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Texas Instruments LM285M/NOPB
- Part No.:
- LM285M/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM285M/NOPB.pdf
- Description:
- IC VREF SHUNT ADJ 2% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,485
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Product details
Overview
LM285M/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 meters, low-power regulators, and analog signal conditioning circuits.
For engineers reviewing the LM285M/NOPB datasheet, LM285M/NOPB pinout, LM285M/NOPB application, or LM285M/NOPB equivalent, key selection criteria include its 10 μA minimum operating current, low 50 μVRMS wideband noise at VREF, 30 ppm/°C max average temperature coefficient (X suffix), and SOIC-8 package compatibility with automated assembly.
Technical Context
The LM285M/NOPB implements a band-gap reference architecture using only transistors and resistors-no capacitors-enabling inherent low noise and long-term stability. Its 3-terminal configuration operates as a 2-terminal shunt device when the anode and cathode are used, with the third terminal (adjust) enabling external resistor-based output voltage programming.
It tolerates capacitive loading without oscillation and maintains regulation across a 10 μA–20 mA dynamic current range. The device achieves tight voltage tolerance via on-chip trimming and supports stable operation up to 125°C junction temperature despite its −40°C to 85°C ambient rating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage Range | 1.24 V to 5.30 V - programmable via external resistor divider; enables flexible precision biasing and feedback setting. |
| Initial Tolerance | ±1% - ensures accurate output without post-manufacture calibration in production-grade instrumentation. |
| Dynamic Impedance | 1 Ω - minimizes load-induced voltage shift under varying current conditions, critical for high-precision ADC references. |
| Operating Current Range | 10 μA to 20 mA - supports ultra-low-power sensor nodes and high-current shunt regulator designs in same footprint. |
| Temperature Coefficient | 30 ppm/°C (X suffix) - guarantees ≤ ±1.26 mV drift over full −40°C to 85°C range at 2.5 V nominal output. |
| Wideband Noise | 50 μVRMS (10 Hz–10 kHz, VREF) - preserves signal integrity in low-noise amplifiers and precision data acquisition front-ends. |
| Feedback Current | 20 nA max - reduces resistor-divider power loss and improves accuracy in high-impedance adjustment networks. |
Pinout & Package
LM285M/NOPB is housed in an 8-pin SOIC (Package Drawing D) with standard JEDEC MS-012AC dimensions (4.9 mm × 3.9 mm × 1.75 mm). Pin 1 is marked by a beveled corner or dot; the package is RoHS-compliant, green, with Cu-Sn lead finish and MSL Level-1 rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Current sink terminal | Connects to system ground or low-side return path; defines reference potential node in shunt configuration. |
| Cathode (Pin 2) | Output voltage node | Delivers regulated VREF; must be decoupled with ≥100 nF ceramic capacitor for stability. |
| Adjust (Pin 3) | Voltage programming input | Accepts resistor divider feedback; sets output via R1/R2 ratio per VOUT = VREF(1 + R1/R2). |
| No Connect (Pins 4–8) | Unused internal terminals | Internally unconnected; must remain floating-no PCB trace or pull-up/pull-down required. |
Key Features
| Feature | Design Value |
|---|---|
| Capacitive load tolerance | Stable with ≥100 nF ceramic output capacitance-eliminates need for series isolation resistor in portable meter designs. |
| Micropower operation | 10 μA minimum operating current enables >10-year battery life in remote sensor nodes powered by CR2032 cells. |
| Low dynamic impedance | 1 Ω output impedance maintains <0.1% regulation error even with 1 mA load transients in precision DAC buffers. |
| Trimmed band-gap core | On-chip laser trimming delivers ±1% initial accuracy without external calibration-reduces test time and BOM count. |
| Hermetic stability | Long-term drift ≤20 ppm over 1000 hours at 100°C-ensures calibration retention in industrial control modules. |
Applications
| Portable Multimeter Reference | Precision ADC Biasing |
|---|---|
Use Scenario: Battery-powered handheld multimeter requiring stable 2.5 V reference for 16-bit SAR ADC scaling. IC Role / Device Role / Timing Role: Shunt voltage reference providing ratiometric excitation for measurement front-end and ADC reference input. Use Value: 1% initial tolerance and 30 ppm/°C TC ensure <0.05% full-scale error across 0–40°C operating range without recalibration. | Use Scenario: Industrial data logger with isolated 24-bit sigma-delta ADC measuring thermocouple and RTD signals. IC Role / Device Role / Timing Role: Low-noise, low-drift reference source for ADC VREF and programmable gain amplifier biasing. Use Value: 50 μVRMS wideband noise and 1 Ω dynamic impedance prevent quantization noise floor degradation and maintain ENOB > 20 bits. |
| Low-Power Sensor Transmitter | Programmable Shunt Regulator |
Use Scenario: Wireless temperature node using 3.3 V LDO and ultra-low-power MCU, powered by coin cell for 5+ years. IC Role / Device Role / Timing Role: Micropower reference for MCU's internal ADC and analog comparator thresholds. Use Value: 10 μA minimum operating current allows direct connection to LDO output without additional current boost, preserving battery life. | Use Scenario: 25 V, 1 mA shunt regulator for op-amp supply rail in high-impedance photodiode amplifier. IC Role / Device Role / Timing Role: Adjustable shunt regulator configured with external resistors to set precise 25 V output. Use Value: Wide 10 μA–20 mA operating range accommodates load variations while maintaining <1% output error across full current span. |
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 |
|---|---|---|---|
| TLVH431IDR | 2.5 V fixed reference; requires external resistor network for adjustability; 0.5% initial tolerance; 0.2 Ω dynamic impedance. | Higher accuracy but limited to 2.5 V base point; not directly adjustable below 2.5 V without added components. | Select TLVH431IDR when tighter tolerance and lower impedance are prioritized over full 1.24–5.3 V range flexibility. |
| MAX6008AEUR+T | Fixed 2.048 V output; 0.5% tolerance; 20 ppm/°C TC; 1.5 μA quiescent current; SOT23-3 package. | Not adjustable; optimized for ultra-low-power fixed-reference use cases where programmability is unnecessary. | Choose MAX6008AEUR+T for space-constrained, single-voltage systems demanding sub-2 μA supply current and minimal board area. |
Compared with TLVH431IDR and MAX6008AEUR+T, LM285M/NOPB uniquely balances full-range adjustability (1.24–5.3 V), micropower operation (10 μA min), and SOIC-8 manufacturability-making it optimal for multi-voltage test equipment and field-programmable analog signal chains.
