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Analog Devices Inc. REF195ESZ-REEL
- Part No.:
- REF195ESZ-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
REF195ESZ-REEL.pdf
- Description:
- IC VREF SERIES 0.04% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:8,603
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Product details
Overview
REF195ESZ-REEL from Analog Devices is a precision micropower low-dropout (LDV) voltage reference IC delivering a stable 5.00 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 and solar-powered instrumentation.
For engineers reviewing the REF195ESZ-REEL datasheet, REF195ESZ-REEL pinout, REF195ESZ-REEL application, or REF195ESZ-REEL equivalent, key selection criteria include dropout voltage ≤0.50 V at 10 mA load, sleep-mode current ≤15 μA, and guaranteed operation across −40°C to +85°C industrial temperature range.
Technical Context
The REF195ESZ-REEL uses a patented curvature-corrected band gap core with laser-trimmed thin-film resistors to achieve low drift and high initial accuracy. Its LDV architecture enables regulation from supplies as low as 100 mV above the 5.00 V output.
Sleep mode is controlled via a TTL/CMOS-compatible SLEEP pin (logic low disables output and reduces supply current to ≤15 μA), while internal short-circuit protection and 1 μF output bypassing ensure robust operation in low-power sensor and loop-powered systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Output Voltage | 5.00 V - precisely trimmed output for 5 V ADC reference rails and DAC full-scale calibration. |
| Initial Accuracy | ±2 mV maximum at 25°C - enables 16-bit system accuracy without post-calibration in precision data acquisition. |
| Tempco | 5 ppm/°C maximum (E grade) - ensures ≤0.75 mV drift over −40°C to +85°C ambient, critical for field-deployed instruments. |
| Dropout Voltage | 0.50 V at 10 mA load - allows operation from 5.5 V supply, supporting single-cell Li-ion or regulated 5.5 V rails. |
| Supply Current | 45 μA maximum - enables multi-year battery life in portable sensors and wireless transmitters. |
| Sleep Mode Current | 15 μA maximum - facilitates ultra-low-power duty-cycled operation in energy-harvesting nodes. |
| Noise (0.1–10 Hz) | 50 μV p-p - supports <18-bit effective resolution in high-dynamic-range measurement front-ends. |
Pinout & Package
REF195ESZ-REEL is housed in an 8-lead SOIC_N (SOIC-8 narrow-body) package with exposed pad (suffix 'ESZ' per Analog Devices ordering guide). Pin 1 and Pin 5 are factory test points (TP) and must remain unconnected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (TP) | Factory Zener trim point | Internally connected to trimming network; no user connection - floating or tied to GND degrades accuracy. |
| 2 (VS) | Positive supply input | Accepts 5.10 V to 15 V; dropout as low as 0.50 V enables efficient use of marginally regulated supplies. |
| 3 (SLEEP) | Digital enable control | TTL/CMOS-compatible input; logic low disables output and reduces IQ to ≤15 μA for power gating. |
| 4 (GND) | Analog ground reference | Primary return path for reference output and supply current; requires low-impedance connection to system AGND. |
| 5 (TP) | Factory Zener trim point | Second trim node; electrically isolated from user circuitry - must be left open or NC. |
| 6 (NC) | No connect | Internally unconnected; no routing or copper pour required under this pad. |
| 7 (NC) | No connect | Internally unconnected; PCB layout may omit trace or pad. |
| 8 (OUTPUT) | Precision 5.00 V output | Delivers up to 30 mA; requires 1 μF ceramic capacitor to GND for stability and noise reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Curvature-corrected band gap | Reduces parabolic temperature drift, enabling 5 ppm/°C max tempco without external compensation. |
| Laser-trimmed thin-film resistors | Ensures ±2 mV initial accuracy and long-term stability of 1.2 mV over 1000 hours at 125°C. |
| Low-dropout (LDV) architecture | Regulates from supplies only 100 mV above 5.00 V output - ideal for battery-powered systems with shrinking headroom. |
| Sleep mode with digital control | Reduces quiescent current from 45 μA to ≤15 μA via logic-level SLEEP pin, enabling microcontroller-gated power management. |
| Short-circuit protected output | Withstands indefinite output-to-GND faults without damage or parameter shift, improving field reliability. |
Applications
| Portable Instrumentation | High-Resolution ADC Reference |
|---|---|
Use Scenario: Handheld multimeters and portable gas analyzers operating on two AA cells (3.0 V nominal) with boost-regulated 5.5 V rail. IC Role / Device Role / Timing Role: Primary 5.00 V reference for 24-bit sigma-delta ADC, providing full-scale calibration point. Use Value: 0.50 V dropout allows regulation from 5.5 V supply; 5 ppm/°C tempco maintains <0.01% reading error across operating temperature. |
Use Scenario: Industrial process controller digitizing 4–20 mA loop signals with 18-bit SAR ADC. IC Role / Device Role / Timing Role: Stable reference source for ADC conversion, directly determining measurement resolution and linearity. Use Value: ±2 mV initial accuracy and 50 μV p-p low-frequency noise support >17.5 ENOB in DC-coupled measurements. |
| Smart Sensor Transmitter | Solar-Powered Remote Monitor |
Use Scenario: Wireless pressure sensor node powered by coin cell, transmitting via BLE every 10 seconds. IC Role / Device Role / Timing Role: Bias reference for bridge amplifier and ADC during active measurement burst. Use Value: Sleep mode reduces average current to <1 μA; 45 μA active supply enables fast wake-up and measurement completion in <5 ms. |
Use Scenario: Environmental sensor node harvesting energy from small solar panel, storing in supercapacitor. IC Role / Device Role / Timing Role: Precision reference for ADC measuring photodiode, thermistor, and humidity sensor outputs. Use Value: Operation down to 5.10 V supply accommodates variable supercapacitor voltage; 1.2 mV long-term drift ensures calibration validity over 5+ years. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADR4550BRZ-R7 | 5.0 V, 3 ppm/°C max tempco, 950 μA supply current, no sleep mode | Higher power, higher accuracy; suited for mains-powered lab equipment, not battery-constrained nodes | Select when ultra-low drift outweighs quiescent current; avoid where sleep gating or micropower is mandatory. |
| MAX6126AASA50+ | 5.0 V, 6 ppm/°C max tempco, 120 μA supply current, fixed 5-pin SOT23 package | Smaller footprint but higher IQ; lacks SLEEP pin and adjustable shutdown control | Choose for space-constrained designs accepting higher current; not suitable for dynamic power cycling. |
Compared with REF195ESZ-REEL, ADR4550BRZ-R7 offers superior temperature stability but consumes 21× more supply current and lacks sleep control, while MAX6126AASA50+ trades 20% higher drift and no sleep capability for 30% smaller board area - making REF195ESZ-REEL optimal for battery- or energy-harvesting–powered precision analog systems requiring both accuracy and ultra-low power.
