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HomeProductsIntegrated Circuits (ICs)PMIC - Voltage ReferenceREF191ES-REEL
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REF191ES-REEL - Analog Devices Inc.

Manufacturer Part Number
REF191ES-REEL
Manufacturer
Analog Devices, Inc.
Allelco Part Number
32D-REF191ES-REEL
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
13,870 pcs available, New & Original
Parts Description
IC VREF SERIES 0.1% 8SOIC
Package
8-SOIC
Data sheet
REF191ES-REEL.pdf

Datasheets

REF19x Series.pdf

Other Related Documents

Tape and Reel Packaging.pdf
RoHs Status
 
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Specifications

REF191ES-REEL Tech Specifications
Analog Devices Inc. - REF191ES-REEL technical specifications, attributes, parameters and parts with similar specifications to Analog Devices Inc. - REF191ES-REEL

Product Attribute Attribute Value
Manufacturer Analog Devices, Inc.
Voltage - Output (Min/Fixed) 2.048V
Voltage - Input 3V ~ 15V
Tolerance ±0.1%
Temperature Coefficient 5ppm/°C
Supplier Device Package 8-SOIC
Series REF19
Reference Type Series
Package / Case 8-SOIC (0.154", 3.90mm Width)
Product Attribute Attribute Value
Package Tape & Reel (TR)
Output Type Fixed
Operating Temperature -40°C ~ 85°C (TA)
Noise - 10Hz to 10kHz -
Noise - 0.1Hz to 10Hz 20µVp-p
Mounting Type Surface Mount
Current - Supply 45µA
Current - Output 30 mA
Base Product Number REF191

Environmental & Export Classifications

ATTRIBUTE DESCRIPTION
Moisture Sensitivity Level (MSL) 1 (Unlimited)
ECCN EAR99
HTSUS 8542.39.0001

Parts Introduction

REF191ES-REEL Image
REF191ES-REEL (1)

Manufacturer Part Number

REF191ES-REEL

Manufacturer

Analog Devices

Introduction

The REF191ES-REEL is a high-precision, low-noise voltage reference from Analog Devices. It provides a stable and accurate 2.048V reference voltage, making it suitable for a wide range of applications that require a reliable reference source.

Product Features and Performance

Fixed 2.048V output voltage

±0.1% voltage tolerance

Low temperature coefficient of 5ppm/°C

Low noise performance of 20µVp-p (0.1Hz to 10Hz)

Wide input voltage range of 3V to 15V

Low supply current of 45µA

Operating temperature range of -40°C to 85°C

Product Advantages

Excellent accuracy and stability

Low noise for sensitive applications

Wide input voltage range for flexibility

Small surface mount package for compact designs

Key Reasons to Choose This Product

Precise and reliable reference voltage

Suitable for a variety of power management and instrumentation applications

Cost-effective solution with good performance

Easy to integrate into compact designs

Quality and Safety Features

Qualified to the automotive AEC-Q100 standard

RoHS-compliant and lead-free packaging

Compatibility

The REF191ES-REEL is compatible with a wide range of electronic systems and devices that require a stable and accurate reference voltage.

Application Areas

Power management circuits

Analog-to-digital converters (ADCs)

Precision instrumentation

Industrial control systems

Automotive electronics

Product Lifecycle

The REF191ES-REEL is an obsolete product, meaning it is no longer in active production. However, there are alternative voltage reference models available, such as the REF19xx series, that may offer similar or improved performance characteristics. Customers are advised to contact our website's sales team for more information on current and alternative voltage reference solutions.

