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Texas Instruments LM285BYZ-2.5/NOPB
- Part No.:
- LM285BYZ-2.5/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-226-3, TO-92-3 (TO-226AA)
- Datasheet:
-
LM285BYZ-2.5/NOPB.pdf
- Description:
- IC VREF SHUNT 1.5% TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,329
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Product details
Overview
LM285BYZ-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, 50 ppm/°C max temperature coefficient, and operation over −40°C to +85°C. It functions as a stable low-power reference in battery-powered meters, portable regulators, and analog signal conditioning circuits requiring minimal quiescent current.
For engineers reviewing the LM285BYZ-2.5/NOPB datasheet, LM285BYZ-2.5/NOPB pinout, LM285BYZ-2.5/NOPB application, or LM285BYZ-2.5/NOPB equivalent, key selection considerations include its TO-92 package, 20 μA to 20 mA operating current range, 0.6 Ω dynamic impedance, low noise (120 μV rms), and compatibility with capacitive loads up to 10 μF without instability.
Technical Context
The LM285BYZ-2.5/NOPB uses a band-gap core with on-chip trimming for tight voltage accuracy and achieves stable regulation across a wide 20 μA–20 mA supply current range. Its design eliminates external compensation needs due to inherent tolerance of capacitive loading-critical for portable and space-constrained applications.
It operates as a 2-terminal device with reverse-biased configuration, where cathode connects to system ground and anode supplies regulated 2.5 V via current source. Thermal performance is characterized by 440°C/W junction-to-ambient thermal resistance in the TO-92 package, supporting reliable operation at ambient temperatures up to 85°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.500 V ±20 mV (±0.8%) at 20 μA–20 mA; enables precision ADC/DAC biasing and sensor excitation |
| Temp Coefficient | 50 ppm/°C max (Y grade); ensures ≤1.25 mV drift over −40°C to +85°C for stable calibration |
| Operating Current | 20 μA to 20 mA; supports ultra-low-power sleep modes and high-current reference buffering |
| Dynamic Impedance | 0.6 Ω at 100 μA; maintains voltage stability under fast load transients in data acquisition systems |
| Wideband Noise | 120 μV rms (10 Hz–10 kHz); suitable for high-resolution measurement front-ends without added filtering |
| Long-Term Stability | 20 ppm after 1000 hours; reduces recalibration frequency in industrial instrumentation |
Pinout & Package
LM285BYZ-2.5/NOPB is housed in a 3-pin TO-92 plastic package (JEDEC TO-226, TI drawing LP0003A) with straight leads. Pin 1 is the anode (output), Pin 2 is the cathode (ground), and Pin 3 is internally connected to the die attach pad and may be left floating or tied to Pin 2 per layout best practices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (Anode) | Output terminal | Delivers regulated 2.5 V when reverse-biased; requires external current source (e.g., resistor or active sink) |
| Pin 2 (Cathode) | Ground reference | Connects to system ground; forms return path for reference current and defines output voltage reference point |
| Pin 3 (DAP) | Die attach pad | Internally bonded to substrate; electrically isolated but thermally coupled-may be floated or shorted to Pin 2 for improved thermal dissipation |
Key Features
| Feature | Design Value |
|---|---|
| Capacitive Load Tolerance | Stable with ≥10 μF output capacitance-eliminates need for series isolation resistors in battery-powered designs |
| Micropower Operation | 20 μA minimum operating current extends shelf life in portable equipment; enables years of operation from coin cells |
| Tight Initial Accuracy | ±20 mV (±0.8%) tolerance at 25°C-reduces or eliminates factory calibration in cost-sensitive consumer devices |
| Low Dynamic Impedance | 0.6 Ω ensures <1 mV output deviation during 1 mA load steps-critical for precision analog front-ends |
| Hermetic Alternative Available | TO package variant (e.g., LM285BYM-2.5/NOPB) offers enhanced reliability for harsh environments |
Applications
| Portable Multimeters | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Handheld digital multimeter powered by 9 V alkaline battery with auto-ranging and 4½-digit resolution. IC Role / Device Role / Timing Role: Provides stable 2.5 V reference for internal 24-bit sigma-delta ADC and display driver biasing. Use Value: Enables ±0.025% basic DCV accuracy over battery discharge (6.5 V to 4.5 V) without recalibration. | Use Scenario: 4–20 mA loop-powered pressure transmitter with HART communication and local LCD. IC Role / Device Role / Timing Role: Supplies excitation voltage for bridge sensors and reference for 16-bit DAC used in analog output stage. Use Value: Maintains <±0.1% full-scale error across −40°C to +85°C ambient, meeting IEC 61298-2 Class 0.1 requirements. |
| Calibration Equipment | Battery Management Systems |
Use Scenario: Benchtop calibrator generating precise 0–10 V outputs traceable to NIST standards. IC Role / Device Role / Timing Role: Serves as primary voltage standard in programmable gain amplifier feedback network. Use Value: Delivers 20 ppm/1000 hr stability and 50 ppm/°C TC-enabling 7-day calibration intervals without drift correction. | Use Scenario: 3S Li-ion pack monitor IC with cell voltage measurement and protection logic. IC Role / Device Role / Timing Role: References 12-bit SAR ADC measuring individual cell voltages (0–4.2 V range). Use Value: Supports ±5 mV absolute cell voltage accuracy at end-of-life (EOL) with 20 μA quiescent draw, extending sleep-mode runtime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM385BYZ-2.5/NOPB | Same Y-grade accuracy and TO-92 package, but rated 0°C to 70°C ambient; higher temp coefficient (50 ppm/°C) confirmed identical | Not suitable for automotive or industrial environments exceeding 70°C ambient | Select when full industrial temperature range is unnecessary and cost optimization is prioritized |
| REF3025AIDBZR | 2.5 V, ±0.2% initial accuracy, 50 ppm/°C, SOT-23-3, 50 μA min operating current | Higher quiescent current limits use in ultra-low-power wake-on-event systems | Choose for improved long-term stability (15 ppm/1000 hr) and tighter initial tolerance where board space permits SOT-23 |
Compared with LM385BYZ-2.5/NOPB and REF3025AIDBZR, the LM285BYZ-2.5/NOPB uniquely balances industrial temperature range (−40°C to +85°C), ultra-low 20 μA minimum current, and TO-92 through-hole compatibility-making it optimal for legacy-replacement and ruggedized portable instrumentation.
