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Texas Instruments LM4121AIM5-ADJ/NOPB
- Part No.:
- LM4121AIM5-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM4121AIM5-ADJ/NOPB.pdf
- Description:
- IC VREF SERIES ADJ 0.2% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,054
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Product details
Overview
LM4121AIM5-ADJ/NOPB from Texas Instruments is a precision micropower adjustable voltage reference IC in SOT-23-5 package, delivering 1.216 V nominal output with ±0.2% initial accuracy (Grade A), 50 ppm/°C temperature coefficient, ±5 mA source/sink capability, and 160 µA typical supply current - used for high-accuracy biasing and regulation in portable instrumentation and battery-powered data acquisition systems.
For engineers reviewing the LM4121AIM5-ADJ/NOPB datasheet, LM4121AIM5-ADJ/NOPB pinout, LM4121AIM5-ADJ/NOPB application, or LM4121AIM5-ADJ/NOPB equivalent, key selection considerations include its adjustable output architecture, enable-controlled power-down mode (<2 µA), low dropout operation down to 1.8 V input, and compatibility with ceramic output capacitors as small as 0.022 µF.
Technical Context
The LM4121AIM5-ADJ/NOPB implements a bandgap-based reference core with an external feedback network via the ADJ pin, enabling programmable output voltages per VOUT = VREF(1 + R1/R2) − IBIAS·R1. Its internal enable circuitry provides analog-level shutdown control with logic-compatible thresholds (VH = 1.5 V, VL = 0.4 V) and <6 µA turn-on current.
It operates across −40°C to +85°C ambient, supports load currents from −5 mA to +5 mA, maintains stability with 0.022–0.047 µF ceramic capacitors (ESR ≤ 0.5 Ω), and exhibits 20 µVPP (0.1–10 Hz) and 30 µVRMS (10 Hz–10 kHz) output noise - all while consuming only 160 µA quiescent current in active mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Adjustable, 1.216 V nominal reference; set externally via resistor divider on ADJ pin |
| Initial Accuracy | ±0.2% (Grade A); ensures tight system calibration without post-manufacture trimming |
| Tempco | 50 ppm/°C over −40°C to +125°C junction range; enables stable performance in industrial environments |
| Supply Current | 160 µA typical; allows multi-year battery life in always-on sensor nodes |
| Power-down Current | <2 µA at VEN ≤ 0.4 V; reduces standby power by >98% vs active mode |
| Input Voltage Range | 1.8 V to 12 V; supports single-cell Li-ion (2.7–4.2 V) and 3.3 V/5 V rails without LDO pre-regulation |
| Output Drive | ±5 mA sink/source; directly drives ADC reference inputs, op-amp bias networks, or DAC references |
Pinout & Package
SOT-23-5 (DBV) package: 2.9 mm × 1.6 mm × 1.45 mm body, gull-wing leads, RoHS-compliant matte tin (Sn) finish, MSL Level-1 (260°C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - ADJ | Adjust Reference Input | Feedback node for external resistor divider; supplies 15–40 nA bias current outward |
| 2 - GND | Ground Reference | Primary return path for load, supply, and reference currents; requires low-impedance connection |
| 3 - EN | Enable Control | Analog input: ≥1.5 V enables output; ≤0.4 V disables output and reduces supply current to <2 µA |
| 4 - IN | Positive Supply Input | Accepts 1.8–12 V; powers internal bandgap and output stage; no input capacitor required |
| 5 - OUT | Reference Output | Regulated voltage source/sink node; connects to ADC REF+, DAC VREF, or precision op-amp circuits |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable Output Architecture | Enables precise VOUT setting from 1.216 V upward using two external resistors; accommodates diverse system voltage requirements |
| Ultra-Low Quiescent Current | 160 µA typical supply current allows integration into energy-harvesting and coin-cell-powered designs |
| Enable-Controlled Power-Down | Reduces current to <2 µA during sleep cycles - critical for duty-cycled sensors and wireless transceivers |
