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Texas Instruments LM285BXZ/NOPB
- Part No.:
- LM285BXZ/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-226-3, TO-92-3 (TO-226AA)
- Datasheet:
-
LM285BXZ/NOPB.pdf
- Description:
- IC VREF SHUNT ADJ 1% TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:604
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Product details
Overview
LM285BXZ/NOPB from Texas Instruments is a 3-terminal adjustable micropower band-gap voltage reference diode operating from 1.24 V to 5.30 V with 1% initial tolerance, 1 Ω dynamic impedance, and −40°C to 85°C temperature range. It serves as a precision shunt reference in battery-powered instrumentation, portable regulators, and low-power analog circuits requiring stable, low-drift references.
For engineers reviewing the LM285BXZ/NOPB datasheet, LM285BXZ/NOPB pinout, LM285BXZ/NOPB application, or LM285BXZ/NOPB equivalent, key selection factors include its 10 μA minimum operating current, 20 mA max output current capability, TO-92 package compatibility, and 50 ppm/°C typical temperature coefficient for precision voltage setting in space-constrained designs.
Technical Context
The LM285BXZ/NOPB implements a band-gap reference core using only transistors and resistors-enabling low noise (50 μVRMS at 10 Hz–10 kHz), excellent long-term stability (20 ppm over 1000 hours), and tolerance of capacitive loading without oscillation. Its two-terminal shunt topology simplifies integration into feedback loops of linear regulators and voltage monitors.
It operates across a wide dynamic current range (10 μA to 20 mA), allowing direct replacement of legacy references while delivering tighter initial tolerance and lower dynamic impedance. On-chip trimming ensures 1% initial accuracy at 100 μA test current, and its thermal characteristics are optimized for TO-92 packages with θJA = 440°C/W.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage Range | Adjustable from 1.24 V to 5.30 V via external resistor divider - enables precise custom reference generation for ADCs, DACs, and comparators. |
| Initial Tolerance | ±1% at 100 μA - guarantees tight voltage setting without post-manufacture calibration in production systems. |
| Dynamic Impedance | 1 Ω at 100 μA - minimizes output voltage variation under load transients, critical for high-accuracy feedback paths. |
| Operating Current Range | 10 μA to 20 mA - supports ultra-low-power sensor nodes and high-current shunt regulation without external buffering. |
| Temperature Coefficient | 50 ppm/°C (typical) - ensures ≤0.4 mV drift over full −40°C to 85°C range when set to 2.5 V, suitable for industrial-grade measurement. |
| Output Noise | 50 μVRMS (10 Hz–10 kHz, VREF = 2.5 V) - low enough for 16-bit+ data acquisition without additional filtering. |
| Long-Term Stability | 20 ppm over 1000 hours - reduces calibration frequency in field-deployed equipment and medical monitoring devices. |
Pinout & Package
LM285BXZ/NOPB is housed in a 3-pin TO-92 plastic package (JEDEC TO-226-AA), 5.34 mm maximum height, with straight or formed leads. The package supports through-hole mounting and is RoHS-compliant with green (Pb-free, no Sb/Br) finish and CU SN lead plating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Current sink input | Connects to system ground or negative rail; sets reference node for cathode voltage regulation. |
| Cathode (Pin 2) | Regulated output | Provides stable reference voltage; connects to feedback node of regulator or input of comparator/ADC. |
| NC / Case (Pin 3) | Package tab / mechanical ground | No internal connection; electrically isolated - used for mechanical mounting and thermal dissipation only. |
Key Features
| Feature | Design Value |
|---|---|
| Capacitive load tolerance | Stable with ≥10 nF output capacitance - eliminates need for external isolation resistor in noisy environments. |
| Micropower operation | 10 μA minimum operating current - extends battery life in portable meters and IoT edge sensors beyond 10 years. |
| Wide current compliance | 20 mA max output current - enables direct driving of op-amp inputs or small logic loads without buffer stages. |
| Low-noise architecture | 50 μVRMS broadband noise - avoids signal degradation in precision analog front-ends for strain gauges and thermocouples. |
| Hermetic-equivalent stability | 20 ppm long-term drift - matches performance of higher-cost ceramic-packaged references in cost-sensitive applications. |
Applications
| Precision Portable Instrumentation | Battery-Powered Sensor Nodes |
|---|---|
Use Scenario: Handheld multimeter requiring stable 2.5 V reference for 16-bit ADC conversion across −10°C to 50°C ambient. IC Role / Device Role / Timing Role: Shunt voltage reference providing regulated node for ADC reference input and op-amp biasing. Use Value: 1% initial tolerance and 50 ppm/°C TC ensure <±0.5 LSB error over temperature without recalibration. | Use Scenario: Wireless temperature sensor node powered by CR2032 coin cell, transmitting every 5 minutes. IC Role / Device Role / Timing Role: Reference source for microcontroller's internal ADC and comparator threshold generation. Use Value: 10 μA minimum operating current enables >5-year battery life while maintaining ±1.25 mV reference accuracy. |
| Low-Power Linear Regulator Feedback | Industrial Process Monitoring |
Use Scenario: 3.3 V LDO regulator for microcontroller supply in remote telemetry unit with variable input (4–12 V). IC Role / Device Role / Timing Role: Adjustable shunt reference in feedback divider network controlling LDO output voltage. Use Value: 1 Ω dynamic impedance prevents loop instability during load steps, ensuring <10 μs settling time. | Use Scenario: 4–20 mA transmitter module operating in factory environment (−25°C to 70°C). IC Role / Device Role / Timing Role: Precision voltage reference for current-loop DAC and fault-detection comparator. Use Value: −40°C to 85°C rating and 20 ppm/°C max TC guarantee <0.1% full-scale error across entire operating range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLVH431ACDBVR | 2.5 V fixed + adjustable (2.5–36 V); 0.5% initial tolerance; 0.2 Ω dynamic impedance; SO-8 package. | Higher accuracy and lower impedance, but requires minimum 80 μA cathode current and lacks TO-92 form factor. | Select when higher precision and surface-mount compatibility outweigh through-hole requirement and micropower needs. |
| LM385BXZ/NOPB | Same architecture and TO-92 package; 0°C to 70°C temp range; 2% initial tolerance; 100 ppm/°C TC (max). | Lower cost and commercial-temp grade; suitable for non-industrial consumer electronics where extended temperature is not required. | Select for cost-sensitive, non-automotive applications where −40°C operation and 1% tolerance are unnecessary. |
Compared with TLVH431ACDBVR, LM285BXZ/NOPB offers superior micropower operation (10 μA vs. 80 μA) and wider temperature range (−40°C to 85°C), but trades off absolute accuracy and dynamic impedance. Compared with LM385BXZ/NOPB, it delivers tighter tolerance and better TC at the cost of higher price and narrower commercial availability.
