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Texas Instruments LM385BYZ-2.5/NOPB
- Part No.:
- LM385BYZ-2.5/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-226-3, TO-92-3 (TO-226AA)
- Datasheet:
-
LM385BYZ-2.5/NOPB.pdf
- Description:
- IC VREF SHUNT 1.5% TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:144
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Product details
Overview
LM385BYZ-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 (Y grade), 50 ppm/°C max average temperature coefficient, and 0.6 Ω dynamic impedance. It operates over 20 μA to 20 mA supply current and 0°C to 70°C ambient temperature, enabling use in battery-powered precision analog circuits, portable instrumentation, and low-power ADC/DAC biasing.
For engineers reviewing the LM385BYZ-2.5/NOPB datasheet, LM385BYZ-2.5/NOPB pinout, LM385BYZ-2.5/NOPB application, or LM385BYZ-2.5/NOPB equivalent, key selection considerations include its TO-92 package compatibility, micropower operation down to 20 μA, tight initial accuracy, low thermal drift, and capacitive load tolerance-critical for stable reference design in space-constrained, low-quiescent systems.
Technical Context
The LM385BYZ-2.5/NOPB implements a band-gap reference architecture using only transistors and resistors, yielding low noise (120 μV rms, 10 Hz–10 kHz) and excellent long-term stability (20 ppm after 1000 hours). Its 2-terminal configuration simplifies layout and eliminates external bias components.
Designed for wide operating current range (20 μA–20 mA), it maintains regulation across varying supply conditions and exhibits exceptional tolerance to capacitive loading-enabling direct connection to ADC reference inputs or op-amp feedback networks without destabilization.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.5 V nominal output with ±20 mV (±0.8%) initial tolerance at 25°C - ensures accurate system-level calibration without trimming. |
| Temperature Coefficient | 50 ppm/°C max (Y grade) - limits full-temperature-range drift to ≤87.5 mV over 0°C to 70°C, supporting precision measurement. |
| Operating Current Range | 20 μA to 20 mA - enables ultra-low-power standby modes and robust operation under variable load conditions. |
| Dynamic Impedance | 0.6 Ω at 100 μA - provides low AC impedance for high-frequency noise rejection and fast transient response. |
| Wideband Noise | 120 μV rms (10 Hz–10 kHz) - minimizes added noise in high-resolution data acquisition front-ends. |
| Long-Term Stability | 20 ppm after 1000 hours - supports reliable performance in field-deployed instrumentation with minimal recalibration. |
Pinout & Package
LM385BYZ-2.5/NOPB is housed in a 3-pin TO-92 plastic package (Package Drawing LP0003A), with leads formed for through-hole mounting. Pin 1 is Anode, Pin 2 is Cathode, and Pin 3 is internally connected to the die attach pad and may be left floating or tied to Pin 2 per TI recommendation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode | Current input terminal; connects to positive supply rail in standard 2-terminal shunt reference configuration. |
| Pin 2 | Cathode | Reference output node; provides stable 2.5 V relative to system ground when current flows from Pin 1 to Pin 2. |
| Pin 3 | Die Attach Pad (DAP) | Internally bonded to substrate; electrically connected to Pin 2 - recommended to tie to Pin 2 or leave floating per datasheet guidance. |
Key Features
| Feature | Design Value |
|---|---|
| Micropower operation | Functional down to 20 μA - extends battery life in portable meters and IoT sensor nodes beyond shelf life. |
| Capacitive load tolerance | No external compensation required up to ≥10 μF - simplifies PCB layout and improves reliability in noisy environments. |
| Tight initial accuracy | ±20 mV (±0.8%) tolerance (Y grade) - reduces or eliminates need for factory calibration in cost-sensitive applications. |
| Low dynamic impedance | 0.6 Ω at 100 μA - maintains regulation during fast load transients common in multiplexed ADC sampling. |
| Hermetic-grade stability | 20 ppm long-term drift (1000 hr) - ensures consistent reference performance in unattended industrial monitoring systems. |
Applications
| Portable Digital Multimeter | Industrial Temperature Transmitter |
|---|---|
|
Use Scenario: Battery-powered handheld DMM requiring stable 2.5 V reference for 16-bit SAR ADC conversion. IC Role / Device Role / Timing Role: Shunt voltage reference providing precision scaling for analog front-end gain and offset calibration. Use Value: 20 μA minimum operating current enables >1-year battery life; ±20 mV tolerance ensures <0.1% full-scale error before calibration. |
Use Scenario: Loop-powered 4–20 mA transmitter with RTD interface and cold-junction compensation. IC Role / Device Role / Timing Role: Stable excitation and reference source for ratiometric RTD measurement and thermocouple cold-junction compensation circuitry. Use Value: 50 ppm/°C tempco ensures <±0.25°C measurement error over 0°C–70°C ambient; low noise avoids digitization artifacts. |
| Low-Power Data Logger | Medical Patient Monitor Sensor Interface |
|
Use Scenario: Solar-charged environmental logger sampling thermistor and humidity sensors every 5 minutes. IC Role / Device Role / Timing Role: Primary reference for microcontroller's internal ADC and external signal conditioning amplifiers. Use Value: 20 μA quiescent draw minimizes sleep-mode power; TO-92 package allows compact, cost-effective through-hole assembly. |
Use Scenario: Portable ECG module requiring low-noise, stable reference for analog front-end instrumentation amplifiers and ADCs. IC Role / Device Role / Timing Role: Precision DC bias and reference voltage generator for biopotential signal chain. Use Value: 120 μV rms noise prevents degradation of microvolt-level ECG signals; RoHS-compliant NOPB finish meets medical regulatory requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM385BXZ-2.5/NOPB | ±15 mV (±0.6%) initial tolerance (X grade); 30 ppm/°C max tempco | Higher accuracy and lower drift - preferred where tighter calibration budget exists | Select when system-level accuracy demands sub-0.1% reference error without trimming |
| LM385BZ-2.5/NOPB | ±50 mV (±2.0%) initial tolerance (B grade); 150 ppm/°C max tempco | Lower cost and relaxed specs - suitable for non-critical biasing or coarse calibration | Choose for cost-sensitive consumer electronics where reference drift is compensated digitally |
Compared with LM385BXZ-2.5/NOPB, LM385BYZ-2.5/NOPB trades 10 ppm/°C higher tempco for broader availability and lower unit cost; versus LM385BZ-2.5/NOPB, it delivers 3× better initial accuracy and half the thermal drift-justifying its use in mid-tier industrial and medical designs.