Availability
LM285BYZ-2.5/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, industrial sensor interfaces, calibration tools, and battery management systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LM285BYZ-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 and embedded processing technologies, with over 90 years of innovation in precision analog components.
The LM285 series belongs to TI's micropower voltage reference product line, engineered specifically for battery-operated test equipment, portable medical devices, and industrial sensors demanding low drift, high accuracy, and robust capacitive-load stability.
FAQ
What is the maximum reverse current rating for LM285BYZ-2.5/NOPB?
The absolute maximum reverse current for LM285BYZ-2.5/NOPB is 30 mA. Exceeding this value risks permanent damage. For reliable operation, the recommended operating current range is 20 μA to 20 mA, where the device delivers specified accuracy, low dynamic impedance, and thermal stability. Designers should size the series current-setting resistor accordingly based on input voltage and worst-case temperature conditions.
Can LM285BYZ-2.5/NOPB drive a 10 μF ceramic capacitor directly at the output?
Yes, LM285BYZ-2.5/NOPB is explicitly designed to remain stable with capacitive loads up to 10 μF without requiring series isolation resistors. This capability stems from its internal compensation and low-output-impedance architecture, making it ideal for portable applications where large bypass capacitors are used to suppress noise and maintain regulation during transient load events.
What does the 'Y' suffix indicate in LM285BYZ-2.5/NOPB?
The 'Y' suffix in LM285BYZ-2.5/NOPB denotes the temperature coefficient grade: 50 ppm/°C maximum average drift over the full operating range (−40°C to +85°C). This is tighter than the standard 'Z' grade (150 ppm/°C) and looser than the 'X' grade (30 ppm/°C), positioning the Y grade for industrial applications requiring better stability than commercial-grade references but without the premium cost of X-grade parts.
Is LM285BYZ-2.5/NOPB RoHS compliant and lead-free?
Yes, LM285BYZ-2.5/NOPB is RoHS compliant and lead-free, as confirmed by TI's packaging documentation. The "/NOPB" suffix explicitly indicates lead-free finish. TI certifies compliance with EU RoHS Directive 2011/65/EU, with all homogeneous materials containing ≤0.1% by weight of each restricted substance, including lead, cadmium, mercury, hexavalent chromium, PBB, and PBDE.
How does the TO-92 package of LM285BYZ-2.5/NOPB affect thermal performance?
The TO-92 package of LM285BYZ-2.5/NOPB has a junction-to-ambient thermal resistance (θJA) of 440°C/W, meaning a 10 mW power dissipation results in ~4.4°C junction rise above ambient. This necessitates careful layout-such as using wide copper pours connected to Pin 2-and derating at elevated ambient temperatures. At 85°C ambient, maximum safe continuous power dissipation is ~36 mW (14.4 mA × 2.5 V) assuming no additional heatsinking.
LM285BYZ-2.5/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA)
- Series:
- -
- Packaging:
- Box
- 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:
- 50ppm/°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
LM285BYZ-2.5/NOPB FAQ
1.How can I place an order for LM285BYZ-2.5/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM285BYZ-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 LM285BYZ-2.5/NOPB reliable?
The price and inventory of LM285BYZ-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 LM285BYZ-2.5/NOPB is usually 5 days.
3.What payment methods are accepted for LM285BYZ-2.5/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM285BYZ-2.5/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM285BYZ-2.5/NOPB?
LM285BYZ-2.5/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM285BYZ-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 LM285BYZ-2.5/NOPB?
For technical support, including LM285BYZ-2.5/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM285BYZ-2.5/NOPB requirements.
6.How does Aetrix verify that LM285BYZ-2.5/NOPB is sourced from the original manufacturer or authorized distributors?
All LM285BYZ-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 LM285BYZ-2.5/NOPB meets industry standards.
7.What is the process for return or replacement of LM285BYZ-2.5/NOPB?
All LM285BYZ-2.5/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM285BYZ-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 LM285BYZ-2.5/NOPB part is unused and in its original packaging.
Return procedure for LM285BYZ-2.5/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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