance. |
| 2 | VSS | Negative power-supply rail - must be low-impedance ground plane connection; shared return for both amplifiers and reference-free operation. |
| 3 | IN− | Inverting input of Channel A - used for closed-loop feedback or differential sensing; sensitive to PCB leakage paths. |
| 4 | OUT | Output of Channel A - rail-to-rail capable; drives 5kΩ load to within 25mV of VDD/VSS; stable with 5000pF capacitive load. |
| 5 | VDD | Positive power-supply rail - bypass with 0.1µF ceramic capacitor to VSS close to pin for noise immunity. |
| 6 | OUTB | Output of Channel B - independent output stage; crosstalk to Channel A is −60dB at 1kHz, enabling dual-channel signal processing. |
| 7 | INB− | Inverting input of Channel B - electrically isolated from Channel A inputs; supports separate feedback networks. |
| 8 | INB+ | Noninverting input of Channel B - identical electrical characteristics to IN+; allows simultaneous dual-sensor amplification. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low 800nA per amplifier supply current | Enables dual-op-amp functionality at <3.2µA total, extending battery life in compact, energy-constrained devices like active badges or wireless sensors. |
| Rail-to-rail output driving 5kΩ and 5000pF | Eliminates level-shifting circuitry and external buffers when interfacing with SAR or delta-sigma ADCs with capacitive sampling inputs. |
| No phase reversal on overdriven inputs | Prevents latch-up or erroneous output states during transient input excursions beyond common-mode range - critical in unattended monitoring systems. |
| Low 1.0pA (typ) input bias current | Maintains accuracy in high-Z applications (e.g., glass pH electrodes, piezoelectric sensors) without requiring guard rings or T-network compensation. |
| Unity-gain stable with no external compensation | Simplifies design for gain-of-1 configurations (e.g., voltage followers, active filters) without stability risk from parasitic capacitance or layout variations. |
Applications
| Portable Medical Instrumentation | Remote Sensor Amplifiers |
|---|---|
Use Scenario: Amplifying low-amplitude bio-signals (e.g., ECG, EMG) from dry-electrode wearable patches powered by coin-cell batteries. IC Role / Device Role: Dual-channel, DC-coupled instrumentation amplifier front-end with matched gain and offset for differential signal acquisition. Use Value: 200µV offset and 1pA bias current minimize baseline drift and electrode polarization errors, preserving diagnostic fidelity over multi-day wear. | Use Scenario: Signal conditioning for distributed environmental sensors (temperature, humidity, gas) transmitting data via LoRaWAN or NB-IoT. IC Role / Device Role: Low-power transducer interface amplifier converting mV-level bridge or thermistor outputs to ADC-compatible levels. Use Value: 1.4V minimum supply and 3.2µA max IDD allow operation directly from harvested solar or thermal energy, eliminating primary battery dependency. |
| Micropower Thermostats | pH Meters |
Use Scenario: Precision temperature sensing in HVAC control units using NTC thermistors, with wake-on-event operation and years-long battery life. IC Role / Device Role: High-impedance buffer and gain stage for thermistor voltage divider, feeding low-power microcontroller ADC. Use Value: Rail-to-rail output ensures full ADC code utilization across 1.4–3.6V supply range, maintaining resolution as battery discharges from 3.0V to 1.6V. | Use Scenario: Laboratory-grade handheld pH meters using glass electrodes with impedance >100MΩ and output signals <±500mV. IC Role / Device Role: Electrometer-grade input buffer isolating high-Z electrode from subsequent signal chain and ADC. Use Value: 1.0pA input bias current prevents electrode polarization and measurement drift, enabling stable ±0.01pH accuracy without frequent recalibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual, ultra-low-power op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX4038ETA-T | Identical electrical specs and pinout; differs only in TDFN-EP package (3×3mm, exposed paddle tied to VSS) vs. µMAX. | TDFN offers better thermal performance (1951mW max dissipation) and smaller footprint but requires soldering exposed pad to VSS. | Select MAX4038ETA-T for space-constrained PCBs needing enhanced thermal management; MAX4038EUA preferred for legacy µMAX land patterns. |
| LTC1540CMS8#PBF | Single 1.2µA op amp + comparator + reference; no dual-amplifier function; higher VOS (±1.5mV); 2.7–10V supply range. | Not suitable for dual-channel signal paths; requires external reference for precision; limited to >2.7V systems. | Choose only if system needs integrated comparator/reference and can accept single-channel operation and higher supply voltage floor. |
Compared with MAX4038ETA-T, the MAX4038EUA provides identical analog performance in a drop-in compatible µMAX footprint, while the LTC1540CMS8#PBF trades dual amplification for mixed-signal integration at higher voltage and lower precision - making MAX4038EUA optimal for dual, sub-3.6V, pA-bias applications.