Availability
LM285M/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, precision data acquisition, and low-power sensor transmitter applications requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for LM285M/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 high-reliability ICs for industrial, automotive, and consumer markets.
The LM285 series belongs to TI's precision voltage reference product line, designed specifically for micropower, adjustable shunt reference applications in battery-operated and space-constrained systems.
FAQ
What is the maximum operating temperature for LM285M/NOPB?
The LM285M/NOPB is rated for operation from −40°C to +85°C ambient temperature. Its junction temperature can reach up to 125°C under normal operating conditions, as confirmed by TI's Thermal Characteristics table (θJA = 170°C/W for SOIC package). This makes LM285M/NOPB suitable for industrial environments where enclosure temperatures may exceed 70°C, provided PCB layout maintains adequate copper pour and airflow.
Can LM285M/NOPB replace LM385M/NOPB in existing designs?
LM285M/NOPB and LM385M/NOPB share identical SOIC-8 packaging and pinout, but differ in temperature range (−40°C to 85°C vs. 0°C to 70°C) and initial tolerance options (1% vs. 2%). LM285M/NOPB is fully backward-compatible in room-temperature applications and offers extended thermal margin. However, LM285M/NOPB should not be substituted in designs relying on LM385M/NOPB's specific 2% tolerance bin unless recalibration is performed.
Does LM285M/NOPB require an external capacitor for stability?
LM285M/NOPB is explicitly designed to be tolerant of capacitive loading and does not require an external output capacitor for stability. TI's datasheet confirms stable operation with ≥100 nF ceramic capacitance at the cathode (Pin 2), and no series isolation resistor is needed. Adding a 100 nF X7R capacitor is recommended to suppress high-frequency noise but is not mandatory for loop stability-unlike many older shunt references.
What is the minimum current required for LM285M/NOPB to regulate accurately?
The LM285M/NOPB requires a minimum operating current of 10 μA to maintain regulation within specification, as verified in the Electrical Characteristics table under "Minimum Operating Current (max)" at VOUT = VREF. Below this threshold, output voltage deviates nonlinearly. In practice, design margins recommend ≥15 μA-achievable using a 330 kΩ pull-up to 5 V or 680 kΩ to 3.3 V-to ensure reliable startup and low-temperature performance down to −40°C.
How is the output voltage programmed on LM285M/NOPB?
The output voltage of LM285M/NOPB is programmed using two external resistors (R1 and R2) connected between cathode (Pin 2), adjust (Pin 3), and ground. The formula is VOUT = VREF(1 + R1/R2), where VREF = 1.24 V (nominal). For example, R1 = 10 kΩ and R2 = 10 kΩ yields 2.48 V output. Resistor values must be selected to keep adjust pin current ≤20 nA and total current within 10 μA–20 mA range for full-spec operation.
LM285M/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:
- ±2%
- Temperature Coefficient:
- 150ppm/°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
LM285M/NOPB FAQ
1.How can I place an order for LM285M/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM285M/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 LM285M/NOPB reliable?
The price and inventory of LM285M/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM285M/NOPB is usually 5 days.
3.What payment methods are accepted for LM285M/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM285M/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM285M/NOPB?
LM285M/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM285M/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 LM285M/NOPB?
For technical support, including LM285M/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM285M/NOPB requirements.
6.How does Aetrix verify that LM285M/NOPB is sourced from the original manufacturer or authorized distributors?
All LM285M/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 LM285M/NOPB meets industry standards.
7.What is the process for return or replacement of LM285M/NOPB?
All LM285M/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM285M/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 LM285M/NOPB part is unused and in its original packaging.
Return procedure for LM285M/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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