My Inquiry
My Account
Analog Devices Inc./Maxim Integrated LM4051BIM3-1.2-T
- Part No.:
- LM4051BIM3-1.2-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4051BIM3-1.2-T.pdf
- Description:
- PRECISION MICROPOWER SHUNT VREF
- Quantity:
- Payment:
- Shipping:
Inventory:32,500
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM4051BIM3-1.2-T from Maxim Integrated is a precision 1.225V shunt voltage reference in SC70-3 package, featuring ±0.2% initial accuracy, 50ppm/°C max temperature coefficient, and stable operation from −40°C to +125°C. It delivers 28µVRMS wideband noise (10Hz–10kHz), supports 60µA–15mA shunt current, and requires no output capacitor while tolerating any capacitive load - ideal for space-constrained battery-powered analog signal chains.
For engineers reviewing the LM4051BIM3-1.2-T datasheet, LM4051BIM3-1.2-T pinout, LM4051BIM3-1.2-T application, or LM4051BIM3-1.2-T equivalent, this page provides verified specifications, validated pin functions, real-world use cases in portable instrumentation and industrial sensing, and two confirmed alternative parts with documented performance trade-offs.
Technical Context
The LM4051BIM3-1.2-T implements a bandgap-based shunt reference architecture, behaving electrically like a precision Zener diode with reverse breakdown at 1.225V. Its internal laser-trimmed resistor network ensures ±0.2% initial accuracy across temperature, and its BiCMOS process enables low dynamic impedance (≤1.5Ω at 1mA) and ultra-low 28µVRMS noise.
It operates over a 60µA–15mA shunt current range without external stabilization, maintaining regulation stability under varying load capacitance and supply conditions. The device clamps to ~0.7V below ground under forward bias up to 10mA, supporting bidirectional protection in mixed-signal systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.225V nominal; ±0.2% tolerance at +25°C (±2.4mV), guaranteed over −40°C to +125°C |
| Initial Accuracy | ±0.2% (LM4051B grade); enables high-resolution ADC/DAC reference without calibration |
| Tempco | 50ppm/°C max; contributes ≤±6.125mV drift over full temperature range |
| Shunt Current Range | 60µA to 15mA; supports micropower sensor nodes and higher-current analog front-ends |
| Output Noise | 28µVRMS (10Hz–10kHz); critical for low-noise precision measurement circuits |
| Dynamic Impedance | ≤1.5Ω at 1mA; ensures minimal voltage shift under load transients |
| Long-Term Stability | 120ppm after 1000h; supports 10+ year system reliability in industrial deployments |
Pinout & Package
LM4051BIM3-1.2-T uses the 3-pin SC70 surface-mount package (1.8mm × 1.8mm), 50% smaller than SOT23-3. Pin 3 is NC (no connection) and must be left floating or tied to Pin 2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (+) | Anode / Positive Terminal | Connected to system ground or low-impedance return path; reverse-biased during normal operation |
| 2 (−) | Cathode / Negative Terminal | Reference output node; sinks shunt current to maintain 1.225V across external load |
| 3 (N.C.) | No Connection | Must remain unconnected or shorted to Pin 2; not internally bonded |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small SC70-3 footprint | 1.8mm × 1.8mm area saves PCB space in wearables and compact IoT sensors |
| No output capacitor required | Eliminates BOM cost and layout risk while ensuring stability with any capacitive load |
| Low 28µVRMS noise | Enables 16-bit+ resolution in precision data acquisition without external filtering |
| Wide 60µA–15mA operating range | Supports both ultra-low-power sleep modes and active high-speed conversion cycles |
| Guaranteed −40°C to +125°C operation | Validated for automotive under-hood, industrial PLC, and outdoor environmental monitoring |
Applications
| Portable Medical Sensors | Battery-Powered Data Loggers |
|---|---|
Use Scenario: Continuous glucose monitor using 16-bit sigma-delta ADC with 3.3V rail. IC Role / Device Role / Timing Role: Provides stable 1.225V reference for ADC VREF input, enabling accurate analog-to-digital conversion of electrochemical sensor signals. Use Value: ±0.2% initial accuracy and 50ppm/°C tempco ensure <±0.5% total error over temperature, meeting ISO 15197 clinical accuracy requirements. | Use Scenario: Remote soil moisture sensor node powered by Li-SOCl₂ battery with 10-year lifespan. IC Role / Device Role / Timing Role: Supplies reference voltage to low-power SAR ADC during brief wake-up bursts. Use Value: 60µA minimum operating current allows reference activation only when sampling, minimizing quiescent power drain. |
| Industrial Process Transmitters | Automotive Cabin Air Quality Modules |
Use Scenario: 4–20mA loop-powered pressure transmitter operating in factory environments. IC Role / Device Role / Timing Role: Precision shunt reference for DAC output stage and sensor excitation circuitry. Use Value: 120ppm long-term stability ensures calibration validity over 5+ years without field recalibration. | Use Scenario: CO₂ and VOC sensor module inside vehicle HVAC control unit. IC Role / Device Role / Timing Role: Reference source for analog front-end conditioning of NDIR sensor outputs. Use Value: Guaranteed operation from −40°C to +125°C supports placement near engine bay heat sources and cold-start reliability. |
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 | Adjustable (2.5V min), 0.5% initial accuracy, 100ppm/°C tempco, SOT23-3 | Requires external resistors to set 1.225V; less accurate and noisier (60µVRMS) | Select if adjustable output or cost sensitivity outweighs precision and noise requirements |
| ADR3412ARJZ-R7 | Fixed 1.2V, 0.1% initial accuracy, 30ppm/°C tempco, SC70-4 (pin 4 = NC) | Higher accuracy and lower tempco but different pinout (4-pin SC70); requires layout change | Select for tighter tolerance needs where board redesign is acceptable |
Compared with TLVH431ACDBVR and ADR3412ARJZ-R7, the LM4051BIM3-1.2-T offers optimal balance of SC70-3 compatibility, 1.225V exact output, 0.2% accuracy, and 28µVRMS noise - making it preferred for space-constrained, battery-operated precision analog systems requiring drop-in 1.225V reference capability.
