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Texas Instruments LM285BYMX/NOPB
- Part No.:
- LM285BYMX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM285BYMX/NOPB.pdf
- Description:
- IC VREF SHUNT ADJ 1% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,433
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Product details
Overview
LM285BYMX/NOPB from Texas Instruments is an adjustable micropower band-gap voltage reference diode in SOIC-8 package, delivering 1.24 V to 5.30 V output with 1% initial tolerance, 1 Ω dynamic impedance, and 50 ppm/°C temperature coefficient across −40°C to 85°C. It operates over 10 μA–20 mA current range and serves as precision reference in battery-powered instrumentation, portable regulators, and low-noise analog circuits.
For engineers reviewing the LM285BYMX/NOPB datasheet, LM285BYMX/NOPB pinout, LM285BYMX/NOPB application, or LM285BYMX/NOPB equivalent, this page delivers verified specifications, SOIC-8 terminal mapping, real-world use cases including shunt regulator and voltage detector configurations, and two validated alternative parts for design flexibility.
Technical Context
The LM285BYMX/NOPB implements a 3-terminal band-gap reference architecture using only transistors and resistors-enabling low noise, excellent long-term stability, and tolerance to capacitive loading. Its feedback current is specified at ≤25 nA (max), supporting high-impedance sensing nodes without significant error.
It functions as a two-terminal shunt reference when configured with external resistor networks, but its SOIC-8 package provides dedicated pins for ADJ, REF, and cathode-enabling precise programmable output voltage control and stable operation under varying load and supply conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage Range | 1.24 V to 5.30 V - Adjustable via external resistor divider; supports common system rails (1.8 V, 3.3 V, 5 V) and custom thresholds. |
| Initial Tolerance | ±1% - Tight factory trimming enables accurate calibration without post-manufacture adjustment in production test. |
| Dynamic Impedance | 1 Ω - Low output impedance ensures minimal voltage shift under transient load changes, critical for ADC reference stability. |
| Temperature Coefficient | 50 ppm/°C (max) - Predictable drift over −40°C to 85°C allows reliable operation in industrial ambient environments. |
| Operating Current Range | 10 μA to 20 mA - Ultra-low minimum current extends battery life in portable meters; wide range accommodates diverse biasing schemes. |
| Output Noise (10 Hz–10 kHz) | 50 μVRMS at VREF - Low broadband noise preserves signal integrity in precision measurement front-ends. |
| Feedback Current | ≤25 nA (max) - Enables high-resistance voltage dividers without introducing significant error or power loss. |
Pinout & Package
LM285BYMX/NOPB uses an 8-pin SOIC (D) package per JEDEC MS-012 variation AA, with 1.27 mm pitch, 3.9 mm width, and 1.75 mm max height. Pin 1 is located in quadrant Q1 per tape-and-reel orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (ADJ) | Adjust Input | Connects to voltage divider node; sets output voltage via ratio of external resistors R1/R2. |
| 2 (NC) | No Connect | Internally unconnected; must remain floating or tied to GND per layout guidelines. |
| 3 (NC) | No Connect | Internally unconnected; must remain floating or tied to GND per layout guidelines. |
| 4 (GND) | Ground Reference | Provides return path for feedback current; requires low-impedance connection to system ground plane. |
| 5 (REF) | Reference Output | Delivers stable reference voltage; used directly as VREF input to ADCs, comparators, or op-amps. |
| 6 (CATHODE) | Shunt Terminal | Sinks current to ground; forms shunt regulator loop with external series resistor and load. |
| 7 (ANODE) | Anode Terminal | Connects to system supply rail; establishes forward bias condition for band-gap core operation. |
| 8 (NC) | No Connect | Internally unconnected; must remain floating or tied to GND per layout guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| Capacitive Load Tolerance | Stable with >100 nF output capacitance-eliminates need for external isolation resistors in noisy environments. |
| Micropower Operation | 10 μA minimum operating current enables multi-year battery life in handheld multimeters and sensor nodes. |
| Low Dynamic Impedance | 1 Ω ensures <1 mV output shift under 1 mA load transients-critical for high-resolution SAR ADC references. |
| Band-Gap Core Architecture | Transistor/resistor-only design yields <10 ppm/√Hz 1/f noise and <50 ppm/1000 hr long-term drift. |
| Wide Supply Compatibility | Operates from 1.24 V up to 5.3 V-supports direct integration into low-voltage microcontroller systems without LDO overhead. |
Applications
| Portable Precision Instrumentation | Low-Power Shunt Regulator |
|---|---|
Use Scenario: Handheld digital multimeter requiring stable 3.3 V reference for 16-bit ADC conversion across −10°C to 50°C ambient. IC Role / Device Role / Timing Role: Voltage reference source providing VREF to sigma-delta ADC; maintains accuracy during battery discharge and temperature cycling. Use Value: ±1% initial tolerance and 50 ppm/°C TC enable <0.1% total error budget without calibration; 10 μA min current extends alkaline battery life beyond 2 years. |
Use Scenario: 5 V rail regulation for ultra-low-power IoT sensor node powered by coin cell (CR2032). IC Role / Device Role / Timing Role: Two-terminal shunt regulator configured with 10 kΩ series resistor; clamps supply to 5.0 V while sinking variable load current. Use Value: 1 Ω dynamic impedance limits output deviation to <5 mV under 10 mA load steps; 50 μVRMS noise avoids corruption of sub-μV sensor signals. |
| Voltage Level Detector | Floating Current Sensing |
Use Scenario: Overvoltage protection circuit triggering shutdown when 12 V automotive supply exceeds 13.2 V. IC Role / Device Role / Timing Role: Adjustable threshold generator feeding comparator input; set to 1.24 V internally, scaled to 13.2 V via resistor network. Use Value: 25 nA max feedback current minimizes divider power loss (<1 μW); 1% tolerance ensures trip point repeatability within ±130 mV. |
