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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Reference

Diodes Incorporated ZRT025N8A1TA

Name: ZRT025N8A1TA
Brand: Diodes Incorporated
SKU: ZRT025N8A1TA
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ZRT025N8A1TA

Manufacturer:: Diodes Incorporated

Category:: Voltage Reference

Package:: 8-SOIC (0.154", 3.90mm Width)

Datasheet:: ZRT025N8A1TA.pdf

Description:: IC VREF SHUNT 1% 8SOP

Quantity:: RFQ Add To RFQ list

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Product details

Overview

ZRT025N8A1TA from Zetex Semiconductors (now Diodes Incorporated) is a precision 2.5V bandgap voltage reference IC with 1% initial tolerance, specified for -55°C to +125°C operation in SO8 package. It delivers stable 2.5V output at 500µA, features 65% trim range via external 100kΩ resistor, 15 ppm/°C typical temperature coefficient, and 0.85Ω slope resistance - used in high-accuracy ADC/DAC biasing and sensor signal conditioning circuits.

For engineers reviewing the ZRT025N8A1TA datasheet, ZRT025N8A1TA pinout, ZRT025N8A1TA application, or ZRT025N8A1TA equivalent, key selection criteria include trim-enabled calibration capability, low-noise (50µV_p-p, 0.1–10Hz), wide operating current (150µA–75mA), no external capacitor requirement, and SO8 package compatibility with automated SMT assembly.

Technical Context

The ZRT025N8A1TA implements a monolithic bandgap reference core with integrated trim node, enabling precise post-assembly adjustment of output voltage across ±12.5% (65% total range) using an external 100kΩ potentiometer. Its low 0.85Ω slope resistance ensures minimal load regulation error over 0.5–5mA current variation.

Designed for harsh environments, it maintains 15 ppm/°C typical TCVR and ≤22.5mV total output drift over -55°C to +125°C (Grade A), with no derating required below 72°C and full 300mW power dissipation capability at 25°C ambient.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	2.500 V ±1% at 500µA - enables direct interface with 2.5V-input SAR ADCs without scaling.
Temp Coefficient (TCVR)	15 ppm/°C typ, 50 ppm/°C max - supports <±0.1% full-scale error in industrial temperature ranges.
Trim Range	65% (±12.5% around 2.5V) with 100kΩ - allows system-level calibration to compensate for PCB trace resistance and DAC offset.
Noise (0.1–10Hz)	50 µV_p-p - avoids quantization noise floor elevation in 16-bit+ data acquisition systems.
Slope Resistance	0.85 Ω typ - limits output voltage shift to <4.3mV under 5mA load change, critical for ratiometric sensor bridges.
Operating Current	150µA min (knee current), 75mA max - supports ultra-low-power sleep modes and high-current buffer drive simultaneously.
Package	SO8 (suffix N8), lead-free, RoHS-compliant - compatible with IPC-A-610 Class 2 reflow profiles and AOI inspection.

Pinout & Package

SO8 package (suffix N8); 8-pin small-outline integrated circuit with exposed thermal pad (not electrically connected). Pin 4 is floating or internally tied to Pin 2 per Zetex documentation; case not connected.

Pin/Terminal	Circuit Role	Design Meaning
Pin 1	Input (V_CC)	Unregulated supply input; must exceed 2.5V by ≥1.5V for stable regulation under full load.
Pin 2	Output (V_R)	Precision 2.5V reference output; low-impedance node requiring local 100nF ceramic decoupling.
Pin 3	Ground	Analog ground return; must be star-connected to minimize ground bounce in mixed-signal systems.
Pin 4	Trim (RT)	Adjustment node; open-circuit when unused; connects to wiper of 100kΩ potentiometer for ±12.5% output tuning.
Pins 5–8	No Connect / Thermal Pad	Unused pins; thermal pad improves power dissipation but is electrically isolated per datasheet Fig. 4-281.

Key Features

Feature	Design Value
Trimmable output	65% total adjustment range via single external resistor - eliminates need for laser trimming during production test.
Low slope resistance	0.85Ω typical - reduces load-induced error to <1 LSB in 16-bit 2.5V-referenced ADCs at 5mA load swing.
No external capacitor required	Stable with capacitive loads up to 10nF - simplifies layout in space-constrained sensor modules.
Wide temperature range	-55°C to +125°C Grade A operation - qualified for automotive engine control units and downhole instrumentation.
Low output noise	50µV_p-p (0.1–10Hz) - preserves dynamic range in precision weigh scale and medical ECG front-ends.

Applications

High-Accuracy Data Acquisition

Automotive Engine Control Unit

Use Scenario: 24-bit sigma-delta ADC measuring thermocouple voltage in laboratory DAQ systems.

IC Role / Device Role / Timing Role: Primary voltage reference for ADC internal conversion core and external PGA gain-setting resistors.

Use Value: 15 ppm/°C TCVR and 50µV_p-p noise ensure <±0.005% full-scale error across 0–50°C lab environment.

Use Scenario: Reference for oxygen sensor (lambda) signal conditioning in exhaust manifold-mounted ECU.

IC Role / Device Role / Timing Role: Stable 2.5V bias for op-amp-based transimpedance amplifier converting Nernst cell current.

Use Value: -55°C to +125°C Grade A rating and 65% trim range enable field calibration after thermal aging of exhaust components.

Industrial Pressure Transmitter

Medical Patient Monitor Analog Front-End

Use Scenario: 4–20mA loop-powered pressure transmitter with HART digital overlay.

