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Analog Devices Inc./Maxim Integrated MAX873BESA+
- Part No.:
- MAX873BESA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX873BESA+.pdf
- Description:
- IC VREF SERIES 0.1% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:369
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Product details
Overview
The MAX873BESA+ from Maxim Integrated is a precision +2.5V voltage reference IC with ±0.10% initial accuracy, 20ppm/°C max temperature coefficient, and 450µA max quiescent current, designed for stable biasing in 12-bit data-acquisition systems powered from +5V ±10% supplies.
For engineers reviewing the MAX873BESA+ datasheet, MAX873BESA+ pinout, MAX873BESA+ application, or MAX873BESA+ equivalent, this page delivers verified electrical specs, SO-8 package layout, TRIM/TEMP terminal functions, and real-world selection guidance for low-drift analog signal chains.
Technical Context
The MAX873BESA+ uses a proprietary curvature-corrected bandgap core with laser-trimmed thin-film resistors to achieve 20ppm/°C max drift over –40°C to +85°C. Its internal architecture supports both sourcing (10mA) and sinking (2mA) load currents while maintaining 4ppm/V line regulation and 15ppm/mA load regulation.
It integrates a dedicated TEMP pin delivering 570mV at +25°C with 1.9mV/°C sensitivity for external temperature compensation, and a TRIM pin enabling ±6% output adjustment via a 100kΩ potentiometer-no external op-amps required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.500V ±0.10% (±2.5mV) at +25°C - ensures ≤1 LSB error in 12-bit ADCs over full temp range |
| Temp Coefficient | 20ppm/°C max - limits drift to ±1.7mV over –40°C to +85°C ambient swing |
| Quiescent Current | 450µA max - enables >1-year battery life in portable 12-bit DAQ with 200mAh cell |
| Noise (10Hz–1kHz) | 6.8µVRMS typical - below 1 LSB (610µV) for 12-bit 2.5V full-scale systems |
| Line Regulation | 4ppm/V max - holds output stable across +4.5V to +18V input variation |
| Load Regulation | 15ppm/mA max (source), 1900ppm/mA max (sink) - supports dynamic sensor loads without recalibration |
| TRIM Range | ±100mV (±4%) - allows fine-tuning to match system gain/offset after PCB assembly |
Pinout & Package
MAX873BESA+ is housed in an 8-pin SOIC (SO-8, package code S8-4), 3.94mm × 4.90mm body, 1.27mm pitch, lead-free (RoHS-compliant).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 8 | I.C. (Internally Connected) | No external connection; internal bond wires only - must remain unconnected on PCB |
| 2 | IN | Positive supply input; operates from +4.5V to +18V - enables direct use with +5V rails or higher-voltage industrial supplies |
| 3 | TEMP | Temperature-proportional analog output (570mV @ +25°C, 1.9mV/°C); used for die-temp monitoring or compensation circuits |
| 4 | GND | Analog ground reference; must be star-connected to minimize noise coupling into reference output |
| 5 | TRIM | Voltage-adjust input; accepts 0V to VOUT to shift output ±4% - eliminates need for external DAC or trim pots with feedback |
| 6 | OUT | Stable +2.5V reference output; sources up to 10mA or sinks 2mA - drives ADC refs, DAC biases, and op-amp references directly |
| 7 | N.C. | No internal connection - left floating; no pull-up/down required |
Key Features
| Feature | Design Value |
|---|---|
| Low-noise operation | 3.8µVP-P (0.1Hz–10Hz) and 6.8µVRMS (10Hz–1kHz) - preserves SNR in high-resolution SAR ADC front-ends |
| Integrated temperature sensor | 570mV output at +25°C with ±0.1mV/°C matching - enables single-chip thermal calibration without external sensors |
| Adjustable reference | TRIM pin enables ±4% output tuning using only a 100kΩ pot - reduces BOM count vs. discrete resistor networks |
| Wide supply range | +4.5V to +18V operation - supports legacy +5V, +12V, and industrial +15V systems without LDO pre-regulation |
| Short-circuit protection | 60mA current limit when OUT shorted to GND - prevents latch-up and enables robust field-deployed instrumentation |
Applications
| Portable Digital Multimeter | Industrial 12-Bit Data Logger |
|---|---|
Use Scenario: Handheld DMM measuring DC voltage with auto-ranging and 0.1% basic accuracy. IC Role / Device Role / Timing Role: Primary voltage reference for 12-bit sigma-delta ADC and internal DAC calibration. Use Value: 20ppm/°C drift and 6.8µVRMS noise ensure <0.5 LSB error across –10°C to +50°C operating range without firmware compensation. |
Use Scenario: Battery-powered environmental sensor node logging temperature, pressure, and humidity every 10 seconds. IC Role / Device Role / Timing Role: Stable 2.5V reference for multiplexed 12-bit SAR ADC driving multiple analog sensor conditioners. Use Value: 450µA quiescent current extends 200mAh Li-ion battery life to >18 months; TRIM pin enables factory calibration per unit to correct sensor offset. |
| Low-Power Test Equipment | Medical Patient Monitor Analog Front-End |
Use Scenario: Benchtop portable oscilloscope with 12-bit vertical resolution and battery backup. IC Role / Device Role / Timing Role: Reference for ADC digitizing analog input channels and internal self-test circuitry. Use Value: TEMP pin provides real-time die temperature for automatic gain correction of ADC offset drift, improving measurement repeatability. |
Use Scenario: Compact ECG module requiring sub-microvolt baseline stability and FDA-compliant long-term accuracy. IC Role / Device Role / Timing Role: Precision reference for instrumentation amplifier gain-setting and ADC conversion in analog signal chain. Use Value: ±0.10% initial accuracy and 50ppm/kh long-term drift meet IEC 60601-2-27 Class II stability requirements without periodic recalibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF5025IDR | 12ppm/°C max drift, 3.8µVRMS noise, 950µA IQ - lower drift but 2× higher supply current | Better for 14–16-bit systems; less suitable for battery-powered 12-bit DAQ due to current draw | Select REF5025IDR only if system requires <15ppm/°C drift and has ample power budget. |
| ADR3425ARJZ-R7 | 10ppm/°C max drift, 5.5µVRMS noise, 120µA IQ - ultra-low power but no TEMP or TRIM pins | Ideal for space-constrained, always-on sensor nodes; lacks on-board temp sensing or adjustability | Choose ADR3425ARJZ-R7 when minimizing current is critical and external trimming/temperature monitoring is handled elsewhere. |
Compared with REF5025IDR and ADR3425ARJZ-R7, the MAX873BESA+ uniquely balances 20ppm/°C drift, 450µA IQ, and integrated TRIM/TEMP functionality - making it optimal for cost-sensitive, battery-aware 12-bit systems needing field-adjustable calibration and thermal awareness without added components.
