My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX6138BEXR50-T
- Part No.:
- MAX6138BEXR50-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- SC-70, SOT-323
- Datasheet:
-
MAX6138BEXR50-T.pdf
- Description:
- VOLTAGE REFERENCE
- Quantity:
- Payment:
- Shipping:
Inventory:15,914
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX6138BEXR50-T from Maxim Integrated is a precision two-terminal shunt-mode bandgap voltage reference with a fixed 5.000V reverse breakdown voltage, 0.2% initial accuracy, and 25ppm/°C max temperature coefficient over –40°C to +85°C. It delivers stable regulation across 60µA–15mA shunt current and operates without external capacitors in space-constrained portable systems.
For engineers reviewing the MAX6138BEXR50-T datasheet, MAX6138BEXR50-T pinout, MAX6138BEXR50-T application, or MAX6138BEXR50-T equivalent, key selection criteria include shunt-current range, low dynamic impedance (0.5–1.1Ω), wideband noise (80µVRMS), SC70-3 package footprint (1.8mm × 1.8mm), and compatibility with capacitive loads up to 1µF.
Technical Context
The MAX6138BEXR50-T implements a laser-trimmed BiCMOS bandgap core to achieve precise 5.000V output with guaranteed 0.2% initial tolerance and ±25ppm/°C tempco over industrial temperature range. Its two-terminal architecture requires no input supply rail-only a series resistor to bias the cathode-anode path.
It maintains regulation under varying load conditions via low dynamic impedance (0.5Ω typ at 1mA) and exhibits stable transient response even with 1kΩ–100kΩ load resistances and 100µA–10mA shunt currents. The device remains stable with any output capacitance, eliminating need for external stabilization.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 5.000V ±0.2% at +25°C - ensures accurate ADC/DAC reference or feedback node in precision analog circuits |
| Temperature Coefficient | ≤25ppm/°C - limits voltage drift to ±2.1mV over –40°C to +85°C operating range |
| Shunt Current Range | 60µA to 15mA - supports ultra-low-power sensor nodes and high-current regulator feedback loops |
| Dynamic Impedance | 0.5Ω to 1.1Ω at 1mA - minimizes output voltage perturbation during load transients |
| Wideband Noise | 80µVRMS (10Hz–10kHz) - suitable for 12-bit to 14-bit data acquisition without added filtering |
| Long-Term Stability | 120ppm after 1000h - enables reliable performance in unattended industrial monitoring systems |
| Package | SC70-3 (1.8mm × 1.8mm) - saves >50% board area vs. SOT23 while maintaining thermal performance |
Pinout & Package
MAX6138BEXR50-T uses a 3-pin SC70 surface-mount package. Pin 3 is NC (no connection) and must be left floating or tied to Pin 2 per datasheet requirement. The device operates as a two-terminal shunt reference: Pins 1 (+) and 2 (–) form the cathode-anode path.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Cathode (+) | Connected to higher-potential node; sinks shunt current to maintain regulated 5.000V across terminals |
| Pin 2 | Anode (–) | Reference ground return; forms current path with Pin 1 to establish stable reverse breakdown voltage |
| Pin 3 | No Connection (NC) | Must remain unconnected or shorted to Pin 2; not electrically active and carries no signal or power function |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small SC70-3 package | 1.8mm × 1.8mm footprint - enables integration into wearables, hearing aids, and compact IoT sensors |
| No output capacitor required | Stable with 0–1µF capacitive loads - eliminates BOM cost, layout area, and reliability risk of external C |
| Low dynamic impedance | 0.5Ω typical at 1mA - improves PSRR and reduces output voltage sag during fast load steps |
| Laser-trimmed accuracy | 0.2% initial tolerance - reduces calibration overhead in factory test and field recalibration cycles |
| Wide shunt current range | 60µA–15mA operation - supports both battery-powered microamps and industrial mA-level feedback paths |
Applications
| Portable Medical Sensors | Industrial Data Acquisition |
|---|---|
Use Scenario: Battery-powered ECG front-end with 14-bit SAR ADC requiring stable 5V reference. IC Role / Device Role / Timing Role: Shunt voltage reference providing precise 5.000V reference for ADC VREF and op-amp biasing. Use Value: 0.2% initial accuracy and 25ppm/°C tempco ensure <0.5 LSB error over full temperature range without software correction. |
Use Scenario: 4–20mA loop-powered transmitter with microcontroller-based signal conditioning. IC Role / Device Role / Timing Role: Two-terminal shunt reference generating stable 5V for DAC output scaling and sensor excitation. Use Value: 60µA–15mA shunt range allows operation across full loop current range while maintaining regulation. |
| Smart Meter Analog Front-End | Automotive Cabin Sensor Hub |
Use Scenario: Polyphase electricity meter using isolated ADCs for voltage/current measurement. IC Role / Device Role / Timing Role: Primary shunt reference supplying 5.000V to isolated sigma-delta ADC reference inputs. Use Value: 80µVRMS noise and low dynamic impedance prevent noise coupling into high-resolution metrology measurements. |
Use Scenario: Compact cabin air quality module with CO₂, humidity, and VOC sensors. IC Role / Device Role / Timing Role: Space-optimized voltage reference powering sensor signal chains and MCU ADC reference. Use Value: SC70-3 package fits tight 8mm² PCB real estate while delivering stable 5V across automotive temperature range. |
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 programmable; 0.5% initial accuracy; 100ppm/°C tempco | Requires external resistor divider for 5V setting; higher tempco increases drift in wide-temp environments | Select when design flexibility (adjustable VREF) outweighs precision and thermal stability requirements |
| LM4040C50IDCKR | SOT23-3 shunt reference; 5.0V ±0.5%; 100ppm/°C; 60µA–15mA range; larger 2.9mm × 1.6mm footprint | Same electrical interface but 50% larger package; higher tempco degrades accuracy in industrial ambient | Select only if SC70 footprint is unavailable and 0.5% tolerance is acceptable for system calibration budget |
Compared with TLVH431ACDBVR and LM4040C50IDCKR, MAX6138BEXR50-T offers superior thermal stability (25ppm/°C vs. 100ppm/°C), tighter initial accuracy (0.2% vs. 0.5%), and 50% smaller footprint-making it optimal for high-precision, space-constrained applications where long-term drift and board area are critical.
