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Analog Devices Inc./Maxim Integrated MAX6194AESA
- Part No.:
- MAX6194AESA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX6194AESA.pdf
- Description:
- IC VREF SERIES 0.04% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,662
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Product details
Overview
MAX6194AESA from Maxim Integrated is a precision, micropower, low-dropout series voltage reference delivering 4.500V output with ±2mV initial accuracy, 5ppm/°C max temperature coefficient, and 35µA max quiescent current - designed for high-accuracy ADC/DAC biasing in battery-powered instrumentation and industrial process control systems.
For engineers reviewing the MAX6194AESA datasheet, MAX6194AESA pinout, MAX6194AESA application, or MAX6194AESA equivalent, this page provides verified specifications, SO-8 package details, load-regulation behavior at 500µA, dropout performance (100mV at full load), and validated alternatives for precision analog signal chains requiring stable 4.5V reference rails.
Technical Context
This device is a series-mode bandgap voltage reference using proprietary curvature-correction circuitry and laser-trimmed thin-film resistors to achieve <5ppm/°C temperature coefficient and ±2mV initial accuracy over –40°C to +85°C. It operates as a two-terminal active reference with IN and OUT pins, sourcing/sinking up to ±500µA while maintaining regulation.
Internally compensated for stability with capacitive loads up to 2.2nF, it exhibits 0.16µV/µA load regulation and 25µV/V line regulation - enabling fast settling (180µs to 0.1%) and low-noise operation (215µVRMS, 10Hz–10kHz) without external compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 4.500V ±2mV (guaranteed initial tolerance at +25°C) |
| Temp Coefficient | ≤5ppm/°C (max drift over –40°C to +85°C; enables <0.3mV total drift) |
| Quiescent Current | ≤35µA (ultra-low power draw; ideal for multi-year battery operation) |
| Dropout Voltage | 100mV at 500µA load (enables operation from 4.6V supply in 4.5V systems) |
| Load Regulation | 0.16µV/µA (output shift ≤80µV across full ±500µA load range) |
| Line Regulation | 25µV/V (output shift ≤250µV over full input voltage range) |
| Noise (10Hz–10kHz) | 215µVRMS (low-noise performance critical for 16-bit+ data converters) |
Pinout & Package
MAX6194AESA is housed in an 8-pin SO (Small Outline) package with RoHS-compliant lead finish. Pins 1, 3, 5, 7, and 8 are No Connect (N.C.) - not internally bonded. GND (Pin 4) serves as the reference ground return; IN (Pin 2) accepts input supply; OUT (Pin 6) delivers the regulated 4.500V reference voltage.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1, 3, 5, 7, 8 | No Connection (N.C.) | Not internally connected; must remain unconnected on PCB |
| Pin 2 | IN | Supply input terminal; requires ≥4.6V for full 500µA load capability |
| Pin 4 | GND | Analog ground reference; must be low-impedance connection to system ground plane |
| Pin 6 | OUT | Regulated 4.500V output; capable of sourcing/sinking ±500µA with <100mV dropout |
Key Features
| Feature | Design Value |
|---|---|
| Initial Accuracy | ±2mV (0.044% of 4.5V) - eliminates need for system-level calibration in portable test gear |
| Temperature Stability | ≤5ppm/°C - ensures <0.3mV total drift across industrial temperature range |
| Capacitive Load Stability | Stable with 0–2.2nF output capacitance - supports direct connection to ADC sample capacitors without oscillation |
| Low Dropout Operation | 100mV at 500µA - enables use with Li-ion batteries down to 3.6V when paired with LDO pre-regulator |
| Supply Immunity | 0.8µA/V supply current variation - maintains constant quiescent draw across input voltage changes |
Applications
| Hand-Held Instruments | Analog-to-Digital Converters |
|---|---|
Use Scenario: Portable multimeters and handheld oscilloscopes requiring long battery life and stable reference under varying ambient temperatures. IC Role / Device Role / Timing Role: Primary voltage reference for 16-bit SAR ADCs and precision DACs used in measurement front-ends. Use Value: ±2mV initial accuracy and 5ppm/°C drift ensure calibrated readings remain within spec over full operating range without recalibration. |
Use Scenario: High-resolution data acquisition systems in industrial PLCs where ADC reference stability directly impacts measurement repeatability. IC Role / Device Role / Timing Role: Reference source for successive-approximation and sigma-delta ADCs sampling sensor signals at 100kSPS. Use Value: 215µVRMS broadband noise and 0.16µV/µA load regulation minimize code spread and improve effective resolution. |
| Industrial Process Control | Precision 4.5V Systems |
Use Scenario: Loop-powered 4–20mA transmitters operating from 12–24V supplies with tight thermal constraints in control cabinets. IC Role / Device Role / Timing Role: Stable excitation reference for bridge sensors and RTD interfaces feeding isolated ADCs. Use Value: 35µA quiescent current minimizes self-heating error; 100mV dropout allows efficient use of local 4.6V rail derived from buck converter. |
Use Scenario: FPGA I/O bank biasing and precision op-amp gain-setting networks requiring exact 4.5V reference in mixed-signal SoM designs. IC Role / Device Role / Timing Role: Fixed-voltage reference for voltage-controlled amplifiers and programmable gain stages. Use Value: Guaranteed 4.500V ±2mV output eliminates trimming resistors; SO-8 footprint simplifies layout in space-constrained modules. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF5045IDR | 4.5V output, 3ppm/°C max tempco, 950µA quiescent current, SO-8 package | Higher power consumption; better tempco but unsuitable for battery-powered devices | Select REF5045IDR only when ultra-low drift (<3ppm/°C) outweighs power budget constraints |
| ADR4545BRZ | 4.5V output, 3ppm/°C max tempco, 950µA quiescent current, SO-8 package, higher initial accuracy (±0.02%) | Requires >5V supply; incompatible with sub-5V battery rails due to 400mV dropout | Choose ADR4545BRZ for mains-powered lab equipment needing tighter initial tolerance and lower drift |
Compared with REF5045IDR and ADR4545BRZ, MAX6194AESA offers the lowest quiescent current (35µA vs. >900µA) and smallest dropout (100mV vs. >400mV), making it uniquely suitable for energy-constrained 4.5V systems where power efficiency and supply headroom are critical design parameters.
