My Inquiry
My Account
Texas Instruments LM4051CIM3-1.2
- Part No.:
- LM4051CIM3-1.2
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4051CIM3-1.2.pdf
- Description:
- IC VREF SHUNT 0.5% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,370
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM4051CIM3-1.2 from Texas Instruments is a precision micropower shunt voltage reference in SOT-23-3 package, delivering a fixed 1.225 V reverse breakdown voltage with ±6 mV (±0.49%) initial tolerance at 25°C, 50 ppm/°C max temperature coefficient, and 20 μVrms wideband noise (10 Hz–10 kHz). It operates from 60 μA to 12 mA supply current and supports industrial (−40°C to +85°C) and extended (−40°C to +125°C) temperature ranges - ideal for battery-powered instrumentation and portable data acquisition systems.
For engineers reviewing the LM4051CIM3-1.2 datasheet, LM4051CIM3-1.2 pinout, LM4051CIM3-1.2 application, or LM4051CIM3-1.2 equivalent, this page delivers verified specifications, validated pin functions, real-world use cases in precision analog signal chains, and two confirmed alternative parts with documented technical and application differences.
Technical Context
The LM4051CIM3-1.2 implements a curvature-corrected bandgap shunt reference architecture, operating as a two-terminal device where cathode regulates voltage by sinking variable current to maintain 1.225 V across its terminals. Its internal fuse and zener-zap trimming ensures ±6 mV initial accuracy (C-grade) at 25°C, with guaranteed 50 ppm/°C tempco over −40°C to +125°C.
No external capacitor is required for stability, and it tolerates capacitive loads up to 10 nF. The device draws only 60 μA minimum operating current and maintains regulation up to 12 mA, enabling ultra-low-power operation in space-constrained applications such as handheld medical sensors and wireless sensor nodes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.225 V reverse breakdown voltage - sets precise reference point for ADCs, DACs, and comparators without external feedback. |
| Initial Tolerance | ±6 mV (±0.49%) at 25°C (C-grade) - enables direct use in 12-bit systems without calibration. |
| Tempco | ≤50 ppm/°C over −40°C to +125°C - limits drift to ±6.5 mV across full extended range, critical for automotive and industrial environments. |
| Operating Current | 60 μA to 12 mA - supports microamp-level standby modes and milliamp-level active regulation in mixed-signal systems. |
| Output Noise | 20 μVrms (10 Hz–10 kHz) - low enough for 16-bit SAR ADC reference without additional filtering. |
| Dynamic Impedance | 0.5 Ω at 1 mA, 120 Hz - ensures minimal load-induced voltage shift during transient current demands. |
| Long-Term Stability | 120 ppm over 1000 hrs - guarantees reference integrity in deployed equipment with infrequent recalibration. |
Pinout & Package
SOT-23-3 (DBZ) package, 3.00 mm × 1.30 mm body size, surface-mount compatible with standard reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 2) | Reference ground node | Connected to system ground; serves as common return path for shunt current and defines cathode-to-anode voltage. |
| Cathode (Pin 1) | Voltage output terminal | Delivers regulated 1.225 V relative to anode; sinks all excess current from series resistor to maintain voltage. |
| NC / Float (Pin 3) | No-connect terminal | Must be left floating or tied to Pin 2 (anode); not internally connected - avoids parasitic leakage paths in PCB layout. |
Key Features
| Feature | Design Value |
|---|---|
| No output capacitor required | Stable operation with zero external capacitance - eliminates BOM cost, board area, and capacitor aging effects. |
| Tolerates capacitive loads | Remains stable with up to 10 nF on cathode - allows direct buffering with op-amps or driving of ADC input caps without oscillation. |
| Sub-miniature SOT-23 package | 3.00 mm × 1.30 mm footprint - fits high-density layouts in wearables, implantables, and compact IoT edge nodes. |
| Low quiescent current | 60 μA minimum operating current - extends battery life in coin-cell-powered devices beyond 5 years. |
| Reverse breakdown voltage option | Fixed 1.225 V output - simplifies design vs adjustable versions; eliminates resistor matching errors and thermal drift in feedback network. |
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: Shunt voltage reference for precision ADC and analog front-end biasing. Use Value: 20 μVrms noise and 50 ppm/°C tempco ensure ≤0.5 LSB error over temperature, meeting IEC 60601-2-27 clinical accuracy requirements. |
Use Scenario: Ruggedized environmental monitor logging temperature, humidity, and gas concentration in factory settings. IC Role / Device Role / Timing Role: Reference source for multi-channel SAR ADC and sensor excitation circuitry. Use Value: 60 μA min operating current enables >3-year operation on AA batteries; −40°C to +85°C rating ensures reliability in uncontrolled enclosures. |
| Wireless Sensor Nodes | Precision Battery Chargers |
Use Scenario: LoRaWAN node measuring soil moisture and pH using low-power analog sensing. IC Role / Device Role / Timing Role: Stable reference for ratiometric sensor measurements and ADC conversion. Use Value: Fixed 1.225 V output eliminates need for external resistors, reducing component count and layout sensitivity to trace parasitics. |
Use Scenario: USB-C PD charger IC monitoring cell voltage with ±10 mV accuracy across 0–4.5 V range. IC Role / Device Role / Timing Role: Precision reference for voltage sense amplifier and state-of-charge calculation. Use Value: ±6 mV initial tolerance and 120 ppm long-term stability prevent false overvoltage trips and extend battery cycle life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431CDBZR | 2.495 V fixed output, 2% initial tolerance, 50 ppm/°C tempco, requires ≥1 mA cathode current. | Higher voltage and looser tolerance limit use in sub-2 V systems; unsuitable for 12-bit+ precision below 2 V. | Select TL431CDBZR only when 2.5 V reference is acceptable and higher quiescent current is tolerable. |
| MAX6008AEUR+T | 1.25 V output, ±0.2% (A-grade) initial tolerance, 20 ppm/°C tempco, 35 μA min current, SC70-3 package. | Superior accuracy and lower tempco, but SC70-3 has higher thermal resistance (θJA = 280°C/W) vs SOT-23 (214.7°C/W). | Choose MAX6008AEUR+T for highest precision in thermally benign environments; LM4051CIM3-1.2 preferred for thermal robustness in compact enclosures. |
Compared with TL431CDBZR and MAX6008AEUR+T, the LM4051CIM3-1.2 uniquely balances 1.225 V output, C-grade ±6 mV tolerance, SOT-23 thermal performance, and micropower operation - making it optimal for space- and power-constrained 12-bit measurement systems where 1.2 V–1.25 V references are mandated.
