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Analog Devices Inc./Maxim Integrated MAX6043CAUT25
- Part No.:
- MAX6043CAUT25
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- SOT-23-6
- Datasheet:
-
MAX6043CAUT25.pdf
- Description:
- VOLTAGE REFERENCE
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
MAX6043CAUT25 from Maxim Integrated is a precision 2.5V voltage reference IC using bandgap technology, delivering ±0.5% initial accuracy, 65ppm/°C max temperature coefficient, and 4µVP-P (0.1Hz–10Hz) output noise - optimized for high-resolution ADC/DAC biasing in automotive-grade systems operating from −40°C to +125°C.
For engineers reviewing the MAX6043CAUT25 datasheet, MAX6043CAUT25 pinout, MAX6043CAUT25 application, or MAX6043CAUT25 equivalent, this page provides verified technical context, SOT23 package mapping, load regulation behavior (70 ppm/mA sourcing), stability with 0–100µF capacitive loads, and validated alternatives for cost- or performance-sensitive designs.
Technical Context
The MAX6043CAUT25 implements curvature-corrected bandgap architecture with laser-trimmed thin-film resistors to achieve stable 2.5V output across −40°C to +125°C. It operates from 4.5V to 40V input while drawing only 320–650µA quiescent current, enabling use in wide-input industrial and automotive power rails.
Its dual-output Kelvin configuration (OUTF/OUTS) eliminates lead resistance error in precision sensing, and internal short-circuit protection limits output current to 60mA. No external bypass capacitor is required for stability - a key differentiator versus legacy references requiring ≥1µF output capacitance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.500V ±0.5% (±12.5mV) at +25°C - defines absolute accuracy floor for 12-bit+ converter full-scale calibration. |
| Tempco | 65ppm/°C max over −40°C to +125°C - corresponds to ±19.5mV drift across full range, limiting 16-bit converter error to <1 LSB. |
| Load Regulation | 70 ppm/mA (sourcing, 0–10mA) - translates to ±0.175mV/mA shift, critical for dynamic load applications like multiplexed sensor front-ends. |
| Output Noise | 4µVP-P (0.1Hz–10Hz), 7µVRMS (10Hz–1kHz) - enables sub-LSB noise contribution in 20-bit SAR ADC reference paths. |
| Supply Current | 320µA typ / 650µA max (−40°C to +125°C) - supports >10-year battery life in low-power data loggers with 2.2Ah coin cells. |
| Capacitive Load Stability | Stable with 0–100µF output capacitance - eliminates need for output bypass cap, saving PCB area in space-constrained modules. |
| Line Regulation | 10 ppm/V max (−40°C to +125°C) - ensures <±0.25mV variation over 4.5–40V input swing, suitable for unregulated battery or bus inputs. |
Pinout & Package
MAX6043CAUT25 is housed in a RoHS-compliant 6-pin SOT23 package (package code U6F+6, outline 21-0058), with thermal resistance θJA = 134.4°C/W on four-layer board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 3 | I.C. | Internally connected - must remain unconnected externally; no routing or copper pour allowed. |
| 2 | GND | Analog ground reference - requires low-impedance connection to system AGND plane to minimize noise coupling. |
| 4 | IN | Positive supply input - accepts 4.5V to 40V; decoupling with 0.1µF ceramic capacitor recommended near pin. |
| 5 | OUTF | Force output - drives load directly; connect to OUTS within 1mm for Kelvin sensing accuracy. |
| 6 | OUTS | Sense input - returns feedback to internal error amplifier; must tie to OUTF close to device to cancel trace resistance. |
Key Features
| Feature | Design Value |
|---|---|
| Kelvin force-sense outputs (OUTF/OUTS) | Eliminates voltage drop error from PCB trace resistance up to 1Ω, preserving ±0.5% accuracy under layout variation. |
| No output bypass capacitor required | Reduces BOM count and PCB footprint by removing mandatory 1–10µF ceramic cap, simplifying layout in dense analog sections. |
| Short-circuit protected (60mA limit) | Prevents latch-up or damage during test, probe contact, or accidental wiring faults - supports robust production handling. |
| Wide 4.5V–40V input range | Accepts direct connection to 12V/24V automotive buses or industrial 24/36V supplies without pre-regulation. |
