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Analog Devices Inc. REF198FS-REEL
- Part No.:
- REF198FS-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
REF198FS-REEL.pdf
- Description:
- IC VREF SERIES 0.12% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,941
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Product details
Overview
REF198FS-REEL from Analog Devices is a precision micropower low-dropout voltage reference IC delivering 4.096 V output with ±2 mV initial accuracy, 5 ppm/°C max temperature coefficient, and 45 μA max supply current-designed for high-accuracy ADC/DAC biasing in portable instrumentation and solar-powered sensor nodes.
For engineers reviewing the REF198FS-REEL datasheet, REF198FS-REEL pinout, REF198FS-REEL application, or REF198FS-REEL equivalent, key selection criteria include dropout voltage (≤1.45 V at 20 mA), sleep-mode current (≤15 μA), load regulation (≤10 ppm/mA), and SOIC_N package compatibility with Kelvin-sensing layouts.
Technical Context
The REF198FS-REEL implements a patented curvature-corrected band gap core with laser-trimmed thin-film resistors to achieve stable 4.096 V output across −40°C to +125°C. Its SLEEP pin enables TTL/CMOS-compatible shutdown, reducing quiescent current to ≤15 μA while disabling output.
It operates with input supply as low as 100 mV above output (i.e., ≥4.196 V), supports 30 mA output current, and requires only a 1 μF output bypass capacitor for stability-making it suitable for low-headroom, battery-constrained systems where long-term drift (<1.2 mV/1000 h @ 125°C) and low noise (≤45 μV p-p, 0.1–10 Hz) are critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Output Voltage | 4.096 V - matches common 12-bit DAC/ADC full-scale reference points |
| Initial Accuracy | ±2 mV maximum - ensures ≤0.049% error before calibration |
| Temp Coefficient | 5 ppm/°C max - guarantees ≤±0.25 mV drift over −40°C to +85°C |
| Supply Current | 45 μA max - enables multi-year operation on coin-cell batteries |
| Sleep Current | 15 μA max - allows ultra-low-power duty-cycled sensing |
| Dropout Voltage | 1.45 V max at 20 mA - supports operation from single Li-ion or 5 V rails with margin |
| Load Regulation | 10 ppm/mA max - maintains <±0.042 mV change per mA load shift |
Pinout & Package
REF198FS-REEL is housed in an 8-lead SOIC_N (SOIC-8 narrow-body) package, pin-compatible with industry-standard SOIC-8 footprints and optimized for thermal stability and PCB layout simplicity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (TP) | Factory Test Point | Zener-zap trimming node; must remain unconnected in circuit |
| 2 (VS) | Positive Supply Input | Accepts 4.196 V to 15 V; minimum headroom = 100 mV above VOUT |
| 3 (SLEEP) | Digital Enable Control | TTL/CMOS-compatible; low = output disabled, IQ ≤15 μA |
| 4 (GND) | Analog Ground Reference | Return path for output and internal bias; Kelvin connection recommended |
| 5 (TP) | Factory Test Point | Zener-zap trimming node; must remain unconnected in circuit |
| 6 (NC) | No Connect | Internally unused; leave floating or tie to GND per layout best practice |
| 7 (NC) | No Connect | Internally unused; leave floating or tie to GND per layout best practice |
| 8 (OUTPUT) | Precision Voltage Output | 4.096 V source with 30 mA sink/source capability; bypass with 1 μF to GND |
Key Features
| Feature | Design Value |
|---|---|
| Curvature-Corrected Band Gap Core | Enables 5 ppm/°C tempco without external compensation components |
| Laser-Trimmed Thin-Film Resistors | Guarantees ±2 mV initial accuracy without post-assembly calibration |
| Low-Dropout Operation (100 mV headroom) | Permits direct use from single-cell Li-ion (3.0–4.2 V) with 4.096 V output |
| Sleep Mode with TTL/CMOS Interface | Reduces system standby power by >65% vs active mode (45 → 15 μA) |
| Short-Circuit Protected Output | Withstands indefinite output-to-GND fault without damage or parameter shift |
Applications
| Portable Instrumentation | High-Resolution Data Acquisition |
|---|---|
Use Scenario: Handheld multimeter with 16-bit SAR ADC and battery-powered operation. IC Role / Device Role / Timing Role: Primary reference for ADC conversion and internal DAC-based auto-zero calibration. Use Value: 4.096 V output aligns with 212 scaling; 5 ppm/°C tempco ensures <±0.5 LSB drift over operating temperature. | Use Scenario: Industrial process monitor logging temperature/pressure via 24-bit ΣΔ ADC. IC Role / Device Role / Timing Role: Stable excitation and reference source for ratiometric sensor bridges and ADC reference input. Use Value: 10 ppm/mA load regulation prevents gain error during dynamic sensor excitation current changes. |
| Solar-Powered Remote Sensors | Loop-Powered 4–20 mA Transmitters |
Use Scenario: Wireless soil moisture node powered by small photovoltaic cell and supercapacitor buffer. IC Role / Device Role / Timing Role: Low-quiescent reference for microcontroller ADC and analog front-end conditioning. Use Value: 45 μA supply current extends usable daylight runtime; sleep mode cuts idle draw to 15 μA during transmission gaps. | Use Scenario: Two-wire 4–20 mA field transmitter with HART modulation, powered from loop current. IC Role / Device Role / Timing Role: Precision reference for current-loop DAC and sensor signal conditioning within tight 3.5–30 V loop compliance. Use Value: 1.45 V dropout enables operation down to 5.546 V supply-well within 3.5 V minimum loop compliance margin. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADR3440ARJZ-R7 | 4.096 V output, 3 ppm/°C max tempco, 12 μA typical IQ, no SLEEP pin | Lower drift but no digital shutdown; requires external enable logic for ultra-low-power sleep | Select when lowest possible tempco is prioritized over integrated control |
| MAX6126AASA41+T | 4.096 V output, 3 ppm/°C max tempco, 95 μA IQ, no SLEEP pin, higher noise (60 μV p-p) | Higher supply current limits battery life; lacks sleep functionality for duty-cycled systems | Select when long-term stability (15 ppm/1000 h) outweighs quiescent power constraints |
Compared with ADR3440ARJZ-R7 and MAX6126AASA41+T, REF198FS-REEL uniquely balances ultra-low IQ (45 μA), integrated SLEEP control, and 5 ppm/°C tempco in SOIC-8-making it optimal for space- and energy-constrained portable instrumentation where both precision and power-state agility are required.
