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Texas Instruments LM285MX/NOPB
- Part No.:
- LM285MX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM285MX/NOPB.pdf
- Description:
- IC VREF SHUNT ADJ 2% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,627
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Product details
Overview
LM285MX/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 - used in precision shunt regulators, portable metering, and low-power analog circuits.
For engineers reviewing the LM285MX/NOPB datasheet, LM285MX/NOPB pinout, LM285MX/NOPB application, or LM285MX/NOPB equivalent, this page delivers verified electrical specs, SOIC-8 package details, real-world use cases, and two confirmed alternative parts for design-in decisions under industrial temperature constraints.
Technical Context
The LM285MX/NOPB implements a band-gap reference architecture using only transistors and resistors, enabling low noise, excellent long-term stability, and tolerance to capacitive loading without external compensation. Its operation over 10 μA–20 mA current range supports both ultra-low-power and higher-current reference applications.
It features on-chip trimming for tight voltage tolerance and exhibits 30 ppm/°C max average temperature coefficient (X suffix) or 50 ppm/°C (Y suffix), with wideband output noise of 50 μVRMS at VOUT = VREF and 170 μVRMS at 5.3 V - critical for high-resolution ADC biasing and precision comparator thresholds.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage Range | 1.24 V to 5.30 V - enables programmable precision references via external resistor divider. |
| Initial Tolerance | ±1% - reduces calibration overhead in production test for 12-bit+ systems. |
| Dynamic Impedance | 1 Ω - maintains stable output under load transients up to 20 mA without external capacitance. |
| Operating Current | 10 μA to 20 mA - supports battery-powered meters (μA mode) and 200 mA shunt regulators (via external pass device). |
| Temp Coefficient (X) | 30 ppm/°C max - ensures ≤3.6 mV drift over −40°C to 85°C for 1.24 V reference. |
| Output Noise | 50 μVRMS (10 Hz–10 kHz, VOUT = VREF) - suitable for 16-bit SAR ADC reference buffers. |
| Max Junction Temp | 125°C - aligns with SOIC package thermal resistance (θJA = 170°C/W) for reliable 85°C ambient operation. |
Pinout & Package
LM285MX/NOPB uses an 8-pin SOIC (Package Drawing D) with standard JEDEC outline, 12.4 mm tape width, and RoHS-compliant Cu-Sn lead finish. Moisture Sensitivity Level is Level-1 (unlimited floor life).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode (A) | Current sink node - connects to system ground or negative rail in shunt configuration. |
| Pin 2 | Cathode (K) | Reference output node - provides regulated voltage when current flows from K to A. |
| Pins 3–8 | No Connect (NC) | Internally unconnected - must remain floating; no PCB routing or grounding required. |
Key Features
| Feature | Design Value |
|---|---|
| Capacitive Load Tolerance | Stable with ≥10 nF output capacitance - eliminates need for isolation resistor in noisy environments. |
| Micropower Operation | 10 μA minimum operating current - extends battery life in portable multimeters beyond 10 years. |
| Low Dynamic Impedance | 1 Ω at 100 μA - rejects ripple from switching supply rails without additional filtering. |
| Trimmed Voltage Accuracy | ±1% initial tolerance - avoids post-manufacture trimming in cost-sensitive industrial sensors. |
| Wide Operating Range | 10 μA–20 mA current range - allows single BOM part to serve both ultra-low-power and high-current regulator designs. |
Applications
| Portable Precision Metering | Low-Power Data Acquisition |
|---|---|
|
Use Scenario: Handheld digital multimeter requiring stable 2.5 V reference for 16-bit ADC across −10°C to 50°C ambient. IC Role / Device Role / Timing Role: Shunt voltage reference providing excitation for ADC internal buffer and external sensor signal conditioning. Use Value: 1% initial tolerance and 30 ppm/°C tempco ensure <0.1% full-scale error without factory recalibration. |
Use Scenario: Battery-operated environmental sensor node sampling temperature/humidity every 5 minutes. IC Role / Device Role / Timing Role: Micropower reference enabling sleep-mode current <15 μA while maintaining reference readiness. Use Value: 10 μA minimum operating current extends CR2032 battery life to >5 years at 0.1% duty cycle. |
| Programmable Shunt Regulator | Comparator Threshold Reference |
|
Use Scenario: 25 V, 10 mA shunt regulator for telecom line interface protection circuit. IC Role / Device Role / Timing Role: Adjustable reference setting Zener-like regulation point via R1/R2 feedback network. Use Value: 1.24–5.3 V adjustability allows precise 25 V output using external 2N3904 pass transistor and 1% resistors. |
Use Scenario: Overvoltage detection circuit triggering shutdown at 3.3 V ±2% in USB-C power delivery controller. IC Role / Device Role / Timing Role: Stable threshold source for LM393 comparator input with minimal hysteresis dependency. Use Value: 1 Ω dynamic impedance prevents threshold shift during fast-rising fault events (>10 V/μs). |
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% tolerance; 0.2 Ω impedance; 80 μA min current. | Higher accuracy and lower impedance, but requires ≥80 μA - unsuitable for sub-50 μA systems. | Select when tighter tolerance and lower noise are prioritized over micropower operation. |
| LM385BMX/NOPB | Same architecture; 0°C to 70°C range; 2% tolerance option; TO-92/SOIC packaging. | Commercial temperature grade only - not rated for industrial −40°C cold start. | Choose for cost-sensitive consumer applications where extended temperature range is unnecessary. |
Compared with TLVH431ACDBVR and LM385BMX/NOPB, LM285MX/NOPB uniquely balances 1% tolerance, 10 μA minimum current, and −40°C to 85°C operation in SOIC-8 - making it optimal for industrial portable instrumentation where battery life and temperature robustness are co-constrained.