Frequently Asked Questions(FAQ)

How does the REF191ES-REEL compare to other voltage reference ICs in terms of noise performance and temperature stability for precision analog designs?
The REF191ES-REEL delivers a 0.1% initial accuracy with a temperature coefficient of 5ppm/°C, making it suitable for applications requiring stable references over varying environmental conditions. Its 20µVp-p noise over the 0.1Hz to 10Hz band is competitive among low-noise references in the same output voltage range, though higher than ultra-low-noise variants like those using buried Zener or laser-trimmed architectures. When compared to alternatives such as the REF3020 (which offers similar output voltage but higher noise), the REF191ES-REEL trades slightly higher noise for lower supply current—45µA versus typical 60–80µA—and better long-term drift characteristics, which can be critical in battery-powered instrumentation.
What are the key design considerations when integrating the REF191ES-REEL into a system with strict power budget constraints?
With a supply current of only 45µA and an input voltage range from 3V to 15V, the REF191ES-REEL is efficient for low-power systems. However, designers must ensure that the minimum operating voltage (3V) does not drop below required levels during load transients or battery discharge. For example, in a 3.3V-powered system nearing end-of-life, headroom may become insufficient if rail droop occurs. Additionally, while the part consumes little power, its 30mA output capability allows driving moderate loads without external buffers, reducing component count and leakage current elsewhere in the circuit.
Can the REF191ES-REEL reliably drive capacitive loads without oscillation or instability?
Yes, the REF191ES-REEL is designed with internal compensation suitable for driving capacitive loads directly. It can typically handle load capacitance up to several hundred picofarads without additional stabilization components. In practice, this means that feedback networks, sensor interfaces, or ADC reference inputs connected to its output can often be stabilized simply by adding a small series resistor (e.g., 10Ω) if very large capacitors (>100nF) are present, rather than requiring complex compensation networks. This behavior aligns with Analog Devices’ characterization data for similar REF19x devices under nominal conditions.
Why might someone choose the REF191ES-REEL instead of a shunt-based Zener reference like the LTZ1000?
Unlike shunt references such as the LTZ1000, which require precise current control and dissipate significant power at higher voltages, the REF191ES-REEL operates in series mode with minimal quiescent current (45µA). This makes it far more efficient in low-voltage, low-power applications—especially where input-to-output differential is small. For instance, in a 3.3V system referencing to 2.048V, a shunt reference would waste hundreds of microwatts, whereas the REF191ES-REEL uses only 45µA. Furthermore, its fixed output simplifies layout and reduces sensitivity to supply variations.
How does the REF191ES-REEL perform in terms of line regulation, and what does this imply for system-level accuracy?
The REF191ES-REEL exhibits excellent line regulation due to its buried Zener architecture and internal feedback loop. While exact values depend on test conditions, it typically maintains output stability within ±0.02% across the full 3V to 15V input range. This implies that fluctuations in supply voltage have minimal impact on the 2.048V reference, preserving overall system accuracy in applications like data converters or precision amplifiers. For context, in a 16-bit ADC system, this level of line regulation contributes less than 1 LSB error even with ±10% supply variation.
Is the REF191ES-REEL suitable for use in automotive or industrial environments beyond its stated operating temperature range?
The REF191ES-REEL is specified for operation from -40°C to +85°C, aligning with standard industrial grades. While it may function outside this range under controlled lab conditions, extrapolating reliability or performance guarantees beyond these limits is not advised. Automotive applications requiring AEC-Q100 qualification would need a qualified variant; Analog Devices offers automotive-grade versions of the REF19 family (e.g., REF191AQ). Thus, for harsh environments exceeding 85°C ambient or with high thermal cycling, alternative packaging or derated designs should be evaluated.
What precautions should be taken when routing signals near the REF191ES-REEL to maintain low-noise performance?
To preserve the REF191ES-REEL’s 20µVp-p noise floor, keep analog traces short and separate them from digital switching nodes or high-impedance paths. Place bypass capacitors (typically 0.1µF ceramic) close to the VIN pin using low-inductance vias. Avoid running clock lines parallel to the reference output trace, as electromagnetic coupling can degrade noise performance. Grounding should follow a star topology if multiple precision circuits share a common supply, ensuring return currents do not circulate through noisy ground loops that could modulate the reference output.
How does the REF191ES-REEL compare to newer-generation references like the ADP791 in terms of cost and integration for space-constrained designs?
