ZRB500F03TC Equivalent & Substitute Parts

Part Overview

The ZRB500F03TC is a shunt voltage reference IC manufactured by Diodes Incorporated, providing a fixed 5V output with ±3% tolerance in a SOT-23-3 surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. The device operates across the industrial temperature range of -40°C to 85°C and delivers 15 mA output current with a 50 µA cathode current specification.

Key Parameters

Parameter	Value
Reference Type	Shunt
Output Voltage	5V Fixed
Output Current	15 mA
Tolerance	±3%
Temperature Coefficient	50 ppm/°C
Noise (10Hz to 10kHz)	105 µVrms
Cathode Current	50 µA
Operating Temperature	-40°C to 85°C
Package	SOT-23-3
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the ZRB500F03TC is determined by the following critical parameters:

Primary Substitution Criteria:

Output voltage: 5V fixed
Package type: SOT-23-3 (TO-236-3, SC-59)
Output current capability: 15 mA minimum
Surface mount mounting type
RoHS3 compliance

Secondary Compatibility Factors:

Tolerance specification (±3% or better)
Temperature coefficient stability
Operating temperature range (-40°C to 85°C minimum)
Noise performance (105 µVrms or lower at 10Hz to 10kHz)
Cathode current specifications

Substitute parts are grouped into two categories: parametric equivalents (matching all primary specifications) and manufacturer-recommended alternatives (offering improved performance characteristics while maintaining functional compatibility).

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Tolerance	Temp Coeff (ppm/°C)	Noise 10Hz-10kHz (µVrms)	Cathode Current (µA)	Temp Range (°C)	Product Status
ZRB500F03TC	Diodes Inc.	5V	±3%	50	105	50	-40 to 85	Obsolete
ZRB500F03TA	Diodes Inc.	5V	±3%	50	105	50	-40 to 85	Active
LM4040D50FTA	Diodes Inc.	5V	±1%	150	80	88	-40 to 125	Active
LM4040A50IDBZR	Texas Instruments	5V	±0.1%	100	80	95	-40 to 85	Active
LM4040A50IDBZT	Texas Instruments	5V	±0.1%	100	80	95	-40 to 85	Active
LM4040AEM3-5.0+T	Analog Devices Inc./Maxim	5V	±0.1%	100	80	80	-40 to 125	Active
ADR5045ARTZ-R2	Analog Devices Inc.	5V	±0.2%	100	280	60	-40 to 125	Discontinued
ADR5045ARTZ-REEL7	Analog Devices Inc.	5V	±0.2%	100	280	60	-40 to 125	Active
ADR5045BRTZ-REEL7	Analog Devices Inc.	5V	±0.1%	75	280	60	-40 to 125	Active

Engineering Selection Recommendations

Direct Parametric Equivalent: ZRB500F03TA is the primary replacement for ZRB500F03TC. Both parts share identical electrical specifications (5V output, ±3% tolerance, 50 ppm/°C temperature coefficient, 105 µVrms noise) and package configuration. The ZRB500F03TA maintains active product status with 5636 units in stock, ensuring supply continuity.

Enhanced Performance Alternatives: For applications requiring improved accuracy and extended temperature range, the LM4040 series (LM4040A50IDBZR, LM4040A50IDBZT, LM4040AEM3-5.0+T) and ADR5045 series (ADR5045ARTZ-REEL7, ADR5045BRTZ-REEL7) provide tighter tolerance specifications (±0.1% to ±0.2%) while maintaining the 5V output and SOT-23-3 package. These alternatives support operating temperatures to 125°C, exceeding the original part's -40°C to 85°C range.

Compliance Verification: All recommended substitutes maintain ROHS3 compliance and MSL Level 1 (unlimited moisture sensitivity). Parts are classified under HTSUS 8542.39.0001 and carry EAR99 ECCN designation, consistent with the original ZRB500F03TC specifications.

Inventory Availability: LM4040A50IDBZR offers the highest stock availability (999,200 units), followed by ADR5045ARTZ-REEL7 (36,120 units) and LM4040AEM3-5.0+T (20,400 units). ZRB500F03TA provides the closest parametric match with 5,636 units available.

Frequently Asked Questions (FAQ)

Q: Can ZRB500F03TA directly replace ZRB500F03TC without circuit modifications? A: Yes. ZRB500F03TA is a parametric equivalent with identical electrical specifications and SOT-23-3 packaging. No circuit modifications are required for direct substitution.

Q: What is the primary difference between the ZRB500F03TC and LM4040 series substitutes? A: The LM4040 series offers significantly tighter tolerance (±0.1% versus ±3%), lower noise performance (80 µVrms versus 105 µVrms), and extended operating temperature range (-40°C to 85°C or 125°C). These improvements come with higher cathode current requirements (95 µA versus 50 µA).

Q: Are ADR5045 parts suitable replacements despite different noise specifications? A: ADR5045 parts maintain the 5V output and SOT-23-3 package but exhibit higher noise levels (280 µVrms versus 105 µVrms). Selection depends on application noise sensitivity. For noise-critical applications, LM4040 series is preferred.

Q: Does the extended temperature range of substitute parts affect circuit design? A: No. Extended temperature range (-40°C to 125°C) provides additional operational margin without requiring design changes. Circuits designed for -40°C to 85°C operation remain fully compatible.

Q: What packaging options are available for substitute parts? A: All substitutes maintain SOT-23-3 surface mount packaging (TO-236-3, SC-59 designations). Packaging variants include Cut Tape (CT), Digi-Reel, and Tape & Reel (TR) options. Verify specific packaging requirements with supplier documentation.

Q: Are there any supply chain advantages to selecting one substitute over another? A: LM4040A50IDBZR offers exceptional availability (999,200 units in stock), making it optimal for high-volume production. ZRB500F03TA provides the closest parametric match with adequate inventory (5,636 units). ADR5045ARTZ-REEL7 balances performance and availability (36,120 units).

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