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Analog Devices Inc./Maxim Integrated MAX6161BESA+
- Part No.:
- MAX6161BESA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX6161BESA+.pdf
- Description:
- IC VREF SERIES 0.32% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,217
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Product details
Overview
MAX6161BESA+ from Maxim Integrated is a precision, low-dropout, micropower series voltage reference delivering 1.25V output with ±4mV initial accuracy and 6–15ppm/°C temperature coefficient over –40°C to +85°C. It operates from (VOUT + 200mV) to 12.6V, sources up to 4mA, sinks 2mA, and draws only 100–150μA quiescent current - ideal for high-accuracy ADC biasing in portable instrumentation.
For engineers reviewing the MAX6161BESA+ datasheet, MAX6161BESA+ pinout, MAX6161BESA+ application, or MAX6161BESA+ equivalent, key selection criteria include its 1.25V output tolerance, ultra-low supply-current variation (≤8μA/V), no-external-capacitor stability, 200mV max dropout at 1mA, and SO-8 package compatibility with space-constrained, battery-powered precision analog systems.
Technical Context
The MAX6161BESA+ is a three-terminal, internally compensated series-mode voltage reference using proprietary curvature correction and laser-trimmed thin-film resistors. Its BiCMOS process enables stable operation without external compensation capacitors while maintaining low noise (20µVp-p, 0.1Hz–10Hz) and high PSRR (80dB at 120Hz).
It features supply-voltage-independent quiescent current (100–150μA typ/max), minimal line regulation (12–150µV/V), and load regulation of 0.5–0.9mV/mA when sourcing - critical for maintaining reference integrity across varying input and load conditions in precision data acquisition.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.250V ±4mV at +25°C - ensures tight baseline for 12-bit+ ADC full-scale calibration |
| Temp Coefficient | 6–15ppm/°C max - limits drift to ≤188µV over –40°C to +85°C operating range |
| Quiescent Current | 100–150μA - enables >1-year battery life in 10μA-average-power handheld meters |
| Dropout Voltage | 200mV max at 1mA - supports operation from 1.45V supply, compatible with single Li-ion or dual alkaline cells |
| Load Regulation | 0.5–0.9mV/mA sourcing - maintains <±3.6mV error under full 4mA load variation |
| Noise (0.1–10Hz) | 20µVp-p - contributes <0.0016 LSB error in 16-bit, 2.5V-span SAR ADCs |
| PSRR | 80dB at 120Hz - suppresses ripple from switching regulators feeding the reference input |
Pinout & Package
MAX6161BESA+ is housed in an 8-pin SO (Small Outline) package with exposed pad not electrically connected. Pin 1, 3, 5, 7, and 8 are No Connect (N.C.); Pin 2 is IN (input voltage), Pin 4 is GND (ground reference), and Pin 6 is OUT (precision 1.25V output).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 2 (IN) | Input Supply Terminal | Accepts 1.45V–12.6V; requires no series resistor unlike shunt references |
| Pin 4 (GND) | Analog Ground Reference | Common return for input, output, and internal bandgap core - must be low-impedance |
| Pin 6 (OUT) | Precision Output Terminal | Delivers regulated 1.25V; stable with ≥1μF capacitive loads but needs no capacitor for stability |
| Pins 1,3,5,7,8 | No Connection | Not bonded or routed internally - may be left floating or tied to GND for mechanical rigidity |
Key Features
| Feature | Design Value |
|---|---|
| Laser-trimmed thin-film resistors | Enable ±4mV initial accuracy and 6–15ppm/°C tempco without post-package trimming |
| Proprietary curvature-correction circuit | Minimizes parabolic VOUT vs. T error - improves worst-case drift by >30% vs. standard bandgap |
| No external compensation capacitor required | Reduces BOM count and PCB area - eliminates capacitor-induced phase margin risk |
| Supply-current independence (≤8μA/V variation) | Ensures consistent power budget across input voltage swings - simplifies battery-life modeling |
| Stable with 1μF capacitive loads | Supports direct driving of ADC reference inputs and op-amp bias networks without isolation resistors |
Applications
| Portable Digital Multimeters (DMMs) | Handheld GPS Receivers |
|---|---|
Use Scenario: Precision 4½-digit DMM requiring stable 1.25V reference for autoranging ADC front-end and internal calibration. IC Role / Device Role / Timing Role: Primary voltage reference for SAR ADC and offset-null circuitry - directly sets measurement full-scale and zero-point accuracy. Use Value: ±4mV initial error and 15ppm/°C max tempco ensure <0.02% reading uncertainty over field temperature ranges without recalibration. | Use Scenario: Low-power GNSS baseband processor in compact handheld unit needing clean, stable reference for RF synthesizer PLL and ADC sampling clocks. IC Role / Device Role / Timing Role: Analog reference for LNA biasing and ADC reference voltage - critical for SNR preservation in weak-signal acquisition. Use Value: 20µVp-p low-frequency noise and 80dB PSRR prevent clock jitter increase and maintain C/N0 >45dB-Hz under noisy DC-DC supply conditions. |
| Industrial Data Loggers | Medical Patient Monitors |
Use Scenario: Battery-operated environmental sensor node logging temperature, pressure, and humidity with 16-bit resolution over multi-year deployments. IC Role / Device Role / Timing Role: Master reference for multiplexed sigma-delta ADC channels - shared across all analog front-ends to eliminate inter-channel gain mismatch. Use Value: 100μA quiescent current and 200mV dropout enable continuous operation from 1.5V coin cell for >2 years; long-term drift <115ppm/1000hr ensures calibration validity. | Use Scenario: Portable ECG module requiring ultra-stable reference for lead-off detection and analog front-end amplification with <1µV input-referred noise. IC Role / Device Role / Timing Role: Bias reference for instrumentation amplifiers and ADC reference - defines common-mode level and gain accuracy for biopotential signal chain. Use Value: 0.5mV/mA load regulation prevents baseline shift during dynamic electrode contact changes; hysteresis <125ppm avoids false arrhythmia alerts after thermal cycling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF191GSZ-REEL | 1.25V output, ±2mV initial accuracy, 3ppm/°C tempco, 100μA IQ, SO-8 - tighter accuracy/tempco but higher cost and lower sink current (1mA) | Better for metrology-grade calibrators where ±2mV and 3ppm/°C are mandatory; less suitable for high-sink-load sensor excitation | Select REF191GSZ-REEL when absolute initial accuracy and long-term stability outweigh cost and sink-current requirements |
| ADR3412ARJZ-R7 | 1.2V output, ±3mV initial accuracy, 10ppm/°C tempco, 120μA IQ, SOT-23-5 - smaller footprint, lower voltage, but requires external decoupling capacitor | Fits ultra-compact wearables; 1.2V output incompatible with 1.25V ADC reference rails without level-shifting | Choose ADR3412ARJZ-R7 only if board area is constrained and system can accommodate 1.2V reference and added capacitor |
Compared with REF191GSZ-REEL and ADR3412ARJZ-R7, MAX6161BESA+ offers the optimal balance of 1.25V compatibility, 4mA sourcing capability, and no-external-capacitor operation - making it uniquely suited for space-aware, battery-powered precision instruments where reference rail alignment and layout simplicity are critical.
