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Texas Instruments LM4051CEM3X-ADJ/NOPB
- Part No.:
- LM4051CEM3X-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4051CEM3X-ADJ/NOPB.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,068
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Product details
Overview
LM4051CEM3X-ADJ/NOPB from Texas Instruments is a precision micropower shunt voltage reference in SOT-23-3 package, delivering adjustable 1.24 V to 10 V output with ±0.1% (A-grade) initial tolerance at 25°C, 20 μVrms noise (10 Hz–10 kHz), and 50 ppm/°C max temperature coefficient across −40°C to +125°C. It serves as a stable reference in battery-powered data acquisition and portable instrumentation.
For engineers reviewing the LM4051CEM3X-ADJ/NOPB datasheet, LM4051CEM3X-ADJ/NOPB pinout, LM4051CEM3X-ADJ/NOPB application, or LM4051CEM3X-ADJ/NOPB equivalent, key selection criteria include its adjustable output range, ultra-low 60 μA minimum operating current, no-output-capacitor-required stability, reverse breakdown architecture, and SOT-23 footprint compatibility for space-constrained designs.
Technical Context
The LM4051CEM3X-ADJ/NOPB operates as a curvature-corrected bandgap shunt reference, using internal amplifier feedback between cathode and reference pins to regulate output voltage via current shunting. Its adjustable configuration requires external R1/R2 resistive divider to set VOUT = VREF × (1 + R1/R2), where VREF = 1.212 V (typ) at 100 μA.
It functions in closed-loop mode only, with feedback current limited to 70–130 nA and dynamic output impedance of 0.3 Ω at 120 Hz (VOUT = VREF). Thermal hysteresis is specified at 0.3 mV/V over −40°C to +125°C cycling, and long-term stability is 120 ppm after 1000 hours.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage Range | 1.24 V to 10 V - programmable via external resistor divider; enables flexible system-level voltage scaling |
| Initial Tolerance (A Grade) | ±0.1% at 25°C - ensures high-accuracy ADC/DAC biasing without calibration |
| Tempco (Max) | 50 ppm/°C (−40°C to +125°C) - maintains <±0.525% total drift over industrial range |
| Operating Current Range | 60 μA to 12 mA - supports ultra-low-power sensor nodes and high-current clamp circuits |
| Output Noise | 20 μVrms (10 Hz–10 kHz) - suitable for 16-bit+ precision measurement front-ends |
| Dynamic Output Impedance | 0.3 Ω at 120 Hz (VOUT = VREF) - minimizes load-induced regulation error in dynamic conditions |
| Feedback Current | 70–130 nA - enables high-impedance resistor networks without significant divider loading |
Pinout & Package
SOT-23-3 package (3.00 mm × 1.30 mm), surface-mount, sub-miniature footprint optimized for PCB area-constrained applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 2) | Reference ground node | Common return path for feedback network and load; must be connected to system ground |
| Cathode (Pin 1) | Shunt current input / regulated output | Primary current sink point; output voltage appears between Cathode and Anode |
| Reference (Pin 3) | Feedback sense input | High-impedance input monitoring voltage divider midpoint; determines regulated VOUT via R1/R2 ratio |
Key Features
| Feature | Design Value |
|---|---|
| No output capacitor required | Stable operation with any capacitive load eliminates BOM cost and layout complexity |
| Adjustable 1.24–10 V output | Single part replaces multiple fixed references, reducing inventory and design iterations |
| 60 μA minimum operating current | Enables >10-year battery life in always-on IoT sensors and wearables |
| 50 ppm/°C tempco (guaranteed) | Ensures consistent performance across automotive under-hood and industrial ambient extremes |
| 20 μVrms wideband noise | Preserves signal integrity in high-resolution analog-to-digital conversion paths |
Applications
| Portable Medical Sensors | Industrial Data Loggers |
|---|---|
Use Scenario: Continuous glucose monitor with low-power ADC sampling at 100 SPS and 16-bit resolution. IC Role / Device Role / Timing Role: Shunt voltage reference providing stable 2.5 V bias for ADC reference input and op-amp signal conditioning. Use Value: 60 μA min current and 20 μVrms noise enable accurate sub-mV measurements while extending coin-cell battery life beyond 3 years. | Use Scenario: Remote environmental sensor node logging temperature, humidity, and pressure every 5 minutes. IC Role / Device Role / Timing Role: Adjustable reference set to 4.096 V for full-scale ADC range matching 12-bit SAR converter. Use Value: 1.24–10 V adjustability allows precise scaling to match sensor output ranges without custom trimming or additional components. |
| Battery-Powered Test Equipment | Automotive Cabin Control Modules |
Use Scenario: Handheld multimeter requiring stable 1.225 V and 5 V references for dual-range DC voltage measurement. IC Role / Device Role / Timing Role: Dual-reference source: one LM4051CEM3X-ADJ/NOPB configured for 1.225 V (R1=0), another for 5 V (R1/R2=3.1). Use Value: ±0.1% A-grade tolerance and 50 ppm/°C tempco ensure measurement accuracy remains within Class II specifications across 0–50°C ambient. | Use Scenario: HVAC control unit in vehicle cabin with microcontroller ADC monitoring thermistor and potentiometer inputs. IC Role / Device Role / Timing Role: Precision shunt reference generating 3.3 V for MCU ADC reference and analog front-end biasing. Use Value: Extended −40°C to +125°C operation and low thermal hysteresis (0.3 mV/V) prevent calibration drift during repeated hot/cold cycling in parked vehicles. |
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 | Fixed 2.495 V output; higher 1 mA min current; 22 Ω typical output impedance | Limited to 2.495 V systems; unsuitable for sub-2 V or >5 V references | Select when fixed 2.5 V reference suffices and higher current budget is acceptable |
| MAX6126AASA+ | Series topology; 3.0 V fixed output; 1.5 ppm/°C tempco; requires input capacitor | Higher accuracy but larger SO-8 package; not pin-compatible; needs external bypass cap | Choose for ultra-low-drift (<10 ppm total) applications where board space and supply headroom allow series architecture |
Compared with TL431CDBZR and MAX6126AASA+, the LM4051CEM3X-ADJ/NOPB uniquely combines adjustable output, SOT-23 footprint, micropower operation, and capacitor-free stability-making it optimal for compact, battery-sensitive systems requiring voltage flexibility without layout overhead.
