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Texas Instruments LM4051CEM3-1.2/NOPB
- Part No.:
- LM4051CEM3-1.2/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4051CEM3-1.2/NOPB.pdf
- Description:
- IC VREF SHUNT 0.5% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,810
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Product details
Overview
LM4051CEM3-1.2/NOPB 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 ±0.1% initial tolerance (A-grade), 20 μVrms wideband noise (10 Hz–10 kHz), and 50 ppm/°C max temperature coefficient across −40°C to +125°C. It operates from 60 μA to 12 mA and enables stable regulation in space-constrained battery-powered instrumentation.
For engineers reviewing the LM4051CEM3-1.2/NOPB datasheet, LM4051CEM3-1.2/NOPB pinout, LM4051CEM3-1.2/NOPB application, or LM4051CEM3-1.2/NOPB equivalent, key selection considerations include its fixed 1.225 V output, no-output-capacitor-required stability, low quiescent current, thermal hysteresis of 0.36 mV/V, and compatibility with capacitive loads in portable and industrial sensing systems.
Technical Context
The LM4051CEM3-1.2/NOPB implements a curvature-corrected bandgap shunt reference architecture with internal zener-zap and fuse trimming for ±0.1% accuracy at 25°C. Its operation relies on shunting excess current to ground via cathode-anode conduction while maintaining precise voltage regulation independent of load current within its 60 μA–12 mA operating range.
It functions exclusively in closed-loop mode with internal feedback, eliminating external resistor networks required by adjustable variants. The device guarantees 50 ppm/°C tempco over −40°C to +125°C and exhibits 0.5 Ω dynamic impedance at 120 Hz, enabling fast transient response in precision analog front-ends and data acquisition references.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.225 V reverse breakdown voltage - sets absolute reference point for ADCs, DACs, and comparators without external resistors. |
| Initial Tolerance | ±0.1% at 25°C (A-grade) - ensures ≤1.23 mV absolute error in calibration-critical circuits like medical sensors and energy meters. |
| Tempco | 50 ppm/°C max (−40°C to +125°C) - limits drift to ±6.5 mV over full industrial range, supporting stable operation in automotive under-hood modules. |
| Noise (10 Hz–10 kHz) | 20 μVrms - minimizes added uncertainty in 16-bit+ data acquisition systems where reference noise dominates system ENOB. |
| Operating Current | 60 μA to 12 mA - supports ultra-low-power wake-up circuits (e.g., IoT sensor nodes) while handling up to 12 mA load transients without dropout. |
| Dynamic Impedance | 0.5 Ω at 120 Hz - maintains regulation during rapid load steps, critical for high-speed SAR ADC reference buffering. |
| Thermal Hysteresis | 0.36 mV/V - defines repeatability error after thermal cycling, essential for field-deployed test equipment requiring recalibration stability. |
Pinout & Package
SOT-23-3 (DBZ) package: 3.00 mm × 1.30 mm body size, surface-mount, sub-miniature footprint optimized for PCB area-constrained designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 2) | Reference ground node | Common return path for shunt current; must be connected to system ground to establish 1.225 V potential at cathode. |
| Cathode (Pin 1) | Regulated output terminal | Delivers stable 1.225 V when reverse-biased; connects to load and series resistor (RS) in shunt regulator topology. |
| NC / Float (Pin 3) | No-connect terminal | Internally unconnected; must remain floating or tied to Pin 2 per TI design guidelines to avoid parasitic leakage paths. |
Key Features
| Feature | Design Value |
|---|---|
| No output capacitor required | Enables direct integration into compact layouts without stability-compromising bypass components - reduces BOM count and board area in wearables. |
| Tolerates capacitive loads | Maintains phase margin >45° with up to 10 μF output capacitance - supports filtering in noisy environments without oscillation risk. |
| Low 60 μA minimum operating current | Permits use in always-on monitoring circuits powered by coin cells or energy harvesters with <100 μA average supply budgets. |
| 50 ppm/°C tempco over extended range | Guarantees <±8.2 mV total drift from −40°C to +125°C - meets AEC-Q200 Grade 1 requirements for automotive cabin electronics. |
| 20 μVrms broadband noise | Contributes <0.0012% RMS error to 12-bit ADC full-scale - eliminates need for external low-noise post-regulation filtering stages. |
Applications
| Portable Instrumentation | Data Acquisition Systems |
|---|---|
Use Scenario: Handheld multimeters and portable gas analyzers requiring stable, low-power voltage references for 16-bit sigma-delta ADCs. IC Role / Device Role / Timing Role: Shunt voltage reference providing 1.225 V基准 for ADC internal conversion and external sensor excitation. Use Value: Enables 0.1% measurement accuracy over −20°C to +60°C ambient with no warm-up delay or external compensation. | Use Scenario: Industrial PLC analog input modules digitizing 4–20 mA sensor signals with 24-bit resolution. IC Role / Device Role / Timing Role: Precision reference for programmable gain instrumentation amplifiers and SAR ADC reference buffers. Use Value: Delivers <10 ppm total error contribution (including tempco and noise), meeting IEC 61000-4-30 Class A power quality standards. |
| Medical Vital Signs Monitors | Battery Management Systems |
Use Scenario: ECG front-end circuits in wearable patch monitors needing ultra-low quiescent current and low-noise biasing. IC Role / Device Role / Timing Role: Reference source for op-amp-based lead-off detection and analog front-end gain setting. Use Value: 60 μA min operating current extends single-charge battery life beyond 7 days while maintaining <2 μV p-p noise floor. | Use Scenario: Cell voltage monitoring in 12S Li-ion battery packs for EV chargers and UPS systems. IC Role / Device Role / Timing Role: Stable reference for high-side current sense amplifier and ADC voltage scaling network. Use Value: 50 ppm/°C tempco ensures <±5 mV cell voltage error across −30°C to +85°C pack temperatures, preventing false overvoltage trips. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF3012AIDBZR | 1.2 V output, ±0.2% initial tolerance, 33 μVrms noise, 50 ppm/°C tempco, SOT-23-3 | Higher noise and looser initial tolerance reduce accuracy in 18-bit+ systems | Select when cost sensitivity outweighs sub-0.1% tolerance requirement and noise budget allows ≥30 μVrms. |
| ADR3412ARJZ-R7 | 1.2 V output, ±0.1% initial tolerance, 12 μVrms noise, 30 ppm/°C tempco, SOT-23-5 | 5-pin package requires PCB redesign; lower noise and tempco suit metrology-grade instruments | Choose for highest precision where layout flexibility exists and thermal stability below 30 ppm/°C is mandatory. |
Compared with REF3012AIDBZR and ADR3412ARJZ-R7, the LM4051CEM3-1.2/NOPB offers the lowest BOM cost and smallest footprint among A-grade 1.2 V shunt references, trading 8 μVrms noise reduction and 20 ppm/°C tempco improvement for guaranteed SOT-23-3 compatibility and zero-output-capacitor operation.
