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Texas Instruments LM385BPWR-2-5
- Part No.:
- LM385BPWR-2-5
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM385BPWR-2-5.pdf
- Description:
- IC VREF SHUNT 1.5% 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,105
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Product details
Overview
LM385BPWR-2-5 from Texas Instruments is a micropower, two-terminal, band-gap shunt voltage reference delivering a precise 2.5 V output with ±1.5% initial tolerance (LM385B grade), 1.5 Ω max reference impedance over 0°C to 70°C, and 20 μA to 20 mA operating current range. It serves as a stable reference in portable test instruments, battery-operated systems, and current-loop instrumentation where low power and temperature stability are critical.
For engineers reviewing the LM385BPWR-2-5 datasheet, LM385BPWR-2-5 pinout, LM385BPWR-2-5 application, or LM385BPWR-2-5 equivalent, this page delivers verified specifications, TSSOP-8 package details, real-world use cases, and validated alternative parts for precision analog design and low-power embedded reference circuits.
Technical Context
The LM385BPWR-2-5 implements a floating shunt topology using an internal band-gap reference core, high-gain amplifier, and shunt pass element to maintain 2.5 V between cathode and anode. Regulation initiates only when minimum cathode current (8–20 μA) is supplied, and internal frequency compensation ensures stability across all capacitive loads.
Its design supports both positive and negative regulation configurations, exhibits low broadband noise (120 µV, 10 Hz–10 kHz), and achieves ±20 ppm/°C average temperature coefficient over its full operating range - enabling accurate voltage referencing without external trimming or compensation circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.462 V to 2.538 V at 25°C - tight 1.5% initial tolerance enables high-accuracy ADC/DAC biasing without calibration. |
| Operating Current Range | 20 μA to 20 mA - ultra-low minimum current extends battery life in micropower systems; wide range simplifies resistor-based biasing. |
| Reference Impedance | ≤1.5 Ω over 0°C to 70°C - ensures minimal output voltage shift under dynamic load changes in precision analog circuits. |
| Tempco | ±20 ppm/°C - guarantees ≤0.5 mV drift over full temperature range, critical for portable meter accuracy. |
| Broadband Noise | 120 µV (10 Hz–10 kHz) - low noise preserves signal integrity in high-resolution sensor front-ends and precision references. |
| Long-Term Stability | ±20 ppm/khr - supports >10-year reliability in unattended instrumentation and panel meters. |
Pinout & Package
TSSOP-8 package (3.00 mm × 4.40 mm body, 0.65 mm pitch); 1.2 mm max height; RoHS-compliant NiPdAu lead finish; MSL Level-1 (260°C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ANODE (Pin 6) | Common terminal | Typically connected to ground or system return; defines reference potential for cathode voltage. |
| CATHODE (Pin 2) | Shunt current/voltage input | Current-sink node where regulated 2.5 V appears relative to ANODE; requires external current source for operation. |
| Pins 1, 3–5, 7–8 | No internal connection | Unused terminals; must remain unconnected or tied to ANODE per layout best practices to avoid parasitic coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Band-gap reference core | Delivers intrinsic 2.5 V with low long-term drift (±20 ppm/khr) and minimal aging effects in battery-powered deployments. |
| Floating shunt architecture | Enables use in both high-side and low-side configurations - e.g., generating negative references or sensing current in grounded-load topologies. |
| Capacitive-load tolerance | Stable with ≥0.1 µF ceramic bypass on cathode - eliminates need for complex compensation networks in space-constrained PCBs. |
| Micropower operation | 20 μA minimum cathode current allows >10-year shelf-life-equivalent battery operation in portable meters and IoT sensors. |
Applications
| Portable Test Instruments | Battery-Operated Systems |
|---|---|
Use Scenario: Handheld multimeter requiring stable 2.5 V reference for 16-bit ADC conversion across varying battery voltage (3.0–4.2 V Li-ion). IC Role / Device Role / Timing Role: Shunt voltage reference providing fixed reference potential for analog-to-digital conversion. Use Value: Enables <1 LSB error over temperature and battery discharge cycle due to ±20 ppm/°C tempco and 1.5 Ω impedance. |
Use Scenario: Wireless sensor node powered by coin-cell battery (CR2032), operating for 5+ years without replacement. IC Role / Device Role / Timing Role: Micropower voltage reference for precision op-amp biasing and sensor excitation. Use Value: 20 μA minimum operating current extends usable battery life beyond shelf life; low noise avoids signal corruption in weak sensor outputs. |
| Current-Loop Instrumentation | Panel Meters |
Use Scenario: 4–20 mA transmitter where reference voltage sets loop current scaling via precision resistor. IC Role / Device Role / Timing Role: Stable 2.5 V reference defining current setpoint in HART-compatible transmitters. Use Value: 1.5% initial tolerance and ±20 ppm/°C drift ensure <0.1% full-scale error over industrial temperature range (0°C to 70°C). |
Use Scenario: Front-panel digital voltmeter in industrial control cabinet with ambient temperature swings. IC Role / Device Role / Timing Role: Primary reference for analog front-end and display driver ICs. Use Value: Low dynamic impedance (≤1.5 Ω) prevents reading instability during rapid input changes; long-term stability reduces recalibration frequency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM385PWR-2-5 | Same TSSOP-8 package and 2.5 V output, but LM385 grade (±3% initial tolerance vs. LM385B's ±1.5%). Reference impedance ≤1.5 Ω unchanged. | Suitable for cost-sensitive designs where 3% tolerance is acceptable; less suitable for high-accuracy metering. | Select LM385PWR-2-5 only if system-level calibration compensates for initial error; LM385BPWR-2-5 preferred for factory-calibrated instruments. |
| REF3025AIDBZR | 2.5 V series reference (SOT-23-3), 0.2% initial tolerance, 50 ppm/°C tempco, 50 μA typical quiescent current - higher accuracy but higher power than LM385BPWR-2-5. | Requires series configuration (input-to-output path); incompatible with shunt-based topologies like current-loop sensing. | Choose REF3025AIDBZR only when absolute accuracy outweighs power budget constraints and shunt topology is not required. |
Compared with LM385PWR-2-5 and REF3025AIDBZR, the LM385BPWR-2-5 uniquely balances micropower operation (20 μA min), shunt flexibility, and 1.5% precision - making it optimal for battery-powered, space-constrained, and current-sensing applications where topology and efficiency are non-negotiable.
