ZXRE4041DRSTOB Equivalent & Substitute Parts

Part Overview

The ZXRE4041DRSTOB is a shunt voltage reference IC manufactured by Diodes Incorporated, designed to provide a fixed 1.225V output with ±1% tolerance. This component is classified as obsolete, with 756 pieces currently in stock. The part operates across a temperature range of -40°C to 125°C and delivers 12 mA output current, making it suitable for precision voltage reference applications in power management circuits.

Due to its obsolete status, identifying equivalent substitute parts is essential for design continuity and long-term supply chain reliability. Active alternatives with compatible electrical characteristics are available from both Diodes Incorporated and Texas Instruments.

Key Parameters

Parameter	Value
Reference Type	Shunt
Output Type	Fixed
Voltage - Output (Min/Fixed)	1.225V
Current - Output	12 mA
Tolerance	±1%
Temperature Coefficient	100ppm/°C
Noise - 10Hz to 10kHz	60µVrms
Current - Cathode	30 µA
Operating Temperature	-40°C ~ 125°C (TA)
Mounting Type	Through Hole
Package / Case	E-Line-3 (TO-92 compatible)
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the ZXRE4041DRSTOB is determined by the following critical parameters:

Fixed output voltage of 1.225V
Output current capability of 12 mA
Tolerance specification of ±1%
Temperature coefficient of 100ppm/°C or better
Operating temperature range of -40°C to 125°C
Shunt reference type with fixed output configuration

Substitute parts are grouped into two categories based on mounting technology: surface mount alternatives (SOT-23-3 package) and through-hole alternatives (TO-92-3 package). All identified substitutes maintain the core electrical specifications required for functional equivalence.

Parameter Comparison

Parameter	ZXRE4041DRSTOB	ZXRE4041DFTA	LM4041C12ILPR	LM4041D12ILPR
Manufacturer	Diodes Incorporated	Diodes Incorporated	Texas Instruments	Texas Instruments
Product Status	Obsolete	Active	Active	Active
Voltage - Output (Min/Fixed)	1.225V	1.225V	1.225V	1.225V
Current - Output	12 mA	12 mA	12 mA	12 mA
Tolerance	±1%	±1%	±0.5%	±1%
Temperature Coefficient	100ppm/°C	100ppm/°C	100ppm/°C	150ppm/°C
Noise - 10Hz to 10kHz	60µVrms	60µVrms	20µVrms	20µVrms
Current - Cathode	30 µA	30 µA	80 µA	80 µA
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 85°C	-40°C ~ 85°C
Mounting Type	Through Hole	Surface Mount	Through Hole	Through Hole
Package / Case	E-Line-3 (TO-92 compatible)	SOT-23-3	TO-92-3	TO-92-3
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

ZXRE4041DFTA (Diodes Incorporated, SOT-23-3): This is the manufacturer-recommended surface mount alternative. It maintains identical electrical specifications to the ZXRE4041DRSTOB, including 1.225V output, ±1% tolerance, 100ppm/°C temperature coefficient, and full -40°C to 125°C operating range. The part is active with 28,213 units in stock. Selection of this part requires PCB redesign to accommodate the SOT-23-3 surface mount package.

LM4041C12ILPR (Texas Instruments, TO-92-3): This through-hole alternative offers superior tolerance performance at ±0.5% and lower noise characteristics (20µVrms versus 60µVrms). However, the operating temperature range is limited to -40°C to 85°C, which does not cover the full temperature specification of the original part. This part is suitable only for applications where the reduced temperature range is acceptable. The part is active with 3,546 units in stock.

LM4041D12ILPR (Texas Instruments, TO-92-3): This through-hole alternative maintains ±1% tolerance matching the original specification. The operating temperature range is limited to -40°C to 85°C. The temperature coefficient is 150ppm/°C, which is higher than the original 100ppm/°C specification. This part is active with 3,103 units in stock and is suitable for applications where the reduced temperature range and higher temperature coefficient are acceptable.

For applications requiring the full -40°C to 125°C operating range with through-hole mounting, the ZXRE4041DRSTOB remains the only option among the identified substitutes. For new designs, ZXRE4041DFTA is the recommended path forward with surface mount technology.

Frequently Asked Questions (FAQ)

Q: Can ZXRE4041DFTA be used as a direct replacement for ZXRE4041DRSTOB?

A: ZXRE4041DFTA is electrically equivalent with identical output voltage, current, tolerance, and temperature coefficient specifications. However, it uses a different package (SOT-23-3 surface mount versus E-Line-3 through-hole), requiring PCB layout modifications. Both parts are ROHS3 compliant and operate across -40°C to 125°C.

Q: What are the limitations of the Texas Instruments LM4041 series substitutes?

A: Both LM4041C12ILPR and LM4041D12ILPR have a reduced operating temperature range of -40°C to 85°C compared to the original -40°C to 125°C specification. Applications requiring operation above 85°C cannot use these parts. The LM4041D12ILPR also has a higher temperature coefficient (150ppm/°C versus 100ppm/°C).

Q: Which substitute offers the best noise performance?

A: Both Texas Instruments parts (LM4041C12ILPR and LM4041D12ILPR) provide superior noise performance at 20µVrms compared to 60µVrms for the original and Diodes Incorporated substitute. This lower noise may be beneficial for precision analog applications.

Q: Are all substitutes RoHS compliant?

A: Yes, all identified substitutes (ZXRE4041DFTA, LM4041C12ILPR, and LM4041D12ILPR) are ROHS3 compliant and REACH unaffected, matching the compliance status of the original ZXRE4041DRSTOB.

Q: What is the cathode current difference between substitutes?

A: The original ZXRE4041DRSTOB and ZXRE4041DFTA specify 30 µA cathode current, while both Texas Instruments parts specify 80 µA. This higher cathode current in the LM4041 series may affect circuit design considerations for low-power applications.

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