Availability
REF198FS-REEL is available at Aetrix Electronics and suitable for portable instrumentation, high-resolution data acquisition, and solar-powered remote sensors requiring stable component supply with guaranteed long-term availability and traceable lot control.
Supply support for REF198FS-REEL 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
Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision measurement, industrial automation, and communications markets since 1965.
The REF19x series was designed specifically for micropower, low-dropout precision reference needs in battery-operated and thermally demanding environments-emphasizing accuracy retention across wide temperature ranges and minimal board-space footprint.
FAQ
What is the nominal output voltage of the REF198FS-REEL?
The REF198FS-REEL provides a nominal output voltage of 4.096 V, selected to align precisely with 12-bit digital systems (212 = 4096) and simplify full-scale scaling in ADCs and DACs. This value is laser-trimmed and specified with ±2 mV initial accuracy over temperature, ensuring consistent performance without external calibration in most embedded measurement applications.
Does the REF198FS-REEL require an output bypass capacitor?
Yes, the REF198FS-REEL requires a minimum 1 μF ceramic capacitor connected between the OUTPUT and GND pins for stability and noise reduction. This capacitor mitigates high-frequency oscillation and improves transient response during load steps. The datasheet specifies this as mandatory-not optional-for all operating conditions, including sleep mode transitions and line/load regulation testing.
What is the minimum supply voltage needed for the REF198FS-REEL to regulate at full load?
The REF198FS-REEL requires a minimum supply voltage of 4.196 V (i.e., 4.096 V + 100 mV headroom) to maintain regulation at zero load. At 20 mA output current, the maximum dropout voltage is 1.45 V, so VS must be ≥5.546 V. This low-headroom capability enables operation from single Li-ion cells (3.0–4.2 V) only when paired with a boost converter or used in pre-regulated subsystems.
How does the SLEEP pin function on the REF198FS-REEL?
The SLEEP pin on the REF198FS-REEL is a digital enable input: a logic low (≤0.8 V) disables the output and reduces supply current to ≤15 μA, while a logic high (≥2.4 V) enables normal operation at ≤45 μA. It accepts standard TTL/CMOS levels and draws ≤8 μA leakage current in either state-enabling direct interface with microcontrollers without level-shifting or additional drivers.
Is the REF198FS-REEL suitable for automotive applications?
Yes, the REF198FS-REEL is qualified for extended industrial temperature operation (−40°C to +85°C) and characterized up to +125°C, making it suitable for under-hood and cabin automotive subsystems such as battery monitoring, sensor signal conditioning, and infotainment power management. Its 5 ppm/°C max tempco, 1.2 mV/1000 h long-term stability, and robust short-circuit protection meet key AEC-Q100 stress requirements for non-safety-critical modules.
REF198FS-REEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- REF19
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Reference Type:
- Series
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 4.096V
- Voltage - Output (Max):
- -
- Current - Output:
- 30 mA
- Tolerance:
- ±0.12%
- Temperature Coefficient:
- 10ppm/°C
- Noise - 0.1Hz to 10Hz:
- 40µVp-p
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- 4.5V ~ 15V
- Current - Supply:
- 45µA
- Current - Cathode:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
REF198FS-REEL FAQ
1.How can I place an order for REF198FS-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for REF198FS-REEL 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 REF198FS-REEL reliable?
The price and inventory of REF198FS-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for REF198FS-REEL is usually 5 days.
3.What payment methods are accepted for REF198FS-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for REF198FS-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for REF198FS-REEL?
REF198FS-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your REF198FS-REEL 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 REF198FS-REEL?
For technical support, including REF198FS-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your REF198FS-REEL requirements.
6.How does Aetrix verify that REF198FS-REEL is sourced from the original manufacturer or authorized distributors?
All REF198FS-REEL 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 REF198FS-REEL meets industry standards.
7.What is the process for return or replacement of REF198FS-REEL?
All REF198FS-REEL units undergo pre-shipment inspection (PSI). If there is an issue with REF198FS-REEL, 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 REF198FS-REEL part is unused and in its original packaging.
Return procedure for REF198FS-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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