The REF191ES-REEL uses the traditional 8-SOIC package, occupying about 5.3mm × 4.9mm on a PCB, whereas modern parts like the ADP791 come in smaller packages (e.g., 3mm × 3mm DFN). While the REF191ES-REEL remains available and cost-effective for non-critical designs, the ADP791 offers lower noise (as low as 10µVp-p), higher PSRR, and reduced footprint. However, if board area is not at a premium and legacy compatibility is needed, the REF191ES-REEL still provides robust performance with proven reliability in existing systems.
Can multiple REF191ES-REEL units be cascaded or paralleled to increase output current or redundancy?
Paralleling REF191ES-REEL devices is not recommended without careful current-sharing resistors and matching of initial tolerance and drift characteristics. Even minor mismatches in output voltage (±0.1%) can cause uneven current distribution, leading to thermal imbalance and reduced reliability. Cascading is also impractical due to its fixed output configuration. Instead, designers should use the REF191ES-REEL’s 30mA capability alone and add an op-amp buffer (e.g., AD8605) if higher drive strength is needed, ensuring stability and isolation between stages.
What impact does aging have on the REF191ES-REEL, and how should this be factored into long-term system calibration strategies?
Over time, voltage references experience drift due to material degradation—particularly in Zener-based devices. The REF191ES-REEL typically exhibits long-term drift of <20ppm/year under normal conditions. In a 2.048V system, this equates to less than 40µV per year. While modest, in high-accuracy applications (e.g., strain gauge bridges or multi-year dataloggers), cumulative drift may necessitate periodic recalibration or use of trim pots during manufacturing. Monitoring reference output via a secondary ADC channel can enable software correction if absolute accuracy degrades beyond acceptable thresholds.
Does the REF191ES-REEL require external components for basic operation, and what are the minimal implementation requirements?
The REF191ES-REEL requires only two decoupling capacitors for reliable operation: a 0.1µF ceramic capacitor on the input (VIN) and optionally a 1µF tantalum or ceramic capacitor for improved transient response. No output capacitor is strictly necessary due to its internal compensation, though adding a small capacitor (≤10nF) can further reduce high-frequency noise in sensitive analog front ends. Input bypassing must be placed within 5mm of the pin to minimize inductive effects, especially in high-impedance source environments.
How does the REF191ES-REEL’s output impedance behave across frequency, and what implications does this have for driving dynamic loads?
The REF191ES-REEL maintains low output impedance (<50mΩ) at DC and remains stable up to several hundred kHz thanks to its unity-gain buffer topology. Across the 10Hz to 10kHz band, output impedance rises gradually but stays below 5Ω, ensuring minimal interaction with downstream filtering or sampling circuits. When driving an ADC’s reference input with RC filters, this characteristic allows straightforward design without risk of peaking or phase margin degradation, provided load capacitance remains under ~200pF unless series resistance is added.
Are there any known limitations in using the REF191ES-REEL with switched-mode power supplies?
Switched-mode power supplies (SMPS) introduce high-frequency ripple and conducted noise that can couple into the REF191ES-REEL’s input. Although the part has reasonable PSRR (typically -60dB at 1kHz), this degrades at higher frequencies. To mitigate issues, place the REF191ES-REEL downstream of LC filters or use linear regulators (e.g., LM3940) dedicated to reference circuits. Direct connection to noisy SMPS rails may result in increased effective noise beyond 20µVp-p, compromising measurement integrity in precision systems.
What is the significance of the REF191ES-REEL’s Moisture Sensitivity Level (MSL) rating of 1, and how does this affect handling and storage?
MSL 1 indicates unlimited shelf life and no special dry storage or baking requirements before assembly. The REF191ES-REEL can be stored indefinitely under normal conditions (≤40°C, ≤85% RH) without moisture-related damage. This simplifies inventory management and reduces manufacturing overhead, particularly beneficial for prototyping or low-volume production runs where frequent handling occurs. However, despite this rating, ESD protection remains essential during manual handling due to the device’s sensitive gate oxides.
How does the REF191ES-REEL support compliance with export classifications like ECCN EAR99?
Classified under ECCN EAR99, the REF191ES-REEL is subject to U.S. export regulations only when combined with encryption functionality, which it lacks. As a general-purpose analog IC, it falls into the least restricted category, facilitating global sourcing and distribution without additional licensing. This classification also simplifies supply chain logistics for international OEMs, reducing delays associated with dual-use controls.
What role does the base product number REF191 play in selecting compatible substitutes or alternate sources for the REF191ES-REEL?
The REF191 base family includes various output voltages (e.g., 1.2V, 2.5V, 4.096V) and package options, enabling cross-referencing based on functional equivalence. Substitutes like the REF191ESZ-REEL differ primarily in marking or reel format but share electrical characteristics. Designers verifying alternates should confirm output voltage, tolerance, temperature coefficient, and package dimensions match the REF191ES-REEL exactly. Misalignment here could compromise PCB layout or calibration routines, especially in space-constrained or thermally sensitive assemblies.

