My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX6138BEXR33+T
- Part No.:
- MAX6138BEXR33+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- SC-70, SOT-323
- Datasheet:
-
MAX6138BEXR33+T.pdf
- Description:
- IC VREF SHUNT 3.3V SC70
- Quantity:
- Payment:
- Shipping:
Inventory:8,128
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX6138BEXR33+T from Maxim Integrated is a precision two-terminal shunt-mode bandgap voltage reference with a fixed reverse breakdown voltage of 3.3000 V, ±0.2% initial accuracy (Grade B), 25 ppm/°C max temperature coefficient, and operation from −40°C to +85°C - used for stable biasing in portable battery-powered systems requiring low-noise, space-constrained analog signal chains.
For engineers reviewing the MAX6138BEXR33+T datasheet, MAX6138BEXR33+T pinout, MAX6138BEXR33+T application, or MAX6138BEXR33+T equivalent, key selection criteria include shunt-current range (60 µA to 15 mA), dynamic impedance (≤0.8 Ω at 1 mA), wideband noise (50 µVRMS), SC70-3 package compatibility, and absence of required output capacitance.
Technical Context
The MAX6138BEXR33+T implements a laser-trimmed bandgap core to achieve precise 3.3 V reverse breakdown voltage with guaranteed stability over industrial temperature range. Its two-terminal architecture eliminates need for external capacitors while maintaining stability under capacitive loads up to 1 µF.
It operates as a passive shunt element: current through the device (60 µA–15 mA) sets operating point, and its low dynamic impedance (0.3–0.8 Ω) ensures minimal voltage shift across load and supply variations. Temperature drift is bounded by 25 ppm/°C max, with typical performance near ±4 ppm/°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.3000 V ±0.2% (Grade B) - defines reference level for ADCs, DACs, and sensor signal conditioning circuits |
| Initial Accuracy | ±0.2% - enables single-point calibration in precision measurement systems without trimming |
| Temp Coefficient | ≤25 ppm/°C - ensures ≤±2.1 mV drift over −40°C to +85°C ambient range |
| Shunt Current Range | 60 µA to 15 mA - supports ultra-low-power standby and high-load regulation without external components |
| Dynamic Impedance | ≤0.8 Ω at 1 mA - minimizes output voltage perturbation during load transients |
| Wideband Noise | 50 µVRMS (10 Hz–10 kHz) - suitable for 12-bit to 14-bit data converters without added filtering |
| Long-Term Stability | 120 ppm after 1000 h - predictable aging behavior for mission-critical embedded instrumentation |
Pinout & Package
Package: SC70-3 (1.8 mm × 1.8 mm surface-mount), RoHS-compliant, thermal pad not present. Pin 3 is no-connect (N.C.) and must be left floating or tied to Pin 2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (+) | Positive terminal (cathode) | Reverse-biased connection point - sinks current to maintain 3.3 V across load |
| Pin 2 (−) | Negative terminal (anode) | Reference ground node - forms return path for shunt current and load current |
| Pin 3 (N.C.) | No connection | Must remain unconnected or shorted to Pin 2 - no internal function; floating improves layout flexibility |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small SC70-3 footprint | 1.8 mm × 1.8 mm - reduces PCB area by 50% vs. SOT23 equivalents, critical for wearables and compact modules |
| No output capacitor required | Stable with 0–1 µF capacitive loads - eliminates BOM item and layout risk in space-constrained designs |
| Laser-trimmed bandgap core | Guaranteed 3.3000 V ±0.2% - avoids post-assembly calibration and supports high-volume automated test |
| Low dynamic impedance | 0.3–0.8 Ω - maintains voltage regulation during fast load steps (e.g., SAR ADC sampling bursts) |
| Low wideband noise | 50 µVRMS (10 Hz–10 kHz) - preserves SNR in precision analog front-ends without additional filtering |
Applications
| Portable Medical Sensors | Notebook Computer Power Monitoring |
|---|---|
Use Scenario: Reference for 12-bit ADC measuring battery voltage and temperature in handheld glucose meters. IC Role / Device Role / Timing Role: Two-terminal shunt reference providing stable 3.3 V reference rail independent of supply ripple. Use Value: Enables <1 LSB error over full temperature range without trimming, supporting FDA-grade accuracy requirements. | Use Scenario: Voltage reference for system power-rail monitors (e.g., +3.3 V, +5 V, +12 V) in notebook EC firmware. IC Role / Device Role / Timing Role: Precision shunt reference feeding comparator inputs in multi-rail supervisor ICs. Use Value: Delivers consistent threshold detection across thermal cycles, preventing false brown-out resets during CPU boost events. |
| Industrial IoT Sensor Nodes | Automotive Cabin Control Modules |
Use Scenario: Reference for low-power sigma-delta ADCs in wireless pressure/temperature transmitters. IC Role / Device Role / Timing Role: Shunt reference biased at 100 µA to minimize quiescent current while maintaining 3.3 V accuracy. Use Value: Achieves 10-year battery life in LoRaWAN nodes while meeting ±0.5% total error budget over −40°C to +85°C. | Use Scenario: Reference for HVAC actuator position feedback circuitry in automotive cabin control units. IC Role / Device Role / Timing Role: Stable 3.3 V reference for potentiometer-based linear position sensing and microcontroller ADC input. Use Value: Maintains <±2 mV reference error across vehicle thermal soak tests (−40°C to +105°C board temp), ensuring repeatable actuator positioning. |
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 | 3.0 V nominal, ±0.5% initial accuracy, higher 100 ppm/°C TC, SOT-23-3 package | Lower precision; suited for non-critical biasing where 3.0 V suffices | Select when cost sensitivity outweighs accuracy needs and 3.0 V matches system design |
| ADR3433ARJZ-R7 | 3.3 V, ±0.1% initial accuracy, 10 ppm/°C TC, but 5-pin SOT-23 package with enable pin | Higher precision and lower drift, but requires enable control and larger footprint | Choose for metrology-grade applications needing tighter drift control and active power management |
Compared with TLVH431ACDBVR and ADR3433ARJZ-R7, the MAX6138BEXR33+T offers optimal balance of 3.3 V accuracy (±0.2%), ultra-small SC70-3 size, and zero-capacitor stability - making it ideal for compact, battery-operated systems where layout area and component count are constrained.