Availability
LM385BPWR-2-5 is available at Aetrix Electronics and suitable for portable test instruments, battery-operated systems, and current-loop instrumentation requiring stable component supply, long-lifecycle support, and RoHS-compliant TSSOP packaging.
Supply support for LM385BPWR-2-5 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 decades of leadership in precision voltage references and power management ICs.
The LM385B series was designed specifically for micropower, high-stability shunt references in portable, battery-critical, and industrial instrumentation applications - emphasizing low drift, wide current range, and robust capacitive-load immunity.
FAQ
What is the minimum cathode current required for regulation in the LM385BPWR-2-5?
The LM385BPWR-2-5 requires a minimum cathode current (IZ(MIN)) of 8 μA to 20 μA over its full operating temperature range (0°C to 70°C). At 25°C, regulation is guaranteed above 8 μA, but design margin should target ≥20 μA to ensure stability across temperature extremes. This low threshold directly enables multi-year operation from coin-cell batteries in the LM385BPWR-2-5.
Can the LM385BPWR-2-5 be used in a negative voltage reference configuration?
Yes - the LM385BPWR-2-5 is a floating shunt device, meaning its ANODE and CATHODE terminals have no fixed relationship to ground. By connecting ANODE to a negative rail and sourcing current into CATHODE, it establishes a stable −2.5 V reference relative to that rail. This capability is explicitly supported in TI's application notes and makes the LM385BPWR-2-5 suitable for bipolar op-amp biasing and dual-supply sensor interfaces.
What is the maximum capacitive load the LM385BPWR-2-5 can drive without oscillation?
The LM385BPWR-2-5 is internally compensated for unconditional stability with any capacitive load, including ≥0.1 µF ceramic bypass capacitors on the CATHODE pin. TI's datasheet confirms stable operation up to 10 µF, eliminating the need for series resistance or external compensation - a key advantage over older shunt references and critical for noise-sensitive applications using the LM385BPWR-2-5.
How does the LM385BPWR-2-5 differ from the LM385-2.5 in terms of voltage tolerance?
The LM385BPWR-2-5 belongs to the LM385B family and features ±1.5% initial voltage tolerance (2.462 V to 2.538 V), whereas the standard LM385-2.5 offers ±3% tolerance (2.425 V to 2.575 V). Both share identical thermal performance (±20 ppm/°C), impedance (≤1.5 Ω), and operating current range - making the LM385BPWR-2-5 the preferred choice when tighter initial accuracy is required without changing layout or bill-of-materials.
Is the LM385BPWR-2-5 compatible with lead-free reflow processes?
Yes - the LM385BPWR-2-5 uses NiPdAu lead finish and is rated MSL Level-1 with unlimited floor life and peak reflow temperature of 260°C, fully compliant with IPC/JEDEC J-STD-020D. Its TSSOP-8 package has been qualified for standard lead-free soldering profiles, ensuring reliable assembly in modern SMT lines without special handling requirements for the LM385BPWR-2-5.
LM385BPWR-2-5 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 8-TSSOP (0.173", 4.40mm Width)
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- 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:
- 20ppm/°C Typical
- 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-TSSOP
LM385BPWR-2-5 FAQ
1.How can I place an order for LM385BPWR-2-5 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM385BPWR-2-5 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 LM385BPWR-2-5 reliable?
The price and inventory of LM385BPWR-2-5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM385BPWR-2-5 is usually 5 days.
3.What payment methods are accepted for LM385BPWR-2-5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM385BPWR-2-5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM385BPWR-2-5?
LM385BPWR-2-5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM385BPWR-2-5 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 LM385BPWR-2-5?
For technical support, including LM385BPWR-2-5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM385BPWR-2-5 requirements.
6.How does Aetrix verify that LM385BPWR-2-5 is sourced from the original manufacturer or authorized distributors?
All LM385BPWR-2-5 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 LM385BPWR-2-5 meets industry standards.
7.What is the process for return or replacement of LM385BPWR-2-5?
All LM385BPWR-2-5 units undergo pre-shipment inspection (PSI). If there is an issue with LM385BPWR-2-5, 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 LM385BPWR-2-5 part is unused and in its original packaging.
Return procedure for LM385BPWR-2-5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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