My Inquiry
My Account
Texas Instruments LM385BM-2.5/NOPB
- Part No.:
- LM385BM-2.5/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM385BM-2.5/NOPB.pdf
- Description:
- IC VREF SHUNT 1.5% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:460
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM385BM-2.5/NOPB from Texas Instruments is a micropower 2-terminal band-gap voltage reference delivering a precise 2.5 V output with ±20 mV (±0.8%) initial tolerance, 0.6 Ω dynamic impedance, and operation over 20 μA–20 mA current range. It serves as a stable reference in portable meters, battery-powered analog circuits, and precision current sources where low quiescent current and temperature stability are critical.
For engineers reviewing the LM385BM-2.5/NOPB datasheet, LM385BM-2.5/NOPB pinout, LM385BM-2.5/NOPB application, or LM385BM-2.5/NOPB equivalent, key selection considerations include its SOIC-8 package, 0°C to 70°C operating temperature range, ±0.8% initial accuracy, low 120 μVrms wideband noise, and compatibility with capacitive loads up to 10 μF without instability.
Technical Context
The LM385BM-2.5/NOPB uses on-chip trimming for tight voltage tolerance and relies solely on transistors and resistors-enabling low noise and excellent long-term stability. Its band-gap architecture ensures predictable temperature behavior across its specified range.
It operates as a 2-terminal device requiring only external current limiting, with reverse breakdown voltage tightly regulated at 2.500 V (min 2.480 V, max 2.520 V) at 100 μA. Dynamic impedance remains ≤0.6 Ω at 20 Hz, supporting stable regulation under varying load conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.500 V ±20 mV (±0.8%) at 100 μA - enables precision ADC/DAC biasing and calibration references |
| Operating Current Range | 20 μA to 20 mA - supports ultra-low-power sensor nodes and high-current reference buffering |
| Dynamic Impedance | ≤0.6 Ω at 20 Hz - maintains regulation stability with capacitive loads up to 10 μF |
| Temperature Coefficient | 150 ppm/°C (max) - ensures <±1.5 mV drift over 0°C to 70°C operating range |
| Wideband Noise (10 Hz–10 kHz) | 120 μVrms - minimizes added noise in high-resolution measurement front-ends |
| Long-Term Stability | 20 ppm (1000 hr @ 25°C) - supports reliable performance in unattended instrumentation |
Pinout & Package
LM385BM-2.5/NOPB is housed in an 8-pin SOIC package (Package Drawing D0008A), 1.75 mm maximum height, RoHS-compliant with Sn finish. Pin 1 is index-marked; pins 1–4 and 5–8 form two symmetrical rows.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode (Input) | Current source connection - requires series resistor to set operating current |
| Pin 2 | Cathode (Output) | Stable 2.5 V reference node - connects directly to load or feedback network |
| Pins 3–8 | No Connect / Internally Unused | Not bonded - electrically isolated; no external connection required or recommended |
Key Features
| Feature | Design Value |
|---|---|
| Capacitive Load Tolerance | Stable with ≥10 μF output capacitance - eliminates need for external isolation components in battery-powered designs |
| Micropower Operation | 20 μA minimum operating current - extends shelf-life-equivalent battery life in portable meters |
| Tight Initial Accuracy | ±0.8% (±20 mV) - reduces or eliminates system-level trimming in production test |
| Low Dynamic Impedance | 0.6 Ω - maintains regulation during transient load steps in precision current sources |
| Hermetic Alternative Available | LM185-2.5-N offers −55°C to +125°C and TO package - for extended industrial/military use |
Applications
| Portable Digital Multimeters | Low-Power Data Acquisition Systems |
|---|---|
Use Scenario: Battery-powered handheld DMM requiring stable reference for 16-bit ADC conversion over 0–70°C ambient. IC Role / Device Role / Timing Role: Primary 2.5 V reference for ADC voltage scaling and offset calibration. Use Value: 20 μA minimum operating current enables >1-year battery life; ±0.8% tolerance avoids factory calibration per unit. | Use Scenario: Remote environmental sensor node powered by coin cell, sampling temperature/humidity every 5 minutes. IC Role / Device Role / Timing Role: Reference for precision ratiometric sensor excitation and ADC reference in sleep/wake cycles. Use Value: Stable 2.5 V output with <120 μVrms noise ensures <0.01% measurement error; SOIC-8 allows automated assembly. |
| Calibrated Thermocouple Interfaces | Micropower Precision Current Sources |
Use Scenario: Cold-junction compensation circuit for Type-K thermocouples in HVAC controllers. IC Role / Device Role / Timing Role: Voltage reference for generating 40.8 μA/K current source driving thermocouple cold-junction diode. Use Value: 150 ppm/°C TC ensures <±0.5°C error over full 0–70°C operating range; low noise prevents thermal EMF measurement corruption. | Use Scenario: Programmable 1–100 μA current source for photodiode biasing in optical smoke detectors. IC Role / Device Role / Timing Role: Set-point reference for op-amp-controlled MOSFET current sink. Use Value: 0.6 Ω dynamic impedance ensures <0.1% current error during step changes; 20 μA–20 mA range covers full design span. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM385BXM-2.5/NOPB | Same SOIC-8 package, identical 2.5 V output, but ±0.8% tolerance and 150 ppm/°C TC - identical electrical specs | No functional difference; same 0°C to 70°C range and SOIC-8 footprint | Select when standard B-grade performance suffices and BM-grade marking is not required for traceability |
| LM385M-2.5/NOPB | SOIC-8, 2.5 V output, ±1.5% initial tolerance (±37.5 mV), 150 ppm/°C TC - looser accuracy, same temp range | Suitable for non-critical biasing where cost sensitivity outweighs precision needs | Choose for cost-sensitive consumer applications where ±1.5% reference error is acceptable |
Compared with LM385BXM-2.5/NOPB, LM385BM-2.5/NOPB offers identical performance but distinct TI internal grade marking for traceability; versus LM385M-2.5/NOPB, it delivers 1.8× tighter initial tolerance at minimal cost premium for precision systems.