Availability
REF195ESZ-REEL is available at Aetrix Electronics and suitable for portable instrumentation, high-resolution ADC reference, and solar-powered remote monitoring requiring stable component supply with guaranteed long-term availability and consistent parametric performance.
Supply support for REF195ESZ-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, headquartered in Norwood, MA, with design and manufacturing expertise spanning over 50 years.
The REF19x series was developed to address demand for micropower, low-dropout precision references in portable, loop-powered, and energy-constrained industrial sensing applications - emphasizing accuracy retention across wide temperature ranges and minimal supply overhead.
FAQ
What is the minimum supply voltage required for stable operation of the REF195ESZ-REEL?
The REF195ESZ-REEL requires a minimum supply voltage of 5.50 V to maintain regulation at 10 mA load, as specified by its 0.50 V dropout voltage. At lighter loads, it can operate with as little as 100 mV headroom above 5.00 V - meaning 5.10 V is sufficient for no-load or microamp-level output currents. This low-dropout behavior is critical for battery-powered systems where supply voltage sags over time.
How does the SLEEP pin function on the REF195ESZ-REEL, and what is its logic threshold?
The SLEEP pin on the REF195ESZ-REEL is TTL/CMOS-compatible: 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 with ≤45 μA supply current. Input leakage is ≤8 μA magnitude in either state. This pin enables precise microcontroller-driven power gating without external switches or regulators.
Is an output capacitor required for the REF195ESZ-REEL, and if so, what value and type?
Yes - a 1 μF ceramic capacitor is required between the OUTPUT and GND pins of the REF195ESZ-REEL for stability and noise reduction, as explicitly stated in the datasheet. X7R or C0G dielectrics are recommended. Omitting this capacitor risks oscillation, increased output noise, and degraded load regulation - especially under dynamic load conditions common in ADC sampling circuits.
What is the guaranteed temperature coefficient specification for the REF195ESZ-REEL over its full operating range?
The REF195ESZ-REEL (E grade) guarantees a maximum temperature coefficient of 5 ppm/°C over the extended industrial range of −40°C to +85°C. At 25°C, typical performance is 2 ppm/°C. Over −40°C to +125°C, the max spec remains 5 ppm/°C for E grade - confirmed in Table 16 of the Rev. L datasheet - ensuring predictable drift in automotive under-hood or industrial edge-node deployments.
Can the REF195ESZ-REEL drive a 30 mA load while maintaining its specified accuracy?
Yes - the REF195ESZ-REEL is rated for up to 30 mA output current while maintaining its specified load regulation of 4 ppm/mA (E grade, 25°C). At 30 mA, this equates to ≤0.06 mV deviation from nominal 5.00 V, well within the ±2 mV initial accuracy band. The device also includes internal short-circuit protection, allowing safe operation even under sustained overload or fault conditions.
REF195ESZ-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:
- Active
- Reference Type:
- Series
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Current - Output:
- 30 mA
- Tolerance:
- ±0.04%
- Temperature Coefficient:
- 5ppm/°C
- Noise - 0.1Hz to 10Hz:
- 50µVp-p
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- 5.1V ~ 15V
- Current - Supply:
- 45µA
- Current - Cathode:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
REF195ESZ-REEL FAQ
1.How can I place an order for REF195ESZ-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for REF195ESZ-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 REF195ESZ-REEL reliable?
The price and inventory of REF195ESZ-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for REF195ESZ-REEL is usually 5 days.
3.What payment methods are accepted for REF195ESZ-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for REF195ESZ-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for REF195ESZ-REEL?
REF195ESZ-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your REF195ESZ-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 REF195ESZ-REEL?
For technical support, including REF195ESZ-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your REF195ESZ-REEL requirements.
6.How does Aetrix verify that REF195ESZ-REEL is sourced from the original manufacturer or authorized distributors?
All REF195ESZ-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 REF195ESZ-REEL meets industry standards.
7.What is the process for return or replacement of REF195ESZ-REEL?
All REF195ESZ-REEL units undergo pre-shipment inspection (PSI). If there is an issue with REF195ESZ-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 REF195ESZ-REEL part is unused and in its original packaging.
Return procedure for REF195ESZ-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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