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Analog Devices Inc./Maxim Integrated MAX6138CEXR50-T
- Part No.:
- MAX6138CEXR50-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- SC-70, SOT-323
- Datasheet:
-
MAX6138CEXR50-T.pdf
- Description:
- VOLTAGE REFERENCE
- Quantity:
- Payment:
- Shipping:
Inventory:2,200
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Product details
Overview
MAX6138CEXR50-T from Maxim Integrated is a precision two-terminal shunt-mode bandgap voltage reference with a fixed 5.000V reverse breakdown voltage, ±0.5% initial accuracy, and 25ppm/°C max temperature coefficient over –40°C to +85°C. It delivers stable regulation across 80µA to 15mA shunt current, features 80µVRMS wideband noise (10Hz–10kHz), and operates without external output capacitance in space-constrained portable instrumentation.
For engineers reviewing the MAX6138CEXR50-T datasheet, MAX6138CEXR50-T pinout, MAX6138CEXR50-T application, or MAX6138CEXR50-T equivalent, key selection criteria include its SC70-3 package footprint, no-capacitor stability, low dynamic impedance (≤1.1Ω), and compatibility with high-impedance sensing circuits requiring tight long-term drift control (120ppm/1000h).
Technical Context
The MAX6138CEXR50-T implements a laser-trimmed BiCMOS bandgap core to achieve precise 5.000V reference voltage generation via two-terminal shunt operation. Its internal architecture maintains regulation by dynamically sinking current through an integrated pass transistor, eliminating need for series pass elements or external compensation.
It guarantees performance across –40°C to +85°C ambient, supports capacitive loads of any value without oscillation, and exhibits monotonic reverse-current vs. voltage behavior with minimal dynamic impedance variation (0.5–1.1Ω) from 1mA to 15mA shunt current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 5.000V nominal, with ±0.5% initial tolerance (4.975V to 5.025V at +25°C) - ensures accurate ADC/DAC biasing in 5V systems. |
| Temp Coefficient | Max 25ppm/°C over –40°C to +85°C - limits voltage drift to ±2.1mV across full industrial temperature range. |
| Shunt Current Range | 80µA min to 15mA max - enables use with high-source-impedance supplies and low-power sensor interfaces. |
| Dynamic Impedance | 0.5Ω to 1.1Ω at 1mA/120Hz - provides low AC impedance for ripple rejection in noisy power environments. |
| Wideband Noise | 80µVRMS (10Hz–10kHz) - minimizes added noise in precision measurement front-ends and high-resolution data acquisition. |
| Long-Term Stability | 120ppm change over 1000 hours - supports reliable calibration retention in battery-powered field instruments. |
| Package | SC70-3 (1.8mm × 1.8mm) - reduces PCB area by 50% vs. SOT23, critical for ultra-compact wearables and IoT nodes. |
Pinout & Package
MAX6138CEXR50-T uses the 3-pin SC70 surface-mount package (1.8mm × 1.8mm). 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) | Reference output node; connects to load high-side or feedback network input. |
| Pin 2 (–) | Negative terminal (cathode) | Current sink node; ties to system ground or return path for shunt current. |
| Pin 3 (N.C.) | No connection | Must remain unconnected or shorted to Pin 2; not electrically active and not bonded internally. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small SC70-3 package | 1.8mm × 1.8mm footprint - saves >50% board space vs. SOT23 alternatives, enabling miniaturized medical sensors. |
| No output capacitor required | Stable with any capacitive load (0–∞) - eliminates BOM cost, layout risk, and ESR sensitivity in compact designs. |
| Low wideband noise | 80µVRMS (10Hz–10kHz) - preserves SNR in 16-bit+ data converters without additional filtering. |
| Laser-trimmed accuracy | ±0.5% initial tolerance - reduces calibration overhead in factory programming of portable test equipment. |
| High shunt-current capability | Up to 15mA sink current - supports direct interface with op-amp buffers and high-current reference distribution networks. |
Applications
| Portable Medical Sensors | Industrial Data Loggers |
|---|---|
Use Scenario: Battery-powered handheld blood glucose meters requiring stable 5V reference for analog front-end signal conditioning. IC Role / Device Role / Timing Role: Two-terminal shunt reference providing regulated 5.000V bias to 16-bit SAR ADC and transducer amplifier stages. Use Value: 0.5% initial accuracy and 25ppm/°C TC ensure <±3mV total error across operating temperature, meeting ISO 15197 clinical accuracy requirements. |
Use Scenario: Ruggedized environmental monitoring units deployed in remote locations with wide ambient temperature swings. IC Role / Device Role / Timing Role: Primary voltage reference for multi-channel 24-bit sigma-delta ADCs measuring thermocouple, RTD, and strain gauge outputs. Use Value: 120ppm/1000h long-term stability and no-output-capacitor operation enable 5-year uncalibrated field accuracy without maintenance. |
| Smart Energy Meters | Wearable Health Monitors |
Use Scenario: DIN-rail mounted electricity meters needing metrology-grade reference under varying line-voltage conditions. IC Role / Device Role / Timing Role: Shunt reference supplying precision bias to isolated current-sense amplifiers and energy measurement ICs. Use Value: Wide 80µA–15mA shunt current range allows stable operation across 100:1 load current variations, supporting both standby and peak measurement modes. |
Use Scenario: Ultra-thin fitness trackers with constrained PCB real estate and strict power budget constraints. IC Role / Device Role / Timing Role: Compact 5V reference for optical heart-rate sensor analog chain and low-power microcontroller ADC. Use Value: SC70-3 package reduces footprint by 50% vs. SOT23, while 80µA minimum operating current extends battery life in always-on sensing mode. |
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 | 3-pin adjustable shunt reference (2.5V–36V); 0.5% initial accuracy; 100ppm/°C TC; requires external resistors for 5V setting. | Higher TC and resistor-dependent accuracy reduce stability in temperature-variable environments. | Choose when design flexibility for multiple output voltages justifies added components and reduced thermal performance. |
| LM4040C50IDBZR | 3-pin shunt reference; 5.0V nominal; 0.5% initial accuracy; 100ppm/°C TC; SOT23-3 package (2.9mm × 1.6mm). | 50% larger footprint and higher TC limit suitability for high-density, wide-temperature industrial applications. | Choose only if legacy SOT23 layout reuse is mandatory and SC70 rework is prohibited. |
Compared with TLVH431ACDBVR and LM4040C50IDBZR, MAX6138CEXR50-T offers superior thermal stability (25ppm/°C vs. 100ppm/°C), smaller SC70-3 footprint, and guaranteed no-capacitor stability - making it optimal for next-generation portable instrumentation where size, drift, and layout simplicity are critical.