Availability
LM385BM-2.5/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, low-power data acquisition, calibrated sensor interfaces, and micropower current source designs requiring stable component supply and consistent SOIC-8 sourcing.
Supply support for LM385BM-2.5/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, specializing in analog ICs, embedded processors, and high-reliability components for industrial, automotive, and consumer markets.
The LM385 family was designed as micropower 2-terminal band-gap voltage references for battery-operated and space-constrained applications demanding low drift, low noise, and robust capacitive-load stability.
FAQ
What is the operating temperature range of the LM385BM-2.5/NOPB?
The LM385BM-2.5/NOPB is rated for operation from 0°C to +70°C. This commercial-grade temperature range aligns with standard industrial and consumer electronics environments. It is distinct from the LM285-2.5-N (−40°C to +85°C) and LM185-2.5-N (−55°C to +125°C), and must not be substituted in extended-temperature applications without validation.
Does the LM385BM-2.5/NOPB require external capacitors for stability?
No, the LM385BM-2.5/NOPB is exceptionally tolerant of capacitive loading and remains stable with output capacitance up to 10 μF. Unlike many shunt references, it does not require series resistance or isolation components, simplifying layout in battery-powered systems where board space is constrained.
How does the LM385BM-2.5/NOPB differ from the LM385M-2.5/NOPB?
The LM385BM-2.5/NOPB features ±0.8% (±20 mV) initial tolerance, while the LM385M-2.5/NOPB has ±1.5% (±37.5 mV) tolerance. Both share identical SOIC-8 packaging, 0°C to 70°C range, and 150 ppm/°C temperature coefficient. The "B" grade provides tighter accuracy for precision measurement applications.
Can the LM385BM-2.5/NOPB be used in a 3-terminal configuration?
No - the LM385BM-2.5/NOPB is strictly a 2-terminal shunt voltage reference. Pins 3–8 are internally unused and must remain unconnected. It functions by sinking current through Pin 1 (anode) to maintain 2.5 V at Pin 2 (cathode); no third terminal exists for adjustment or enable control.
What is the minimum operating current for the LM385BM-2.5/NOPB?
The LM385BM-2.5/NOPB requires a minimum operating current of 20 μA to maintain regulation within specification. Below this threshold, output voltage deviates significantly from 2.5 V. For ultra-low-power sleep modes, designers must ensure bias networks sustain ≥20 μA through the device to preserve reference integrity.
LM385BM-2.5/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:
- Fixed
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- -
- Current - Output:
- 20 mA
- Tolerance:
- ±1.5%
- Temperature Coefficient:
- 150ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 120µVrms
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 20 µA
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
LM385BM-2.5/NOPB FAQ
1.How can I place an order for LM385BM-2.5/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM385BM-2.5/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 LM385BM-2.5/NOPB reliable?
The price and inventory of LM385BM-2.5/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM385BM-2.5/NOPB is usually 5 days.
3.What payment methods are accepted for LM385BM-2.5/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM385BM-2.5/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM385BM-2.5/NOPB?
LM385BM-2.5/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM385BM-2.5/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 LM385BM-2.5/NOPB?
For technical support, including LM385BM-2.5/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM385BM-2.5/NOPB requirements.
6.How does Aetrix verify that LM385BM-2.5/NOPB is sourced from the original manufacturer or authorized distributors?
All LM385BM-2.5/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 LM385BM-2.5/NOPB meets industry standards.
7.What is the process for return or replacement of LM385BM-2.5/NOPB?
All LM385BM-2.5/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM385BM-2.5/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 LM385BM-2.5/NOPB part is unused and in its original packaging.
Return procedure for LM385BM-2.5/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM385BM-2.5/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…
