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Analog Devices Inc./Maxim Integrated MAX6138AEXR30-T
- Part No.:
- MAX6138AEXR30-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- SC-70, SOT-323
- Datasheet:
-
MAX6138AEXR30-T.pdf
- Description:
- VOLTAGE REFERENCE
- Quantity:
- Payment:
- Shipping:
Inventory:6,609
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Product details
Overview
MAX6138AEXR30-T from Maxim Integrated is a precision 3.0V, two-terminal shunt-mode bandgap voltage reference in SC70-3 package, featuring 0.1% initial accuracy, 25ppm/°C max temperature coefficient, and 60µA–15mA operating current range. It delivers stable reverse breakdown voltage for ADC/DAC biasing, sensor excitation, and portable power monitoring circuits.
For engineers reviewing the MAX6138AEXR30-T datasheet, MAX6138AEXR30-T pinout, MAX6138AEXR30-T application, or MAX6138AEXR30-T equivalent, key selection criteria include guaranteed ±0.1% output tolerance at +25°C, low 45µVRMS wideband noise (10Hz–10kHz), no external capacitor requirement, and compatibility with capacitive loads up to 1µF.
Technical Context
The MAX6138AEXR30-T implements a laser-trimmed BiCMOS bandgap core to achieve precise 3.0000V reverse breakdown voltage with minimal thermal drift. Its two-terminal architecture operates as a programmable current sink, regulating voltage by dynamically adjusting shunt current (ISHUNT) across an external series resistor (RS).
It guarantees stability over –40°C to +85°C without output capacitance, supported by low dynamic impedance (0.3Ω typical at 1mA) and robust load-transient response. The device's N.C. pin (Pin 3) must be left floating or tied to Pin 2 - a design constraint critical for proper biasing and thermal performance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.0000V ±0.0030V at +25°C (0.1% grade); enables high-resolution 12-bit+ data conversion referencing |
| Initial Accuracy | ±0.1% (max) at +25°C; eliminates need for system-level calibration in portable instrumentation |
| Temp Coefficient | ≤25ppm/°C over –40°C to +85°C; ensures <±0.75mV drift across full industrial range |
| Operating Current | 60µA to 15mA shunt range; supports ultra-low-power sleep modes and high-current precision sensing |
| Output Noise | 45µVRMS (10Hz–10kHz); minimizes quantization error in 16-bit SAR ADC applications |
| Dynamic Impedance | 0.3Ω typical at 1mA; maintains regulation stability under fast load transients (e.g., µC wake-up bursts) |
| Long-Term Stability | 120ppm after 1000h; supports >10-year field reliability in unattended monitoring systems |
Pinout & Package
Package: SC70-3 (1.8mm × 1.8mm × 0.9mm), surface-mount, moisture-sensitive level 1. Pin 3 is No Connection (N.C.) and must be left floating or connected to Pin 2 per datasheet directive.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (+) | Anode / Positive Terminal | Connects to regulated voltage node (VREF); sinks current when reverse-biased |
| Pin 2 (–) | Cathode / Negative Terminal | Reference ground return path; defines shunt current flow direction |
| Pin 3 (N.C.) | No Connection | Must remain unconnected or shorted to Pin 2; floating N.C. prevents parasitic leakage paths |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small SC70-3 footprint | 1.8mm × 1.8mm area - 50% smaller than SOT23 equivalents, enabling dense portable PCB layouts |
| No output capacitor required | Internally compensated for stability with 0–1µF capacitive loads, reducing BOM count and layout risk |
| Wide shunt current range | 60µA–15mA operation allows single-part support of both battery-powered sensors and industrial signal chains |
| Laser-trimmed precision | 0.1% initial accuracy achieved via on-die resistor trimming, eliminating post-assembly calibration |
| Low wideband noise | 45µVRMS (10Hz–10kHz) directly improves effective number of bits (ENOB) in precision data acquisition |
Applications
| Portable Medical Sensors | Industrial Data Loggers |
|---|---|
Use Scenario: Battery-powered ECG front-end with 16-bit ADC sampling at 1kSPS. IC Role / Device Role / Timing Role: Provides stable 3.0V reference for ADC VREF and op-amp biasing. Use Value: 0.1% accuracy and 45µVRMS noise ensure ≤0.5 LSB error across temperature, meeting IEC 60601 clinical accuracy requirements. |
Use Scenario: Ruggedized environmental monitor logging temperature/humidity every 10 seconds. IC Role / Device Role / Timing Role: Supplies reference voltage for sigma-delta ADC and analog sensor conditioning. Use Value: 25ppm/°C TC and 120ppm long-term stability guarantee <±2mV drift over 5 years in uncontrolled field deployments. |
| Smartphone Power Management | Automotive Cabin Sensors |
Use Scenario: Real-time battery voltage monitoring during fast-charging cycles. IC Role / Device Role / Timing Role: References fuel-gauge ADC and charger IC feedback loop. Use Value: 60µA–15mA current range supports ultra-low quiescent current in standby and high-accuracy measurement during charge pulses. |
Use Scenario: Occupancy detection module using IR thermopile and analog signal chain. IC Role / Device Role / Timing Role: Sets precision bias point for thermopile amplifier and ADC reference. Use Value: Stable 3.0V output over –40°C to +85°C ensures consistent sensitivity calibration across automotive cabin temperature extremes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLVH431AIDBZR | 2.5V fixed output; 0.5% initial accuracy; SOT23-3 package (2.9mm × 1.6mm) | Lower precision and larger footprint; requires ≥100µA min current | Select when cost sensitivity outweighs 0.1% accuracy and SC70 size constraints |
| ADR3430ARJZ-R7 | 3.0V output; 0.1% accuracy; but series (not shunt) topology; SOT23-5 package | Requires input voltage >3.0V + dropout; incompatible with high-side sensing topologies | Choose only for low-noise series reference needs where supply headroom permits |
Compared with TLVH431AIDBZR and ADR3430ARJZ-R7, the MAX6138AEXR30-T uniquely combines 0.1% accuracy, SC70-3 size, shunt topology flexibility, and capacitor-free stability - making it optimal for space-constrained, battery-sensitive, and high-precision analog subsystems.