Availability
MAX6138BEXR50-T is available at Aetrix Electronics and suitable for portable medical sensors, industrial data acquisition systems, smart meter analog front-ends, and automotive cabin sensor hubs requiring stable component supply with consistent parametric performance across production lots.
Supply support for MAX6138BEXR50-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 family delivers high-accuracy, low-drift shunt references in ultra-compact SC70 packages-engineered specifically for battery-powered and space-constrained systems needing stable voltage references without external capacitors.
FAQ
What is the output voltage tolerance of MAX6138BEXR50-T over temperature?
MAX6138BEXR50-T guarantees 5.000V ±0.2% initial accuracy at +25°C and maintains ≤25ppm/°C temperature coefficient over –40°C to +85°C. This results in a maximum total deviation of ±2.1mV across the full industrial temperature range, confirmed by box-method testing per datasheet Note 2.
Can MAX6138BEXR50-T operate without an external capacitor?
Yes, MAX6138BEXR50-T is internally compensated and stable with any output capacitance from 0 to 1µF. No external capacitor is required for stability-this eliminates BOM cost, PCB area, and potential failure modes associated with ceramic capacitor aging or microphonics in sensitive analog circuits.
What is the minimum shunt current required for regulation in MAX6138BEXR50-T?
MAX6138BEXR50-T requires a minimum shunt current of 60µA to maintain regulation at 5.000V. Below this threshold, output voltage drops nonlinearly. The datasheet specifies IRMIN = 60µA (typical 80µA) for the 5.0V variant, verified across –40°C to +85°C with 100% production testing at +25°C.
How does the NC pin (Pin 3) affect MAX6138BEXR50-T functionality?
Pin 3 of MAX6138BEXR50-T is a no-connect terminal. It must either remain unconnected or be tied directly to Pin 2 (anode). Leaving Pin 3 floating without connection to Pin 2 violates the absolute maximum rating and may cause unpredictable behavior or damage due to internal parasitic paths in the SC70 die.
Is MAX6138BEXR50-T compatible with capacitive loads in precision ADC reference applications?
Yes, MAX6138BEXR50-T is explicitly characterized and guaranteed stable with capacitive loads up to 1µF. Its low dynamic impedance (0.5–1.1Ω) and internal compensation eliminate ringing or oscillation when driving ADC reference inputs, sample-and-hold capacitors, or filter networks-enabling direct connection without series resistance or isolation components.
MAX6138BEXR50-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:
- ±0.2%
- 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
MAX6138BEXR50-T FAQ
1.How can I place an order for MAX6138BEXR50-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6138BEXR50-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 MAX6138BEXR50-T reliable?
The price and inventory of MAX6138BEXR50-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6138BEXR50-T is usually 5 days.
3.What payment methods are accepted for MAX6138BEXR50-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6138BEXR50-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6138BEXR50-T?
MAX6138BEXR50-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6138BEXR50-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 MAX6138BEXR50-T?
For technical support, including MAX6138BEXR50-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6138BEXR50-T requirements.
6.How does Aetrix verify that MAX6138BEXR50-T is sourced from the original manufacturer or authorized distributors?
All MAX6138BEXR50-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 MAX6138BEXR50-T meets industry standards.
7.What is the process for return or replacement of MAX6138BEXR50-T?
All MAX6138BEXR50-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6138BEXR50-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 MAX6138BEXR50-T part is unused and in its original packaging.
Return procedure for MAX6138BEXR50-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX6138BEXR50-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…