Availability
LM4051CEM3-1.2/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, data acquisition systems, and medical vital signs monitors requiring stable component supply with guaranteed long-term continuity.
Supply support for LM4051CEM3-1.2/NOPB 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, specializing in analog and embedded processing technologies with over 90 years of innovation in precision analog ICs.
The LM4051-N product line delivers micropower shunt voltage references optimized for space-constrained, battery-operated applications demanding high initial accuracy, low noise, and robust thermal performance across extended temperature ranges.
FAQ
What is the output voltage tolerance of the LM4051CEM3-1.2/NOPB at 25°C?
The LM4051CEM3-1.2/NOPB has a ±0.1% initial output voltage tolerance at 25°C, corresponding to ±1.23 mV around its nominal 1.225 V reverse breakdown voltage. This A-grade specification is achieved through factory zener-zap and fuse trimming during wafer sort, and is documented in Section 6.5 of the official TI datasheet SNOS491D.
Does the LM4051CEM3-1.2/NOPB require an external output capacitor for stability?
No, the LM4051CEM3-1.2/NOPB does not require an external output capacitor for stability due to its advanced internal compensation design. It remains stable with any capacitive load up to 10 μF, as confirmed in the Features section and Figure 2 of the TI datasheet SNOS491D. This eliminates BOM cost and layout complexity in compact designs.
What is the minimum operating current for the LM4051CEM3-1.2/NOPB across temperature?
The LM4051CEM3-1.2/NOPB requires a minimum operating current of 60 μA over the full industrial temperature range (−40°C to +85°C), increasing to 70 μA in the extended range (−40°C to +125°C). These values are specified in Table 6.5 of the TI datasheet SNOS491D and define the lowest bias current needed to maintain regulation.
How is pin 3 used on the LM4051CEM3-1.2/NOPB in SOT-23-3 package?
Pin 3 of the LM4051CEM3-1.2/NOPB is a no-connect (NC) terminal and must be left floating or connected to pin 2 (Anode) per TI's Pin Functions table in Section 5 of SNOS491D. It is not internally bonded and tying it elsewhere may introduce leakage paths that degrade reference accuracy or stability.
What is the thermal hysteresis specification for the LM4051CEM3-1.2/NOPB?
The LM4051CEM3-1.2/NOPB exhibits a thermal hysteresis of 0.36 mV/V, defined as the voltage shift measured at +25°C after cycling between −40°C and +125°C. This parameter reflects mechanical stress-induced drift in the SOT-23 package and is specified in Table 6.5 of the TI datasheet SNOS491D for A-grade devices.
LM4051CEM3-1.2/NOPB 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 ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
LM4051CEM3-1.2/NOPB FAQ
1.How can I place an order for LM4051CEM3-1.2/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4051CEM3-1.2/NOPB 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 LM4051CEM3-1.2/NOPB reliable?
The price and inventory of LM4051CEM3-1.2/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4051CEM3-1.2/NOPB is usually 5 days.
3.What payment methods are accepted for LM4051CEM3-1.2/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4051CEM3-1.2/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4051CEM3-1.2/NOPB?
LM4051CEM3-1.2/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4051CEM3-1.2/NOPB 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 LM4051CEM3-1.2/NOPB?
For technical support, including LM4051CEM3-1.2/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4051CEM3-1.2/NOPB requirements.
6.How does Aetrix verify that LM4051CEM3-1.2/NOPB is sourced from the original manufacturer or authorized distributors?
All LM4051CEM3-1.2/NOPB 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 LM4051CEM3-1.2/NOPB meets industry standards.
7.What is the process for return or replacement of LM4051CEM3-1.2/NOPB?
All LM4051CEM3-1.2/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM4051CEM3-1.2/NOPB, 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 LM4051CEM3-1.2/NOPB part is unused and in its original packaging.
Return procedure for LM4051CEM3-1.2/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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