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Texas Instruments LM285BYM/NOPB
- Part No.:
- LM285BYM/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM285BYM/NOPB.pdf
- Description:
- IC VREF SHUNT ADJ 1% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:210
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Product details
Overview
LM285BYM/NOPB from Texas Instruments is a 3-terminal adjustable band-gap shunt voltage reference IC operating from 1.24 V to 5.30 V with 1% initial tolerance, 50 ppm/°C max temperature coefficient, and 1 Ω dynamic impedance. It delivers stable precision reference voltage in battery-powered meters, low-power regulators, and analog signal conditioning circuits across −40°C to 85°C.
For engineers reviewing the LM285BYM/NOPB datasheet, LM285BYM/NOPB pinout, LM285BYM/NOPB application, or LM285BYM/NOPB equivalent, key selection considerations include its SOIC-8 package, 10 μA to 20 mA operating current range, low wideband noise (50 μVrms at VREF), and compatibility with capacitive loads without instability.
Technical Context
The LM285BYM/NOPB implements a band-gap reference core using only transistors and resistors-enabling low noise, excellent long-term stability, and tolerance to capacitive loading. Its feedback current is ≤25 nA (max), supporting high-impedance setpoint networks.
It operates as a 2-terminal shunt device configured as a 3-pin adjustable reference: cathode, anode, and adjust (ADJ) terminal. The ADJ pin enables precise external resistor ratio programming of output voltage within 1.24–5.30 V, with regulation maintained over 10 μA–20 mA load current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage Range | 1.24 V to 5.30 V - Programmable via external resistor divider on ADJ pin for flexible system-level voltage scaling. |
| Initial Tolerance | ±1% - Tight factory trimming ensures accurate setpoint without calibration in production systems. |
| Temp Coefficient | 50 ppm/°C max - Enables stable reference performance across industrial temperature range (−40°C to 85°C). |
| Dynamic Impedance | 1 Ω - Minimizes output voltage shift under dynamic load transients, critical for ADC reference and precision op-amp biasing. |
| Operating Current | 10 μA to 20 mA - Supports ultra-low-power sensor nodes and higher-current shunt regulator configurations. |
| Output Noise | 50 μVrms (10 Hz–10 kHz, VOUT = VREF) - Low noise preserves signal integrity in high-resolution data acquisition paths. |
| Feedback Current | 25 nA max - Allows use with high-value resistors (>1 MΩ) in voltage-divider networks without significant error. |
Pinout & Package
LM285BYM/NOPB is housed in an 8-pin SOIC (Package Drawing D) with standard JEDEC MS-012AC footprint, 1.27 mm pitch, and moisture sensitivity level (MSL) 1 (260°C peak reflow). Thermal resistance θJA is 170°C/W (0.125″ leads).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Pin 1) | Reference Output / High-Side Connection | Connects to regulated voltage node; sinks current to maintain VREF at ADJ pin; requires series resistor from supply. |
| Anode (Pin 2) | Ground Reference / Return Path | Low-impedance return for reference current; must be tied directly to system ground plane for stability. |
| ADJ (Pin 3) | Adjust Terminal / Feedback Input | High-impedance input sensing divided-down output; sets VOUT = VREF × (1 + R1/R2) with external resistors. |
| No Connect (Pins 4–8) | Unused Internal Terminals | Internally unconnected; must remain floating per TI design-no external tie or bypass required. |
Key Features
| Feature | Design Value |
|---|---|
| Capacitive Load Tolerance | Stable with ≥1 μF ceramic output capacitance-eliminates need for external compensation in portable meter designs. |
| Micropower Operation | 10 μA minimum operating current enables multi-year battery life in remote IoT sensors and handheld test equipment. |
| Band-Gap Core Architecture | Transistor/resistor-only topology ensures <10 ppm/√kHz noise floor and <50 ppm/1000 hr long-term drift. |
| Wide Supply Headroom | Operates with up to 5.3 V headroom above VREF-supports direct use with 5 V or 3.3 V rails without pre-regulation. |
| ESD Robustness | 2 kV HBM rating-survives handling in standard assembly environments without special ESD protocols. |
Applications
| Portable Multimeter Reference | Precision ADC Biasing |
|---|---|
Use Scenario: Battery-powered handheld multimeter requiring stable 2.5 V reference for 16-bit SAR ADC over 0–40°C ambient. IC Role / Device Role / Timing Role: Shunt voltage reference providing excitation for ADC internal reference buffer and analog front-end gain stages. Use Value: 1% initial tolerance and 50 ppm/°C TC ensure full-scale accuracy remains within ±0.1% across operating temperature without calibration. | Use Scenario: Industrial data logger sampling thermocouple signals at 10 kSPS with 24-bit delta-sigma ADC. IC Role / Device Role / Timing Role: Low-noise, low-drift reference source for ADC reference input and programmable gain amplifier offset nulling. Use Value: 50 μVrms wideband noise prevents degradation of effective number of bits (ENOB) below 21.5 bits at 10 kSPS. |
| Low-Power Sensor Transmitter | Programmable Shunt Regulator |
Use Scenario: Wireless pressure sensor node powered by CR2032 coin cell, transmitting every 5 minutes via BLE. IC Role / Device Role / Timing Role: Micropower voltage reference establishing stable bias for op-amp signal conditioning and ADC reference before transmission burst. Use Value: 10 μA minimum operating current extends battery life beyond 5 years while maintaining 1.24–5.30 V programmability for sensor full-scale scaling. | Use Scenario: 25 V, 1 mA shunt regulator for isolated auxiliary supply in PLC I/O module. IC Role / Device Role / Timing Role: Adjustable shunt reference configured with external resistor to clamp output at precise 25 V threshold. Use Value: 1 Ω dynamic impedance ensures <25 mV droop under 1 mA load step, meeting IEC 61000-4-5 surge immunity requirements. |