Availability
MAX6138CEXR50-T is available at Aetrix Electronics and suitable for portable medical sensors, industrial data loggers, smart energy meters, and wearable health monitors requiring stable component supply with guaranteed long-term availability.
Supply support for MAX6138CEXR50-T 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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and consumer applications.
The MAX6138 product line delivers precision shunt voltage references optimized for space-constrained, battery-powered systems demanding low drift, low noise, and capacitor-free stability - targeting portable instrumentation and high-reliability sensing.
FAQ
What is the maximum shunt current rating for MAX6138CEXR50-T?
The MAX6138CEXR50-T supports up to 15mA shunt current under normal operation, with absolute maximum rating of 20mA. Exceeding 15mA risks exceeding power dissipation limits in the SC70-3 package; sustained operation above this level requires thermal derating per the 2.17mW/°C specification above +70°C ambient.
Can MAX6138CEXR50-T be used with large output capacitors?
Yes, MAX6138CEXR50-T is explicitly designed to remain stable with any output capacitance, including ceramic, tantalum, or electrolytic types of arbitrary value. This eliminates the need for output capacitors entirely, simplifying design and reducing BOM count - a key advantage confirmed in the device's electrical characteristics and typical operating circuits.
Does MAX6138CEXR50-T require a minimum load current to regulate properly?
Yes, MAX6138CEXR50-T requires a minimum shunt current of 80µA to maintain regulation within specifications. Below this threshold, reverse breakdown voltage may deviate beyond the ±0.5% initial accuracy band. The datasheet specifies IRMIN = 80µA for the MAX6138CEXR50-T variant at –40°C to +85°C.
What is the long-term stability specification for MAX6138CEXR50-T?
MAX6138CEXR50-T exhibits 120ppm reverse breakdown voltage change after 1000 hours of operation under rated conditions. This long-term stability metric reflects parametric drift under continuous bias and is measured per JEDEC JESD22-A108 methodology, supporting reliability in uncalibrated field deployments.
How does the temperature coefficient of MAX6138CEXR50-T compare to LM4040?
MAX6138CEXR50-T has a maximum temperature coefficient of 25ppm/°C over –40°C to +85°C, whereas LM4040C50IDBZR specifies 100ppm/°C. This four-fold improvement in thermal drift directly translates to tighter voltage stability across temperature - e.g., ±1.06mV vs. ±4.25mV deviation over the same range - making MAX6138CEXR50-T preferable for precision applications.
MAX6138CEXR50-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- SC-70, SOT-323
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Reference Type:
- Shunt
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Current - Output:
- 15 mA
- Tolerance:
- ±0.5%
- Temperature Coefficient:
- 25ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 80µVrms
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 80 µA
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-3
MAX6138CEXR50-T FAQ
1.How can I place an order for MAX6138CEXR50-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6138CEXR50-T 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 MAX6138CEXR50-T reliable?
The price and inventory of MAX6138CEXR50-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6138CEXR50-T is usually 5 days.
3.What payment methods are accepted for MAX6138CEXR50-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6138CEXR50-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6138CEXR50-T?
MAX6138CEXR50-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6138CEXR50-T 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 MAX6138CEXR50-T?
For technical support, including MAX6138CEXR50-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6138CEXR50-T requirements.
6.How does Aetrix verify that MAX6138CEXR50-T is sourced from the original manufacturer or authorized distributors?
All MAX6138CEXR50-T 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 MAX6138CEXR50-T meets industry standards.
7.What is the process for return or replacement of MAX6138CEXR50-T?
All MAX6138CEXR50-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6138CEXR50-T, 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 MAX6138CEXR50-T part is unused and in its original packaging.
Return procedure for MAX6138CEXR50-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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