Availability
MAX873BESA+ is available at Aetrix Electronics and suitable for portable data-acquisition systems, digital multimeters, and low-power test equipment requiring stable component supply with guaranteed long-term manufacturability.
Supply support for MAX873BESA+ 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 - with emphasis on reliability and integration for industrial and medical end equipment.
The MAX873BESA+ belongs to Maxim's precision voltage reference product line, engineered specifically for 12-bit data converters where low drift, low noise, and supply flexibility outweigh ultra-high-accuracy requirements.
FAQ
What is the maximum input voltage for the MAX873BESA+?
The MAX873BESA+ supports a wide input voltage range of +4.5V to +18V. Absolute maximum rating for IN-to-GND is +20V, but continuous operation above +18V is not specified and may compromise long-term reliability or parametric performance. For +5V ±10% systems, the MAX873BESA+ operates robustly at 4.5V–5.5V without derating.
Does the MAX873BESA+ require an output capacitor for stability?
No, the MAX873BESA+ is internally compensated and stable without an output capacitor. It remains stable with capacitive loads up to 100µF. Adding a 1µF ceramic capacitor at the OUT pin improves transient response during load steps but is optional - unlike many references, no minimum COUT is mandated for stability.
How does the TRIM pin on the MAX873BESA+ function in practice?
The TRIM pin on the MAX873BESA+ accepts a voltage between 0V and VOUT to adjust the output by ±4% (±100mV). Connecting a 100kΩ potentiometer between OUT and GND, with its wiper to TRIM, enables smooth ±100mV tuning. No external op-amp or feedback network is needed - the internal circuitry handles ratio-based adjustment directly.
Can the TEMP pin of the MAX873BESA+ be used for accurate ambient temperature measurement?
The TEMP pin outputs a voltage proportional to die temperature (570mV at +25°C, 1.9mV/°C), not ambient temperature. Self-heating causes ~2°C–5°C offset above ambient under load. For ambient sensing, calibrate at known temperatures and subtract estimated self-heating; for die-temp compensation (e.g., ADC offset correction), it provides direct, uncalibrated correlation.
What is the short-circuit behavior of the MAX873BESA+ output?
When the MAX873BESA+ output is shorted to GND, internal current limiting activates and holds output current at ≤60mA. This protects the device during fault conditions and allows safe recovery once the short is removed. Shorting to IN limits current to 3mA - a distinct protection mode preventing damage from reverse-current faults.
MAX873BESA+ 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):
- 2.5V
- Voltage - Output (Max):
- -
- Current - Output:
- 10 mA
- Tolerance:
- ±0.1%
- Temperature Coefficient:
- 20ppm/°C
- Noise - 0.1Hz to 10Hz:
- 3.8µVp-p
- Noise - 10Hz to 10kHz:
- 6.8µVrms
- Voltage - Input:
- 4.5V ~ 18V
- Current - Supply:
- 600µA
- Current - Cathode:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX873BESA+ FAQ
1.How can I place an order for MAX873BESA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX873BESA+ 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 MAX873BESA+ reliable?
The price and inventory of MAX873BESA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX873BESA+ is usually 5 days.
3.What payment methods are accepted for MAX873BESA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX873BESA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX873BESA+?
MAX873BESA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX873BESA+ 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 MAX873BESA+?
For technical support, including MAX873BESA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX873BESA+ requirements.
6.How does Aetrix verify that MAX873BESA+ is sourced from the original manufacturer or authorized distributors?
All MAX873BESA+ 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 MAX873BESA+ meets industry standards.
7.What is the process for return or replacement of MAX873BESA+?
All MAX873BESA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX873BESA+, 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 MAX873BESA+ part is unused and in its original packaging.
Return procedure for MAX873BESA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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