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Texas Instruments REF102BUG4
- Part No.:
- REF102BUG4
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
REF102BUG4.pdf
- Description:
- IC VREF SERIES 0.05% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,742
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Product details
Overview
REF102BUG4 from Texas Instruments is a precision 10V voltage reference IC with ±5mV initial accuracy, 5ppm/°C max drift (B-grade), and 5µVPP low-frequency noise (0.1Hz–10Hz). It operates from 11.4V to 36V supply, delivers ±10mA output current, and is laser-trimmed for high stability in instrumentation-grade analog signal chains.
For engineers reviewing the REF102BUG4 datasheet, REF102BUG4 pinout, REF102BUG4 application, or REF102BUG4 equivalent, key selection criteria include its 2.5ppm/°C max drift over –25°C to +85°C, ±5mV initial error, SOIC-8 package compatibility, and suitability for ADC/DAC reference, precision comparator threshold, and digital voltmeter calibration circuits.
Technical Context
The REF102BUG4 uses a compensated buried zener diode with laser-trimmed resistor network (R1–R3) to achieve 10V output without thermal stabilization. Its internal op amp (A1) provides gain control and trim capability via the VTRIM pin, with minimal drift impact due to matched TCR of external and internal resistors.
It features a dedicated Noise Reduction pin (Pin 5) that forms a low-pass filter with internal R6 (7kΩ) to suppress zener high-frequency noise; a 1µF capacitor here reduces broadband noise from ~800µVPP to <200µVPP. Line regulation is 1ppm/V max, load regulation is 10ppm/mA max for +10mA, and quiescent current remains ≤1.4mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 10.000V ±5mV at +25°C - enables direct substitution in 10V reference designs without recalibration. |
| Tempco (Drift) | 5ppm/°C max over –25°C to +85°C - ensures ≤0.55mV total output shift across full industrial range. |
| Long-Term Stability | 20ppm/1000hr (typ after 168hr stabilization) - supports multi-year calibration validity in test equipment. |
| Noise (0.1–10Hz) | 5µVPP typ - critical for high-resolution 24-bit ADCs and precision digital multimeters. |
| Supply Range | +11.4V to +36V DC - allows single-supply operation in industrial power rails without LDO pre-regulation. |
| Output Current | +10mA / –5mA - sufficient to drive 10kΩ loads directly or bias op amps in buffered reference circuits. |
| Line Regulation | 1ppm/V max - contributes <0.035ppm error per volt variation in unregulated 24V systems. |
| Load Regulation | 10ppm/mA max (0 to +10mA) - adds ≤0.1mV error when sourcing full rated current. |
Pinout & Package
REF102BUG4 is housed in an SOIC-8 (D) package, 3.9mm × 4.9mm, 1.75mm max height, RoHS-compliant with NIPDAU lead finish and MSL Level-2-260°C-1 year rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | No Connect (NC) | Internally unused; must be left floating or tied to ground - no electrical function. |
| 2 | V+ | Positive supply input; accepts 11.4V–36V; requires ≥1µF local tantalum bypass for stability. |
| 3 | Com | Ground reference terminal; star-point connection required to minimize ground loop errors. |
| 4 | NC | No Connect; electrically isolated - no internal connection or function. |
| 5 | Noise Reduction | Connect 1µF capacitor to ground to reduce high-frequency zener noise by >75%. |
| 6 | VOUT | 10V precision output; capable of sourcing +10mA or sinking –5mA into load. |
| 7 | Trim | External adjustment node; ±3% trim range with <0.008ppm/°C drift penalty per mV trimmed. |
| 8 | NC | No Connect; no internal bond wire - leave unconnected per TI layout guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| Laser-trimmed zener + op-amp architecture | Eliminates heater-based stabilization, enabling fast warm-up (<15µs to 0.1%) and low 1.4mA quiescent current. |
| Dedicated noise reduction pin (Pin 5) | Enables configurable low-pass filtering (f−3dB ≈ 22Hz with 1µF) to suppress zener broadband noise without external op amps. |
| ±3% external output trim capability | Allows fine-tuning to exact system requirements while preserving <0.008ppm/°C drift penalty per mV - critical for metrology-grade calibration. |
| Robust line/load regulation | 1ppm/V and 10ppm/mA specs ensure <0.1mV total error under worst-case supply ripple and load transients in automated test equipment. |
| SOIC-8 footprint with industry-standard pinout | Direct drop-in replacement for REF102AU/BU/CU variants and compatible with existing PCB layouts using D-package land patterns. |
| Stable capacitive loading | Supports up to 1000pF output capacitance - simplifies filtering and eliminates need for isolation buffers in data acquisition front-ends. |
Applications
| Digital Voltmeter Calibration | High-Resolution ADC Reference |
|---|---|
|
Use Scenario: Primary 10V reference in handheld and benchtop digital multimeters requiring NIST-traceable accuracy. IC Role / Device Role / Timing Role: Stable voltage standard against which input signals are measured; defines full-scale quantization step. Use Value: ±5mV initial error and 5ppm/°C drift enable 6½-digit DVM accuracy without periodic recalibration. |
Use Scenario: Reference source for 24-bit sigma-delta ADCs in precision data loggers and sensor signal conditioners. IC Role / Device Role / Timing Role: Analog reference rail determining LSB size and absolute measurement fidelity. Use Value: 5µVPP low-frequency noise ensures <0.3LSB noise floor in 10V full-scale 24-bit conversion (≈0.6µV/LSB). |
| Precision Comparator Threshold | PC-Based Instrumentation Reference |
|
Use Scenario: Fixed threshold generator for window comparators in battery monitoring and overvoltage protection circuits. IC Role / Device Role / Timing Role: Stable trip point defining logic state transitions independent of supply fluctuations. Use Value: 1ppm/V line regulation limits threshold shift to <0.035mV per volt of rail variation - prevents false triggers in noisy industrial environments. |
Use Scenario: Embedded reference in USB-connected oscilloscopes, spectrum analyzers, and arbitrary waveform generators. IC Role / Device Role / Timing Role: System-level voltage standard for DAC output scaling, ADC input scaling, and internal calibration routines. Use Value: 20ppm/1000hr long-term stability ensures <10ppm drift over 6 months - maintains factory calibration between user service intervals. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF102CU | ±2.5mV initial error, 2.5ppm/°C max drift - tighter spec than REF102BUG4's ±5mV/5ppm. | Suitable for metrology-grade calibrators and aerospace test sets where sub-10ppm total error budget is mandatory. | Select REF102CU when drift and initial accuracy must both meet C-grade; REF102BUG4 offers B-grade cost/performance balance. |
| ADR441BRZ | 10V output, ±1.5mV initial error, 3ppm/°C max drift, but requires 4.5V–18V supply - narrower range than REF102BUG4. | Better for low-voltage portable instruments; incompatible with 24V/36V industrial rails where REF102BUG4 excels. | Choose ADR441BRZ for battery-powered or USB-powered precision instruments; REF102BUG4 remains optimal for wide-supply industrial systems. |
Compared with REF102CU, REF102BUG4 trades 2.5ppm/°C drift and ±2.5mV accuracy for lower cost and identical SOIC-8 footprint; versus ADR441BRZ, it supports higher supply voltages but lacks ultra-low-noise performance below 0.1Hz.