IC Role / Device Role / Timing Role: Reference for 12-bit DAC generating loop current setpoint and for bridge excitation in piezoresistive sensor.

Use Value: 0.85Ω slope resistance prevents >0.5mV error during 4–20mA span adjustment; no external cap saves board area in sealed housing.

Use Scenario: Biopotential amplifier chain in portable ECG device with 16-bit ADC sampling at 1kHz.

IC Role / Device Role / Timing Role: Low-noise reference for ADC and analog comparator triggering arrhythmia detection thresholds.

Use Value: 50µV_p-p noise avoids false positives in ST-segment analysis; SO8 package supports automated assembly for high-volume production.

Equivalent & Alternatives

The following parts are listed as comparable options for similar precision voltage reference applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
REF02CP	2.5V, 1% tol, TO-99 metal can, 25 ppm/°C TCVR, no trim pin	Lacks adjustable output; requires tighter tolerance sourcing for system calibration	Choose when fixed-output stability suffices and through-hole mounting is preferred.
ADR3425ARJZ	2.5V, 0.1% tol, SOT23-5, 10 ppm/°C TCVR, no trim, 3.6µA quiescent current	Ultra-low IQ but no trim capability; limited to 10mA max load	Prefer for battery-powered devices needing highest initial accuracy but no field calibration.

Compared with REF02CP and ADR3425ARJZ, ZRT025N8A1TA uniquely combines SO8 SMT compatibility, user-adjustable output, and Grade A temperature performance - making it optimal for cost-sensitive industrial sensors requiring post-manufacture calibration.

Availability

ZRT025N8A1TA is available at Aetrix Electronics and suitable for high-accuracy data acquisition, automotive engine control units, and industrial pressure transmitters requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for ZRT025N8A1TA 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

Zetex Semiconductors, acquired by Diodes Incorporated in 2008, specialized in high-performance analog and discrete semiconductors for industrial and automotive markets.

ZRT025 belongs to Zetex's precision reference family designed specifically for applications demanding calibrated accuracy, wide-temperature stability, and field-adjustable output - notably sensor signal chains and closed-loop control systems.

FAQ

What is the function of Pin 4 (Trim) on ZRT025N8A1TA?

Pin 4 is the trim terminal, enabling output voltage adjustment across ±12.5% of nominal 2.5V using an external 100kΩ potentiometer. When unused, it must remain open-circuited per datasheet specification. This pin directly modulates the internal bandgap core's current ratio and does not require pull-up/down resistors.

Can ZRT025N8A1TA operate without an external capacitor?

Yes - the ZRT025N8A1TA is internally compensated and stable with capacitive loads up to 10nF. No external bypass capacitor is required for basic operation, though a 100nF X7R ceramic capacitor placed within 2mm of Pins 1 and 3 is recommended to suppress high-frequency supply noise in noisy industrial environments.

What is the maximum allowable input voltage for ZRT025N8A1TA?

The absolute maximum reverse current rating is 75mA, and the device requires a minimum headroom of 1.5V above 2.5V output for regulation. Therefore, maximum safe input is determined by power dissipation: at 25°C ambient, SO8 package limits continuous input to ≤5.5V at 500µA (1.5mW), or ≤4.0V at 75mA (112.5mW), respecting the 625mW SO8 power rating.

How does the 65% trim range translate to actual voltage adjustment?

The 65% trim range means the output can be adjusted over a total span equal to 65% of the nominal 2.5V value - i.e., ±12.5% (±0.3125V) around 2.5V, yielding a tunable range of 2.1875V to 2.8125V. This is achieved by connecting a 100kΩ potentiometer between Pins 1 and 4, with wiper to Pin 4, as shown in Figure 1 of the original datasheet.

ZRT025N8A1TA Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Package/Case:: 8-SOIC (0.154", 3.90mm Width)

Series:: -

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Reference Type:: Shunt

Output Type:: Fixed

Voltage - Output (Min/Fixed):: 2.5V

Voltage - Output (Max):: -

Current - Output:: 75 mA

Tolerance:: ±1%

Temperature Coefficient:: 50ppm/°C

Noise - 0.1Hz to 10Hz:: 50µVp-p

Noise - 10Hz to 10kHz:: -

Voltage - Input:: -

Current - Supply:: -

Current - Cathode:: 150 µA

Operating Temperature:: -55°C ~ 125°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-SO

ZRT025N8A1TA FAQ

1.How can I place an order for ZRT025N8A1TA through Aetrix?

Please submit a Request for Quotation (RFQ) for ZRT025N8A1TA 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 ZRT025N8A1TA reliable?

The price and inventory of ZRT025N8A1TA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZRT025N8A1TA is usually 5 days.

3.What payment methods are accepted for ZRT025N8A1TA?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZRT025N8A1TA transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ZRT025N8A1TA?

ZRT025N8A1TA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ZRT025N8A1TA 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 ZRT025N8A1TA?

For technical support, including ZRT025N8A1TA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZRT025N8A1TA requirements.

6.How does Aetrix verify that ZRT025N8A1TA is sourced from the original manufacturer or authorized distributors?

All ZRT025N8A1TA 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 ZRT025N8A1TA meets industry standards.

7.What is the process for return or replacement of ZRT025N8A1TA?

All ZRT025N8A1TA units undergo pre-shipment inspection (PSI). If there is an issue with ZRT025N8A1TA, 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 ZRT025N8A1TA part is unused and in its original packaging.

Return procedure for ZRT025N8A1TA:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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