ZRC500A01 Equivalent & Substitute Parts

Part Overview

The ZRC500A01 is a shunt voltage reference IC manufactured by Diodes Incorporated, designed to provide a fixed 5V output with ±1% tolerance. This component operates as a precision voltage reference in power management applications. The ZRC500A01 is classified as obsolete, making identification of active equivalent and substitute parts essential for ongoing design support and procurement continuity. Substitute parts must maintain electrical compatibility across key parameters including output voltage, tolerance, temperature coefficient, and noise characteristics while accommodating different packaging and mounting technologies.

Key Parameters

Parameter	Value	Unit
Reference Type	Shunt	—
Output Type	Fixed	—
Voltage - Output (Fixed)	5V	V
Current - Output	5 mA	mA
Tolerance	±1%	—
Temperature Coefficient	90 ppm/°C	ppm/°C
Noise (10Hz to 10kHz)	105 µVrms	µVrms
Current - Cathode	25 µA	µA
Operating Temperature	-40°C to 85°C	°C
Mounting Type	Through Hole	—
Package / Case	E-Line-3 (TO-92 compatible)	—
Product Status	Obsolete	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the ZRC500A01 is determined by strict electrical and mechanical compatibility across the following critical parameters:

Electrical Compatibility Criteria:

Fixed 5V output voltage (non-negotiable)
Shunt reference type (non-negotiable)
Tolerance specification (±1% or better)
Temperature coefficient within acceptable range (90–150 ppm/°C)
Noise performance (10Hz to 10kHz: ≤105 µVrms or better)
Current output capability (≥5 mA minimum)
Operating temperature range (-40°C to 85°C minimum)

Mechanical Compatibility Criteria:

Through-hole or surface-mount packaging options
Pin-compatible or functionally equivalent package types
RoHS3 compliance maintained

Substitute Parts Identified:

ZRC500F01TA (Diodes Incorporated) – Active product, surface-mount SOT-23-3 alternative with identical electrical specifications
LM4040AIZ-5.0/NOPB (Texas Instruments) – Active product, through-hole TO-92-3, superior tolerance (±0.1%), higher output current (15 mA)
LM4040C50ILP (Texas Instruments) – Active product, through-hole TO-92-3, ±0.5% tolerance, higher output current (15 mA)
LM4040C50ILPE3 (Texas Instruments) – Active product, through-hole TO-92-3, ±0.5% tolerance, higher output current (15 mA)
LM4040DIZ-5.0/NOPB (National Semiconductor) – Active product, through-hole TO-92-3, ±1% tolerance, higher output current (15 mA)

Parameter Comparison

Parameter	ZRC500A01	ZRC500F01TA	LM4040AIZ-5.0/NOPB	LM4040C50ILP	LM4040C50ILPE3	LM4040DIZ-5.0/NOPB
Manufacturer	Diodes Inc.	Diodes Inc.	Texas Instruments	Texas Instruments	Texas Instruments	National Semiconductor
Reference Type	Shunt	Shunt	Shunt	Shunt	Shunt	Shunt
Output Voltage	5V	5V	5V	5V	5V	5V
Output Current	5 mA	5 mA	15 mA	15 mA	15 mA	15 mA
Tolerance	±1%	±1%	±0.1%	±0.5%	±0.5%	±1%
Temperature Coefficient	90 ppm/°C	90 ppm/°C	100 ppm/°C	100 ppm/°C	100 ppm/°C	150 ppm/°C
Noise (10Hz–10kHz)	105 µVrms	105 µVrms	80 µVrms	80 µVrms	80 µVrms	80 µVrms
Cathode Current	25 µA	25 µA	80 µA	95 µA	95 µA	85 µA
Operating Temperature	-40°C to 85°C	-40°C to 85°C	-40°C to 85°C	-40°C to 85°C	-40°C to 85°C	-40°C to 85°C
Mounting Type	Through Hole	Surface Mount	Through Hole	Through Hole	Through Hole	Through Hole
Package	E-Line-3 (TO-92)	SOT-23-3	TO-92-3	TO-92-3	TO-92-3	TO-92-3
Product Status	Obsolete	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Through-Hole Replacement (Same Mounting Technology):

