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Analog Devices Inc./Maxim Integrated LM4051BIX3-1.2+T
- Part No.:
- LM4051BIX3-1.2+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- SC-70, SOT-323
- Datasheet:
-
LM4051BIX3-1.2+T.pdf
- Description:
- LM4051 50PPM PER DEGREE CELSIUS
- Quantity:
- Payment:
- Shipping:
Inventory:19,645
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Product details
Overview
LM4051BIX3-1.2+T from Maxim Integrated is a precision 1.225V shunt voltage reference in SC70-3 package, featuring ±0.2% initial accuracy, 50ppm/°C max temperature coefficient, and 60µA to 15mA operating current range. It delivers stable reverse breakdown voltage for low-power analog signal conditioning in portable instrumentation and battery-powered sensor interfaces.
For engineers reviewing the LM4051BIX3-1.2+T datasheet, LM4051BIX3-1.2+T pinout, LM4051BIX3-1.2+T application, or LM4051BIX3-1.2+T equivalent, this page provides verified specifications, validated SC70-3 terminal mapping, real-world use cases in high-accuracy ADC/DAC biasing, and two confirmed alternative parts with documented performance trade-offs.
Technical Context
The LM4051BIX3-1.2+T operates as a two-terminal bandgap shunt reference, maintaining a fixed 1.225V output across its anode and cathode when reverse-biased between 60µA and 15mA. Its internal BiCMOS architecture enables low dynamic impedance (≤1.5Ω) and 28µVRMS wideband noise (10Hz–10kHz).
It requires no external stabilization capacitor and remains stable under any capacitive load. Guaranteed over −40°C to +125°C, it achieves ±15ppm/°C typical temperature coefficient and 120ppm long-term stability after 1000 hours.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.225V nominal; ±0.2% initial tolerance at +25°C ensures ≤2.45mV absolute error in precision 12-bit DAC references. |
| Tempco | 50ppm/°C max; limits drift to ±6.125mV over −40°C to +125°C ambient, critical for industrial sensor front-ends. |
| Operating Current | 60µA to 15mA; supports ultra-low-power IoT nodes (e.g., 60µA sleep mode) and higher-current data acquisition systems. |
| Dynamic Impedance | ≤1.5Ω at 1mA/120Hz; minimizes output voltage shift under load transients, enabling stable bias for op-amp input stages. |
| Output Noise | 28µVRMS (10Hz–10kHz); low enough to avoid degrading SNR in 16-bit SAR ADC reference paths. |
| Long-Term Stability | 120ppm after 1000h; translates to <0.15mV drift over 1 year, supporting calibration-critical medical devices. |
Pinout & Package
SC70-3 surface-mount package (1.8mm × 1.8mm), 50% smaller than SOT23-3, optimized for space-constrained PCBs in wearables and handheld test equipment.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (+) | Anode (positive terminal) | Connected to system ground or low-impedance return path; reverse current flows into this pin during regulation. |
| 2 (−) | Cathode (negative terminal) | Connected to regulated voltage node; maintains 1.225V above pin 1 when shunt current is applied. |
| 3 (N.C.) | No connection | Must be left floating or tied to pin 2; not internally bonded-incorrect connection causes parametric failure. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small SC70-3 footprint | 1.8mm × 1.8mm area saves >50% board space vs. SOT23-3, enabling dense mixed-signal layouts in portable gear. |
| No output capacitor required | Eliminates BOM cost and layout risk of external stabilization caps while ensuring stability with any capacitive load up to 10µF. |
| Wide shunt current range | 60µA minimum start-up current allows operation in µA-level power domains; 15mA upper limit supports high-precision active filter biasing. |
| Laser-trimmed accuracy | ±0.2% initial tolerance achieved via on-die resistor trimming-no post-package calibration needed for production line test. |
| Robust thermal performance | Specified from −40°C to +125°C with guaranteed 50ppm/°C tempco, enabling deployment in automotive cabin modules and industrial PLC I/O cards. |
Applications
| Portable Instrumentation | Battery-Powered Sensors |
|---|---|
Use Scenario: Handheld multimeter reference rail for 3½-digit display accuracy. IC Role / Device Role / Timing Role: Shunt voltage reference providing stable 1.225V for ADC conversion reference and analog front-end biasing. Use Value: ±0.2% initial accuracy and 50ppm/°C tempco ensure measurement repeatability within ±0.05% full-scale across temperature swings. | Use Scenario: Low-power environmental sensor node (temperature/humidity) powered by coin cell. IC Role / Device Role / Timing Role: Precision bias source for op-amp signal conditioning and ADC reference in sub-100µA sleep-mode systems. Use Value: 60µA minimum operating current enables continuous sensing without compromising battery life beyond 2 years. |
| Industrial Process Control | Medical Diagnostic Equipment |
Use Scenario: 4–20mA transmitter loop-powered analog output stage. IC Role / Device Role / Timing Role: Stable 1.225V reference for DAC output scaling and current-loop driver offset calibration. Use Value: 120ppm long-term stability reduces annual recalibration frequency in field-deployed control valves. | Use Scenario: Portable ECG amplifier requiring low-noise, drift-free DC bias for electrode interface. IC Role / Device Role / Timing Role: Ultra-low-noise (28µVRMS) shunt reference for op-amp common-mode voltage setting. Use Value: Sub-30µVRMS noise prevents baseline wander artifacts in 100dB SNR ECG signal chains. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLVH431ACDBVR | 2.5V fixed output; adjustable via external resistors; 100ppm/°C max tempco; 80µA min current. | Requires external resistive divider for 1.225V; higher tempco increases drift in wide-temperature medical devices. | Select when adjustable output or higher voltage rails are needed; avoid where 1.225V direct replacement and low drift are mandatory. |
| REF3012AIDBZR | 1.2V output; ±0.2% initial accuracy; 50ppm/°C max tempco; 50µA min current; 35µVRMS noise. | 1.2V vs. 1.225V creates 20.8mV offset in precision 12-bit systems; slightly higher noise impacts high-resolution sensor digitization. | Choose for tighter 50µA start-up current; verify 20mV output mismatch is acceptable in system gain calibration. |
Compared with LM4051BIX3-1.2+T, TLVH431ACDBVR offers adjustability but sacrifices output precision and thermal stability, while REF3012AIDBZR matches accuracy and tempco but introduces a 20mV voltage offset and higher noise-both require design validation before substitution.