Availability
MAX6138AEXR30-T is available at Aetrix Electronics and suitable for portable medical sensors, industrial data loggers, and smartphone power management systems requiring stable component supply with guaranteed long-term availability.
Supply support for MAX6138AEXR30-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) designs precision analog and mixed-signal ICs for demanding industrial, medical, and communications applications.
The MAX6138 family delivers ultra-compact, high-accuracy shunt references for space-critical and low-power systems where traditional three-terminal references are impractical.
FAQ
What is the guaranteed operating temperature range for MAX6138AEXR30-T?
The MAX6138AEXR30-T is specified and production-tested over –40°C to +85°C ambient temperature. Its 25ppm/°C max temperature coefficient and 0.1% initial accuracy are guaranteed across this full industrial range, with extended junction temperature capability up to +125°C.
Can MAX6138AEXR30-T be used without an output capacitor?
Yes - the MAX6138AEXR30-T is internally compensated and does not require an external output capacitor for stability. It remains stable with any capacitive load from 0 to 1µF, simplifying layout and reducing BOM cost versus references needing external COUT.
What is the minimum shunt current required for regulation in MAX6138AEXR30-T?
The MAX6138AEXR30-T requires a minimum shunt current (ISHUNT) of 60µA to maintain regulation. This value is guaranteed across –40°C to +85°C and enables ultra-low-power operation in battery-backed or energy-harvesting systems.
How does the N.C. pin (Pin 3) affect MAX6138AEXR30-T functionality?
Pin 3 of the MAX6138AEXR30-T is a no-connect terminal. Per the datasheet, it must either remain unconnected or be tied to Pin 2 (cathode). Leaving it floating without connection to Pin 2 may cause leakage-induced regulation errors or thermal instability.
Is MAX6138AEXR30-T compatible with the LM4040 family?
The MAX6138AEXR30-T is a higher-precision, smaller-footprint replacement for the LM4040 - offering 0.1% accuracy vs. LM4040's typical 0.5–1%, and SC70-3 (1.8mm²) vs. SOT23-3 (4.6mm²). Electrical pinout differs: MAX6138AEXR30-T uses Pin 1=+, Pin 2=–, Pin 3=N.C.; LM4040 uses cathode/anode/N.C. in different order - direct PCB replacement is not possible.
MAX6138AEXR30-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):
- 3V
- Voltage - Output (Max):
- -
- Current - Output:
- 15 mA
- Tolerance:
- ±0.1%
- 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
MAX6138AEXR30-T FAQ
1.How can I place an order for MAX6138AEXR30-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6138AEXR30-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 MAX6138AEXR30-T reliable?
The price and inventory of MAX6138AEXR30-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6138AEXR30-T is usually 5 days.
3.What payment methods are accepted for MAX6138AEXR30-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6138AEXR30-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6138AEXR30-T?
MAX6138AEXR30-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6138AEXR30-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 MAX6138AEXR30-T?
For technical support, including MAX6138AEXR30-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6138AEXR30-T requirements.
6.How does Aetrix verify that MAX6138AEXR30-T is sourced from the original manufacturer or authorized distributors?
All MAX6138AEXR30-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 MAX6138AEXR30-T meets industry standards.
7.What is the process for return or replacement of MAX6138AEXR30-T?
All MAX6138AEXR30-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6138AEXR30-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 MAX6138AEXR30-T part is unused and in its original packaging.
Return procedure for MAX6138AEXR30-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX6138AEXR30-T Tags
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