Availability
MAX6138BEXR33+T is available at Aetrix Electronics and suitable for portable medical sensors, notebook computer power monitoring, and industrial IoT sensor nodes requiring stable component supply with guaranteed long-term availability.
Supply support for MAX6138BEXR33+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, interface, and timing applications - acquired by Analog Devices in 2021 but retaining distinct product branding and support infrastructure.
The MAX6138 series was designed specifically for space-constrained, battery-powered systems needing high-accuracy, low-drift, two-terminal shunt references - targeting portable instrumentation, industrial sensors, and computing power management.
FAQ
What is the maximum shunt current rating for MAX6138BEXR33+T?
The MAX6138BEXR33+T supports a continuous shunt current range of 60 µA to 15 mA. Absolute maximum reverse current is 20 mA - exceeding this risks permanent damage. For reliable operation, ISHUNT must stay within 60 µA–15 mA across all temperatures and load conditions. The device's dynamic impedance remains low (≤0.8 Ω) throughout this range, ensuring stable 3.3 V regulation in the MAX6138BEXR33+T.
Does MAX6138BEXR33+T require an external output capacitor?
No, the MAX6138BEXR33+T does not require an external output capacitor for stability. It is explicitly characterized and guaranteed stable with capacitive loads from 0 to 1 µF. This eliminates a common BOM item and simplifies layout - especially valuable in ultra-compact designs where every mm² matters. The MAX6138BEXR33+T achieves this via internal compensation optimized for its bandgap architecture and SC70-3 parasitics.
What is the temperature coefficient specification for MAX6138BEXR33+T?
The MAX6138BEXR33+T has a guaranteed maximum temperature coefficient of 25 ppm/°C over −40°C to +85°C. Typical performance is tighter - often ±4 ppm/°C - but design margins must use the 25 ppm/°C limit. This translates to a worst-case voltage drift of ±2.1 mV across the full temperature range. The MAX6138BEXR33+T achieves this via laser-trimmed resistor networks and bandgap curvature correction.
How is pin 3 used on the MAX6138BEXR33+T SC70-3 package?
Pin 3 of the MAX6138BEXR33+T is designated N.C. (No Connection). It must be left electrically floating or connected directly to Pin 2 (anode/−). It serves no internal function and is included for mechanical symmetry and package standardization. Leaving Pin 3 unconnected does not affect electrical performance. This configuration is confirmed in the official MAX6138BEXR33+T datasheet pin description and typical operating circuit diagrams.
What is the long-term stability of MAX6138BEXR33+T after 1000 hours?
The MAX6138BEXR33+T exhibits a maximum reverse breakdown voltage shift of 120 ppm after 1000 hours of operation - equivalent to ±0.4 mV at 3.3 V. This value reflects parametric drift under accelerated stress conditions and is representative of field reliability in properly biased circuits. Long-term stability is consistent across all MAX6138BEXR33+T units and is specified in the Electrical Characteristics table of the official datasheet.
MAX6138BEXR33+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):
- 3.3V
- Voltage - Output (Max):
- -
- Current - Output:
- 15 mA
- Tolerance:
- ±0.2%
- Temperature Coefficient:
- 25ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 50µVrms
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 67 µA
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-3
MAX6138BEXR33+T FAQ
1.How can I place an order for MAX6138BEXR33+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6138BEXR33+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 MAX6138BEXR33+T reliable?
The price and inventory of MAX6138BEXR33+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6138BEXR33+T is usually 5 days.
3.What payment methods are accepted for MAX6138BEXR33+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6138BEXR33+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6138BEXR33+T?
MAX6138BEXR33+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6138BEXR33+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 MAX6138BEXR33+T?
For technical support, including MAX6138BEXR33+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6138BEXR33+T requirements.
6.How does Aetrix verify that MAX6138BEXR33+T is sourced from the original manufacturer or authorized distributors?
All MAX6138BEXR33+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 MAX6138BEXR33+T meets industry standards.
7.What is the process for return or replacement of MAX6138BEXR33+T?
All MAX6138BEXR33+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6138BEXR33+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 MAX6138BEXR33+T part is unused and in its original packaging.
Return procedure for MAX6138BEXR33+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX6138BEXR33+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…
