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Texas Instruments LM285BYZ/NOPB
- Part No.:
- LM285BYZ/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-226-3, TO-92-3 (TO-226AA)
- Datasheet:
-
LM285BYZ/NOPB.pdf
- Description:
- IC VREF SHUNT ADJ 1% TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,621
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Product details
Overview
LM285BYZ/NOPB from Texas Instruments is a 3-terminal adjustable micropower band-gap voltage reference diode, rated for operation from −40°C to 85°C, with 2% initial tolerance, 1.24 V to 5.30 V output adjustability, and 1 Ω dynamic impedance. It serves as a precision shunt reference in low-power analog circuits, battery-powered meters, and portable regulators.
For engineers reviewing the LM285BYZ/NOPB datasheet, LM285BYZ/NOPB pinout, LM285BYZ/NOPB application, or LM285BYZ/NOPB equivalent, key selection considerations include its TO-92 package, 10 μA to 20 mA operating current range, temperature coefficient of 50 ppm/°C (Y-suffix), and compatibility with capacitive loading without instability.
Technical Context
The LM285BYZ/NOPB implements a band-gap reference architecture using only transistors and resistors-no MOS gates-enabling low noise (50 μVRMS at VREF, 10 Hz–10 kHz), excellent long-term stability (20 ppm over 1000 hours), and robust ESD tolerance (2 kV HBM). Its 3-pin TO-92 configuration operates as a 2-terminal shunt device with cathode/anode/adjust terminals.
It functions within a 1.24 V to 5.30 V output range set by external resistor dividers, maintains regulation across 10 μA–20 mA load current, and exhibits 1 Ω dynamic impedance at 100 μA bias-critical for stable feedback in precision shunt regulator topologies like series-shunt or floating current detection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage Range | 1.24 V to 5.30 V - externally adjustable via two-resistor divider; enables flexible precision reference generation across common analog rails. |
| Initial Tolerance | ±2% - specified at 100 μA; ensures predictable accuracy without trimming in cost-sensitive production. |
| Temperature Coefficient | 50 ppm/°C - Y-suffix grade; limits reference drift to ±0.425 mV over −40°C to 85°C for 2.5 V nominal output. |
| Dynamic Impedance | 1 Ω - measured at 100 μA, 100 Hz; provides tight regulation under varying load conditions and suppresses ripple coupling. |
| Operating Current Range | 10 μA to 20 mA - supports ultra-low-power sensing (e.g., 10 μA battery monitoring) and higher-current shunt regulation (e.g., 20 mA precision clamps). |
| Output Noise | 50 μVRMS (10 Hz–10 kHz, VOUT = VREF) - low-noise performance suitable for high-resolution ADC references and sensitive analog front-ends. |
| Long-Term Stability | 20 ppm (1000 hr, 25°C) - minimal aging drift preserves calibration integrity in field-deployed instrumentation. |
Pinout & Package
LM285BYZ/NOPB uses a 3-pin TO-92 package (JEDEC TO-226, variation AA), with straight or formed leads, 5.34 mm max height, and RoHS-compliant Cu-Sn lead finish. The device is marked "LM285 BYZ" on the package body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Current sink return path | Completes shunt current loop; connects to system ground or negative rail in standard configurations. |
| Cathode (Pin 2) | Reference output node | Provides regulated voltage; connected to feedback divider and load; requires no external capacitor for stability. |
| Adjust (Pin 3) | Band-gap reference control terminal | Connects to resistor divider midpoint; sets output voltage per VOUT = VREF(1 + R1/R2); enables precise ratio-based adjustment. |
Key Features
| Feature | Design Value |
|---|---|
| Capacitive loading tolerance | Stable with any value of output capacitance-eliminates need for isolation resistors or stability analysis in layout. |
| Low quiescent current | 10 μA minimum operating current enables multi-year battery life in portable voltmeters and sensor nodes. |
| Tight dynamic impedance | 1 Ω impedance minimizes output voltage shift under load transients-critical for accurate current-source and clamp circuits. |
| Wide current operating range | 10 μA–20 mA span allows reuse across low-power monitoring and higher-current shunt regulation without redesign. |
| Hermetic-equivalent stability | Band-gap-only construction (no MOS elements) delivers low noise and long-term reliability comparable to ceramic-packaged references. |
Applications
| Precision 10V Reference | Low AC Noise Reference |
|---|---|
Use Scenario: Generating a stable 10 V reference for 16-bit SAR ADCs in portable data loggers. IC Role / Device Role / Timing Role: Shunt voltage reference providing high-accuracy, low-drift excitation for ADC reference input. Use Value: 50 ppm/°C tempco and 50 μVRMS noise ensure <0.01% full-scale error across operating temperature and signal bandwidth. | Use Scenario: Biasing low-noise op-amps in audio preamplifier gain stages. IC Role / Device Role / Timing Role: Low-noise DC reference source for amplifier offset nulling and common-mode setting. Use Value: 50 μVRMS wideband noise prevents audible hiss injection; 1 Ω impedance avoids interaction with op-amp input capacitance. |
| 25V Low Current Shunt Regulator | Voltage Level Detector |