Availability
REF102BUG4 is available at Aetrix Electronics and suitable for digital voltmeter calibration, high-resolution ADC reference, and precision comparator threshold applications requiring stable component supply across extended production lifecycles.
Supply support for REF102BUG4 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 heritage in precision analog design and industrial-grade reliability.
The REF102 product line was engineered specifically for high-stability, low-drift voltage references in test and measurement, industrial automation, and scientific instrumentation - prioritizing long-term accuracy over cost or integration density.
FAQ
What is the maximum supply voltage for the REF102BUG4?
The REF102BUG4 supports an absolute maximum input voltage of +40V, but its specified operating range is +11.4V to +36V DC. Operation above +36V risks exceeding safe power dissipation limits and may degrade long-term stability. For reliable performance in industrial 24V systems, a 36V-rated input is sufficient and aligns with the device's tested line regulation specification of 1ppm/V.
Can the REF102BUG4 drive a 10kΩ load directly?
Yes, the REF102BUG4 can drive a 10kΩ load directly: at 10V output, this draws only 1mA, well within its +10mA sourcing capability. Load regulation is specified at 10ppm/mA, so the resulting error is just 10ppm (0.1mV). No buffer amplifier is needed unless dynamic load current exceeds ±5mA or low-impedance driving is required for fast settling.
How does the Noise Reduction pin (Pin 5) function in the REF102BUG4?
The Noise Reduction pin (Pin 5) connects internally to a 7kΩ resistor (R6) forming a low-pass filter with an external capacitor to ground. With a 1µF capacitor, the −3dB frequency is ~22Hz, reducing high-frequency zener noise from ~800µVPP to under 200µVPP. This feature preserves REF102BUG4's 5µVPP (0.1–10Hz) low-frequency spec while suppressing broadband noise without adding external components.
Is the REF102BUG4 pin-compatible with other REF102 variants like REF102AU or REF102CU?
Yes, the REF102BUG4 is fully pin-compatible with all REF102 SOIC-8 variants (REF102AU, REF102CU, etc.) - same 8-pin D-package, identical pinout, and shared footprint. Differences are limited to grade-specific parameters (initial error, drift, stability), not physical or electrical interface. PCBs designed for REF102AU can accept REF102BUG4 without modification.
What is the warm-up time specification for the REF102BUG4?
The REF102BUG4 achieves 0.1% output stability in 15µs after power turn-on when the Noise Reduction pin is left floating. This fast warm-up is enabled by its heaterless zener architecture and makes it suitable for pulsed or duty-cycled instrumentation where rapid settling is required. With a 1µF noise reduction capacitor, warm-up time increases slightly but remains under 10ms.
REF102BUG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Discontinued at Digi-Key
- Reference Type:
- Series
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 10V
- Voltage - Output (Max):
- -
- Current - Output:
- 10 mA
- Tolerance:
- ±0.05%
- Temperature Coefficient:
- 5ppm/°C
- Noise - 0.1Hz to 10Hz:
- 5µVp-p
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- 11.4V ~ 36V
- Current - Supply:
- 1.4mA
- Current - Cathode:
- -
- Operating Temperature:
- -25°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
REF102BUG4 FAQ
1.How can I place an order for REF102BUG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for REF102BUG4 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 REF102BUG4 reliable?
The price and inventory of REF102BUG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for REF102BUG4 is usually 5 days.
3.What payment methods are accepted for REF102BUG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for REF102BUG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for REF102BUG4?
REF102BUG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your REF102BUG4 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 REF102BUG4?
For technical support, including REF102BUG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your REF102BUG4 requirements.
6.How does Aetrix verify that REF102BUG4 is sourced from the original manufacturer or authorized distributors?
All REF102BUG4 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 REF102BUG4 meets industry standards.
7.What is the process for return or replacement of REF102BUG4?
All REF102BUG4 units undergo pre-shipment inspection (PSI). If there is an issue with REF102BUG4, 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 REF102BUG4 part is unused and in its original packaging.
Return procedure for REF102BUG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
REF102BUG4 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
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