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Texas Instruments LM285BXZ-2.5/NOPB
- Part No.:
- LM285BXZ-2.5/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-226-3, TO-92-3 (TO-226AA)
- Datasheet:
-
LM285BXZ-2.5/NOPB.pdf
- Description:
- IC VREF SHUNT 1.5% TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:387
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Product details
Overview
LM285BXZ-2.5/NOPB from Texas Instruments is a micropower 2-terminal band-gap voltage reference delivering a precise 2.5 V output with ±20 mV (±0.8%) initial tolerance, 0.6 Ω dynamic impedance, and operation over 20 μA to 20 mA supply current. It serves as a stable reference in portable meters, battery-powered analog circuits, and precision current sources where low power and temperature stability are critical.
For engineers reviewing the LM285BXZ-2.5/NOPB datasheet, LM285BXZ-2.5/NOPB pinout, LM285BXZ-2.5/NOPB application, or LM285BXZ-2.5/NOPB equivalent, key selection criteria include operating temperature range (−40°C to +85°C), TO-92 package compatibility, micropower current capability down to 20 μA, and verified long-term stability of 20 ppm over 1000 hours.
Technical Context
The LM285BXZ-2.5/NOPB uses a band-gap core architecture with on-chip trimming for tight voltage accuracy. Its 2-terminal configuration simplifies layout and eliminates external bias components, while its exceptionally low dynamic impedance ensures minimal output variation under load transients.
Designed for wide-current-range operation (20 μA–20 mA), it replaces older references with tighter tolerance and lower noise (120 μV rms, 10 Hz–10 kHz). Its temperature coefficient is rated at 150 ppm/°C (standard grade), enabling stable performance across industrial ambient conditions without active compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.5 V ±20 mV - Ensures accurate ADC/DAC biasing and sensor excitation within 0.8% error at 25°C. |
| Initial Tolerance | ±0.8% (A grade) - Reduces calibration overhead in production test for portable instrumentation. |
| Operating Current Range | 20 μA to 20 mA - Supports ultra-low-power sleep modes and high-accuracy active measurement simultaneously. |
| Dynamic Impedance | 0.6 Ω - Minimizes output voltage droop during transient load steps in precision current-source designs. |
| Temperature Coefficient | 150 ppm/°C - Limits reference drift to <±1.25 mV over −40°C to +85°C, suitable for unheated industrial enclosures. |
| Long-Term Stability | 20 ppm (1000 hr) - Guarantees minimal calibration drift in field-deployed equipment over extended service life. |
| Wideband Noise | 120 μV rms (10 Hz–10 kHz) - Enables use in high-resolution 16-bit+ data acquisition without added filtering. |
Pinout & Package
LM285BXZ-2.5/NOPB is housed in a 3-pin TO-92 plastic package (Package Drawing LP0003A), with leads formed for through-hole mounting. Pin 1 is the cathode, Pin 2 is the anode, and Pin 3 is internally connected to the die attach pad and may be left floating or tied to Pin 2 per TI design guidance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Cathode | Output terminal - connects to regulated node; reverse-biased operation establishes 2.5 V reference potential. |
| Pin 2 | Anode | Current sink terminal - ties to ground or current-setting resistor; defines operating current path. |
| Pin 3 | Die Attach Pad | Internally bonded to substrate - electrically isolated from active circuitry; may be left floating or shorted to Pin 2 for thermal or mechanical stability. |
Key Features
| Feature | Design Value |
|---|---|
| Capacitive Load Tolerance | Stable with unlimited capacitive loading - eliminates need for series isolation resistors in battery-monitoring circuits. |
| Micropower Operation | 20 μA minimum operating current - extends shelf life of coin-cell-powered devices beyond 5 years. |
| Low Dynamic Impedance | 0.6 Ω - maintains reference accuracy under fast-switching loads in programmable current sources. |
| Hermetic Alternative Available | TO package variant (e.g., LM285BXM-2.5/NOPB) offers SOIC-8 for surface-mount reliability - enables drop-in upgrade path for reflow assembly. |
| ESD Robustness | 2 kV HBM rating - withstands handling in standard lab environments without special ESD precautions. |
Applications
| Portable Multimeter Reference | Micropower Sensor Excitation |
|---|---|
Use Scenario: Battery-powered handheld multimeter requiring stable 2.5 V reference for 16-bit ADC scaling over 0–10 V input range. IC Role / Device Role / Timing Role: 2-terminal shunt reference providing precision voltage reference for analog front-end gain and offset calibration. Use Value: Enables ±0.1% full-scale accuracy with no warm-up delay and <30 μA total quiescent current draw. | Use Scenario: Low-power RTD or strain-gauge bridge excitation in wireless condition-monitoring node powered by Li-SOCl₂ cell. IC Role / Device Role / Timing Role: Precision current source element (with external transistor/resistor) delivering stable 100 μA bridge current. Use Value: Maintains <±0.05% current regulation across −40°C to +70°C, eliminating thermal drift compensation circuitry. |
| Calibration Standard for Field Instruments | Thermocouple Cold-Junction Compensation |
Use Scenario: Portable calibrator used to verify industrial 4–20 mA transmitters in field service vans with limited battery capacity. IC Role / Device Role / Timing Role: Primary voltage reference for DAC-based output generation and internal self-test circuitry. Use Value: Delivers 20 ppm/1000 hr stability, reducing annual recalibration frequency and enabling traceable 0.02% output accuracy. | Use Scenario: Embedded cold-junction compensator in thermocouple-based furnace controller operating continuously at 85°C ambient. IC Role / Device Role / Timing Role: Temperature-stable reference for generating Kelvin-proportional compensation voltage (e.g., 1.8 μA/°K). Use Value: Achieves <±1°C measurement accuracy over full industrial temperature range without external temperature sensor. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM385BXZ-2.5/NOPB | 0°C to +70°C operating range; identical TO-92 package and pinout; same 2.5 V ±20 mV tolerance and 0.6 Ω impedance. | Restricted to commercial-temperature applications; unsuitable for industrial control cabinets or outdoor enclosures. | Select when cost sensitivity outweighs extended temperature coverage and ambient exceeds 70°C is not required. |
| LM285BXM-2.5/NOPB | SOIC-8 surface-mount package; same −40°C to +85°C range and electrical specs; includes exposed thermal pad for improved dissipation. | Requires PCB redesign for SMT assembly; supports higher-volume automated manufacturing and better thermal management. | Choose for new designs targeting automated production, space-constrained layouts, or enhanced thermal performance. |
Compared with LM385BXZ-2.5/NOPB, the LM285BXZ-2.5/NOPB extends operational reliability to −40°C, making it suitable for outdoor or automotive-adjacent instrumentation; compared with LM285BXM-2.5/NOPB, it retains legacy through-hole compatibility while sacrificing thermal performance and SMT scalability.