Availability
MAX6194AESA is available at Aetrix Electronics and suitable for hand-held instruments, analog-to-digital converters, and industrial process control systems requiring stable component supply with guaranteed long-term availability.
Supply support for MAX6194AESA 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 high-performance analog and mixed-signal ICs for precision, power, and interface applications.
The MAX6190–MAX6195/MAX6198 family was engineered specifically for micropower, low-drift voltage referencing in portable and industrial instrumentation - prioritizing ultra-low quiescent current, low dropout, and robust capacitive-load stability.
FAQ
What is the maximum load current supported by MAX6194AESA while maintaining regulation?
MAX6194AESA can source and sink up to ±500µA while maintaining output regulation within specified limits. At 500µA load, the dropout voltage is guaranteed ≤100mV, meaning the input voltage must be ≥4.6V to sustain 4.500V output. This capability supports direct driving of ADC reference inputs and precision op-amp bias networks without external buffers.
Does MAX6194AESA require an output capacitor for stability?
No, MAX6194AESA is internally compensated and stable with output capacitance ranging from 0 to 2.2nF. Unlike many references, it does not require a minimum output capacitor for phase margin. However, adding a small ceramic capacitor (e.g., 100pF) can improve transient response during rapid load steps - particularly useful in multiplexed ADC applications.
What is the guaranteed temperature coefficient specification for MAX6194AESA?
MAX6194AESA has a guaranteed maximum temperature coefficient of 5ppm/°C over the full operating range of –40°C to +85°C. This is measured using the "box" method (maximum ΔVOUT divided by maximum Δt) and ensures total output drift remains below ±0.3mV across the temperature range - critical for uncalibrated field instruments.
Can MAX6194AESA operate from a 3.7V lithium-ion battery?
No - MAX6194AESA requires a minimum input voltage of VOUT + 0.2V = 4.7V to guarantee regulation at full 500µA load. With typical 3.7V Li-ion discharge range (4.2V–3.0V), direct operation is not possible. A boost converter or LDO pre-regulator generating ≥4.6V is required to use MAX6194AESA in single-cell battery systems.
How does the supply current of MAX6194AESA vary with input voltage?
MAX6194AESA exhibits exceptional supply current stability: quiescent current is ≤35µA maximum, with variation limited to 0.8µA/V across its input voltage range (4.7V to 12.6V). This near-constant draw - unlike shunt references whose current scales with supply voltage - maximizes battery life and simplifies power budgeting in variable-supply systems.
MAX6194AESA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Obsolete
- Reference Type:
- Series
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 4.5V
- Voltage - Output (Max):
- -
- Current - Output:
- 500 µA
- Tolerance:
- ±0.04%
- Temperature Coefficient:
- 5ppm/°C
- Noise - 0.1Hz to 10Hz:
- 110µVp-p
- Noise - 10Hz to 10kHz:
- 215µVrms
- Voltage - Input:
- 4.7V ~ 12.6V
- Current - Supply:
- 35µA
- Current - Cathode:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX6194AESA FAQ
1.How can I place an order for MAX6194AESA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6194AESA 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 MAX6194AESA reliable?
The price and inventory of MAX6194AESA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6194AESA is usually 5 days.
3.What payment methods are accepted for MAX6194AESA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6194AESA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6194AESA?
MAX6194AESA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6194AESA 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 MAX6194AESA?
For technical support, including MAX6194AESA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6194AESA requirements.
6.How does Aetrix verify that MAX6194AESA is sourced from the original manufacturer or authorized distributors?
All MAX6194AESA 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 MAX6194AESA meets industry standards.
7.What is the process for return or replacement of MAX6194AESA?
All MAX6194AESA units undergo pre-shipment inspection (PSI). If there is an issue with MAX6194AESA, 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 MAX6194AESA part is unused and in its original packaging.
Return procedure for MAX6194AESA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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