Availability
MAX4038EUA is available at Aetrix Electronics and suitable for portable medical instrumentation, remote sensor amplifiers, and micropower thermostats requiring stable component supply across extended production lifecycles.
Supply support for MAX4038EUA 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 signal conditioning in battery-constrained systems - delivering rail-to-rail operation, picoampere input bias, and microwatt supply current without sacrificing DC accuracy or stability.
FAQ
What is the maximum supply voltage for the MAX4038EUA?
The MAX4038EUA supports a maximum supply voltage of +3.6V, with absolute maximum rating of +4.0V between VDD and VSS. Operation above 3.6V is not guaranteed and may degrade parametric performance or reliability. The device is optimized for 1.4V to 3.6V single-supply operation, making it ideal for single-cell lithium-ion or two-cell alkaline/NiMH battery systems where voltage decays from ~3.0V to ~1.6V.
Does the MAX4038EUA include an integrated voltage reference?
No, the MAX4038EUA does not include an integrated voltage reference. It is the dual-amplifier-only variant in the MAX4036–MAX4039 family. Unlike the MAX4037 (single op amp + reference) or MAX4039 (dual op amp + reference), the MAX4038EUA omits the 1.232V buffered reference output entirely - simplifying the die, reducing supply current, and eliminating reference-related specifications such as line/load regulation and reference noise.
What is the input common-mode voltage range of the MAX4038EUA at 1.4V supply?
At VDD = +1.4V, the MAX4038EUA guarantees an input common-mode voltage range from VSS (0V) to VDD − 0.4V (1.0V). This specification is explicitly confirmed in the Electrical Characteristics table for MAX4036/MAX4038 under "Input Common-Mode Voltage Range" with VDD = 1.4V. Full rail-to-rail input operation is possible above 3.0V supply but with degraded CMRR and PSRR performance.
Can the MAX4038EUA drive a 100kΩ load rail-to-rail?
Yes, the MAX4038EUA drives a 100kΩ load to within 2–5mV of the rails (VDD and VSS) under typical conditions, as specified in the "Output Voltage Swing High/Low" parameters. This superior performance relative to the 5kΩ load case (25–50mV swing) makes it well-suited for high-impedance interfaces such as ADC sample-and-hold inputs or FET gate drivers where loading must be minimized.
Is the MAX4038EUA unity-gain stable with capacitive loads?
Yes, the MAX4038EUA is unity-gain stable and remains stable with capacitive loads up to 5000pF, as confirmed in the "Capacitive-Load Stability" specification. No external compensation or isolation resistor is required for stability - a key advantage for driving ADC input capacitors, long PCB traces, or RF filtering networks without degrading bandwidth or introducing phase shift.
MAX4038EUA 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:
- 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
- Current - Output / Channel:
- 13 mA
- Voltage - Supply Span (Min):
- 1.4 V
- Voltage - Supply Span (Max):
- 3.6 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-uMAX/uSOP
MAX4038EUA FAQ
1.How can I place an order for MAX4038EUA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4038EUA 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 MAX4038EUA reliable?
The price and inventory of MAX4038EUA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4038EUA is usually 5 days.
3.What payment methods are accepted for MAX4038EUA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4038EUA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4038EUA?
MAX4038EUA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4038EUA 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 MAX4038EUA?
For technical support, including MAX4038EUA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4038EUA requirements.
6.How does Aetrix verify that MAX4038EUA is sourced from the original manufacturer or authorized distributors?
All MAX4038EUA 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 MAX4038EUA meets industry standards.
7.What is the process for return or replacement of MAX4038EUA?
All MAX4038EUA units undergo pre-shipment inspection (PSI). If there is an issue with MAX4038EUA, 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 MAX4038EUA part is unused and in its original packaging.
Return procedure for MAX4038EUA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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