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Texas Instruments LM4121AIM5X-ADJ/NOPB
- Part No.:
- LM4121AIM5X-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM4121AIM5X-ADJ/NOPB.pdf
- Description:
- IC VREF SERIES ADJ 0.2% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,452
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Product details
Overview
LM4121AIM5X-ADJ/NOPB from Texas Instruments is a precision micropower adjustable voltage reference IC with 1.216 V nominal reference output, ±0.2% initial accuracy (Grade A), 50 ppm/°C temperature coefficient, and ±5 mA source/sink capability in SOT-23-5 package - used for high-accuracy biasing and regulation in portable instrumentation and battery-powered data acquisition systems.
For engineers reviewing the LM4121AIM5X-ADJ/NOPB datasheet, LM4121AIM5X-ADJ/NOPB pinout, LM4121AIM5X-ADJ/NOPB application, or LM4121AIM5X-ADJ/NOPB equivalent, key selection considerations include its 1.8 V minimum operating voltage, 160 µA typical supply current, enable-controlled power-down mode (<2 µA), low-noise 20 µVPP (0.1–10 Hz), and adjustable output configuration requiring external resistor feedback.
Technical Context
The LM4121AIM5X-ADJ/NOPB implements a bandgap-based reference core with internal trimming for high initial accuracy and low thermal drift. Its adjustable architecture uses the ADJ pin to set output via external resistive divider, with reference bias current (15–40 nA) flowing out of that pin - directly impacting output error per VOUT = VREF(1 + R1/R2) − IBIAS·R1.
It features an analog enable input with logic-compatible thresholds (VH = 1.5 V min, VL = 0.4 V max), enabling seamless integration into low-power microcontroller-controlled systems. The device remains stable with 0.022–0.047 µF ceramic output capacitors and supports load transients up to ±5 mA without oscillation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Output | Adjustable: VOUT = 1.216 V × (1 + R1/R2) − IBIAS·R1; enables precise user-defined voltage setting |
| Initial Accuracy | ±0.2% (Grade A); ensures ≤12.2 mV absolute error at 1.216 V nominal, critical for 12-bit+ ADC/DAC reference |
| Tempco | 50 ppm/°C over −40°C to +125°C; contributes ≤61 µV/°C drift in 1.216 V reference, supporting industrial-grade stability |
| Supply Current | 160 µA typical; allows >1-year operation on a 200 mAh coin cell in always-on sensor nodes |
| Power-Down Current | <2 µA at VEN ≤ 0.4 V; reduces standby consumption by 80× vs active mode |
| Min Input Voltage | 1.8 V at 5 mA load; supports direct regulation from single Li-ion or two alkaline cells |
| Noise (0.1–10 Hz) | 20 µVPP; limits RMS noise contribution to <7 µV in precision 16-bit SAR ADC 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 lead finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 - ADJ | Adjust Reference Node | Output voltage setting node; sinks 15–40 nA bias current - requires short trace and local ground to minimize error |
| Pin 2 - GND | Ground Reference | Analog ground return for reference core and enable circuitry; must be low-impedance single-point connection |
| Pin 3 - EN | Enable Control Input | Analog shutdown pin; <0.4 V disables output (IQ < 2 µA); ≥1.5 V enables (IQ = 160 µA typ) |
| Pin 4 - IN | Positive Supply Input | Input voltage rail (1.8–12 V); supplies reference core and output buffer; no external capacitor required |
| Pin 5 - OUT | Regulated Output | Adjustable reference output; sources/sinks ±5 mA; requires 0.022 µF ceramic capacitor for stability |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable Output Architecture | Enables user-defined reference voltages from ~1.22 V upward using two external resistors - avoids fixed-voltage inventory constraints |
| Micropower Operation | 160 µA typical supply current allows integration into energy-harvesting and ultra-low-power IoT sensor nodes |
| Enable-Controlled Power-Down | Reduces quiescent current to <2 µA, extending battery life in duty-cycled measurement systems |
| Low-Tempco Bandgap Core | 50 ppm/°C drift over −40°C to +125°C ensures stable reference across automotive under-hood and industrial environments |
| Ceramic Capacitor Stability | Stable with 0.022–0.047 µF X7R ceramics (ESR 0.1–0.5 Ω), eliminating need for costly tantalum or electrolytic capacitors |
Applications
| Portable Medical Sensors | Battery-Powered Data Loggers |
|---|---|
Use Scenario: Continuous glucose monitor with 16-bit ADC sampling analog electrochemical signal. IC Role / Device Role / Timing Role: Precision voltage reference for ADC full-scale calibration and sensor biasing. Use Value: ±0.2% initial accuracy and 50 ppm/°C tempco maintain ≤0.02% total reference error across body temperature range (32–42°C). |
Use Scenario: Remote environmental logger powered by AA batteries, recording temperature/humidity every 5 minutes. IC Role / Device Role / Timing Role: Low-power reference for analog front-end and microcontroller VREF input. Use Value: 160 µA supply current and <2 µA shutdown current extend battery life to >2 years in sleep-wake cycling. |
| Industrial Process Transmitters | Li-ion Battery Fuel Gauging |
Use Scenario: 4–20 mA loop-powered pressure transmitter operating in −40°C to +85°C ambient. IC Role / Device Role / Timing Role: Stable excitation reference for bridge sensor and precision DAC output scaling. Use Value: Guaranteed 50 ppm/°C tempco over extended range ensures ≤0.5% span error drift across full operating temperature. |
Use Scenario: Smart battery pack with integrated fuel gauge IC requiring accurate cell voltage monitoring. IC Role / Device Role / Timing Role: Adjustable reference set to 1.25 V for ADC input scaling of 0–4.2 V cell voltage range. Use Value: ADJ pin bias current compensation enables ≤0.1% full-scale error in voltage measurement despite resistor tolerance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision adjustable voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6126AASA+T | Fixed 1.25 V only; 0.04% initial accuracy; 3 ppm/°C tempco; higher cost; requires external op-amp for adjustment | Not adjustable - unsuitable where variable reference voltage is required | Select only if ultra-low tempco and fixed 1.25 V suffice and board space permits op-amp solution |
| ADR3412ARJZ-R7 | Fixed 1.2 V output; 0.1% initial accuracy; 10 ppm/°C tempco; 125 µA supply current; no enable pin | Lacks adjustability and power-down control - cannot replace LM4121AIM5X-ADJ/NOPB in dynamic-range or low-power designs | Consider only for static 1.2 V reference needs where lowest possible drift is prioritized over flexibility |
Compared with MAX6126AASA+T and ADR3412ARJZ-R7, the LM4121AIM5X-ADJ/NOPB uniquely delivers factory-trimmed adjustability, integrated enable, and micropower operation in one SOT-23-5 package - making it the only choice when system-level requirements include programmable reference voltage, battery-aware shutdown, and minimal footprint.