Availability
LM285BXZ/NOPB is available at Aetrix Electronics and suitable for precision instrumentation, battery-powered sensing, and industrial process monitoring requiring stable component supply with full traceability and lifecycle continuity.
Supply support for LM285BXZ/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 power management technologies, with decades of leadership in precision analog ICs.
The LM285 series belongs to TI's micropower voltage reference product line, designed specifically for battery-operated and space-constrained applications demanding low quiescent current, stable output, and robust temperature performance.
FAQ
What is the operating temperature range of the LM285BXZ/NOPB?
The LM285BXZ/NOPB is rated for operation from −40°C to +85°C. This industrial temperature range ensures reliable performance in outdoor instrumentation, automotive cabin modules, and factory-floor controllers. The device's thermal characteristics-including θJA = 440°C/W-are specified for the TO-92 package under free-air conditions, and derating curves are provided in the datasheet for elevated ambient temperatures.
Can the LM285BXZ/NOPB be used as a 2.5 V reference?
Yes, the LM285BXZ/NOPB can be configured as a precise 2.5 V reference using an external resistor divider between cathode and anode. With its 1.24 V to 5.30 V adjustment range and 1% initial tolerance, it achieves ±25 mV absolute accuracy at 2.5 V without trimming. The datasheet provides standard circuit configurations (e.g., Figure 6) and confirms stability with common capacitor values up to 100 nF on the cathode node.
What is the minimum cathode current required for regulation in the LM285BXZ/NOPB?
The LM285BXZ/NOPB requires a minimum cathode current of 10 μA to maintain regulation, as specified in the Electrical Characteristics table. Below this threshold, the reference voltage deviates significantly from nominal. This ultra-low minimum current enables use in energy-harvesting systems and ultra-long-life battery applications where average current must remain below 100 μA.
Does the LM285BXZ/NOPB require an external capacitor for stability?
No, the LM285BXZ/NOPB is explicitly designed to be tolerant of capacitive loading and remains stable with output capacitances up to at least 100 nF, per the datasheet's "Capacitive Loading" section. Unlike many older shunt references, it does not require an external series resistor or isolation capacitor-simplifying layout and reducing BOM count in compact PCB designs.
How does the LM285BXZ/NOPB compare to the LM385BXZ/NOPB in terms of temperature performance?
The LM285BXZ/NOPB offers superior temperature performance versus the LM385BXZ/NOPB: it is rated for −40°C to +85°C (vs. 0°C to +70°C), has a tighter 1% initial tolerance (vs. 2%), and a lower 50 ppm/°C typical temperature coefficient (vs. 100 ppm/°C). These differences make LM285BXZ/NOPB suitable for industrial and extended-temperature applications where LM385BXZ/NOPB would drift outside specification.
LM285BXZ/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:
- Adjustable
- Voltage - Output (Min/Fixed):
- 1.24V
- Voltage - Output (Max):
- 5.3 V
- Current - Output:
- 20 mA
- Tolerance:
- ±1%
- Temperature Coefficient:
- 30ppm/°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:
- Through Hole
- Supplier Device Package:
- TO-92-3
LM285BXZ/NOPB FAQ
1.How can I place an order for LM285BXZ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM285BXZ/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/NOPB reliable?
The price and inventory of LM285BXZ/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/NOPB is usually 5 days.
3.What payment methods are accepted for LM285BXZ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM285BXZ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM285BXZ/NOPB?
LM285BXZ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM285BXZ/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/NOPB?
For technical support, including LM285BXZ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM285BXZ/NOPB requirements.
6.How does Aetrix verify that LM285BXZ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM285BXZ/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/NOPB meets industry standards.
7.What is the process for return or replacement of LM285BXZ/NOPB?
All LM285BXZ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM285BXZ/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/NOPB part is unused and in its original packaging.
Return procedure for LM285BXZ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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