Parts with Similar Specifications

The three parts on the right have similar specifications to Analog Devices Inc. REF191ES-REEL

Product Attribute REF191ESZ-REEL REF191GS-REEL REF191GSZ-REEL REF191ES
Part Number REF191ESZ-REEL REF191GS-REEL REF191GSZ-REEL REF191ES
Manufacturer Analog Devices Inc. Analog Devices Inc. Analog Devices Inc. Analog Devices Inc.
Noise - 0.1Hz to 10Hz - - - -
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C
Base Product Number - DAC34H84 MAX500 ADS62P42
Tolerance - - - -
Output Type - Current - Unbuffered Voltage - Buffered -
Voltage - Input - - - -
Noise - 10Hz to 10kHz - - - -
Current - Supply - - - -
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Package / Case - 196-LFBGA 16-DIP (0.300', 7.62mm) 64-VFQFN Exposed Pad
Voltage - Output (Min/Fixed) - - - -
Current - Output - - - -
Supplier Device Package - 196-NFBGA (12x12) 16-PDIP 64-VQFN (9x9)
Series - - - -
Temperature Coefficient - - - -
Mounting Type - Surface Mount Through Hole Surface Mount
Reference Type - External, Internal External External, Internal

REF191ES-REEL Datasheet PDF

Download REF191ES-REEL pdf datasheets and Analog Devices Inc. documentation for REF191ES-REEL - Analog Devices Inc..

Datasheets
REF19x Series.pdf
PCN Obsolescence/ EOL
Multiple Devices Family 27/Oct/2011.pdf
Other Related Documents
Tape and Reel Packaging.pdf

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Evaluation: 10 Articles

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    Sep 22, 2026

    Used for repair of an older automotive ECU. The MCU was recognized by our programming setup and verification completed without errors. The repaired board now starts and communicates normally.

  • RS48***ieldTech
    Sep 16, 2026

    Put this transceiver into an RS-485 interface used around industrial equipment. Communication remained reliable during testing with motors switching nearby. Good result for the replacement board.

  • Logi***b_Chris
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    Purchased for a Cyclone III development project. The FPGA configured on the first attempt and has been stable through repeated power cycles. No problems with the I/O we are using.

  • Circ***FixerTom
    Sep 2, 2026

    Used this rectifier in a high-current power supply repair. Forward behavior looked normal on the bench and the supply has been running under load without trouble.

  • Retr***UWorks
    Aug 31, 2026

    Needed the exact ST10F269Z2Q6 for servicing an older control unit. The chip programmed successfully and the board passed our functional test afterward. Much easier than redesigning around a newer MCU.

  • Andr***PCBLab
    Aug 28, 2026

    I needed this ADC for an older data acquisition board. Readings have been repeatable and the noise level is comparable to the original circuit. Happy with the purchase.

  • Leat***O'Keefe
    Aug 20, 2026

    one of my hobbies is skydiving. and when i'm skydiving this works great.

  • Ilen***
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    This product works considerably well. It secretly improves my basketball by a lot.

  • Indu***ialPower
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    Great low-power MCU for portable equipment. Flash programming was simple and current consumption matched the datasheet.

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REF191ES-REEL Image

REF191ES-REEL

Analog Devices Inc.
32D-REF191ES-REEL

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