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Analog Devices Inc./Maxim Integrated MAX6138CEXR25+T
- Part No.:
- MAX6138CEXR25+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- SC-70, SOT-323
- Datasheet:
-
MAX6138CEXR25+T.pdf
- Description:
- IC VREF SHUNT 0.5% SC70-3
- Quantity:
- Payment:
- Shipping:
Inventory:6,903
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Product details
Overview
MAX6138CEXR25+T from Maxim Integrated is a precision two-terminal shunt-mode bandgap voltage reference with a fixed reverse breakdown voltage of 2.5000V, ±0.5% initial accuracy, 25ppm/°C max temperature coefficient over –40°C to +85°C, 60μA–15mA operating current range, and ultra-small SC70-3 package (1.8mm × 1.8mm). It serves as a stable voltage reference in low-power analog signal chains and ADC/DAC biasing circuits.
For engineers reviewing the MAX6138CEXR25+T datasheet, MAX6138CEXR25+T pinout, MAX6138CEXR25+T application, or MAX6138CEXR25+T equivalent, key selection criteria include guaranteed 25ppm/°C TC, no-output-capacitor stability, 2.5V output tolerance across full temperature and current range, and compatibility with space-constrained portable designs requiring high long-term stability (120ppm @ 1000h).
Technical Context
The MAX6138CEXR25+T implements a laser-trimmed bandgap core to achieve precise 2.5000V reverse breakdown voltage with minimal drift. Its two-terminal architecture eliminates need for external feedback or supply regulation, simplifying integration into shunt-regulated topologies.
It operates as a programmable current sink-maintaining constant cathode-to-anode voltage by dynamically adjusting shunt current between 60μA and 15mA-enabling stable reference generation even with varying load currents and input supply fluctuations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.5000V ±0.5% at +25°C; maintains tight regulation across –40°C to +85°C and 60μA–15mA shunt current. |
| Temp Coefficient | ≤25ppm/°C (max) over –40°C to +85°C; ensures ≤±2.1mV total drift across full industrial temperature range. |
| Shunt Current Range | 60μA to 15mA; supports operation from ultra-low-power sensor interfaces up to moderate-current data converters. |
| Dynamic Impedance | 0.3Ω to 0.8Ω at 1mA/120Hz; provides low AC impedance for high-PSRR reference performance in noisy environments. |
| Wideband Noise | 35µVRMS (10Hz–10kHz); enables use in 16-bit+ SAR and delta-sigma ADC reference paths without added filtering. |
| Long-Term Stability | 120ppm after 1000 hours; guarantees predictable aging behavior for mission-critical instrumentation applications. |
| Capacitive Load Stability | Stable with any output capacitance; eliminates need for external compensation capacitor in layout-sensitive designs. |
Pinout & Package
The MAX6138CEXR25+T is housed in a 3-pin SC70-3 surface-mount package (1.8mm × 1.8mm), with pin 3 designated as no-connect (N.C.)-must be left floating or tied to pin 2 per datasheet requirement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (+) | Positive terminal (cathode) | Connected to regulated voltage node; sinks shunt current to maintain 2.5000V across terminals. |
| 2 (–) | Negative terminal (anode) | Reference ground return path; forms voltage measurement point for feedback networks. |
| 3 (N.C.) | No connection | Must remain unconnected or shorted to pin 2; not internally bonded-floating or tied to anode avoids parasitic coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small SC70-3 footprint | 1.8mm × 1.8mm area-50% smaller than SOT23 equivalents-enables high-density PCB layouts in portable electronics. |
| Guaranteed 25ppm/°C TC | Specified over full –40°C to +85°C range-not typical-only-ensures design margin for industrial temperature cycling. |
| No output capacitor required | Internally compensated for unconditional stability with any capacitive load, reducing BOM count and layout risk. |
| Laser-trimmed initial accuracy | 0.5% max error at +25°C (C-grade), achieved via post-package trimming-no calibration needed in end system. |
| Low 35µVRMS noise | Measured 10Hz–10kHz; directly supports 16-bit ADCs without external low-noise filtering stages. |
Applications
| Portable Medical Sensors | Industrial Data Acquisition |
|---|---|
Use Scenario: Battery-powered handheld glucose meters and pulse oximeters requiring stable 2.5V reference for analog front-end amplifiers and 12–16-bit ADCs. IC Role / Device Role / Timing Role: Two-terminal shunt reference providing precise 2.5000V bias for sensor signal conditioning and digitization. Use Value: Enables >14 ENOB performance over –20°C to +50°C ambient with no external capacitor, extending battery life via ultra-low 60μA quiescent operation. | Use Scenario: Modular PLC analog input modules measuring 4–20mA current loops and thermocouple signals across –40°C to +70°C ambient. IC Role / Device Role / Timing Role: Precision voltage reference for isolated sigma-delta ADCs and programmable gain instrumentation amplifiers. Use Value: Guarantees ≤±0.5% total error contribution over full temperature range and 10-year field life, meeting IEC 61000-4-3 immunity requirements. |
| Automotive Cabin Controllers | Test & Measurement Equipment |
Use Scenario: HVAC control units and infotainment power management ICs needing robust 2.5V reference under automotive load-dump and cold-crank conditions. IC Role / Device Role / Timing Role: Shunt reference stabilizing internal LDO feedback and microcontroller ADC references in AEC-Q100-compliant subsystems. Use Value: Maintains regulation down to 60μA shunt current-critical during battery brownouts-and survives 30V transients due to inherent zener-like clamping behavior. | Use Scenario: Benchtop multimeters and automated test equipment requiring traceable 2.5V reference with <10ppm/°C effective drift in temperature-controlled enclosures. IC Role / Device Role / Timing Role: Primary voltage standard for self-calibration routines and high-resolution DAC output verification. Use Value: Delivers 120ppm long-term stability (1000h) and 25ppm/°C TC-enabling 6½-digit accuracy without periodic recalibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM4040C25IDBZR | 0.5% initial accuracy, 100ppm/°C TC (max), SOT23-3 package (2.9mm × 1.6mm), requires ≥65μA min shunt current. | Higher temp drift limits use in wide-temperature industrial systems; larger footprint constrains ultra-compact designs. | Select when cost sensitivity outweighs size and temperature stability requirements. |