| Automotive temperature grade (−40°C to +125°C) | Qualified per AEC-Q100 stress tests - suitable for engine control, ADAS sensor modules, and under-hood electronics. |
Applications
| Automotive Engine Control Unit (ECU) | Industrial Data Acquisition System |
|---|---|
Use Scenario: Providing stable 2.5V reference for 16-bit ADC sampling of oxygen sensor, throttle position, and knock sensor signals under wide ambient and supply-voltage variation. IC Role / Device Role / Timing Role: Precision voltage reference establishing absolute scaling for analog-to-digital conversion - not a timing or clocking function. Use Value: 65ppm/°C tempco ensures <±1 LSB error over −40°C to +125°C, meeting ASAM MCD-2 MC functional safety requirements for sensor signal chain integrity. |
Use Scenario: Biasing high-resolution sigma-delta ADCs in programmable logic controller (PLC) analog input modules measuring 4–20mA loop currents and thermocouple voltages. IC Role / Device Role / Timing Role: Primary reference source for multi-channel simultaneous sampling - maintains channel-to-channel gain matching. Use Value: 4µVP-P low-frequency noise prevents baseline drift in 10-second integration measurements, improving repeatability of temperature readings. |
| Portable Medical Instrumentation | Battery-Powered Environmental Sensor Node |
Use Scenario: Supplying reference voltage for ECG front-end ADCs in handheld patient monitors where low power and long-term stability are critical. IC Role / Device Role / Timing Role: Low-noise, low-drift reference enabling accurate measurement of microvolt-level cardiac signals. Use Value: 150ppm thermal hysteresis and 150ppm long-term drift (1000hr) ensure calibration validity between biannual service intervals. |
Use Scenario: Powering 12-bit ADC in solar-powered soil moisture and air quality nodes deployed in remote locations for >5 years. IC Role / Device Role / Timing Role: Ultra-low-quiescent-current reference minimizing standby power draw in intermittent-sampling operation. Use Value: 320µA typical supply current extends 2.2Ah Li-SOCl₂ battery life to >12 years at 1-sample/hour duty cycle. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6029AAUT25#TG16 | 0.06% initial accuracy, 15ppm/°C tempco, same SOT23-6 package, but 100µA lower quiescent current (220µA typ). | Higher accuracy and lower drift - suited for 18-bit+ metrology-grade instruments where MAX6043CAUT25's 0.5% tolerance is insufficient. | Select when tighter initial accuracy and lower tempco justify higher unit cost and reduced sourcing flexibility. |
| ADR3425ARJZ-R7 | 0.1% initial accuracy, 30ppm/°C tempco, 300µA quiescent current, same 2.5V output, SOT23-6 package. | Moderate accuracy/stability trade-off - offers better tempco than MAX6043CAUT25 but looser initial tolerance than MAX6029. | Choose for cost-sensitive industrial sensors needing better drift performance than MAX6043CAUT25 but without premium pricing of MAX6029. |
Compared with MAX6043CAUT25, MAX6029AAUT25#TG16 delivers 8× tighter initial accuracy and 4.3× lower tempco at higher cost, while ADR3425ARJZ-R7 provides intermediate drift performance with broader distributor availability - enabling tiered design-in based on accuracy budget and supply-chain constraints.
Availability
MAX6043CAUT25 is available at Aetrix Electronics and suitable for automotive ECU designs, industrial PLC analog modules, portable medical instrumentation, and battery-powered environmental sensor nodes requiring stable component supply with guaranteed long-term continuity.
Supply support for MAX6043CAUT25 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 precision analog, mixed-signal, and power management ICs for demanding industrial, automotive, and medical applications.
The MAX6043 family was designed specifically for high-voltage, high-accuracy reference needs in space-constrained automotive and industrial systems - emphasizing Kelvin sensing, wide input range, and capacitor-free stability.
FAQ
What is the maximum capacitive load the MAX6043CAUT25 can drive while remaining stable?