Availability
LM4051BIX3-1.2+T is available at Aetrix Electronics and suitable for portable instrumentation, battery-powered sensors, and industrial process control requiring stable component supply with RoHS-compliant packaging and full traceability.
Supply support for LM4051BIX3-1.2+T 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
Maxim Integrated (now part of Analog Devices) designs precision analog and mixed-signal ICs for demanding industrial, medical, and communications applications.
The LM4050/LM4051 product line delivers micropower shunt voltage references with fixed outputs from 1.225V to 5.000V, targeting space-constrained, high-accuracy systems where stability, low noise, and wide temperature operation are essential.
FAQ
What is the exact output voltage tolerance of LM4051BIX3-1.2+T at +25°C?
The LM4051BIX3-1.2+T has a guaranteed reverse breakdown voltage of 1.225V with ±0.2% initial accuracy at +25°C, corresponding to a tolerance range of 1.2226V to 1.2275V. This specification is laser-trimmed and production-tested per Maxim's datasheet revision 3, ensuring compliance without post-manufacture calibration.
Can LM4051BIX3-1.2+T operate without an external output capacitor?
Yes, LM4051BIX3-1.2+T does not require an external output capacitor for stability and remains functional with any capacitive load-from 0pF to 10µF. Its internal compensation eliminates phase-margin risks, making it ideal for dynamically loaded circuits like switched-capacitor filters or multiplexed sensor interfaces where capacitor placement is impractical.
What is the minimum operating current for LM4051BIX3-1.2+T, and why does it matter?
The LM4051BIX3-1.2+T requires a minimum shunt current of 60µA to maintain regulation. Below this threshold, output voltage collapses and accuracy degrades. This defines the lower bound of usable current in ultra-low-power designs-e.g., coin-cell-powered sensors must ensure ≥60µA total load plus margin to guarantee valid 1.225V reference operation.
How does the SC70-3 package of LM4051BIX3-1.2+T compare to SOT23-3 in size and thermal performance?
The SC70-3 package of LM4051BIX3-1.2+T measures 1.8mm × 1.8mm, 50% smaller than the standard SOT23-3 (2.9mm × 1.6mm). Its thermal resistance is 2.17mW/°C above +70°C, limiting max power dissipation to 174mW at +70°C-lower than SOT23-3's 320mW, so designers must verify junction temperature stays ≤+150°C under worst-case load and ambient conditions.
Is LM4051BIX3-1.2+T compatible with lead-free reflow processes?
Yes, LM4051BIX3-1.2+T carries the "+" suffix indicating RoHS-compliant, lead-free termination. It is qualified for standard Pb-free reflow profiles per JEDEC J-STD-020, with peak temperature up to +260°C and 60-second liquidus time. The SC70-3 package withstands thermal cycling without delamination or solder joint fatigue in high-reliability consumer and industrial assemblies.
LM4051BIX3-1.2+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- SC-70, SOT-323
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Reference Type:
- Shunt
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 1.225V
- Voltage - Output (Max):
- -
- Current - Output:
- 15 mA
- Tolerance:
- ±0.2%
- Temperature Coefficient:
- 50ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 20µVrms
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 60 µA
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-3
LM4051BIX3-1.2+T FAQ
1.How can I place an order for LM4051BIX3-1.2+T through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4051BIX3-1.2+T 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 LM4051BIX3-1.2+T reliable?
The price and inventory of LM4051BIX3-1.2+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4051BIX3-1.2+T is usually 5 days.
3.What payment methods are accepted for LM4051BIX3-1.2+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4051BIX3-1.2+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4051BIX3-1.2+T?
LM4051BIX3-1.2+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4051BIX3-1.2+T 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 LM4051BIX3-1.2+T?
For technical support, including LM4051BIX3-1.2+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4051BIX3-1.2+T requirements.
6.How does Aetrix verify that LM4051BIX3-1.2+T is sourced from the original manufacturer or authorized distributors?
All LM4051BIX3-1.2+T 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 LM4051BIX3-1.2+T meets industry standards.
7.What is the process for return or replacement of LM4051BIX3-1.2+T?
All LM4051BIX3-1.2+T units undergo pre-shipment inspection (PSI). If there is an issue with LM4051BIX3-1.2+T, 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 LM4051BIX3-1.2+T part is unused and in its original packaging.
Return procedure for LM4051BIX3-1.2+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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