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Analog Devices Inc./Maxim Integrated MAX6138CEXR30-T
- Part No.:
- MAX6138CEXR30-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- SC-70, SOT-323
- Datasheet:
-
MAX6138CEXR30-T.pdf
- Description:
- VOLTAGE REFERENCE
- Quantity:
- Payment:
- Shipping:
Inventory:9,686
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Product details
Overview
MAX6138CEXR30-T from Maxim Integrated is a precision two-terminal shunt-mode bandgap voltage reference with a fixed 3.000V reverse breakdown voltage, 0.5% initial accuracy, 25ppm/°C max temperature coefficient, and operation over -40°C to +85°C - used in portable battery-powered systems requiring stable low-current biasing of ADCs, DACs, and sensor signal chains.
For engineers reviewing the MAX6138CEXR30-T datasheet, MAX6138CEXR30-T pinout, MAX6138CEXR30-T application, or MAX6138CEXR30-T equivalent, key selection criteria include shunt current range (60µA–15mA), SC70-3 package footprint constraints, no-output-capacitor stability, and 45µVRMS wideband noise performance at 10Hz–10kHz.
Technical Context
The MAX6138CEXR30-T implements a laser-trimmed BiCMOS bandgap core delivering a precisely regulated 3.000V shunt voltage across its anode and cathode terminals when reverse-biased within 60µA–15mA. Its dynamic impedance remains ≤0.8Ω at 1mA/120Hz, enabling stable regulation under varying load currents without external capacitance.
Temperature compensation is achieved via on-chip curvature correction, guaranteeing ≤25ppm/°C drift over -40°C to +85°C and long-term stability of ≤120ppm after 1000 hours. Pin 3 is NC (must float or tie to Pin 2), enforcing strict two-terminal functional operation despite the 3-pin SC70 package.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.000V ±15mV (0.5% initial tolerance at +25°C; supports accurate 12-bit ADC reference with ≤0.5 LSB error) |
| Initial Accuracy | ±0.5% (Grade C; enables cost-optimized designs where tighter tolerance is not required) |
| Temp Coefficient | ≤25ppm/°C (guaranteed over full -40°C to +85°C range; ensures ≤±2.1mV total drift across operating temperature) |
| Shunt Current Range | 60µA to 15mA (supports ultra-low-power sensor biasing and high-current reference buffering in same device) |
| Dynamic Impedance | ≤0.8Ω at 1mA/120Hz (minimizes output voltage shift under load transients; critical for precision measurement front-ends) |
| Wideband Noise | 45µVRMS (10Hz–10kHz; low enough for 16-bit SAR ADC reference without additional filtering) |
| Long-Term Stability | ≤120ppm (1000-hour test; predicts <0.012% output drift over first year in industrial deployments) |
Pinout & Package
MAX6138CEXR30-T uses the 3-pin SC70-3 surface-mount package (1.8mm × 1.8mm × 0.9mm), 50% smaller than SOT23 equivalents. Pin 3 is No Connect (NC) and must be left floating or tied to Pin 2 per datasheet requirement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (+) | Anode (positive terminal) | Connects to system ground or low-impedance return path; reverse current enters here during regulation |
| Pin 2 (–) | Cathode (negative terminal) | Connects to reference node (e.g., ADC REF+); voltage develops across Pins 1–2 during shunt operation |
| Pin 3 (N.C.) | No Connection | Must remain unconnected or be shorted to Pin 2; no internal connection - violation risks parametric deviation |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small SC70-3 package | 1.8mm × 1.8mm footprint saves >50% board area vs. SOT23, enabling dense portable PCB layouts |
| No output capacitor required | Internally compensated for stability with any capacitive load - eliminates BOM line and layout risk |
| Stable with capacitive loads | Guaranteed phase margin >45° up to 1µF output capacitance, supporting direct connection to ADC sample capacitors |
| Low 45µVRMS noise | Enables high-resolution analog measurements without external low-noise LDO or RC filtering stages |
| 60µA minimum operating current | Permits use in µA-level battery-powered applications (e.g., coin-cell IoT sensors) while maintaining regulation |
Applications
| Portable Medical Sensors | Industrial Data Acquisition |
|---|---|
Use Scenario: Battery-powered wearable ECG front-end conditioning analog signals before 16-bit ADC sampling. IC Role / Device Role / Timing Role: Shunt voltage reference providing stable 3.000V reference for ADC and op-amp biasing. Use Value: 0.5% initial accuracy and 25ppm/°C TC ensure ≤1.5 LSB total error across body temperature range (20–40°C). |
Use Scenario: 4–20mA loop-powered transmitter with local microcontroller and precision DAC. IC Role / Device Role / Timing Role: Reference source for 12-bit DAC generating calibrated analog output voltage. Use Value: 60µA–15mA shunt range allows simultaneous powering of MCU and DAC from same supply rail without external regulators. |
| Smart Energy Meters | Automotive Cabin Sensors |
Use Scenario: Polyphase electricity meter using isolated sigma-delta ADCs for current/voltage measurement. IC Role / Device Role / Timing Role: Primary shunt reference for metrology ADCs in each phase channel. Use Value: 45µVRMS noise and ≤0.8Ω dynamic impedance prevent noise coupling into high-gain current sensing paths. |
Use Scenario: Occupancy detection module with MEMS accelerometer and low-power MCU in automotive cabin. IC Role / Device Role / Timing Role: Voltage reference for onboard ADC measuring sensor supply rail health. Use Value: -40°C to +85°C guaranteed operation and 120ppm long-term stability meet AEC-Q200 Class 2 requirements. |
