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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:1,138
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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, and 200mV dropout voltage - enabling stable operation in 5V systems with tight supply margins and battery-powered instrumentation.
For engineers reviewing the MAX6145ESA datasheet, MAX6145ESA pinout, MAX6145ESA application, or MAX6145ESA equivalent, this device supports high-accuracy ADC/DAC biasing, portable data acquisition calibration, and low-power sensor signal conditioning where input-to-output headroom and thermal stability are critical selection criteria.
Technical Context
The MAX6145ESA uses a bandgap-based reference core with internal trimming for 4.5V output, optimized for operation from 4.7V to 12.6V input while maintaining load regulation of ≤1.8 mV/mA (sourcing) and ≤18 mV/mA (sinking). Its supply current remains stable at 79–105 µA across temperature and input voltage variations.
It achieves 30 µVP-P (0.1Hz–10Hz) and 800 µVP-P (10Hz–10kHz) output noise, with line regulation of 2 µV/V and thermal hysteresis of 80 ppm - confirming suitability for precision analog front-ends requiring repeatable DC bias under thermal cycling.
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 consistent DAC/ADC reference level across industrial temperature range. |
| Initial Accuracy | ±1% - eliminates need for system-level trimming in cost-sensitive portable instrumentation. |
| Tempco | 15 ppm/°C typical, ≤50 ppm/°C max - limits drift to <±0.023 V over full temperature range, critical for multi-decade measurement stability. |
| Dropout Voltage | 200 mV at 1 mA load - enables use with 5V rails as low as 4.7V, supporting brownout-resilient designs. |
| Supply Current | 79–105 µA at +25°C, ≤130 µA over temperature - minimizes quiescent power in battery-operated devices. |
| Load Regulation | ≤1.8 mV/mA sourcing, ≤18 mV/mA sinking - maintains reference integrity during dynamic load transients in mixed-signal SoCs. |
| Noise (0.1–10 Hz) | 30 µVP-P - reduces low-frequency error contribution in high-resolution 16-bit+ data acquisition systems. |
Pinout & Package
MAX6145ESA is housed in an 8-pin SO (Small Outline) package with standard JEDEC MS-012AC footprint (5.0 mm × 6.2 mm, 1.75 mm height), RoHS-compliant, and rated for -40°C to +85°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | IN | Input voltage terminal; accepts 4.7V to 12.6V supply - must exceed output by ≥200 mV for regulation. |
| 2 | N.C. | No internal connection - electrically isolated; no routing or grounding required. |
| 3 | N.C. | No internal connection - electrically isolated; no routing or grounding required. |
| 4 | N.C. (ADJ) | No connection on MAX6145ESA; ADJ function only present on MAX6160 - pin left unconnected. |
| 5 | OUT | Precision 4.5V reference output - drives loads up to 1 mA with minimal droop and noise. |
| 6 | N.C. | No internal connection - electrically isolated; no routing or grounding required. |
| 7 | N.C. | No internal connection - electrically isolated; no routing or grounding required. |
| 8 | GND | Analog ground reference - requires low-impedance connection to system ground plane for noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Low dropout (200 mV) | Enables reliable regulation from 5V supplies down to 4.7V, extending usable battery life in 3.3V/5V hybrid systems. |
| Stable with 0–10 nF capacitive loads | Eliminates need for external output capacitor - simplifies layout and avoids phase-margin risks in compact PCBs. |
| Supply current independence from VIN | Quiescent current varies only ±6 µA/V over 4.7–12.6V input - prevents reference shift during supply ripple or sag. |
| Guaranteed 50 ppm/°C tempco | Ensures worst-case drift ≤±0.023 V over -40°C to +85°C - meets Class A instrumentation requirements without calibration. |
| Thermal hysteresis ≤80 ppm | Confirms repeatability after thermal cycling - essential for field-deployed test equipment requiring long-term measurement fidelity. |
Applications
| Portable Data Acquisition | Battery-Powered Instrumentation |
|---|---|
Use Scenario: Handheld multimeter sampling analog inputs at 10 kSPS with 16-bit SAR ADC. IC Role / Device Role / Timing Role: Primary voltage reference for ADC conversion and internal DAC calibration. Use Value: 4.5V output with 30 µVP-P low-frequency noise and 1.8 mV/mA load regulation ensures <±0.5 LSB error across operating temperature and battery discharge. |
Use Scenario: Wireless gas sensor node powered by two AA cells (2.4–3.2V) with boost converter feeding 5V rail. IC Role / Device Role / Timing Role: Stable reference for analog front-end amplifiers and 12-bit ADC. Use Value: 200 mV dropout allows regulation even when boosted 5V rail sags to 4.7V during peak transmit current, preventing reference collapse. |