Availability
LM4121AIM5X-ADJ/NOPB is available at Aetrix Electronics and suitable for portable medical sensors, battery-powered data loggers, industrial process transmitters, and Li-ion battery fuel gauging requiring stable component supply across multi-year production cycles.
Supply support for LM4121AIM5X-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 digital signal technologies, with decades of leadership in precision reference design.
The LM4121 series was developed specifically for micropower, low-voltage, and enable-controlled precision reference applications in portable and industrial systems - emphasizing accuracy, stability, and minimal quiescent current.
FAQ
What is the output voltage range supported by LM4121AIM5X-ADJ/NOPB?
The LM4121AIM5X-ADJ/NOPB is an adjustable reference with nominal VREF = 1.216 V. Using external resistors per VOUT = VREF(1 + R1/R2) − IBIAS·R1, outputs from ~1.22 V upward are achievable. The device maintains specified accuracy and stability only within its 1.8–12 V input range and ±5 mA load capability. LM4121AIM5X-ADJ/NOPB does not support sub-1.2 V outputs.
How does the ADJ pin bias current affect LM4121AIM5X-ADJ/NOPB accuracy?
The ADJ pin draws 15–40 nA (typical 25 nA) bias current outward, introducing a voltage error proportional to R1. For example, with R1 = 100 kΩ, this adds up to 1 mV error - which must be subtracted in the output equation. LM4121AIM5X-ADJ/NOPB datasheet specifies this term explicitly to enable first-order error correction in high-accuracy designs.
Can LM4121AIM5X-ADJ/NOPB operate from a single 1.5 V alkaline cell?
No. LM4121AIM5X-ADJ/NOPB requires a minimum input voltage of 1.8 V at 5 mA load (1.5 V typical at no load). A single 1.5 V alkaline cell falls below this threshold under load and cannot reliably power LM4121AIM5X-ADJ/NOPB. Two alkaline cells (3.0 V fresh) or a single Li-ion cell (3.0–4.2 V) are appropriate supply sources for LM4121AIM5X-ADJ/NOPB.
What output capacitor is required for stable operation of LM4121AIM5X-ADJ/NOPB?
LM4121AIM5X-ADJ/NOPB requires a minimum 0.022 µF ceramic capacitor (X7R, C0G) between OUT and GND for stability. Values up to 0.047 µF are fully supported. Larger values (up to 1 µF) require tantalum construction and an additional 50 pF capacitor from ADJ to OUT - per TI Application Hints. Using undersized or wrong-dielectric capacitors risks oscillation in LM4121AIM5X-ADJ/NOPB circuits.
Is LM4121AIM5X-ADJ/NOPB pin-compatible with LM4121IM5X-ADJ/NOPB?
Yes. Both LM4121AIM5X-ADJ/NOPB and LM4121IM5X-ADJ/NOPB use identical SOT-23-5 (DBV) packaging, pinout, and electrical interface. The sole difference is grade: LM4121AIM5X-ADJ/NOPB is Grade A (±0.2% initial accuracy), while LM4121IM5X-ADJ/NOPB is Standard grade (±0.5%). PCB layout and schematic for LM4121AIM5X-ADJ/NOPB apply directly to LM4121IM5X-ADJ/NOPB.
LM4121AIM5X-ADJ/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- SC-74A, SOT-753
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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
LM4121AIM5X-ADJ/NOPB FAQ
1.How can I place an order for LM4121AIM5X-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4121AIM5X-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 LM4121AIM5X-ADJ/NOPB reliable?
The price and inventory of LM4121AIM5X-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 LM4121AIM5X-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM4121AIM5X-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4121AIM5X-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4121AIM5X-ADJ/NOPB?
LM4121AIM5X-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4121AIM5X-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 LM4121AIM5X-ADJ/NOPB?
For technical support, including LM4121AIM5X-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4121AIM5X-ADJ/NOPB requirements.
6.How does Aetrix verify that LM4121AIM5X-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM4121AIM5X-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 LM4121AIM5X-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM4121AIM5X-ADJ/NOPB?
All LM4121AIM5X-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM4121AIM5X-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 LM4121AIM5X-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM4121AIM5X-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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