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 |
|---|---|---|---|
| TLVH431AIDBZR | 2.5 V fixed or adjustable (2.5–36 V); 0.5% initial tolerance; 90 ppm/°C TC; 0.2 Ω dynamic impedance; 80 μA min current. | Higher accuracy and lower impedance but requires ≥80 μA operating current-unsuitable for sub-50 μA micropower designs. | Select when tighter tolerance and lower impedance outweigh micropower needs; verify PCB layout supports higher quiescent current path. |
| MAX6126AASA+ | 2.5 V fixed; 0.04% initial tolerance; 3 ppm/°C TC; 10 μVrms noise; 100 μA operating current; SO-8 package. | Ultra-high precision and ultra-low drift, but fixed output and higher power-used in metrology-grade instruments, not general-purpose adjustment. | Choose only for calibration-grade references where 1% tolerance is insufficient; not drop-in due to fixed VREF and higher current demand. |
Compared with TLVH431AIDBZR and MAX6126AASA+, the LM285BYM/NOPB uniquely balances 1% tolerance, 50 ppm/°C TC, and true micropower operation (10 μA min) in a cost-optimized SOIC-8 package-making it optimal for industrial sensors and portable instrumentation where power and programmability are primary constraints.
Availability
LM285BYM/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, industrial sensor interfaces, and low-power analog signal conditioning requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LM285BYM/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 delivering analog, embedded processing, and logic solutions for industrial, automotive, and consumer applications.
The LM285 series belongs to TI's precision voltage reference product line, engineered specifically for micropower, adjustable shunt reference applications in battery-operated and space-constrained systems.
FAQ
What is the maximum output voltage achievable with LM285BYM/NOPB?
The LM285BYM/NOPB supports an adjustable reference voltage range from 1.24 V to 5.30 V. This upper limit is defined by internal band-gap core headroom and is confirmed in the Electrical Characteristics table under "Reference Voltage" conditions at 20 mA load. Exceeding 5.30 V risks regulation loss and increased temperature coefficient deviation. The LM285BYM/NOPB achieves this range using only two external resistors on the ADJ pin.
Does LM285BYM/NOPB require an external capacitor for stability?
No, the LM285BYM/NOPB is explicitly designed to be tolerant of capacitive loading-including ≥1 μF ceramic output capacitance-without oscillation or phase margin degradation. This eliminates the need for external stabilization capacitors in most applications, simplifying layout and reducing BOM count. Stability is maintained across the full 10 μA–20 mA operating current range and −40°C to 85°C temperature span.
Can LM285BYM/NOPB replace LM385BM/NOPB in existing designs?
Yes, the LM285BYM/NOPB can replace LM385BM/NOPB in most SOIC-8 designs, but with key differences: LM285BYM/NOPB offers 1% initial tolerance and −40°C to 85°C operation, whereas LM385BM/NOPB has 2% tolerance and 0°C to 70°C range. Both share identical SOIC-8 package, pinout, and electrical interface. Verify thermal derating and tolerance budget in your application before substitution.
What is the purpose of Pins 4–8 on LM285BYM/NOPB?
Pins 4–8 of the LM285BYM/NOPB are internally unconnected (No Connect) terminals. They serve no functional role in the device's operation and must remain electrically floating-neither tied to ground nor bypassed. This configuration is confirmed in TI's official package drawing D and electrical schematics. Connecting these pins may compromise performance or reliability.
How does the feedback current specification impact resistor selection for LM285BYM/NOPB?
The LM285BYM/NOPB has a maximum feedback current of 25 nA at the ADJ pin. This low value allows use of high-resistance divider networks-e.g., 1 MΩ and 2.49 MΩ for 5.0 V output-without introducing >0.1% error from current injection. Selecting resistors >100 kΩ avoids significant voltage division error while minimizing power consumption, making the LM285BYM/NOPB ideal for ultra-low-power systems.
LM285BYM/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tube
- 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
LM285BYM/NOPB FAQ
1.How can I place an order for LM285BYM/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM285BYM/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 LM285BYM/NOPB reliable?
The price and inventory of LM285BYM/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM285BYM/NOPB is usually 5 days.
3.What payment methods are accepted for LM285BYM/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM285BYM/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM285BYM/NOPB?
LM285BYM/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM285BYM/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 LM285BYM/NOPB?
For technical support, including LM285BYM/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM285BYM/NOPB requirements.
6.How does Aetrix verify that LM285BYM/NOPB is sourced from the original manufacturer or authorized distributors?
All LM285BYM/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 LM285BYM/NOPB meets industry standards.
7.What is the process for return or replacement of LM285BYM/NOPB?
All LM285BYM/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM285BYM/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 LM285BYM/NOPB part is unused and in its original packaging.
Return procedure for LM285BYM/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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