| Industrial Process Monitoring | Calibration Equipment |
Use Scenario: DIN-rail mounted temperature transmitter with 4–20 mA loop and HART interface. IC Role / Device Role / Timing Role: Precision reference for current-loop DAC and sensor excitation circuitry. Use Value: ±1% initial accuracy and ≤50 ppm/°C tempco ensure <±0.1% full-scale error over -40°C to +85°C ambient - compliant with IEC 61000-6-2 EMC and SIL-2 functional safety margins. |
Use Scenario: Benchtop calibrator generating precise 4.5V test signals for DMM verification. IC Role / Device Role / Timing Role: Primary reference source for programmable voltage output stage. Use Value: Thermal hysteresis ≤80 ppm and 0.023 V total drift guarantee repeatable 4.5V output after repeated thermal cycling - meeting ANSI/NCSL Z540 calibration traceability requirements. |
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, 3.6–18V input, SO-8 package - lower drift but higher 950 µA quiescent current. | Used in lab-grade equipment where ultra-low drift outweighs battery life concerns; not suitable for sub-100 µA systems. | Select REF5045IDR when tempco <10 ppm/°C is mandatory and supply current >900 µA is acceptable. |
| ADR4545BRZ | 4.5V output, 3ppm/°C max tempco, 5.5–18V input, SO-8 package - laser-trimmed, higher initial accuracy (±0.02%), but requires ≥5.5V input. | Deployed in high-end medical imaging front-ends needing <0.05% absolute accuracy; incompatible with 5V-only systems. | Choose ADR4545BRZ only if input voltage ≥5.5V is guaranteed and sub-0.03% initial error is required. |
Compared with REF5045IDR and ADR4545BRZ, MAX6145ESA delivers optimal balance of 200 mV dropout, 79 µA supply current, and ±1% accuracy for 5V-referenced industrial and portable systems - making it the preferred choice where headroom, power, and cost constraints dominate over ultra-low-drift requirements.
Availability
MAX6145ESA is available at Aetrix Electronics and suitable for portable instrumentation, industrial process monitoring, and battery-powered data acquisition requiring stable component supply, long-lifecycle availability, and RoHS-compliant packaging.
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 high-performance analog and mixed-signal ICs for industrial, automotive, and communications applications, with emphasis on power efficiency and signal integrity.
The MAX61xx family targets precision voltage references for space-constrained, low-power systems - delivering micropower operation, low dropout, and robust thermal performance in standard packages.
FAQ
What is the minimum input voltage required for stable regulation of the MAX6145ESA?
The MAX6145ESA requires a minimum input voltage of 4.7V to maintain regulation at its nominal 4.5V output, due to its 200mV dropout specification. Operation below 4.7V results in loss of regulation and output voltage collapse proportional to input drop. This threshold is guaranteed across the full -40°C to +85°C temperature range and applies regardless of load current up to 1mA.
Does the MAX6145ESA require an output capacitor for stability?
No, the MAX6145ESA does not require an output capacitor and is explicitly characterized as stable with capacitive loads from 0nF to 10nF. Adding capacitance beyond 10nF may degrade transient response and increase settling time. For applications needing charge reservoir capability (e.g., driving DAC reference inputs), total output capacitance must remain ≤10nF to preserve specified performance.
Can the MAX6145ESA be used in place of the MAX6141ESA or MAX6150ESA?
No - the MAX6145ESA is not a direct replacement for MAX6141ESA (4.096V) or MAX6150ESA (5.0V), as each part has a fixed, factory-trimmed output voltage. Swapping them alters the reference level by hundreds of millivolts, causing gain/offset errors in ADCs, DACs, and comparators. System redesign and recalibration would be required to substitute between these variants.
What is the maximum load current the MAX6145ESA can drive while maintaining specification?
The MAX6145ESA is specified to deliver up to 1mA of sourcing current while maintaining its guaranteed load regulation (≤1.8 mV/mA) and output voltage accuracy. Sinking capability is also rated to 1mA, with load regulation ≤18 mV/mA. Exceeding 1mA may cause output droop beyond datasheet limits and increased thermal drift, especially at elevated ambient temperatures.
Is the MAX6145ESA pin-compatible with other members of the MAX61xx family in SO-8 package?
Yes - all SO-8 variants in the MAX61xx family (MAX6125ESA, MAX6141ESA, MAX6145ESA, MAX6150ESA, MAX6160ESA) share identical pinouts: Pin 1 = IN, Pins 2–3–6–7 = N.C., Pin 4 = N.C. (ADJ, unused on non-MAX6160 parts), Pin 5 = OUT, Pin 8 = GND. This allows drop-in replacement within the same voltage grade, provided board layout accommodates the specific output requirement.
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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