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Analog Devices Inc./Maxim Integrated MAX6138BEXR41
- Part No.:
- MAX6138BEXR41
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- -
- Datasheet:
-
MAX6138BEXR41.pdf
- Description:
- VOLTAGE REFERENCE
- Quantity:
- Payment:
- Shipping:
Inventory:1,637
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Product details
Overview
MAX6138BEXR41 from Maxim Integrated is a precision two-terminal shunt-mode bandgap voltage reference with a fixed reverse breakdown voltage of 4.096V, ±0.2% initial accuracy, and 25ppm/°C max temperature coefficient over –40°C to +85°C. It delivers stable regulation across 73µA to 15mA shunt current and features 64µVRMS wideband noise (10Hz–10kHz), enabling high-resolution ADC/DAC biasing in portable instrumentation.
For engineers reviewing the MAX6138BEXR41 datasheet, MAX6138BEXR41 pinout, MAX6138BEXR41 application, or MAX6138BEXR41 equivalent, key selection criteria include its SC70-3 package footprint, no-output-capacitor stability, low dynamic impedance (0.5–1.0Ω), and guaranteed long-term stability of 120ppm over 1000 hours.
Technical Context
The MAX6138BEXR41 implements a laser-trimmed BiCMOS bandgap core to achieve precise 4.096V output with minimal thermal drift. Its two-terminal architecture operates as a programmable current sink, maintaining regulation by dynamically adjusting shunt current in response to load and supply variations.
It requires no external stabilization capacitor and remains stable with any capacitive load, supported by low 0.5–1.0Ω dynamic impedance at 1mA and flat output impedance up to 100kHz. The device's 4.096V output aligns with 12-bit DAC/ADC full-scale references and avoids binary scaling errors in digital systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 4.096V ±0.2% at +25°C - matches 12-bit system full-scale reference without scaling circuitry |
| Initial Accuracy | ±0.2% (Grade B) - enables single-point calibration in precision sensor signal chains |
| Temp Coefficient | ≤25ppm/°C (–40°C to +85°C) - ensures ≤±0.85mV drift across industrial temperature range |
| Shunt Current Range | 73µA to 15mA - supports ultra-low-power sleep modes and high-current active regulation |
| Dynamic Impedance | 0.5Ω (typ), 1.0Ω (max) at 1mA - minimizes output voltage perturbation under fast load transients |
| Wideband Noise | 64µVRMS (10Hz–10kHz) - suitable for 16-bit SAR ADC reference without additional filtering |
| Long-Term Stability | 120ppm (1000h) - reduces recalibration frequency in sealed industrial modules |
Pinout & Package
MAX6138BEXR41 is housed in a 3-pin SC70-3 surface-mount package (1.8mm × 1.8mm × 0.9mm), 50% smaller than SOT23 alternatives. Pin 3 is No Connect (N.C.) and must be left floating or tied to Pin 2 per datasheet requirement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (+) | Positive terminal (anode) | Connects to regulated output node; sinks current when reverse-biased |
| Pin 2 (–) | Negative terminal (cathode) | Reference ground return path; forms shunt loop with Pin 1 |
| Pin 3 (N.C.) | No connection | Must remain unconnected or shorted to Pin 2 - not used for bias or feedback |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small SC70-3 package | 1.8mm × 1.8mm footprint - saves >50% board area vs. SOT23 in space-constrained wearables and IoT sensors |
| No output capacitor required | Stable with 0–1µF capacitive loads - eliminates BOM cost and layout risk of external COUT |
| Low 64µVRMS noise | 10Hz–10kHz integrated noise - supports 16-bit measurement accuracy without post-filtering |
| Wide 73µA–15mA operating range | Enables same part across battery-powered standby (µA) and active data-acquisition (mA) states |
| Laser-trimmed bandgap core | Guaranteed 0.2% initial accuracy - reduces factory calibration time and test fixture complexity |
Applications
| Portable Data Loggers | Industrial 4–20mA Transmitters |
|---|---|
|
Use Scenario: Battery-powered environmental sensor nodes recording temperature/humidity with 16-bit ADCs over multi-year deployments. IC Role / Device Role / Timing Role: Provides stable 4.096V reference for ADC conversion, eliminating ratio-metric error from supply variation. Use Value: Enables <1 LSB INL error over –40°C to +85°C without recalibration, extending field service intervals. |
Use Scenario: Loop-powered field instruments converting sensor signals to 4–20mA output using precision DACs. IC Role / Device Role / Timing Role: Supplies accurate 4.096V reference to DAC and analog front-end, ensuring current-loop compliance. Use Value: Maintains ±0.1% full-scale accuracy across supply voltage drops (12–36V) and temperature swings. |
| Medical Patient Monitors | Test & Measurement Equipment |
|
Use Scenario: Portable ECG/SpO₂ units requiring low-noise, low-power analog signal conditioning. IC Role / Device Role / Timing Role: References both ADC and programmable gain amplifier stages to preserve signal integrity. Use Value: 64µVRMS noise and 25ppm/°C TC ensure diagnostic-grade waveform fidelity during battery operation. |
Use Scenario: Benchtop multimeters and calibrators needing traceable, stable voltage references for self-test routines. IC Role / Device Role / Timing Role: Serves as internal 4.096V calibration standard for autoranging ADC subsystems. Use Value: 120ppm/1000h long-term stability reduces annual recalibration dependency in metrology-grade tools. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLVH431ACDBVR | 2.5V fixed output, ±0.5% initial accuracy, 100ppm/°C TC, SOT23-3 package | Lower precision and higher drift; suited for non-critical biasing, not 12-bit+ systems | Select only if 4.096V output and <25ppm/°C TC are not required |
| LM4040C41IDCKR | 4.096V output, ±0.5% accuracy, 100ppm/°C TC, SC70-3 package, 60µA–15mA range | Same footprint but 2.5× worse TC and accuracy; lacks low-noise optimization | Acceptable for cost-sensitive designs where 16-bit performance is not needed |
Compared with TLVH431ACDBVR and LM4040C41IDCKR, MAX6138BEXR41 provides tighter initial accuracy (±0.2% vs. ±0.5%), lower temperature drift (25ppm/°C vs. ≥100ppm/°C), and lower noise (64µVRMS vs. >100µVRMS), making it the only option qualified for 12–16-bit precision data acquisition in compact industrial and medical devices.