Availability
LM4051CEM3X-ADJ/NOPB is available at Aetrix Electronics and suitable for portable medical sensors, industrial data loggers, battery-powered test equipment, and automotive cabin control modules requiring stable component supply with guaranteed long-term sourcing.
Supply support for LM4051CEM3X-ADJ/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 specializing in analog and embedded processing technologies, with leadership in precision analog ICs and power management solutions.
The LM4051-N product line delivers micropower shunt voltage references optimized for space-constrained, battery-operated systems demanding high initial accuracy, low noise, and wide temperature stability-targeting instrumentation, portable medical, and industrial sensing applications.
FAQ
What is the minimum operating current for LM4051CEM3X-ADJ/NOPB?
The LM4051CEM3X-ADJ/NOPB has a minimum operating current of 60 μA across the industrial temperature range (−40°C to +85°C) and 70 μA over the extended range (−40°C to +125°C). This ultra-low quiescent current enables multi-year operation from coin-cell batteries in always-on sensor nodes. The LM4051CEM3X-ADJ/NOPB must receive at least this current through its cathode pin to maintain regulation and specified accuracy.
How do I configure LM4051CEM3X-ADJ/NOPB for a specific output voltage?
To configure LM4051CEM3X-ADJ/NOPB, connect an external resistor divider (R1, R2) between cathode (Pin 1) and anode (Pin 2), with the midpoint tied to the reference pin (Pin 3). Output voltage follows VOUT = VREF × (1 + R1/R2), where VREF = 1.212 V (typ) at 100 μA. For example, R1 = 2.49 kΩ and R2 = 1.0 kΩ yields ~4.25 V. The LM4051CEM3X-ADJ/NOPB requires ≥60 μA cathode current to operate in regulation.
Does LM4051CEM3X-ADJ/NOPB require an output capacitor?
No, the LM4051CEM3X-ADJ/NOPB does not require an output capacitor for stability-it is designed to remain stable with any capacitive load, including direct connection to ADC reference inputs or op-amp buffers. While optional input bypassing (e.g., 0.1 μF ceramic) is recommended to suppress supply noise, omitting output capacitance reduces BOM count and simplifies layout. This behavior is intrinsic to the LM4051CEM3X-ADJ/NOPB's internal compensation.
What is the temperature coefficient specification for LM4051CEM3X-ADJ/NOPB?
The LM4051CEM3X-ADJ/NOPB has a maximum temperature coefficient of 50 ppm/°C over the full −40°C to +125°C range, guaranteed for all A/B/C grades. This means total output drift due to temperature is bounded by ±0.425% for A-grade devices over the industrial range (−40°C to +85°C), calculated as ±0.1% initial tolerance plus ±50 ppm/°C × 65°C. The LM4051CEM3X-ADJ/NOPB achieves this via curvature-corrected bandgap design and wafer-level zener-zap trimming.
Is LM4051CEM3X-ADJ/NOPB compatible with SOT-23-3 PCB footprints?
Yes, the LM4051CEM3X-ADJ/NOPB uses the standard DBZ (SOT-23-3) package with nominal body dimensions of 3.00 mm × 1.30 mm and defined pin pitch per JEDEC MO-178. Pin 1 (cathode) is at the top-left when the marking dot is oriented top-left, Pin 2 (anode) is bottom-center, and Pin 3 (reference) is top-right. This matches industry-standard SOT-23-3 land patterns, enabling drop-in replacement with other SOT-23-3 shunt references like TL431 variants-though electrical behavior differs.
LM4051CEM3X-ADJ/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:
- Discontinued at Digi-Key
- Reference Type:
- Shunt
- Output Type:
- Adjustable
- Voltage - Output (Min/Fixed):
- 1.212V
- Voltage - Output (Max):
- 10 V
- 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:
- 75 µA
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
LM4051CEM3X-ADJ/NOPB FAQ
1.How can I place an order for LM4051CEM3X-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4051CEM3X-ADJ/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 LM4051CEM3X-ADJ/NOPB reliable?
The price and inventory of LM4051CEM3X-ADJ/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4051CEM3X-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM4051CEM3X-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4051CEM3X-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4051CEM3X-ADJ/NOPB?
LM4051CEM3X-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4051CEM3X-ADJ/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 LM4051CEM3X-ADJ/NOPB?
For technical support, including LM4051CEM3X-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4051CEM3X-ADJ/NOPB requirements.
6.How does Aetrix verify that LM4051CEM3X-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM4051CEM3X-ADJ/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 LM4051CEM3X-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM4051CEM3X-ADJ/NOPB?
All LM4051CEM3X-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM4051CEM3X-ADJ/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 LM4051CEM3X-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM4051CEM3X-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4051CEM3X-ADJ/NOPB Tags
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