| Ceramic Capacitor Stability | Stable with 0.022–0.047 µF X7R ceramics (ESR ≤ 0.5 Ω); eliminates need for costly tantalum or electrolytic capacitors |
| Low Output Noise | 20 µVPP (0.1–10 Hz) and 30 µVRMS (10 Hz–10 kHz) support 16-bit+ ADC accuracy without additional filtering |
Applications
| Portable Medical Sensors | Precision Data Loggers |
|---|---|
Use Scenario: Continuous glucose monitor with onboard 16-bit SAR ADC sampling analog electrochemical signal. IC Role / Device Role / Timing Role: Provides stable, low-noise reference voltage for ADC conversion and sensor biasing circuitry. Use Value: ±0.2% initial accuracy and 50 ppm/°C tempco ensure measurement repeatability across body temperature variations (32–42°C) and multi-day operation. | Use Scenario: Battery-powered environmental logger recording temperature, humidity, and pressure every 10 seconds. IC Role / Device Role / Timing Role: Supplies regulated reference to multiple precision analog front-ends and microcontroller ADC channels. Use Value: 160 µA supply current extends CR2032 battery life beyond 2 years; enable pin synchronizes reference activation with sampling bursts. |
| Industrial Field Transmitters | Li-ion Battery Fuel Gauges |
Use Scenario: 4–20 mA loop-powered pressure transmitter operating in −40°C to +85°C ambient. IC Role / Device Role / Timing Role: Generates accurate excitation voltage for bridge sensors and reference for 24-bit ΣΔ ADC. Use Value: Guaranteed 50 ppm/°C tempco over full industrial range eliminates calibration drift; ±5 mA drive supports ratiometric sensor biasing. | Use Scenario: Smart battery pack with integrated fuel gauge IC requiring precise voltage threshold detection. IC Role / Device Role / Timing Role: Sets accurate under-voltage lockout (UVLO) and over-voltage protection (OVP) thresholds via comparator reference input. Use Value: Adjustable output allows exact 2.7 V and 4.3 V thresholds; low tempco prevents false trips across temperature extremes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6126AASA+T | Fixed 1.25 V output; 0.04% initial accuracy; 3 ppm/°C tempco; 1.8–5.5 V input; 35 µA supply current | Not adjustable; superior tempco and lower IQ, but lacks EN pin and output flexibility | Select when fixed 1.25 V suffices and ultra-low drift is prioritized over adjustability |
| ADR3412ARJZ-R7 | Fixed 1.2 V output; 0.1% initial accuracy; 30 ppm/°C tempco; 1.8–5.5 V input; 120 µA supply current; no enable pin | No power-down function; tighter initial tolerance than LM4121AIM5-ADJ/NOPB Grade A, but no adjustment or shutdown | Choose for space-constrained designs needing higher accuracy than ±0.2% and no enable control required |
Compared with MAX6126AASA+T and ADR3412ARJZ-R7, the LM4121AIM5-ADJ/NOPB uniquely combines adjustability, enable functionality, and micropower operation in a single SOT-23-5 package - making it optimal for systems requiring programmable reference voltage and dynamic power management.
Availability
LM4121AIM5-ADJ/NOPB is available at Aetrix Electronics and suitable for portable medical sensors, precision data loggers, industrial field transmitters, and Li-ion battery fuel gauges requiring stable component supply with guaranteed long-term continuity.
Supply support for LM4121AIM5-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 leader specializing in analog, embedded processing, and connectivity technologies, with decades of leadership in precision analog ICs and reference design expertise.
The LM4121 product line delivers micropower, low-dropout voltage references optimized for battery-operated instrumentation, portable test equipment, and industrial sensing - emphasizing accuracy, thermal stability, and minimal quiescent current.
FAQ
What is the minimum input voltage required for stable operation of the LM4121AIM5-ADJ/NOPB?
