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Analog Devices Inc./Maxim Integrated MAX6138BEXR30
- Part No.:
- MAX6138BEXR30
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- SC-70, SOT-323
- Datasheet:
-
MAX6138BEXR30.pdf
- Description:
- VOLTAGE REFERENCE
- Quantity:
- Payment:
- Shipping:
Inventory:1,694
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Product details
Overview
MAX6138BEXR30 from Maxim Integrated is a precision two-terminal shunt-mode bandgap voltage reference with a fixed 3.000V reverse breakdown voltage, 0.2% initial accuracy, 25ppm/°C max temperature coefficient, and operation over –40°C to +85°C - used in high-accuracy ADC/DAC biasing, portable power monitoring, and battery-fueled instrumentation.
For engineers reviewing the MAX6138BEXR30 datasheet, MAX6138BEXR30 pinout, MAX6138BEXR30 application, or MAX6138BEXR30 equivalent, key selection factors include its SC70-3 package footprint, 60µA–15mA shunt-current range, 45µVRMS wideband noise (10Hz–10kHz), and capacitor-free stability with capacitive loads.
Technical Context
The MAX6138BEXR30 implements a laser-trimmed BiCMOS bandgap core delivering stable 3.000V output across ±25ppm/°C drift and 0.2% initial tolerance. Its two-terminal architecture requires no external capacitor and maintains regulation under load transients up to 10mA with <8.0mV output change.
It operates as a precision current-sink reference: reverse current (ISHUNT) flows between Pin 1 (+) and Pin 2 (–), while Pin 3 is NC (must float or tie to Pin 2). Dynamic impedance remains ≤0.8Ω at 1mA, enabling low-noise performance in space-constrained analog signal chains.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.000V ±0.2% at +25°C - ensures accurate 12-bit+ ADC reference without calibration. |
| Temp Coefficient | ≤25ppm/°C over –40°C to +85°C - limits voltage drift to ±0.63mV across full industrial range. |
| Shunt Current Range | 60µA to 15mA - supports ultra-low-power sensor nodes and high-current precision regulators. |
| Wideband Noise | 45µVRMS (10Hz–10kHz) - preserves SNR in 16-bit data acquisition systems. |
| Dynamic Impedance | ≤0.8Ω at 1mA - minimizes load-induced error during fast current transients. |
| Long-Term Stability | 120ppm after 1000h - enables reliable operation in unattended field instrumentation. |
| Package | SC70-3 (1.8mm × 1.8mm) - saves >50% board area vs. SOT23 equivalents. |
Pinout & Package
MAX6138BEXR30 uses the 3-pin SC70 surface-mount package (1.8mm × 1.8mm, 0.95mm height), optimized for high-density PCB layouts in portable and battery-powered systems.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (+) | Anode / Positive Terminal | Connects to regulated supply rail; sinks shunt current when reverse-biased. |
| 2 (–) | Cathode / Negative Terminal | Reference ground node; forms voltage drop with Pin 1 to define 3.000V output. |
| 3 (N.C.) | No Connection | Must remain floating or be tied to Pin 2 - no internal connection; avoids parasitic leakage paths. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small SC70-3 package | 1.8mm × 1.8mm footprint - enables placement in tight spaces like wearable sensor modules. |
| No output capacitor required | Stable with 0–1µF capacitive loads - eliminates BOM cost and layout risk of external stabilization. |
| Laser-trimmed accuracy | 0.2% initial tolerance (MAX6138B grade) - reduces system-level calibration overhead in production test. |
| Low dynamic impedance | ≤0.8Ω at 1mA - maintains voltage stability during rapid load current steps in switched-mode power monitors. |
| Wide operating current range | 60µA–15mA - accommodates both nanoamp sleep modes and 10mA active-sensing phases. |
Applications
| Portable Medical Sensors | Battery Fuel Gauging |
|---|---|
Use Scenario: Continuous glucose monitor (CGM) with 16-bit ADC sampling analog electrochemical signals. IC Role / Device Role / Timing Role: Shunt voltage reference providing stable 3.000V reference for ADC conversion and sensor biasing. Use Value: 0.2% initial accuracy and 45µVRMS noise ensure <±0.5 LSB error across full temperature range, critical for clinical-grade measurement fidelity. |
Use Scenario: Smart battery pack with coulomb counter IC requiring precise voltage scaling for cell voltage monitoring. IC Role / Device Role / Timing Role: Reference source for fuel gauge analog front-end, rejecting supply ripple and thermal drift. Use Value: 25ppm/°C tempco and 120ppm long-term stability maintain SOC estimation accuracy over 2+ years of field use. |
| Industrial Data Loggers | IoT Edge Node Power Monitoring |
Use Scenario: Ruggedized environmental logger capturing temperature, pressure, and humidity with isolated 24-bit sigma-delta ADC. IC Role / Device Role / Timing Role: Precision shunt reference for ADC reference input and sensor excitation circuitry. Use Value: SC70-3 size allows integration into compact DIN-rail enclosures; 60µA min current enables operation from energy-harvesting sources. |
Use Scenario: Cellular-connected smart meter measuring AC mains voltage via resistive divider and 12-bit SAR ADC. IC Role / Device Role / Timing Role: Stable 3.000V reference for ADC and microcontroller VREF input in battery-backed operation. Use Value: Capacitor-free stability simplifies design for conformal-coated PCBs; 15mA max shunt current supports fast wake-up response. |
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, 0.5% initial accuracy, 100ppm/°C tempco, SOT-23-3 package | Lower precision and higher drift; suitable only for non-critical biasing where 3.0V is not mandatory | Select when cost sensitivity outweighs accuracy requirements and 2.5V output suffices |
| ADR3430ARJZ-R7 | 3.0V, 0.1% initial accuracy, 10ppm/°C tempco, SOT-23-3 package, 5.5mA max shunt current | Higher precision and lower drift but limited current drive; requires external capacitor for full-load stability | Choose for metrology-grade systems needing tighter specs, accepting larger footprint and added capacitor |
Compared with TLVH431ACDBVR and ADR3430ARJZ-R7, MAX6138BEXR30 delivers optimal balance of 0.2% accuracy, 25ppm/°C drift, 15mA current capability, and capacitor-free operation in the smallest SC70-3 footprint - making it ideal for space-constrained, battery-operated precision analog systems.
