My Inquiry
My Account
Texas Instruments LM4051AEM3X-ADJ/NOPB
- Part No.:
- LM4051AEM3X-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4051AEM3X-ADJ/NOPB.pdf
- Description:
- IC VREF SHUNT ADJ 0.1% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,239
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM4051AEM3X-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% initial tolerance (A-grade), 20 μVrms 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 LM4051AEM3X-ADJ/NOPB datasheet, LM4051AEM3X-ADJ/NOPB pinout, LM4051AEM3X-ADJ/NOPB application, or LM4051AEM3X-ADJ/NOPB equivalent, key selection criteria include its adjustable output range, ultra-low quiescent current, capacitor-free stability, and guaranteed tempco over extended industrial temperature range.
Technical Context
The LM4051AEM3X-ADJ/NOPB functions as a curvature-corrected bandgap shunt reference with internal amplifier feedback, regulating by dynamically shunting excess current to ground. Its adjustable output is set via external resistor divider between cathode and anode, with feedback applied to the reference pin (Pin 3).
It requires no output capacitor for stability and tolerates arbitrary capacitive loads - enabled by internal compensation and low dynamic output impedance (0.3 Ω at 120 Hz, VOUT = VREF). The device maintains regulation down to 60 μA minimum operating current and supports up to 12 mA cathode current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage Range | 1.24 V to 10 V - programmable via external R1/R2 divider; enables flexible system-level voltage scaling |
| Initial Tolerance (25°C, A-grade) | ±0.1% - ensures high-accuracy ADC/DAC biasing without post-calibration |
| Tempco (−40°C to +125°C) | 50 ppm/°C max - guarantees ≤±5.2 mV total drift over full extended temperature range |
| Output Noise (10 Hz–10 kHz) | 20 μVrms - supports precision measurement circuits requiring low-noise references |
| Operating Current Range | 60 μA to 12 mA - enables ultra-low-power operation while sustaining robust load regulation |
| Dynamic Output Impedance | 0.3 Ω at 120 Hz (VOUT = VREF) - minimizes load-induced voltage droop in dynamic current-sink applications |
| Feedback Current | 70–130 nA - enables high-impedance resistor networks without significant error contribution |
Pinout & Package
SOT-23-3 package (3.00 mm × 1.30 mm), surface-mount, JEDEC MO-178AA compliant. Pin 1: Cathode; Pin 2: Anode; Pin 3: Reference (FB) - internally connected to die substrate for adjustable configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Pin 1) | Shunt current output / regulated voltage node | Primary output terminal; sinks current to maintain VOUT; connects to RS and load |
| Anode (Pin 2) | Current return path / ground reference | Common return for shunt current; typically tied to system ground or negative rail |
| Reference (Pin 3) | Feedback input / voltage sense node | Connects to mid-point of R1/R2 divider; sets VOUT = VREF × (1 + R1/R2); must not be left floating |
Key Features
| Feature | Design Value |
|---|---|
| No output capacitor required | Eliminates BOM cost and board area for stabilization; simplifies layout in size-constrained designs |
| Tolerates capacitive loads | Enables direct connection to ADC input caps or LDO bypasses without oscillation risk |
| Adjustable 1.24 V–10 V output | Supports diverse system rails (e.g., 2.5 V, 3.3 V, 5 V) using only two external resistors |
| 60 μA minimum operating current | Extends battery life in portable equipment; compatible with nanoampere-level microcontroller sleep modes |
| 50 ppm/°C tempco (−40°C to +125°C) | Meets stringent accuracy requirements in automotive under-hood and industrial control environments |
Applications
| Portable Instrumentation | Data Acquisition Systems |
|---|---|
Use Scenario: Handheld multimeter with 16-bit SAR ADC requiring stable reference under varying battery voltage and temperature. IC Role / Device Role / Timing Role: Shunt voltage reference providing precise 2.5 V reference for ADC conversion and analog front-end calibration. Use Value: ±0.1% initial tolerance and 50 ppm/°C tempco ensure <0.01% full-scale error across −10°C to +50°C operating range. | Use Scenario: Industrial sensor node logging temperature, pressure, and humidity with simultaneous multi-channel sampling. IC Role / Device Role / Timing Role: Shared reference source for multiple 24-bit delta-sigma ADCs, minimizing inter-channel gain mismatch. Use Value: 20 μVrms wideband noise prevents degradation of effective resolution below 22 bits. |
| Energy Management | Medical Monitoring Devices |
Use Scenario: Smart battery gauge IC monitoring Li-ion cell voltage and coulomb counting in wearables. IC Role / Device Role / Timing Role: Precision reference for voltage measurement circuitry, enabling accurate state-of-charge estimation. Use Value: 60 μA min operating current allows continuous reference operation during deep-sleep MCU states without compromising accuracy. | Use Scenario: Portable ECG monitor requiring low-noise, stable reference for analog signal conditioning prior to digitization. IC Role / Device Role / Timing Role: Low-drift reference for op-amp gain-setting and ADC reference, critical for sub-microvolt signal fidelity. Use Value: Thermal hysteresis of 0.3 mV/V ensures repeatable baseline after thermal cycling between patient body and ambient storage conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431ACDBVR | Fixed 2.495 V output; 2% initial tolerance; higher 0.2 mA min cathode current; 22 Ω typical dynamic impedance | Not adjustable; unsuitable for sub-2.4 V or >5 V reference needs; higher power dissipation at low currents | Select when fixed 2.5 V reference suffices and cost sensitivity outweighs precision requirements |
| MAX6126AASA+ | Series reference (not shunt); 4.096 V fixed; ±0.02% initial accuracy; 3 ppm/°C tempco; requires output capacitor | Higher accuracy and lower drift, but incompatible topology - cannot replace shunt configuration without circuit redesign | Choose only for new designs where series topology is acceptable and ultra-high stability justifies added complexity and cost |
Compared with TL431ACDBVR and MAX6126AASA+, the LM4051AEM3X-ADJ/NOPB uniquely combines adjustability, micropower operation, capacitor-free stability, and A-grade precision in a 3-pin SOT-23 - making it optimal for retrofitting existing shunt regulator layouts or designing compact, battery-sensitive systems.