Select from LM4040AIZ-5.0/NOPB, LM4040C50ILP, LM4040C50ILPE3, or LM4040DIZ-5.0/NOPB. All maintain TO-92-3 through-hole packaging and -40°C to 85°C operating range. LM4040AIZ-5.0/NOPB offers superior tolerance (±0.1%) and lower noise (80 µVrms). LM4040DIZ-5.0/NOPB matches the original ±1% tolerance specification. All substitute parts provide higher output current (15 mA vs. 5 mA), which is compatible with applications designed for the ZRC500A01.

For Surface-Mount Technology Migration:

ZRC500F01TA provides an active, surface-mount alternative from the same manufacturer (Diodes Incorporated) with identical electrical specifications (±1% tolerance, 90 ppm/°C temperature coefficient, 105 µVrms noise). This part is suitable for PCB redesigns requiring SMD components and maintains full electrical compatibility.

Compliance and Availability:

All substitute parts are active products with ROHS3 compliance and REACH unaffected status, ensuring regulatory compliance and long-term procurement availability. Inventory levels are substantial across all alternatives, supporting production continuity.

Frequently Asked Questions (FAQ)

Q: Can LM4040 series parts directly replace the ZRC500A01?

A: Yes. LM4040 series parts (LM4040AIZ-5.0/NOPB, LM4040C50ILP, LM4040C50ILPE3, LM4040DIZ-5.0/NOPB) are electrically compatible substitutes. All maintain 5V fixed output, -40°C to 85°C operating range, and TO-92-3 through-hole packaging. Higher output current (15 mA vs. 5 mA) is compatible with existing designs.

Q: What is the difference between ±1%, ±0.5%, and ±0.1% tolerance options?

A: Tolerance specifies the maximum deviation of output voltage from the nominal 5V value. ±1% allows ±50 mV deviation; ±0.5% allows ±25 mV; ±0.1% allows ±5 mV. Applications requiring tighter voltage regulation should select lower tolerance values. The ZRC500A01 specifies ±1%, which is matched by ZRC500F01TA and LM4040DIZ-5.0/NOPB.

Q: Is ZRC500F01TA suitable for through-hole PCB designs?

A: No. ZRC500F01TA uses SOT-23-3 surface-mount packaging and is designed for SMD assembly. For through-hole designs, select LM4040AIZ-5.0/NOPB, LM4040C50ILP, LM4040C50ILPE3, or LM4040DIZ-5.0/NOPB, which all use TO-92-3 through-hole packaging.

Q: Why do substitute parts have higher output current (15 mA vs. 5 mA)?

A: Higher output current capability is a design improvement in the LM4040 series and does not affect compatibility. Applications designed for 5 mA operation will function correctly with parts rated for 15 mA. The higher rating provides additional design margin and flexibility for future modifications.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All identified substitute parts (ZRC500F01TA, LM4040AIZ-5.0/NOPB, LM4040C50ILP, LM4040C50ILPE3, LM4040DIZ-5.0/NOPB) are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.

Q: What is the significance of temperature coefficient differences (90 ppm/°C vs. 100 ppm/°C vs. 150 ppm/°C)?

A: Temperature coefficient specifies output voltage drift per degree Celsius change. Lower values indicate better temperature stability. The ZRC500A01 specifies 90 ppm/°C. LM4040 series parts range from 100–150 ppm/°C, representing minimal performance variation suitable for most applications. Applications requiring the lowest temperature drift should prioritize ZRC500F01TA (90 ppm/°C) or LM4040AIZ-5.0/NOPB (100 ppm/°C).

Q: Can I use these parts interchangeably in existing designs without PCB modification?

A: Through-hole substitutes (LM4040 series in TO-92-3) are pin-compatible with the ZRC500A01 E-Line-3 package and require no PCB modification. ZRC500F01TA (SOT-23-3) requires PCB redesign due to different package footprint and pin configuration.

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