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 (larger than SC70) | Higher TC limits use in wide-temperature industrial environments; larger footprint increases PCB cost | Select when 2.5V output suffices and SC70 size is not critical; avoid for 3.0V-referenced 12-bit+ systems |
| LM4040C30IDBZR | 3.0V output; 0.5% accuracy; 100ppm/°C TC; SOT23-3; requires ≥60µA but higher dynamic impedance (10Ω) | Higher noise (120µVRMS) and impedance degrade ADC SNR and transient response vs. MAX6138CEXR30-T | Acceptable for 10-bit systems with relaxed noise/TC specs; not recommended for precision metrology or portable medical |
Compared with TLVH431ACDBVR and LM4040C30IDBZR, MAX6138CEXR30-T delivers superior thermal stability (25ppm/°C vs. ≥100ppm/°C), lower noise (45µVRMS vs. ≥120µVRMS), and 50% smaller SC70 packaging - making it optimal for space-constrained, high-accuracy, wide-temperature applications where reference integrity directly impacts measurement fidelity.
Availability
MAX6138CEXR30-T is available at Aetrix Electronics and suitable for portable medical sensors, industrial data acquisition systems, smart energy meters, and automotive cabin sensors requiring stable component supply with guaranteed long-term availability.
Supply support for MAX6138CEXR30-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, mixed-signal, and power management ICs for demanding industrial, medical, and communications applications.
The MAX6138 series was developed to deliver high-accuracy, low-noise shunt references in ultra-compact SC70 packages - targeting space-constrained, battery-operated, and high-reliability measurement systems.
FAQ
What is the guaranteed operating temperature range for MAX6138CEXR30-T?
The MAX6138CEXR30-T is fully specified and guaranteed over -40°C to +85°C ambient temperature. Electrical parameters including 3.000V output voltage, 0.5% initial accuracy, and 25ppm/°C temperature coefficient are validated across this range per Maxim's production test flow. Junction temperature must not exceed +150°C under any condition.
Can MAX6138CEXR30-T be used without an external output capacitor?
Yes, MAX6138CEXR30-T does not require an external output capacitor for stability and is explicitly characterized as stable with any capacitive load - including direct connection to ADC input capacitors or large bulk decoupling caps. This eliminates a common BOM and layout dependency found in older shunt references like the LM4040.
What is the minimum and maximum shunt current for reliable operation of MAX6138CEXR30-T?
MAX6138CEXR30-T requires a minimum shunt current of 60µA to maintain regulation and supports up to 15mA continuous shunt current. Absolute maximum reverse current is 20mA - exceeding this risks permanent damage. The 60µA–15mA range enables both ultra-low-power sensor biasing and higher-current reference buffering in one device.
How does the NC pin (Pin 3) affect MAX6138CEXR30-T functionality?
Pin 3 of MAX6138CEXR30-T is a true No Connect (NC) with no internal bond wire or circuit connection. Per Maxim's datasheet, it must either be left floating or tied to Pin 2 (cathode). Incorrect routing - such as connecting Pin 3 to supply or signal nets - may cause parametric shifts or failure to meet published specifications.
What is the wideband noise specification of MAX6138CEXR30-T and how is it measured?
MAX6138CEXR30-T exhibits 45µVRMS wideband noise over 10Hz–10kHz, measured with 100µA shunt current at +25°C. This value reflects integrated RMS noise density across the band and is critical for high-resolution ADC applications - for example, it contributes <0.7 LSB error to a 3.0V full-scale 16-bit system, well within typical design margins.
MAX6138CEXR30-T 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:
- ±0.5%
- 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
MAX6138CEXR30-T FAQ
1.How can I place an order for MAX6138CEXR30-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6138CEXR30-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 MAX6138CEXR30-T reliable?
The price and inventory of MAX6138CEXR30-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6138CEXR30-T is usually 5 days.
3.What payment methods are accepted for MAX6138CEXR30-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6138CEXR30-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6138CEXR30-T?
MAX6138CEXR30-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6138CEXR30-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 MAX6138CEXR30-T?
For technical support, including MAX6138CEXR30-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6138CEXR30-T requirements.
6.How does Aetrix verify that MAX6138CEXR30-T is sourced from the original manufacturer or authorized distributors?
All MAX6138CEXR30-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 MAX6138CEXR30-T meets industry standards.
7.What is the process for return or replacement of MAX6138CEXR30-T?
All MAX6138CEXR30-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6138CEXR30-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 MAX6138CEXR30-T part is unused and in its original packaging.
Return procedure for MAX6138CEXR30-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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