Availability
LM4051AEM3X-ADJ/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, data acquisition systems, and energy management applications requiring stable component supply, long-term parametric consistency, and extended temperature performance.
Supply support for LM4051AEM3X-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 industrial-grade components.
The LM4051-N product line delivers micropower shunt voltage references optimized for space-constrained, battery-operated, and high-accuracy measurement systems - emphasizing low drift, low noise, and simplified design-in.
FAQ
What is the output voltage range supported by the LM4051AEM3X-ADJ/NOPB?
The LM4051AEM3X-ADJ/NOPB supports an adjustable output voltage range from 1.24 V to 10 V, set by an external resistor divider connected between the cathode (Pin 1) and anode (Pin 2), with the midpoint feeding the reference pin (Pin 3). This range is confirmed in Section 6.6 of the official TI datasheet (SNOS491D) under "Output voltage" specifications for the LM4051-ADJ variant.
Does the LM4051AEM3X-ADJ/NOPB require an external output capacitor for stability?
No, the LM4051AEM3X-ADJ/NOPB does not require an external output capacitor for stability. Its internal compensation ensures stable operation with any capacitive load, including direct connection to ADC input capacitors or LDO bypass caps. This is explicitly stated in the "Features" section and verified in the "Detailed Description" (Section 8.3) of the TI datasheet.
What is the minimum operating current for the LM4051AEM3X-ADJ/NOPB at 25°C?
The minimum operating current for the LM4051AEM3X-ADJ/NOPB at 25°C is 60 μA, as specified in Section 6.6 ("LM4051-ADJ Electrical Characteristics") of the TI datasheet. This value applies to all grade variants (A/B/C) and is validated across the industrial temperature range (−40°C to +85°C).
How does the feedback pin (Pin 3) function in the LM4051AEM3X-ADJ/NOPB?
In the LM4051AEM3X-ADJ/NOPB, Pin 3 is the reference (FB) input that senses the divided output voltage. It must be connected to the midpoint of the external R1/R2 resistor network to close the feedback loop. Unlike the fixed 1.225 V version, this pin is active and essential - leaving it floating will prevent proper regulation. The internal amplifier compares this voltage to the 1.212 V bandgap reference to control cathode current.
What is the guaranteed temperature coefficient of the LM4051AEM3X-ADJ/NOPB over −40°C to +125°C?
The LM4051AEM3X-ADJ/NOPB has a guaranteed maximum temperature coefficient of 50 ppm/°C over the extended temperature range of −40°C to +125°C, as documented in Section 6.6 of the TI datasheet under "∆VREF/∆T". This applies to all grade variants and ensures predictable, bounded drift for high-reliability applications.
LM4051AEM3X-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:
- Obsolete
- Reference Type:
- Shunt
- Output Type:
- Adjustable
- Voltage - Output (Min/Fixed):
- 1.212V
- Voltage - Output (Max):
- 10 V
- Current - Output:
- 12 mA
- Tolerance:
- ±0.1%
- Temperature Coefficient:
- 50ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 20µVrms
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 70 µA
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
LM4051AEM3X-ADJ/NOPB FAQ
1.How can I place an order for LM4051AEM3X-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4051AEM3X-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 LM4051AEM3X-ADJ/NOPB reliable?
The price and inventory of LM4051AEM3X-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 LM4051AEM3X-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM4051AEM3X-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4051AEM3X-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4051AEM3X-ADJ/NOPB?
LM4051AEM3X-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4051AEM3X-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 LM4051AEM3X-ADJ/NOPB?
For technical support, including LM4051AEM3X-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4051AEM3X-ADJ/NOPB requirements.
6.How does Aetrix verify that LM4051AEM3X-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM4051AEM3X-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 LM4051AEM3X-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM4051AEM3X-ADJ/NOPB?
All LM4051AEM3X-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM4051AEM3X-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 LM4051AEM3X-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM4051AEM3X-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4051AEM3X-ADJ/NOPB 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…