Availability
LM4051CIM3-1.2 is available at Aetrix Electronics and suitable for portable medical sensors, industrial data loggers, and wireless sensor nodes requiring stable component supply with consistent parametric performance across production batches.
Supply support for LM4051CIM3-1.2 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
Texas Instruments is a global semiconductor company headquartered in Dallas, Texas, designing and manufacturing analog and embedded processing chips for industrial, automotive, and consumer applications.
The LM4051-N series was developed specifically for space-constrained, battery-operated precision analog systems - delivering micropower shunt reference performance in sub-miniature SOT-23 packaging with no external capacitor requirement.
FAQ
What is the exact output voltage and tolerance of the LM4051CIM3-1.2?
The LM4051CIM3-1.2 provides a fixed reverse breakdown voltage of 1.225 V with ±6 mV (±0.49%) initial tolerance at 25°C, per the C-grade specification in Section 6.5 of the SNOS491D datasheet. This tolerance is production-tested and guaranteed across the industrial temperature range (−40°C to +85°C) with an overtemperature limit of ±10.1 mV.
Does the LM4051CIM3-1.2 require an external capacitor for stability?
No, the LM4051CIM3-1.2 does not require an external capacitor for stability. Its advanced curvature-corrected bandgap design ensures inherent stability with zero external capacitance, and it remains stable even with up to 10 nF of capacitive load on the cathode - a key advantage over legacy shunt references like the TL431.
What are the minimum and maximum operating currents for the LM4051CIM3-1.2?
The LM4051CIM3-1.2 operates from 60 μA to 12 mA. The 60 μA minimum current is specified over the industrial temperature range (−40°C to +85°C), while the absolute maximum cathode current is 12 mA - exceeding this risks permanent damage per Absolute Maximum Ratings in Section 6.1.
How is Pin 3 used on the LM4051CIM3-1.2 in SOT-23 package?
Pin 3 of the LM4051CIM3-1.2 is a no-connect (NC) terminal and must be left floating or connected to Pin 2 (Anode). It is not internally bonded and serves no electrical function - tying it to ground or cathode would introduce unintended leakage paths and degrade reference accuracy.
What is the temperature coefficient and long-term stability of the LM4051CIM3-1.2?
The LM4051CIM3-1.2 has a guaranteed maximum temperature coefficient of 50 ppm/°C over −40°C to +125°C, and long-term stability of 120 ppm over 1000 hours at 25°C. These values are measured per JEDEC JESD22-A117 and documented in Sections 6.5 and 6.6 of the official TI datasheet.
LM4051CIM3-1.2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Reference Type:
- Shunt
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 1.225V
- Voltage - Output (Max):
- -
- Current - Output:
- 12 mA
- Tolerance:
- ±0.5%
- Temperature Coefficient:
- 50ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 20µVrms
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 65 µA
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
LM4051CIM3-1.2 FAQ
1.How can I place an order for LM4051CIM3-1.2 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4051CIM3-1.2 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 LM4051CIM3-1.2 reliable?
The price and inventory of LM4051CIM3-1.2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4051CIM3-1.2 is usually 5 days.
3.What payment methods are accepted for LM4051CIM3-1.2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4051CIM3-1.2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4051CIM3-1.2?
LM4051CIM3-1.2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4051CIM3-1.2 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 LM4051CIM3-1.2?
For technical support, including LM4051CIM3-1.2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4051CIM3-1.2 requirements.
6.How does Aetrix verify that LM4051CIM3-1.2 is sourced from the original manufacturer or authorized distributors?
All LM4051CIM3-1.2 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 LM4051CIM3-1.2 meets industry standards.
7.What is the process for return or replacement of LM4051CIM3-1.2?
All LM4051CIM3-1.2 units undergo pre-shipment inspection (PSI). If there is an issue with LM4051CIM3-1.2, 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 LM4051CIM3-1.2 part is unused and in its original packaging.
Return procedure for LM4051CIM3-1.2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4051CIM3-1.2 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…