Availability
LM285BXZ-2.5/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, industrial sensor nodes, and field-service calibration tools requiring stable component supply, consistent parametric performance, and long-term availability assurance.
Supply support for LM285BXZ-2.5/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 over 50 years of innovation in precision analog ICs.
The LM285 family was designed specifically for micropower, high-stability voltage reference applications in battery-operated and industrial-grade measurement systems where size, power, and long-term accuracy are critical constraints.
FAQ
What is the maximum reverse current rating for LM285BXZ-2.5/NOPB?
The absolute maximum reverse current for LM285BXZ-2.5/NOPB is 30 mA. Exceeding this value risks permanent damage. For reliable operation, the recommended reverse current range is 20 μA to 20 mA, where the device maintains specified voltage accuracy, dynamic impedance, and temperature stability. Always verify current-limiting resistor values in series with LM285BXZ-2.5/NOPB to ensure compliance under worst-case supply and load conditions.
Can LM285BXZ-2.5/NOPB be used in place of LM385-2.5-N in a commercial-temperature design?
Yes, LM285BXZ-2.5/NOPB can replace LM385-2.5-N in commercial-temperature applications, as both share identical electrical specifications (2.5 V ±20 mV, 0.6 Ω impedance, 20 μA–20 mA range) and TO-92 packaging. However, LM285BXZ-2.5/NOPB operates from −40°C to +85°C versus LM385-2.5-N's 0°C to +70°C range-so it provides margin for ambient variations without performance penalty.
Does LM285BXZ-2.5/NOPB require an external capacitor for stability?
No, LM285BXZ-2.5/NOPB does not require an external capacitor for stability. Its design is exceptionally tolerant of capacitive loading-including unlimited capacitance-due to internal compensation. This eliminates the need for series isolation resistors or external bypass caps in most applications, simplifying layout and improving reliability in battery-powered systems.
What is the thermal resistance (θJA) of LM285BXZ-2.5/NOPB in TO-92 package?
The junction-to-ambient thermal resistance (θJA) for LM285BXZ-2.5/NOPB in the TO-92 package is 283°C/W under standard JEDEC test conditions (0.125″ lead length). This value assumes natural convection on a 1-inch² copper pad; actual thermal performance improves with larger copper areas or airflow. Maximum junction temperature remains 125°C at +85°C ambient under 20 mA operation.
Is LM285BXZ-2.5/NOPB RoHS compliant and lead-free?
Yes, LM285BXZ-2.5/NOPB is RoHS compliant and lead-free. Per TI's Packaging Information, it carries the "/NOPB" suffix indicating lead-free finish, conforms to EU RoHS requirements for all 10 restricted substances, and uses SnAgCu (SAC) or equivalent lead-free termination. The device is rated Level-1 for moisture sensitivity with unlimited floor life under dry storage conditions.
LM285BXZ-2.5/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA)
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Reference Type:
- Shunt
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- -
- Current - Output:
- 20 mA
- Tolerance:
- ±1.5%
- Temperature Coefficient:
- 30ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 120µVrms
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 20 µA
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-92-3
LM285BXZ-2.5/NOPB FAQ
1.How can I place an order for LM285BXZ-2.5/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM285BXZ-2.5/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 LM285BXZ-2.5/NOPB reliable?
The price and inventory of LM285BXZ-2.5/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM285BXZ-2.5/NOPB is usually 5 days.
3.What payment methods are accepted for LM285BXZ-2.5/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM285BXZ-2.5/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM285BXZ-2.5/NOPB?
LM285BXZ-2.5/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM285BXZ-2.5/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 LM285BXZ-2.5/NOPB?
For technical support, including LM285BXZ-2.5/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM285BXZ-2.5/NOPB requirements.
6.How does Aetrix verify that LM285BXZ-2.5/NOPB is sourced from the original manufacturer or authorized distributors?
All LM285BXZ-2.5/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 LM285BXZ-2.5/NOPB meets industry standards.
7.What is the process for return or replacement of LM285BXZ-2.5/NOPB?
All LM285BXZ-2.5/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM285BXZ-2.5/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 LM285BXZ-2.5/NOPB part is unused and in its original packaging.
Return procedure for LM285BXZ-2.5/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM285BXZ-2.5/NOPB Tags
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