My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX6138AEXR50+T
- Part No.:
- MAX6138AEXR50+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- SC-70, SOT-323
- Datasheet:
-
MAX6138AEXR50+T.pdf
- Description:
- IC VREF SHUNT 0.1% SC70-3
- Quantity:
- Payment:
- Shipping:
Inventory:6,042
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX6138AEXR50+T from Maxim Integrated is a precision two-terminal shunt-mode bandgap voltage reference with a fixed 5.000V reverse breakdown voltage, 0.1% initial accuracy, 25ppm/°C max temperature coefficient, and operation over –40°C to +85°C. It delivers stable regulation across 60μA–15mA shunt current and is used in high-accuracy analog signal chains of portable instrumentation and battery-powered data acquisition systems.
For engineers reviewing the MAX6138AEXR50+T datasheet, MAX6138AEXR50+T pinout, MAX6138AEXR50+T application, or MAX6138AEXR50+T equivalent, key selection criteria include guaranteed 0.1% initial tolerance, low 80µVRMS wideband noise (10Hz–10kHz), SC70-3 package compatibility, and absence of required output capacitance for stability.
Technical Context
The MAX6138AEXR50+T implements a laser-trimmed bandgap core with BiCMOS process technology to achieve tight initial accuracy and low thermal drift. Its two-terminal architecture requires only an external series resistor to regulate against varying supply and load conditions, eliminating need for feedback loops or external compensation.
It maintains stable 5.000V output under dynamic shunt-current changes (ΔVR/ΔIR ≤ 12.0mV over 1–15mA), exhibits low 1.1Ω typical dynamic impedance at 1mA, and supports capacitive loads up to ≥1µF without oscillation-enabling direct integration into ADC reference inputs and precision DAC bias networks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 5.000V ±0.5% (0.1% grade) - ensures absolute reference accuracy for 12-bit+ SAR ADCs and precision sensor front-ends. |
| Initial Accuracy | ±0.1% at +25°C - eliminates need for system-level trimming in factory-calibrated instruments. |
| Temp Coefficient | ≤25ppm/°C over –40°C to +85°C - guarantees <±0.5mV drift across industrial temperature range. |
| Shunt Current Range | 60μA to 15mA - supports ultra-low-power standby modes and high-current precision references in same design. |
| Wideband Noise | 80µVRMS (10Hz–10kHz) - minimizes noise contribution in high-resolution measurement circuits. |
| Dynamic Impedance | 0.5–1.1Ω at 120Hz - maintains voltage stability during fast load transients in multiplexed data acquisition. |
| Long-Term Stability | 120ppm after 1000h - ensures calibration retention in field-deployed medical and test equipment. |
Pinout & Package
The MAX6138AEXR50+T is housed in a 3-pin SC70-3 surface-mount package (1.8mm × 1.8mm), 50% smaller than SOT23 equivalents. Pin 3 is no-connect and must be left floating or tied to Pin 2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (+) | Positive terminal (cathode) | Connected to regulated output node; sinks shunt current to maintain 5.000V across terminals. |
| Pin 2 (–) | Negative terminal (anode) | Reference ground return path; forms two-terminal shunt interface with external series resistor. |
| Pin 3 (N.C.) | No connection | Must remain unconnected or shorted to Pin 2; no internal function or electrical tie. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small SC70-3 footprint | 1.8mm × 1.8mm area enables placement in space-constrained portable PCBs and wearable sensor modules. |
| No output capacitor required | Guaranteed stability with any capacitive load - simplifies layout and eliminates capacitor BOM cost and aging drift. |
| Low dynamic impedance | ≤1.1Ω at 120Hz - preserves reference integrity during rapid current steps in multiplexed ADC sampling. |
| Laser-trimmed bandgap core | 0.1% initial accuracy without post-package calibration - reduces manufacturing test time and yield loss. |
| Stable with capacitive loads | Operates reliably with ≥1µF ceramic output capacitance - supports low-noise filtering without instability risk. |
Applications
| Portable Medical Sensors | Industrial Data Loggers |
|---|---|
Use Scenario: Battery-powered ECG front-end measuring microvolt-level biopotentials with 16-bit resolution. IC Role / Device Role / Timing Role: Two-terminal shunt reference providing stable 5.000V excitation and ADC reference for analog signal chain. Use Value: 0.1% initial accuracy and 25ppm/°C TC ensure calibrated gain accuracy over full operating temperature without recalibration. | Use Scenario: Ruggedized environmental monitor logging temperature, humidity, and pressure over extended field deployments. IC Role / Device Role / Timing Role: Precision voltage reference for sigma-delta ADCs and sensor excitation circuitry. Use Value: 80µVRMS noise and long-term stability (<120ppm/1000h) preserve measurement repeatability across multi-year service life. |
| Handheld Test Equipment | Automotive Diagnostic Tools |
Use Scenario: Portable multimeter with autoranging and auto-zero functions requiring consistent reference across ranges. IC Role / Device Role / Timing Role: Primary shunt reference for dual-slope and successive-approximation ADC subsystems. Use Value: Wide 60μA–15mA shunt current range allows single reference to serve both low-power standby and active measurement modes. | Use Scenario: OBD-II scanner performing real-time voltage monitoring and sensor diagnostics in vehicle cabins. IC Role / Device Role / Timing Role: Stable 5.000V reference for microcontroller ADC and analog comparator thresholds. Use Value: Guaranteed operation from –40°C to +85°C and immunity to capacitive loading enable reliable performance in under-hood and cabin environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM4040C50IDBZR | 0.5% initial accuracy, 100ppm/°C TC, SOT23-3 package (2.9mm × 1.6mm) | Lower precision; higher thermal drift; larger footprint | Select when cost sensitivity outweighs accuracy and size requirements. |
| ADR3450ARJZ-R7 | 0.1% initial accuracy, 10ppm/°C TC, but 5-pin SOT23 package with enable pin and higher quiescent current | Three-terminal architecture requires additional control logic; not drop-in compatible | Choose only if system requires shutdown capability and can accommodate extra pin and layout change. |
Compared with LM4040C50IDBZR and ADR3450ARJZ-R7, the MAX6138AEXR50+T uniquely combines 0.1% accuracy, 25ppm/°C TC, and ultra-compact SC70-3 packaging in a true two-terminal configuration-enabling highest precision per mm² in space- and power-constrained designs without added control complexity.