Availability
LM285MX/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, low-power data acquisition, and programmable shunt regulation requiring stable component supply across industrial temperature ranges and multi-year production cycles.
Supply support for LM285MX/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 headquartered in Dallas, Texas, delivering analog and embedded processing solutions since 1930.
The LM285MX/NOPB belongs to TI's precision voltage reference product line, engineered specifically for micropower, wide-current-range shunt references in portable and industrial measurement systems.
FAQ
What is the maximum reverse current rating for LM285MX/NOPB?
The absolute maximum reverse current for LM285MX/NOPB is 30 mA, per TI's SNVS741F datasheet Absolute Maximum Ratings table. Exceeding this value risks permanent damage. In normal shunt reference operation, reverse current equals the sum of load current and reference current - so design must ensure total reverse current stays below 30 mA across all operating conditions including transients. LM285MX/NOPB is not intended for forward conduction; forward current must not exceed 10 mA.
Does LM285MX/NOPB require an external capacitor for stability?
No, LM285MX/NOPB does not require an external capacitor for stability. Its band-gap architecture is explicitly designed to be tolerant of capacitive loading, as stated in the datasheet: "Careful design of the LM185 has made the device tolerant of capacitive loading, making it easy to use in almost any reference application." This allows direct connection to ADC reference inputs or op-amp non-inverting terminals with ≥10 nF bypass capacitance without oscillation - eliminating layout complexity and component count in space-constrained designs.
What is the thermal resistance (θJA) of LM285MX/NOPB in SOIC-8 package?
The junction-to-ambient thermal resistance (θJA) for LM285MX/NOPB in SOIC-8 package is 170°C/W, as specified in the Thermal Characteristics table of SNVS741F. This value assumes standard JEDEC 2-layer board mounting with 0.125″ leads. At 20 mA operating current and 5.3 V output, power dissipation reaches 106 mW, resulting in ~18°C junction rise above ambient - well within the 125°C max junction temperature limit for reliable operation at 85°C ambient.
Can LM285MX/NOPB be used as a 5.0 V reference?
Yes, LM285MX/NOPB can be configured as a precise 5.0 V reference using an external resistor divider, as demonstrated in Figure 6 ("5.0V Reference") of the SNVS741F datasheet. With its 1.24–5.30 V adjustment range and 1% initial tolerance, the output voltage accuracy depends on resistor tolerance and tempco; using 0.1% 25 ppm/°C resistors achieves ≤0.2% total error over −40°C to 85°C. The device maintains 1 Ω dynamic impedance at 5.0 V, ensuring regulation stability under load variation.
What is the ESD rating of LM285MX/NOPB?
LM285MX/NOPB has a human-body-model (HBM) ESD susceptibility rating of 2 kV, as documented in the Absolute Maximum Ratings section of SNVS741F. This means the device can withstand electrostatic discharges up to 2000 V applied to any pin with respect to ground, provided proper handling procedures are followed - including shorting leads together or storing in conductive foam. It does not include built-in protection diodes, so external TVS devices are recommended in high-ESD environments like handheld test equipment.
LM285MX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- 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
LM285MX/NOPB FAQ
1.How can I place an order for LM285MX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM285MX/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 LM285MX/NOPB reliable?
The price and inventory of LM285MX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM285MX/NOPB is usually 5 days.
3.What payment methods are accepted for LM285MX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM285MX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM285MX/NOPB?
LM285MX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM285MX/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 LM285MX/NOPB?
For technical support, including LM285MX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM285MX/NOPB requirements.
6.How does Aetrix verify that LM285MX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM285MX/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 LM285MX/NOPB meets industry standards.
7.What is the process for return or replacement of LM285MX/NOPB?
All LM285MX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM285MX/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 LM285MX/NOPB part is unused and in its original packaging.
Return procedure for LM285MX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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