Availability
MAX6161BESA+ is available at Aetrix Electronics and suitable for portable digital multimeters, handheld GPS receivers, industrial data loggers, medical patient monitors, and precision ADC subsystems requiring stable component supply with guaranteed long-term availability and RoHS-compliant packaging.
Supply support for MAX6161BESA+ 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 and mixed-signal ICs for demanding industrial, medical, and communications applications.
The MAX6161–MAX6168 family was engineered specifically for high-accuracy, low-power, space-constrained systems requiring stable voltage references without external compensation - targeting portable test equipment, battery-powered sensors, and precision data acquisition.
FAQ
What is the output voltage tolerance of the MAX6161BESA+ at room temperature?
The MAX6161BESA+ delivers a nominal 1.250V output with ±4mV initial accuracy at +25°C, meaning its actual output falls between 1.246V and 1.254V when measured under standard conditions before temperature cycling or long-term aging. This tolerance is specified per the manufacturer's electrical characteristics table and applies across the full -40°C to +85°C operating range.
Does the MAX6161BESA+ require an external output capacitor for stability?
No, the MAX6161BESA+ does not require an external output capacitor for stability due to internal compensation. It remains stable with capacitive loads up to 1μF and can operate with no output capacitor - a key advantage for space-constrained PCB layouts. An optional 0.1μF ceramic capacitor may be added at the IN pin for improved line-transient performance, but it is not needed for basic functionality.
What is the maximum load current the MAX6161BESA+ can source and sink?
The MAX6161BESA+ can source up to 4mA and sink up to 2mA of load current while maintaining specified output voltage accuracy and regulation. These values are explicitly stated in the General Description and confirmed in the Electrical Characteristics tables for the MAX6161 variant. Exceeding these limits may cause excessive dropout or deviation beyond the guaranteed tempco and load-regulation specs.
How does the supply current of the MAX6161BESA+ vary with input voltage?
The MAX6161BESA+ exhibits highly stable quiescent supply current: typical 100μA, maximum 150μA over the full operating temperature range, with variation limited to ≤8μA/V across its input voltage range (1.45V to 12.6V). This near-constant IQ behavior - unlike shunt references - simplifies power budgeting and extends battery life in variable-supply applications.
Is the MAX6161BESA+ pin-compatible with other devices in the MAX6161–MAX6168 family?
Yes, all members of the MAX6161–MAX6168 family, including MAX6161BESA+, share identical 8-pin SO package pinouts and terminal functions: Pin 2 = IN, Pin 4 = GND, Pin 6 = OUT, and Pins 1/3/5/7/8 = N.C. This allows drop-in replacement across output voltages (1.25V to 5.0V) and accuracy grades (A/B suffixes) without PCB redesign - provided the system's input voltage, load, and accuracy requirements are met for the selected variant.
MAX6161BESA+ 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:
- Active
- Reference Type:
- Series
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 1.25V
- Voltage - Output (Max):
- -
- Current - Output:
- 5 mA
- Tolerance:
- ±0.32%
- Temperature Coefficient:
- 15ppm/°C
- Noise - 0.1Hz to 10Hz:
- 20µVp-p
- Noise - 10Hz to 10kHz:
- 15µVrms
- Voltage - Input:
- 2.5V ~ 12.6V
- Current - Supply:
- 150µA
- Current - Cathode:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX6161BESA+ FAQ
1.How can I place an order for MAX6161BESA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6161BESA+ 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 MAX6161BESA+ reliable?
The price and inventory of MAX6161BESA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6161BESA+ is usually 5 days.
3.What payment methods are accepted for MAX6161BESA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6161BESA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6161BESA+?
MAX6161BESA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6161BESA+ 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 MAX6161BESA+?
For technical support, including MAX6161BESA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6161BESA+ requirements.
6.How does Aetrix verify that MAX6161BESA+ is sourced from the original manufacturer or authorized distributors?
All MAX6161BESA+ 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 MAX6161BESA+ meets industry standards.
7.What is the process for return or replacement of MAX6161BESA+?
All MAX6161BESA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6161BESA+, 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 MAX6161BESA+ part is unused and in its original packaging.
Return procedure for MAX6161BESA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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