Availability
MAX6138AEXR50+T is available at Aetrix Electronics and suitable for portable medical sensors, industrial data loggers, handheld test equipment, and automotive diagnostic tools requiring stable component supply and long-term calibration integrity.
Supply support for MAX6138AEXR50+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 is a semiconductor company specializing in analog and mixed-signal ICs for power, sensing, and communication applications.
The MAX6138 product line delivers precision shunt voltage references optimized for space-constrained, battery-powered, and high-accuracy measurement systems where minimal footprint and guaranteed parametric stability are critical.
FAQ
What is the guaranteed initial accuracy of the MAX6138AEXR50+T?
The MAX6138AEXR50+T is specified as a Grade A device with ±0.1% initial accuracy at +25°C, meaning its 5.000V output falls within 4.995V–5.005V under nominal conditions. This tolerance is laser-trimmed and guaranteed across the full –40°C to +85°C operating range per the datasheet's "Electrical Characteristics-MAX6138_50" table.
Does the MAX6138AEXR50+T require an external output capacitor for stability?
No, the MAX6138AEXR50+T does not require an external output capacitor and is explicitly characterized as stable with any capacitive load-including 0pF up to ≥1µF. This eliminates capacitor-related BOM cost, board area, and long-term drift concerns, making it ideal for high-reliability measurement systems where passive component aging affects calibration.
What is the minimum and maximum shunt current for proper regulation of the MAX6138AEXR50+T?
The MAX6138AEXR50+T requires a minimum shunt current (IRMIN) of 60μA and operates safely up to 15mA. Absolute maximum reverse current is 20mA-exceeding this risks permanent damage. The recommended operating range ensures stable 5.000V regulation while maintaining low dynamic impedance and thermal stress across all temperatures.
How does the temperature coefficient of the MAX6138AEXR50+T compare to older shunt references like the LM4040?
The MAX6138AEXR50+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 spec. This translates to <±0.5mV total drift over the full range versus >±2mV for LM4040-making MAX6138AEXR50+T suitable for applications demanding long-term accuracy without periodic recalibration.
Can Pin 3 of the MAX6138AEXR50+T be left unconnected or must it be tied to Pin 2?
Per the official datasheet Pin Description, Pin 3 of the MAX6138AEXR50+T is designated N.C. (No Connection) and must either be left floating or connected directly to Pin 2 (–). It serves no internal function, and leaving it unconnected or tying it to Pin 2 has identical electrical behavior-both configurations meet specification and ensure reliable operation of the MAX6138AEXR50+T.
MAX6138AEXR50+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):
- 5V
- Voltage - Output (Max):
- -
- Current - Output:
- 15 mA
- Tolerance:
- ±0.1%
- 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
MAX6138AEXR50+T FAQ
1.How can I place an order for MAX6138AEXR50+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6138AEXR50+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 MAX6138AEXR50+T reliable?
The price and inventory of MAX6138AEXR50+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6138AEXR50+T is usually 5 days.
3.What payment methods are accepted for MAX6138AEXR50+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6138AEXR50+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6138AEXR50+T?
MAX6138AEXR50+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6138AEXR50+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 MAX6138AEXR50+T?
For technical support, including MAX6138AEXR50+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6138AEXR50+T requirements.
6.How does Aetrix verify that MAX6138AEXR50+T is sourced from the original manufacturer or authorized distributors?
All MAX6138AEXR50+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 MAX6138AEXR50+T meets industry standards.
7.What is the process for return or replacement of MAX6138AEXR50+T?
All MAX6138AEXR50+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6138AEXR50+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 MAX6138AEXR50+T part is unused and in its original packaging.
Return procedure for MAX6138AEXR50+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX6138AEXR50+T Tags
-
TL431AIDBZR
Texas Instruments
-
TL431BQDBZR
Texas Instruments
-
AN431AN-ATRG1
Diodes Incorporated
-
LM4040CYM3-2.5-TR
Microchip Technology
-
LM4040CYM3-4.1-TR
Microchip Technology
-
LM4040EIM3-2.5/NOPB
Texas Instruments
-
AZ431LBNTR-G1
Diodes Incorporated
-
LM4040D20IDBZR
Texas Instruments
-
LM4041DIM3-ADJ/NOPB
Texas Instruments
-
LM4040DIM3X-2.5/NOPB
Texas Instruments
-
LM4040DIM3-2.5/NOPB
Texas Instruments
-
AZ431LANTR-G1
Diodes Incorporated
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