The LM4121AIM5-ADJ/NOPB operates stably with input voltages as low as 1.8 V at full 5 mA load, and down to 1.5 V under light loads. This low dropout capability enables direct use with single-cell Li-ion batteries (2.7–4.2 V) and 3.3 V rails without pre-regulation. The device maintains specified accuracy and tempco across this range when loaded within ±5 mA.
How does the ADJ pin function in the LM4121AIM5-ADJ/NOPB, and what is its bias current?
The ADJ pin on the LM4121AIM5-ADJ/NOPB serves as the feedback node for external resistor dividers that set the output voltage per VOUT = VREF(1 + R1/R2) − IBIAS·R1. It sources 15–40 nA (typical 25 nA) bias current, which must be accounted for in high-precision resistor selection. This current flows out of the pin and affects gain accuracy if R1 exceeds ~100 kΩ.
Can the LM4121AIM5-ADJ/NOPB drive a 10 µF tantalum capacitor on its output?
No - the LM4121AIM5-ADJ/NOPB is only guaranteed stable with 0.022–0.047 µF ceramic capacitors (ESR ≤ 0.5 Ω). Larger values like 10 µF tantalum violate stability criteria and may cause oscillation. For improved transient response, use up to 1 µF tantalum *with* a 50 pF capacitor between OUT and ADJ pins - but full validation across temperature, line, and load is mandatory.
What is the maximum load current the LM4121AIM5-ADJ/NOPB can source or sink while maintaining accuracy?
The LM4121AIM5-ADJ/NOPB guarantees ±0.2% initial accuracy and 50 ppm/°C tempco across −5 mA to +5 mA load current. Load regulation is specified as 0.04%/mA (1–5 mA range) and 0.12%/mA (−1 to 0 mA), meaning output deviation remains within ±0.2 mV at 5 mA load - sufficient for driving ADC references and op-amp bias networks without external buffering.
Is the LM4121AIM5-ADJ/NOPB compatible with lead-free reflow processes?
Yes - the LM4121AIM5-ADJ/NOPB has a matte tin (Sn) lead finish and is rated MSL Level-1 (260°C peak reflow, unlimited floor life), fully compliant with IPC/JEDEC J-STD-020D. It supports standard lead-free reflow profiles including ramp-to-spike and soak profiles, with peak temperatures up to 260°C for ≤60 seconds. The SOT-23-5 (DBV) package is qualified for industrial temperature operation (−40°C to +85°C).
LM4121AIM5-ADJ/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- SC-74A, SOT-753
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Reference Type:
- Series
- Output Type:
- Adjustable
- Voltage - Output (Min/Fixed):
- 1.216V
- Voltage - Output (Max):
- 12 V
- Current - Output:
- 5 mA
- Tolerance:
- ±0.2%
- Temperature Coefficient:
- 50ppm/°C
- Noise - 0.1Hz to 10Hz:
- 20µVp-p
- Noise - 10Hz to 10kHz:
- 30µVrms
- Voltage - Input:
- 1.5V ~ 12V
- Current - Supply:
- 275µA
- Current - Cathode:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
LM4121AIM5-ADJ/NOPB FAQ
1.How can I place an order for LM4121AIM5-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4121AIM5-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 LM4121AIM5-ADJ/NOPB reliable?
The price and inventory of LM4121AIM5-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 LM4121AIM5-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM4121AIM5-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4121AIM5-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4121AIM5-ADJ/NOPB?
LM4121AIM5-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4121AIM5-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 LM4121AIM5-ADJ/NOPB?
For technical support, including LM4121AIM5-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4121AIM5-ADJ/NOPB requirements.
6.How does Aetrix verify that LM4121AIM5-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM4121AIM5-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 LM4121AIM5-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM4121AIM5-ADJ/NOPB?
All LM4121AIM5-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM4121AIM5-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 LM4121AIM5-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM4121AIM5-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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