Availability
LM385BYZ-2.5/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, industrial sensor transmitters, low-power data loggers, and medical device analog front-ends requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for LM385BYZ-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 leader specializing in analog and embedded processing technologies, with decades of expertise in precision reference design and high-reliability manufacturing.
The LM385 family was engineered for micropower, high-stability voltage referencing in battery-operated and space-constrained systems-targeting portable test equipment, industrial process control, and medical diagnostics where accuracy, longevity, and low power are critical.
FAQ
What is the operating temperature range for LM385BYZ-2.5/NOPB?
The LM385BYZ-2.5/NOPB is rated for operation from 0°C to 70°C ambient temperature. This commercial-grade range aligns with its intended use in non-aerospace, non-military instrumentation and embedded systems where extended industrial or automotive temperature coverage is not required. The device's thermal characteristics-including 50 ppm/°C max temperature coefficient-are specified and tested within this range.
Can LM385BYZ-2.5/NOPB drive a 10 µF capacitor directly?
Yes, LM385BYZ-2.5/NOPB is explicitly designed for exceptional capacitive load tolerance and can drive ≥10 µF directly without external compensation or series resistance. This capability stems from its internal band-gap architecture and low dynamic impedance (0.6 Ω), making it ideal for decoupling sensitive ADC reference inputs or stabilizing op-amp bias networks in noisy environments.
What does the 'Y' suffix indicate in LM385BYZ-2.5/NOPB?
The 'Y' suffix in LM385BYZ-2.5/NOPB denotes the Y-grade temperature coefficient specification: 50 ppm/°C maximum average drift over the full operating temperature range (0°C to 70°C). It also corresponds to ±20 mV (±0.8%) initial voltage tolerance at 25°C. This grade sits between the tighter X-grade (30 ppm/°C, ±15 mV) and looser B-grade (150 ppm/°C, ±50 mV).
Is LM385BYZ-2.5/NOPB RoHS compliant?
Yes, LM385BYZ-2.5/NOPB is RoHS and Green compliant, as confirmed by Texas Instruments' packaging documentation. The '/NOPB' suffix explicitly indicates lead-free termination (Pb-free), and the device meets EU RoHS requirements for all 10 restricted substances, including ≤0.1% by weight threshold for homogeneous materials.
How does LM385BYZ-2.5/NOPB differ from LM285BYZ-2.5/NOPB?
LM385BYZ-2.5/NOPB and LM285BYZ-2.5/NOPB share identical electrical specifications (Y-grade tolerance, tempco, impedance), but differ in operating temperature range: LM385BYZ-2.5/NOPB is rated 0°C to 70°C, while LM285BYZ-2.5/NOPB extends to −40°C to +85°C. Both use the same TO-92 (LP) package and marking format ('385BY Z-2.5' vs '285BY Z2.5'), enabling drop-in substitution where ambient temperature stays within 0°C–70°C.
LM385BYZ-2.5/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:
- Fixed
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- -
- Current - Output:
- 20 mA
- Tolerance:
- ±1.5%
- Temperature Coefficient:
- 50ppm/°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:
- Through Hole
- Supplier Device Package:
- TO-92-3
LM385BYZ-2.5/NOPB FAQ
1.How can I place an order for LM385BYZ-2.5/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM385BYZ-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 LM385BYZ-2.5/NOPB reliable?
The price and inventory of LM385BYZ-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 LM385BYZ-2.5/NOPB is usually 5 days.
3.What payment methods are accepted for LM385BYZ-2.5/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM385BYZ-2.5/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM385BYZ-2.5/NOPB?
LM385BYZ-2.5/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM385BYZ-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 LM385BYZ-2.5/NOPB?
For technical support, including LM385BYZ-2.5/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM385BYZ-2.5/NOPB requirements.
6.How does Aetrix verify that LM385BYZ-2.5/NOPB is sourced from the original manufacturer or authorized distributors?
All LM385BYZ-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 LM385BYZ-2.5/NOPB meets industry standards.
7.What is the process for return or replacement of LM385BYZ-2.5/NOPB?
All LM385BYZ-2.5/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM385BYZ-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 LM385BYZ-2.5/NOPB part is unused and in its original packaging.
Return procedure for LM385BYZ-2.5/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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