My Inquiry
My Account
Texas Instruments LM285Z/NOPB
- Part No.:
- LM285Z/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-226-3, TO-92-3 (TO-226AA)
- Datasheet:
-
LM285Z/NOPB.pdf
- Description:
- IC VREF SHUNT ADJ 2% TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,407
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM285Z/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 LM285Z/NOPB datasheet, LM285Z/NOPB pinout, LM285Z/NOPB application, or LM285Z/NOPB equivalent, key selection criteria include its micropower operation (10 μA min), low temperature coefficient (30 ppm/°C max for Y-grade), TO-92 package compatibility, and shunt-mode reference architecture requiring external resistor programming.
Technical Context
The LM285Z/NOPB implements a band-gap reference core using only transistors and resistors, enabling low noise (50 μVrms wideband noise at VREF) and long-term stability (20 ppm typical drift over 1000 hours). Its two-terminal shunt topology functions as a programmable voltage sink, regulating output by adjusting current through an external series resistor.
It operates across a 10 μA–20 mA dynamic current range, tolerates capacitive loading without instability, and delivers stable reference voltage despite supply variations - making it suitable for battery-powered systems where quiescent current and thermal drift are critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage Range | 1.24 V to 5.30 V - set externally via resistor divider; enables flexible precision biasing in analog signal chains. |
| Initial Tolerance | ±1% - ensures accurate voltage setting without post-manufacture calibration in production systems. |
| Dynamic Impedance | 1 Ω - minimizes output voltage variation under load transients, critical for high-accuracy ADC references. |
| Operating Current Range | 10 μA to 20 mA - supports ultra-low-power sensor nodes and higher-current shunt regulation up to 200 mA with external pass device. |
| Temperature Coefficient | 30 ppm/°C (max, Y-grade) - limits reference drift to ±2.5 mV over −40°C to 85°C for 2.5 V setpoint. |
| Wideband Noise | 50 μVrms (10 Hz–10 kHz, VREF) - preserves signal integrity in precision instrumentation amplifiers and low-noise DACs. |
| Minimum Operating Current | 10 μA - enables operation from coin-cell batteries for >10-year shelf-life applications. |
Pinout & Package
LM285Z/NOPB uses a 3-pin TO-92 plastic package (JEDEC TO-226AA), 5.34 mm maximum height, with straight or formed leads. Thermal resistance θJA = 440°C/W (0.4″ leads).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Current Sink Input | Connects to system ground or negative rail; defines reference return path and sets current direction. |
| Cathode (Pin 2) | Output Reference Terminal | Provides regulated voltage node; connects to feedback divider or load; requires external resistor to input supply. |
| NC / Case (Pin 3) | Package Tab / Mechanical Ground | No internal connection; electrically isolated; serves as mechanical mounting point and thermal path to PCB copper. |
Key Features
| Feature | Design Value |
|---|---|
| Capacitive Load Tolerance | Stable with ≥10 nF output capacitance - eliminates need for external compensation in battery-monitoring circuits. |
| Micropower Operation | 10 μA minimum operating current - extends coin-cell life beyond 5 years in wireless sensor transmitters. |
| Low Dynamic Impedance | 1 Ω at 100 μA - maintains <1 mV error during 1 mA load steps in precision current-source designs. |
| Band-Gap Core Architecture | Transistor/resistor-only design - achieves 20 ppm/1000 hr long-term stability without laser trimming drift mechanisms. |
| ESD Robustness | 2 kV HBM rating - survives handling in non-ESD-controlled assembly environments without additional protection. |
Applications
| Battery-Powered Precision Metering | Low-Noise Data Acquisition |
|---|---|
Use Scenario: Handheld multimeter measuring 0–200 mV DC with 0.1% accuracy over 0–50°C ambient. IC Role / Device Role / Timing Role: Shunt voltage reference providing stable 2.5 V reference for 16-bit SAR ADC and front-end amplifier biasing. Use Value: 1% initial tolerance and 30 ppm/°C TC ensure full-scale error remains within specification without auto-zero or calibration routines. | Use Scenario: Industrial temperature sensor node sampling thermocouple outputs at 10 SPS with 100 dB SNR requirement. IC Role / Device Role / Timing Role: Low-noise 1.24 V reference for instrumentation amplifier gain-setting and ADC reference input. Use Value: 50 μVrms wideband noise prevents degradation of effective resolution below 16 bits in 24-bit sigma-delta converter front ends. |
| Programmable Shunt Regulator | Portable Medical Sensor Biasing |
Use Scenario: 25 V, 5 mA shunt regulator for op-amp power rail conditioning in portable ECG front end. IC Role / Device Role / Timing Role: Adjustable shunt reference configured with external resistor to clamp output at precise 25 V. Use Value: 20 mA max operating current supports direct drive of 25 V/5 mA loads; 1 Ω dynamic impedance holds regulation within ±5 mV during line transients. | Use Scenario: Wearable pulse oximeter using photodiode array with transimpedance amplifiers requiring stable 3.3 V bias. IC Role / Device Role / Timing Role: Micropower reference generating 3.3 V from 3.6 V Li-ion cell via resistor divider and external transistor. Use Value: 10 μA minimum current enables continuous operation during sleep mode; TO-92 package fits compact flex PCB layouts. |
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 | 3-pin adjustable shunt regulator; 1.24 V–18 V range; 2% tolerance; 0.2 Ω dynamic impedance; SO-8 package. | Higher current capability (up to 100 mA); lower impedance; but requires minimum 80 μA cathode current. | Select when higher output current or tighter dynamic regulation is needed; not suitable for sub-50 μA systems. |
| LM385Z-2.5/NOPB | Fixed 2.5 V output; same TO-92 package; 2% tolerance; −40°C to 85°C; 10 μA–20 mA range. | Eliminates external resistor network; reduces BOM count; but lacks voltage adjustability. | Select when fixed 2.5 V reference suffices and board space is constrained; identical thermal and footprint compatibility. |
Compared with TLVH431ACDBVR and LM385Z-2.5/NOPB, the LM285Z/NOPB uniquely balances ultra-low quiescent current (10 μA), adjustable output (1.24–5.3 V), and TO-92 compatibility - making it optimal for cost-sensitive, battery-constrained designs where flexibility and micropower coexist.