| ADR3425ARJZ-R7 | 0.1% initial accuracy, 10ppm/°C TC (max), SC70-5 package (2.0mm × 2.1mm), 3-terminal series topology requiring external resistor. | Lower drift and tighter accuracy-but adds complexity, board area, and sensitivity to resistor tolerance and thermal gradients. | Select when highest precision is mandatory and layout allows extra passive components and routing. |
Compared with LM4040C25IDBZR, MAX6138CEXR25+T delivers 4× better temperature stability in 40% smaller area; versus ADR3425ARJZ-R7, it trades 0.4% accuracy for simplified two-terminal operation, lower noise sensitivity, and reduced component count-ideal for cost- and space-constrained production systems.
Availability
MAX6138CEXR25+T is available at Aetrix Electronics and suitable for portable medical sensors, industrial data acquisition modules, and automotive cabin controllers requiring stable component supply with guaranteed long-term availability.
Supply support for MAX6138CEXR25+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, automotive, and communications applications.
The MAX6138 product line delivers high-accuracy, low-drift shunt voltage references optimized for space-constrained, battery-operated, and high-reliability systems where stability, size, and simplicity are critical.
FAQ
What is the guaranteed initial accuracy of the MAX6138CEXR25+T?
The MAX6138CEXR25+T is a C-grade device with guaranteed ±0.5% initial accuracy at +25°C, verified across production lots per Maxim's datasheet specifications. This tolerance applies specifically to the 2.5000V output voltage and remains valid over the full –40°C to +85°C operating temperature range as confirmed in the Electrical Characteristics table for MAX6138_25 (2.5V variant).
Does the MAX6138CEXR25+T require an external output capacitor?
No, the MAX6138CEXR25+T does not require an external output capacitor for stability. Its internal design ensures unconditional stability with any capacitive load-including zero capacitance-eliminating the need for external compensation components and simplifying layout in noise-sensitive applications like precision ADC reference paths.
What is the minimum shunt current required for regulation in the MAX6138CEXR25+T?
The MAX6138CEXR25+T requires a minimum shunt current of 60μA to maintain regulation at 2.5000V, as specified in the Electrical Characteristics table for the MAX6138_25 variant. This value is guaranteed across –40°C to +85°C and ensures stable operation even in ultra-low-power modes such as sleep states in portable equipment.
How does the temperature coefficient of the MAX6138CEXR25+T compare to older shunt references like the LM4040?
The MAX6138CEXR25+T has a guaranteed maximum temperature coefficient of 25ppm/°C over –40°C to +85°C, significantly tighter than the LM4040's typical 100ppm/°C (max) spec. This 4× improvement reduces total voltage drift across temperature-e.g., from ±20.5mV to ±2.1mV for a 2.5V reference-making MAX6138CEXR25+T suitable for higher-precision industrial and instrumentation applications.
What is the function of pin 3 on the MAX6138CEXR25+T SC70-3 package?
Pin 3 of the MAX6138CEXR25+T is designated N.C. (No Connection) and must be left floating or connected to pin 2 (anode) as explicitly stated in the Pin Description section of the datasheet. It is not internally bonded; improper connection-such as tying to a different potential-can introduce leakage paths or measurement errors in precision reference applications.
MAX6138CEXR25+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- SC-70, SOT-323
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Reference Type:
- Shunt
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- -
- Current - Output:
- 15 mA
- Tolerance:
- ±0.5%
- Temperature Coefficient:
- 25ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 35µVrms
- 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
MAX6138CEXR25+T FAQ
1.How can I place an order for MAX6138CEXR25+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6138CEXR25+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 MAX6138CEXR25+T reliable?
The price and inventory of MAX6138CEXR25+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6138CEXR25+T is usually 5 days.
3.What payment methods are accepted for MAX6138CEXR25+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6138CEXR25+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6138CEXR25+T?
MAX6138CEXR25+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6138CEXR25+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 MAX6138CEXR25+T?
For technical support, including MAX6138CEXR25+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6138CEXR25+T requirements.
6.How does Aetrix verify that MAX6138CEXR25+T is sourced from the original manufacturer or authorized distributors?
All MAX6138CEXR25+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 MAX6138CEXR25+T meets industry standards.
7.What is the process for return or replacement of MAX6138CEXR25+T?
All MAX6138CEXR25+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6138CEXR25+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 MAX6138CEXR25+T part is unused and in its original packaging.
Return procedure for MAX6138CEXR25+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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