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Analog Devices Inc./Maxim Integrated MAX6145ESA+
- Part No.:
- MAX6145ESA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX6145ESA+.pdf
- Description:
- IC VREF SERIES 1% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,068
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Product details
Overview
MAX6145ESA+ from Maxim Integrated is a precision 4.5V low-dropout three-terminal voltage reference IC in an 8-pin SO package, featuring ±1% initial accuracy, 15ppm/°C typical temperature coefficient, 200mV dropout voltage, and 79µA quiescent supply current. It operates from 4.7V to 12.6V input and delivers stable output for high-accuracy analog signal chains in portable instrumentation.
For engineers reviewing the MAX6145ESA+ datasheet, MAX6145ESA+ pinout, MAX6145ESA+ application, or MAX6145ESA+ equivalent, key selection criteria include guaranteed 50ppm/°C max tempco, load regulation of 0.6–1.8 mV/mA (sourcing), stability with up to 10nF capacitive loads, and compatibility with 3V/5V systems requiring micropower operation.
Technical Context
The MAX6145ESA+ implements a bandgap-based reference core with internal trimming for ±1% initial output accuracy at +25°C and maintains tight thermal stability via curvature-compensated architecture. Its 200mV dropout enables operation with VIN as low as 4.7V while sustaining 4.5V output under full load.
Supply current remains highly stable across input voltage (1.7–6 µA/V variation) and temperature (79–130 µA over –40°C to +85°C), eliminating battery-current waste common in two-terminal references. Output noise is specified at 30 µVP-P (0.1Hz–10Hz) and 800 µVP-P (10Hz–10kHz), supporting precision ADC/DAC biasing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 4.500 V ±0.045 V at +25°C; ±0.09 V over –40°C to +85°C - ensures stable bias for 12-bit+ data converters |
| Tempco | 15 ppm/°C typical, ≤50 ppm/°C max - limits drift to <±0.23 mV over full temperature range |
| Dropout Voltage | 200 mV at 1 mA load - allows use with 4.7V supply in 5V systems without headroom penalty |
| Quiescent Current | 79 µA at +25°C, ≤130 µA over temperature - extends battery life in always-on sensor nodes |
| Load Regulation | 0.6–1.8 mV/mA sourcing, 1.75–18 mV/mA sinking - maintains accuracy under dynamic DAC/ADC loading |
| Line Regulation | 2–50 µV/V - rejects supply ripple without external filtering in noisy environments |
| Noise (0.1–10 Hz) | 30 µVP-P - avoids introducing quantization error in low-frequency precision measurements |
Pinout & Package
MAX6145ESA+ is housed in an 8-pin SO (Small Outline) package with standard JEDEC MO-153 footprint. Pin 1 is marked by a beveled corner or dot; pins are numbered counterclockwise from pin 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | IN | Input voltage terminal; accepts 4.7V to 12.6V; requires local 0.1µF ceramic bypass for optimal line transient response |
| 2 | N.C. | No internal connection; must remain unconnected or grounded per layout best practice |
| 3 | N.C. | No internal connection; electrically isolated; no routing required |
| 4 | N.C. | No internal connection; unused pad; avoid solder bridging |
| 5 | OUT | Precision 4.5V reference output; stable with 0–10nF capacitive loads; drives ADC REF inputs directly |
| 6 | N.C. | No internal connection; floating node; leave unconnected |
| 7 | N.C. | No internal connection; not bonded; no electrical function |
| 8 | GND | Analog ground reference; must connect to clean system ground plane with low-inductance path |
Key Features
| Feature | Design Value |
|---|---|
| Low 200mV dropout | Enables reliable 4.5V output from 4.7V supplies - critical for single-cell Li-ion or regulated 5V rail margin |
| 79µA supply current | Virtually independent of input voltage - eliminates battery drain variation seen in shunt references |
| Stable with 0–10nF loads | Eliminates need for output capacitor - simplifies layout and avoids phase-margin risks in feedback paths |
| 15ppm/°C typical tempco | Reduces thermal drift contribution to <±0.000675 V/°C - supports <0.01% total error in industrial temperature ranges |
| ±1% initial accuracy | Minimizes calibration burden in factory programming - reduces test time and trim component count |
Applications
| Portable Data Loggers | Industrial Sensor Transmitters |
|---|---|
Use Scenario: Battery-powered environmental monitors logging temperature, humidity, and pressure over months on coin cells. IC Role / Device Role / Timing Role: Provides stable 4.5V reference for successive-approximation ADCs and low-power microcontroller VREF inputs. Use Value: 79µA quiescent current extends battery life beyond 5 years; 200mV dropout permits direct use of 4.7V boost converter output. | Use Scenario: 4–20mA loop-powered transmitters converting RTD or strain-gauge signals in process plants. IC Role / Device Role / Timing Role: Supplies excitation and reference voltage for precision instrumentation amplifiers and 16-bit DACs driving current loops. Use Value: ≤50ppm/°C tempco ensures <0.1% span error over –40°C to +85°C ambient - meets IEC 61298-2 Class 0.1 requirements. |
| Medical Patient Monitors | Test & Measurement Front Ends |
Use Scenario: Portable ECG and pulse oximetry units requiring FDA-grade signal integrity and low power. IC Role / Device Role / Timing Role: Reference source for anti-aliasing filters, programmable gain amplifiers, and SAR ADCs sampling biopotentials. Use Value: 30µVP-P (0.1–10Hz) noise prevents baseline wander masking low-amplitude physiological signals. | Use Scenario: Benchtop multimeters and oscilloscope front-end digitizers demanding sub-0.05% DC accuracy. IC Role / Device Role / Timing Role: Primary voltage reference for auto-ranging attenuators, offset calibration DACs, and high-resolution ADCs. Use Value: ±1% initial accuracy and thermal hysteresis <80ppm enable one-time factory calibration without periodic recalibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF43GS | 4.096V fixed output; 10ppm/°C max tempco; 1.2mA supply current; SO-8 package | Higher power, tighter tempco - suited for lab-grade equipment where accuracy outweighs battery life | Select REF43GS only when 4.096V matches ADC full-scale and system can support >1mA supply budget. |
| ADR3445 | 4.5V output; 10ppm/°C max tempco; 120µA supply current; SOT-23-5 package | Smaller footprint, lower noise (12µVP-P), but higher cost and limited 100mA output drive | Choose ADR3445 for space-constrained PCBs needing ultra-low noise, accepting premium pricing and reduced sourcing flexibility. |
Compared with REF43GS and ADR3445, the MAX6145ESA+ offers the lowest quiescent current (79µA) and highest output drive capability (1mA sourcing) in SO-8, making it optimal for battery-operated field instruments where size, cost, and power are jointly constrained.