Availability
LM285Z/NOPB is available at Aetrix Electronics and suitable for precision shunt regulation, portable instrumentation, and low-power analog biasing requiring stable component supply across industrial, medical, and test equipment programs.
Supply support for LM285Z/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 battery-operated and energy-constrained systems requiring stable, low-drift, adjustable reference voltages without external compensation.
FAQ
What is the minimum operating current required for stable regulation in LM285Z/NOPB?
The LM285Z/NOPB requires a minimum operating current of 10 μA to maintain regulation within specifications. Below this threshold, reference voltage accuracy degrades significantly; datasheet curves confirm stable behavior begins precisely at 10 μA across the full −40°C to 85°C range. This value is critical for designing coin-cell-powered devices where LM285Z/NOPB enables multi-year operation.
Can LM285Z/NOPB be used as a 5.0 V reference, and what external resistor is needed?
Yes, LM285Z/NOPB can be configured as a 5.0 V reference using an external resistor network per Figure 6 in the datasheet. With a 5.0 V output and 100 μA operating current, a 47.5 kΩ resistor from input to cathode is required. The LM285Z/NOPB's 1.24–5.30 V range and 1% tolerance ensure 5.0 V accuracy without trimming, provided the external resistor has ≤0.1% tolerance and low TCR.
Does LM285Z/NOPB require output capacitance for stability, and if so, what value?
No, LM285Z/NOPB does not require output capacitance for stability - its band-gap core is inherently tolerant of capacitive loading up to at least 100 nF, as confirmed in the "Capacitive Loading" section of the datasheet. Adding capacitance (e.g., 10 nF ceramic) improves noise rejection but introduces no phase margin risk. This simplifies layout in space-constrained LM285Z/NOPB applications like wearable sensors.
What is the thermal resistance (θJA) of LM285Z/NOPB in its TO-92 package?
The LM285Z/NOPB in TO-92 package has a junction-to-ambient thermal resistance (θJA) of 440°C/W with 0.4″ lead length, per TI's thermal characteristics table. This value assumes standard JEDEC test conditions; actual performance improves with PCB copper pour under the tab (Pin 3). For continuous 20 mA operation at 85°C ambient, junction temperature stays below 125°C - within the LM285Z/NOPB's rated limit.
How does the temperature coefficient of LM285Z/NOPB compare to LM285BYZ/NOPB?
The LM285Z/NOPB carries no temperature coefficient grade suffix (X/Y), indicating it meets the standard 150 ppm/°C max spec. In contrast, LM285BYZ/NOPB is Y-grade with 50 ppm/°C max. Both share identical TO-92 packaging and electrical pinout, but LM285Z/NOPB is selected for cost-sensitive applications where moderate drift is acceptable - whereas LM285BYZ/NOPB targets higher-precision LM285Z/NOPB deployments needing tighter thermal stability.
LM285Z/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA)
- Series:
- -
- Packaging:
- Bulk
- 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:
- Through Hole
- Supplier Device Package:
- TO-92-3
LM285Z/NOPB FAQ
1.How can I place an order for LM285Z/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM285Z/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 LM285Z/NOPB reliable?
The price and inventory of LM285Z/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM285Z/NOPB is usually 5 days.
3.What payment methods are accepted for LM285Z/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM285Z/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM285Z/NOPB?
LM285Z/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM285Z/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 LM285Z/NOPB?
For technical support, including LM285Z/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM285Z/NOPB requirements.
6.How does Aetrix verify that LM285Z/NOPB is sourced from the original manufacturer or authorized distributors?
All LM285Z/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 LM285Z/NOPB meets industry standards.
7.What is the process for return or replacement of LM285Z/NOPB?
All LM285Z/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM285Z/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 LM285Z/NOPB part is unused and in its original packaging.
Return procedure for LM285Z/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM285Z/NOPB Tags
-
TL431AIDBZR
Texas Instruments
-
TL431BQDBZR
Texas Instruments
-
AN431AN-ATRG1
Diodes Incorporated
-
LM4040CYM3-2.5-TR
Microchip Technology
-
LM4040CYM3-4.1-TR
Microchip Technology
-
LM4040EIM3-2.5/NOPB
Texas Instruments
-
AZ431LBNTR-G1
Diodes Incorporated
-
LM4040D20IDBZR
Texas Instruments
-
LM4041DIM3-ADJ/NOPB
Texas Instruments
-
LM4040DIM3X-2.5/NOPB
Texas Instruments
-
LM4040DIM3-2.5/NOPB
Texas Instruments
-
AZ431LANTR-G1
Diodes Incorporated
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