The MAX6043CAUT25 is stable with capacitive loads ranging from 0µF to 100µF on its output. This eliminates the need for an external output bypass capacitor - a key advantage over many legacy references that require ≥1µF for phase margin. The stability holds across the full −40°C to +125°C temperature range and 4.5V–40V input voltage range, making it ideal for designs where board space or reliability under varying load conditions is critical. MAX6043CAUT25's internal compensation ensures consistent performance regardless of output capacitance value.
Does the MAX6043CAUT25 require an input bypass capacitor?
While not strictly required for stability, a 0.1µF ceramic capacitor placed as close as possible to the IN pin (pin 4) is recommended to improve line-transient response - especially in noisy environments like automotive power supplies or industrial motor drives. The MAX6043CAUT25 itself draws only 320µA quiescent current, so input ripple rejection relies partly on this local decoupling. Without it, fast input transients may couple into the reference output; with it, PSRR exceeds −60dB above 100Hz. MAX6043CAUT25's internal design tolerates open-input operation but benefits measurably from proper input filtering.
How does the Kelvin (OUTF/OUTS) configuration improve accuracy in the MAX6043CAUT25?
The MAX6043CAUT25 uses separate force (OUTF) and sense (OUTS) outputs to eliminate voltage drop errors caused by PCB trace resistance between the IC and load. By routing OUTF to the load and feeding OUTS back directly to the internal error amplifier, the device regulates voltage *at the sense point*, not at the die. This compensates for up to ~1Ω of series resistance - critical in high-precision applications like 16-bit ADC biasing where even 50mΩ trace resistance would introduce 0.02% gain error. MAX6043CAUT25's layout guidance specifies tying OUTF and OUTS within 1mm to maximize this benefit.
What is the short-circuit protection behavior of the MAX6043CAUT25?
When the MAX6043CAUT25 output is shorted to GND, its internal circuitry limits sink current to approximately 60mA, preventing thermal runaway or permanent damage. If shorted to the IN rail, it limits source current to −2mA. This protection activates within microseconds and sustains indefinitely - allowing safe handling during board testing, probing, or field wiring faults. After fault removal, the MAX6043CAUT25 resumes normal operation without reset or latch-up. This behavior is specified across −40°C to +125°C and is independent of input voltage within 4.5V–40V.
Can the MAX6043CAUT25 be used with a 3.3V supply?
No - the MAX6043CAUT25 requires a minimum input voltage of 4.5V to maintain regulation, as confirmed by its absolute maximum ratings and line regulation test conditions (4.5V ≤ VIN ≤ 40V). At 3.3V, the internal pass element cannot sustain 2.5V output due to dropout limitations. For 3.3V systems, consider the MAX6029AAUT25#TG16 (min VIN = 3.3V) or ADR3425 (min VIN = 2.7V). MAX6043CAUT25 is intended for higher-voltage rails such as 5V, 12V, or 24V automotive/industrial supplies.
MAX6043CAUT25 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- SOT-23-6
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Reference Type:
- Series
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- -
- Current - Output:
- 10 mA
- Tolerance:
- ±0.5%
- Temperature Coefficient:
- 65ppm/°C
- Noise - 0.1Hz to 10Hz:
- 4µVp-p
- Noise - 10Hz to 10kHz:
- 7µVrms
- Voltage - Input:
- 12V ~ 40V
- Current - Supply:
- 650µA
- Current - Cathode:
- -
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-6
MAX6043CAUT25 FAQ
1.How can I place an order for MAX6043CAUT25 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6043CAUT25 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 MAX6043CAUT25 reliable?
The price and inventory of MAX6043CAUT25 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6043CAUT25 is usually 5 days.
3.What payment methods are accepted for MAX6043CAUT25?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6043CAUT25 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6043CAUT25?
MAX6043CAUT25 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6043CAUT25 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 MAX6043CAUT25?
For technical support, including MAX6043CAUT25 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6043CAUT25 requirements.
6.How does Aetrix verify that MAX6043CAUT25 is sourced from the original manufacturer or authorized distributors?
All MAX6043CAUT25 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 MAX6043CAUT25 meets industry standards.
7.What is the process for return or replacement of MAX6043CAUT25?
All MAX6043CAUT25 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6043CAUT25, 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 MAX6043CAUT25 part is unused and in its original packaging.
Return procedure for MAX6043CAUT25:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX6043CAUT25 Tags
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