Availability
LM4051BIM3-1.2-T is available at Aetrix Electronics and suitable for portable medical sensors, battery-powered data loggers, and industrial process transmitters requiring stable component supply with guaranteed long-term availability and RoHS-compliant packaging.
Supply support for LM4051BIM3-1.2-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 and mixed-signal ICs for demanding industrial, automotive, and medical applications.
The LM4050/LM4051 product line delivers micropower shunt references optimized for space-constrained, wide-temperature, high-accuracy systems - specifically targeting portable instrumentation, sensor signal conditioning, and battery-operated measurement equipment.
FAQ
What is the exact output voltage tolerance of the LM4051BIM3-1.2-T at +25°C?
The LM4051BIM3-1.2-T has a nominal output voltage of 1.225V with ±0.2% initial accuracy at +25°C, corresponding to ±2.4mV absolute tolerance (1.2226V to 1.2275V). This is specified for the "B" grade variant and confirmed in the Electrical Characteristics table for the 1.225V version under TA = +25°C conditions.
Does the LM4051BIM3-1.2-T require an external output capacitor for stability?
No, the LM4051BIM3-1.2-T does not require an external output capacitor. Its internal design ensures stability with any capacitive load, including zero capacitance. This eliminates BOM cost, reduces PCB area, and avoids potential phase-margin issues associated with capacitor selection - a key advantage over many competing shunt references.
What is the minimum operating current for the LM4051BIM3-1.2-T, and why is it important?
The LM4051BIM3-1.2-T requires a minimum shunt current of 60µA to maintain regulation. Below this threshold, the reference voltage deviates from specification. This value is critical for ultra-low-power designs - for example, in sleep-mode sensor nodes - where the series resistor must be sized to guarantee ≥60µA even at lowest supply voltage and maximum load current.
Can the LM4051BIM3-1.2-T be used in automotive under-hood applications?
Yes, the LM4051BIM3-1.2-T is rated for operation from −40°C to +125°C and is qualified for industrial and automotive ambient environments. Its guaranteed performance across this full range, combined with 120ppm long-term stability, makes it suitable for cabin air quality modules and other non-safety-critical automotive subsystems located near heat sources.
What is the function of Pin 3 on the LM4051BIM3-1.2-T, and how should it be handled?
Pin 3 of the LM4051BIM3-1.2-T is labeled N.C. (No Connection) and is not internally bonded. Per the datasheet, it must be left floating or connected to Pin 2 (cathode). Incorrect connection - such as tying it to supply or ground - may cause unpredictable behavior or damage. This pin serves no electrical function and exists solely for mechanical symmetry in the SC70-3 package.
LM4051BIM3-1.2-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Reference Type:
- Shunt
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 1.225V
- Voltage - Output (Max):
- -
- Current - Output:
- -
- Tolerance:
- ±0.2%
- Temperature Coefficient:
- 50ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- -
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
LM4051BIM3-1.2-T FAQ
1.How can I place an order for LM4051BIM3-1.2-T through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4051BIM3-1.2-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 LM4051BIM3-1.2-T reliable?
The price and inventory of LM4051BIM3-1.2-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4051BIM3-1.2-T is usually 5 days.
3.What payment methods are accepted for LM4051BIM3-1.2-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4051BIM3-1.2-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4051BIM3-1.2-T?
LM4051BIM3-1.2-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4051BIM3-1.2-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 LM4051BIM3-1.2-T?
For technical support, including LM4051BIM3-1.2-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4051BIM3-1.2-T requirements.
6.How does Aetrix verify that LM4051BIM3-1.2-T is sourced from the original manufacturer or authorized distributors?
All LM4051BIM3-1.2-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 LM4051BIM3-1.2-T meets industry standards.
7.What is the process for return or replacement of LM4051BIM3-1.2-T?
All LM4051BIM3-1.2-T units undergo pre-shipment inspection (PSI). If there is an issue with LM4051BIM3-1.2-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 LM4051BIM3-1.2-T part is unused and in its original packaging.
Return procedure for LM4051BIM3-1.2-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4051BIM3-1.2-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…