Use Scenario: Providing regulated 25 V supply for high-impedance sensor interfaces in industrial IoT nodes. IC Role / Device Role / Timing Role: Adjustable shunt regulator configured with external resistors to deliver fixed 25 V output. Use Value: 10 μA–20 mA operating range supports microamp-level sensor biasing while maintaining regulation up to 25 V. | Use Scenario: Detecting battery voltage drop below 3.3 V threshold in lithium-ion powered medical wearables. IC Role / Device Role / Timing Role: Precision comparator reference node enabling accurate undervoltage lockout (UVLO) triggering. Use Value: ±2% initial tolerance and 50 ppm/°C drift ensure UVLO activation remains within ±30 mV over full temperature range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable shunt reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM285BXZ/NOPB | 1% initial tolerance (X-suffix), same TO-92 package and 30 ppm/°C tempco | Better accuracy-critical applications (e.g., calibration equipment), tighter thermal drift | Select when absolute output accuracy at 25°C is prioritized over cost; same pinout and layout. |
| TLVH431ACDBVR | 3-pin adjustable shunt regulator, 0.5% initial tolerance, 2.495 V nominal, SO-8 package | Higher accuracy and lower dropout, but requires minimum 80 μA cathode current and lacks capacitive loading immunity | Choose for higher-precision designs where board space permits SO-8 and layout can accommodate stability compensation. |
Compared with LM285BXZ/NOPB, LM285BYZ/NOPB trades 1% tolerance for lower cost and wider tempco margin; versus TLVH431ACDBVR, it offers superior capacitive loading tolerance and lower minimum operating current but with relaxed accuracy-making it optimal for cost-sensitive, battery-operated shunt reference roles.
Availability
LM285BYZ/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, battery-powered sensors, and industrial analog signal conditioning requiring stable component supply and long-lifecycle availability.
Supply support for LM285BYZ/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 company specializing in analog and embedded processing technologies, with leadership in precision analog ICs and power management solutions.
The LM285 series belongs to TI's micropower voltage reference product line, designed specifically for low-power, high-stability shunt reference applications in portable, battery-operated, and space-constrained systems.
FAQ
What is the maximum operating temperature for LM285BYZ/NOPB?
The LM285BYZ/NOPB is rated for operation from −40°C to +85°C ambient temperature. Its junction temperature limit is 125°C, and thermal resistance θJA is 440°C/W in the TO-92 package. Derating is required above 70°C ambient if power dissipation exceeds 100 mW-verified per TI's SNVS741F datasheet Table 1 and Thermal Characteristics section.
Does LM285BYZ/NOPB require an external capacitor for stability?
No, LM285BYZ/NOPB is explicitly designed to be tolerant of capacitive loading and remains stable with any value of output capacitance-no external capacitor is needed. This capability is confirmed in the "Features" section of the SNVS741F datasheet and eliminates stability concerns in layouts with PCB trace capacitance or bypass caps.
What does the 'Y' suffix indicate in LM285BYZ/NOPB?
The 'Y' suffix in LM285BYZ/NOPB denotes a 50 ppm/°C maximum average temperature coefficient, as specified in the Electrical Characteristics table of SNVS741F. This grade is distinct from the 'X' suffix (30 ppm/°C) and applies across the full −40°C to +85°C operating range, verified during production test.
Can LM285BYZ/NOPB be used as a 2.5 V reference?
Yes, LM285BYZ/NOPB can be configured as a 2.5 V reference using an external resistor divider network connected to its Adjust (Pin 3) and Cathode (Pin 2). The output is set by VOUT = VREF(1 + R1/R2), where VREF = 1.24 V minimum-enabling precise 2.5 V generation with appropriate resistor selection per Figure 6 in SNVS741F.
What is the minimum cathode current required for regulation in LM285BYZ/NOPB?
The minimum operating current for LM285BYZ/NOPB is 10 μA, specified at VOUT = VREF. This value is guaranteed across temperature and ensures stable regulation-confirmed in the Electrical Characteristics table under "Minimum Operating Current (max)" for LM285BY conditions. Below 10 μA, reference voltage may deviate beyond specification limits.
LM285BYZ/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA)
- Series:
- -
- Packaging:
- Tray
- 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:
- Through Hole
- Supplier Device Package:
- TO-92-3
LM285BYZ/NOPB FAQ
1.How can I place an order for LM285BYZ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM285BYZ/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/NOPB reliable?
The price and inventory of LM285BYZ/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/NOPB is usually 5 days.
3.What payment methods are accepted for LM285BYZ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM285BYZ/NOPB transactions.
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4.How is shipping managed for LM285BYZ/NOPB?
LM285BYZ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM285BYZ/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/NOPB?
For technical support, including LM285BYZ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM285BYZ/NOPB requirements.
6.How does Aetrix verify that LM285BYZ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM285BYZ/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/NOPB meets industry standards.
7.What is the process for return or replacement of LM285BYZ/NOPB?
All LM285BYZ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM285BYZ/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/NOPB part is unused and in its original packaging.
Return procedure for LM285BYZ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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