Availability
MAX6145ESA+ is available at Aetrix Electronics and suitable for portable instrumentation, industrial sensor transmitters, and medical monitoring systems requiring stable component supply, long-lifecycle availability, and RoHS-compliant sourcing.
Supply support for MAX6145ESA+ 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 industrial, medical, and communications applications.
The MAX61xx family was engineered specifically for micropower, low-dropout voltage reference needs in battery-critical and thermally demanding systems - prioritizing supply independence, wide input range, and robust capacitive-load stability.
FAQ
What is the maximum input voltage rating for MAX6145ESA+?
The MAX6145ESA+ has an absolute maximum input voltage of +13.5V, but its specified operating range is 4.7V to 12.6V. Operation above 12.6V may degrade long-term reliability or cause parametric shift. For continuous operation, maintain VIN ≤12.6V; transient spikes must stay below +13.5V for ≤100ns. The MAX6145ESA+ is not rated for automotive load-dump conditions.
Does MAX6145ESA+ require an output capacitor for stability?
No, the MAX6145ESA+ is internally compensated and stable with capacitive loads from 0nF to 10nF. Adding an output capacitor is unnecessary and may degrade transient response or introduce peaking. If used for charge reservoir functions (e.g., decoupling a DAC input), ensure total load capacitance stays ≤10nF to preserve settling time performance.
What is the thermal hysteresis specification for MAX6145ESA+?
The MAX6145ESA+ exhibits ≤80ppm thermal hysteresis, measured after cycling between –40°C, +25°C, and +85°C. This value reflects residual output voltage shift due to mechanical stress relaxation in the die and package, and is included in the total error budget for high-accuracy calibration workflows. It is not temperature-dependent drift but a repeatable offset after thermal cycling.
Can MAX6145ESA+ be used in adjustable-output configurations?
No, the MAX6145ESA+ is a fixed 4.5V output device and lacks an ADJ pin. Only the MAX6160 variant supports adjustable output via external resistor dividers. Attempting to modify MAX6145ESA+ output using external feedback will not function - its internal topology is optimized for fixed-voltage regulation and does not provide access to the bandgap reference node.
What is the load regulation behavior of MAX6145ESA+ when sinking current?
When sinking up to 1mA, the MAX6145ESA+ exhibits load regulation of 1.75–18 mV/mA over temperature. This means output voltage decreases by up to 18mV per mA of sink current at worst-case conditions. For applications requiring bidirectional load handling (e.g., driving both sourcing and sinking DACs), verify that this deviation falls within system accuracy requirements - consider adding a buffer amplifier if tighter regulation is needed.
MAX6145ESA+ 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:
- 1 mA
- Tolerance:
- ±1%
- Temperature Coefficient:
- 50ppm/°C
- Noise - 0.1Hz to 10Hz:
- 30µVp-p
- Noise - 10Hz to 10kHz:
- 800µVp-p
- Voltage - Input:
- 4.7V ~ 12.6V
- Current - Supply:
- 130µA
- Current - Cathode:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX6145ESA+ FAQ
1.How can I place an order for MAX6145ESA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6145ESA+ 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 MAX6145ESA+ reliable?
The price and inventory of MAX6145ESA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6145ESA+ is usually 5 days.
3.What payment methods are accepted for MAX6145ESA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6145ESA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6145ESA+?
MAX6145ESA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6145ESA+ 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 MAX6145ESA+?
For technical support, including MAX6145ESA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6145ESA+ requirements.
6.How does Aetrix verify that MAX6145ESA+ is sourced from the original manufacturer or authorized distributors?
All MAX6145ESA+ 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 MAX6145ESA+ meets industry standards.
7.What is the process for return or replacement of MAX6145ESA+?
All MAX6145ESA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6145ESA+, 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 MAX6145ESA+ part is unused and in its original packaging.
Return procedure for MAX6145ESA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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