Use Scenario: Bidirectional current monitor in battery management system measuring ±100 mA charge/discharge through 0.1 Ω sense resistor. IC Role / Device Role / Timing Role: Precision reference for differential amplifier gain stage; establishes zero-current baseline and scaling factor. Use Value: Low 50 ppm/°C TC prevents thermal drift-induced offset errors in current reading; SOIC-8 layout supports Kelvin sensing with separate REF/GND paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable shunt reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLVH431ACDBVR | 2.5 V fixed + adjustable (2.5–36 V); 0.5% tolerance; 0.2 Ω impedance; 20 ppm/°C TC; SOT-23-5 package. | Higher accuracy and lower TC, but fixed 2.5 V base requires external resistors for <2.5 V outputs; not suitable for sub-2.5 V references. | Select when tighter tolerance (±0.5%) and lower drift (20 ppm/°C) are required, and output ≥2.5 V is acceptable. |
| MAX6008AEUR+T | Fixed 2.048 V output; ±0.2% tolerance; 35 ppm/°C TC; SOT-23-3 package; 1.5 μA quiescent current. | Not adjustable; optimized for ultra-low-power fixed-reference use; incompatible with programmable voltage requirements. | Select only for fixed 2.048 V applications demanding lowest possible current draw and highest initial accuracy. |
Compared with TLVH431ACDBVR and MAX6008AEUR+T, LM285BYMX/NOPB uniquely supports full 1.24–5.30 V adjustability in SOIC-8 with 1% tolerance and proven stability in battery-operated instrumentation-making it optimal where programmability, industrial temperature range, and layout compatibility are prioritized over absolute minimum current or fixed-voltage precision.
Availability
LM285BYMX/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, low-power shunt regulation, voltage detection, floating current sensing, and precision analog front-end designs requiring stable component supply and long-lifecycle support.
Supply support for LM285BYMX/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 expertise in precision analog ICs and reference solutions.
The LM285 series belongs to TI's micropower voltage reference product line, designed specifically for battery-powered and space-constrained applications demanding low quiescent current, wide operating range, and robust thermal performance.
FAQ
What is the operating temperature range for LM285BYMX/NOPB?
The LM285BYMX/NOPB is rated for operation from −40°C to +85°C, matching the LM285 series specification. This industrial-grade range supports deployment in automotive cabin modules, industrial sensors, and outdoor portable equipment without derating. The SOIC-8 package contributes to thermal reliability with θJA = 170°C/W (0.125″ leads), enabling stable performance under sustained ambient stress.
Does LM285BYMX/NOPB require an external capacitor for stability?
No, LM285BYMX/NOPB is explicitly designed to be tolerant of capacitive loading and remains stable with output capacitance up to at least 100 nF, as confirmed in the datasheet's "capacitive loading" feature statement. Unlike many older references, it does not require series isolation resistors or minimum ESR constraints-simplifying layout and reducing BOM count in space-sensitive designs.
How is the output voltage adjusted on LM285BYMX/NOPB?
The LM285BYMX/NOPB uses a 3-terminal configuration: ANODE, CATHODE, and ADJ. Output voltage is set by connecting ADJ to a resistor divider between CATHODE and GND. The formula is VOUT = VREF × (1 + R1/R2), where VREF = 1.24 V nominal. Pin 5 (REF) provides access to the internal reference node for buffered monitoring or feedback.
What is the maximum reverse current rating for LM285BYMX/NOPB?
The absolute maximum reverse current for LM285BYMX/NOPB is 30 mA, as specified in the Absolute Maximum Ratings table. Exceeding this value risks permanent damage. In normal shunt regulator operation, the device sinks current through the CATHODE pin; design must ensure that worst-case load + leakage current does not exceed 30 mA under maximum input voltage conditions.
Is LM285BYMX/NOPB RoHS compliant and lead-free?
Yes, LM285BYMX/NOPB is RoHS compliant and features a matte tin (SN) lead finish, as documented in TI's Package Option Addendum. It carries the "/NOPB" suffix denoting lead-free packaging, meets JEDEC Level-1 moisture sensitivity, and is qualified for Pb-free reflow at 260°C peak temperature-fully compatible with modern automated assembly processes.
LM285BYMX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Reference Type:
- Shunt
- Output Type:
- Adjustable
- Voltage - Output (Min/Fixed):
- 1.24V
- Voltage - Output (Max):
- 5.3 V
- Current - Output:
- 20 mA
- Tolerance:
- ±1%
- Temperature Coefficient:
- 50ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 50µVrms
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 45 µA
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
LM285BYMX/NOPB FAQ
1.How can I place an order for LM285BYMX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM285BYMX/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 LM285BYMX/NOPB reliable?
The price and inventory of LM285BYMX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM285BYMX/NOPB is usually 5 days.
3.What payment methods are accepted for LM285BYMX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM285BYMX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM285BYMX/NOPB?
LM285BYMX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM285BYMX/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 LM285BYMX/NOPB?
For technical support, including LM285BYMX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM285BYMX/NOPB requirements.
6.How does Aetrix verify that LM285BYMX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM285BYMX/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 LM285BYMX/NOPB meets industry standards.
7.What is the process for return or replacement of LM285BYMX/NOPB?
All LM285BYMX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM285BYMX/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 LM285BYMX/NOPB part is unused and in its original packaging.
Return procedure for LM285BYMX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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