Availability
MAX6138BEXR30 is available at Aetrix Electronics and suitable for portable medical sensors, battery fuel gauging, and industrial data loggers requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for MAX6138BEXR30 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 miniaturization and reliability.
The MAX6138 family delivers ultra-compact, high-accuracy shunt references for space- and power-constrained systems - targeting portable instrumentation, battery management, and industrial sensing where SC70 size and capacitor-free stability are decisive.
FAQ
What is the exact output voltage tolerance of MAX6138BEXR30 at room temperature?
The MAX6138BEXR30 has a nominal output voltage of 3.000V with a maximum initial tolerance of ±0.2% at +25°C, meaning the measured reverse breakdown voltage falls between 2.9940V and 3.0060V under standard test conditions. This 0.2% grade (B) is laser-trimmed at wafer level and guaranteed across the full –40°C to +85°C operating range.
Can MAX6138BEXR30 operate without an external output capacitor?
Yes, MAX6138BEXR30 is designed for capacitor-free operation and remains stable with any output capacitance from 0 to 1µF. Unlike many shunt references, it does not require an external capacitor for phase margin or transient stability - simplifying layout and reducing BOM count in compact designs.
What is the minimum shunt current required for regulation in MAX6138BEXR30?
The MAX6138BEXR30 requires a minimum shunt current (IRMIN) of 65µA to maintain regulation across its full temperature range (–40°C to +85°C). Below this threshold, output voltage may deviate beyond specified limits. The device supports up to 15mA shunt current, with absolute maximum rating at 20mA.
How does the noise performance of MAX6138BEXR30 compare to other 3V shunt references?
MAX6138BEXR30 delivers 45µVRMS wideband noise (10Hz–10kHz), measured at 100µA shunt current. This is lower than typical 3V shunt references such as TLVH431 (≈100µVRMS) and competitive with higher-cost alternatives like ADR3430 (≈35µVRMS), making it suitable for 16-bit data acquisition where noise directly impacts effective resolution.
Is Pin 3 of MAX6138BEXR30 functional or optional?
Pin 3 of MAX6138BEXR30 is designated N.C. (No Connection) and has no internal bond. It must either be left floating or connected to Pin 2 (cathode/negative terminal); neither configuration affects electrical performance, but tying it to Pin 2 prevents potential contamination-related leakage paths in harsh environments.
MAX6138BEXR30 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- SC-70, SOT-323
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Reference Type:
- Shunt
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 3V
- Voltage - Output (Max):
- -
- Current - Output:
- 15 mA
- Tolerance:
- ±0.2%
- Temperature Coefficient:
- 25ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 45µVrms
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 65 µA
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-3
MAX6138BEXR30 FAQ
1.How can I place an order for MAX6138BEXR30 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6138BEXR30 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 MAX6138BEXR30 reliable?
The price and inventory of MAX6138BEXR30 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6138BEXR30 is usually 5 days.
3.What payment methods are accepted for MAX6138BEXR30?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6138BEXR30 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6138BEXR30?
MAX6138BEXR30 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6138BEXR30 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 MAX6138BEXR30?
For technical support, including MAX6138BEXR30 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6138BEXR30 requirements.
6.How does Aetrix verify that MAX6138BEXR30 is sourced from the original manufacturer or authorized distributors?
All MAX6138BEXR30 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 MAX6138BEXR30 meets industry standards.
7.What is the process for return or replacement of MAX6138BEXR30?
All MAX6138BEXR30 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6138BEXR30, 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 MAX6138BEXR30 part is unused and in its original packaging.
Return procedure for MAX6138BEXR30:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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