Availability
MAX6138BEXR41 is available at Aetrix Electronics and suitable for portable instrumentation, industrial 4–20mA transmitters, and medical monitoring equipment requiring stable component supply with guaranteed long-term availability.
Supply support for MAX6138BEXR41 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 MAX6138 family delivers high-accuracy shunt references in ultra-small SC70 packages for space-constrained, battery-operated systems demanding low drift and low noise.
FAQ
What is the maximum shunt current rating for MAX6138BEXR41?
The MAX6138BEXR41 supports a continuous shunt current range of 73µA to 15mA. Absolute maximum reverse current is 20mA - exceeding this risks permanent damage. Operation within the 73µA–15mA range ensures specified accuracy, dynamic impedance, and noise performance across the full –40°C to +85°C temperature range.
Does MAX6138BEXR41 require an external output capacitor?
No, MAX6138BEXR41 does not require an external output capacitor for stability. It is designed to remain stable with any capacitive load from 0 to 1µF, eliminating the need for external components and simplifying layout. This feature is verified across all operating conditions including full temperature and current ranges.
What is the temperature coefficient specification for MAX6138BEXR41?
MAX6138BEXR41 has a guaranteed maximum temperature coefficient of 25ppm/°C over the –40°C to +85°C operating range. Typical performance is ±4ppm/°C, and the polarity (positive or negative) varies per unit but remains within the 25ppm/°C bound. This ensures predictable, bounded drift in precision measurement systems.
Can Pin 3 of MAX6138BEXR41 be left unconnected?
Yes - Pin 3 of MAX6138BEXR41 is designated N.C. (No Connection) and must either be left floating or connected directly to Pin 2 (–). It serves no electrical function and connecting it elsewhere may compromise regulation or reliability. This requirement is explicitly stated in the official datasheet pin description.
How does MAX6138BEXR41 compare to LM4040 for 4.096V reference applications?
MAX6138BEXR41 offers superior performance versus LM4040C41IDCKR: ±0.2% vs. ±0.5% initial accuracy, 25ppm/°C vs. 100ppm/°C temperature coefficient, and 64µVRMS vs. >100µVRMS noise. Both use SC70-3 packages, but MAX6138BEXR41 achieves higher precision in the same footprint - critical for 12-bit+ systems where LM4040 falls short.
MAX6138BEXR41 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- -
- Series:
- *
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Reference Type:
- -
- Output Type:
- -
- Voltage - Output (Min/Fixed):
- -
- Voltage - Output (Max):
- -
- Current - Output:
- -
- Tolerance:
- -
- Temperature Coefficient:
- -
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
MAX6138BEXR41 FAQ
1.How can I place an order for MAX6138BEXR41 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6138BEXR41 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 MAX6138BEXR41 reliable?
The price and inventory of MAX6138BEXR41 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6138BEXR41 is usually 5 days.
3.What payment methods are accepted for MAX6138BEXR41?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6138BEXR41 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6138BEXR41?
MAX6138BEXR41 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6138BEXR41 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 MAX6138BEXR41?
For technical support, including MAX6138BEXR41 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6138BEXR41 requirements.
6.How does Aetrix verify that MAX6138BEXR41 is sourced from the original manufacturer or authorized distributors?
All MAX6138BEXR41 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 MAX6138BEXR41 meets industry standards.
7.What is the process for return or replacement of MAX6138BEXR41?
All MAX6138BEXR41 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6138BEXR41, 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 MAX6138BEXR41 part is unused and in its original packaging.
Return procedure for MAX6138BEXR41:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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