ZXRE252ASA-7 Equivalent & Substitute Parts

Part Overview

The ZXRE252ASA-7 is a shunt voltage reference IC manufactured by Diodes Incorporated, designed for adjustable precision voltage reference applications. This component operates with a 2.5V adjustable output, supports up to 36V maximum voltage, and delivers 100 mA output current with ±1% tolerance. The device is packaged in SOT-23-3 surface mount configuration and operates across the -40°C to 125°C temperature range.

The ZXRE252ASA-7 carries a "Not For New Designs" product status, indicating it is obsolete or being phased out. Identifying equivalent substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements.

Key Parameters

Parameter	Value
Reference Type	Shunt
Output Type	Adjustable
Voltage - Output (Min/Fixed)	2.5V
Voltage - Output (Max)	36V
Current - Output	100 mA
Tolerance	±1%
Operating Temperature	-40°C ~ 125°C
Package / Case	SOT-23-3
Mounting Type	Surface Mount
Current - Cathode	65 µA

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict alignment with the following critical parameters:

Reference Type: Must be Shunt
Output Type: Must be Adjustable
Voltage Range: Output minimum/fixed at 2.5V or compatible, maximum 36V
Current - Output: 100 mA
Package / Case: SOT-23-3 (TO-236-3, SC-59)
Mounting Type: Surface Mount
Operating Temperature: Must support -40°C ~ 125°C or equivalent range

All identified substitute parts meet these core electrical and mechanical requirements. Tolerance variations (±1% vs ±0.5%) and cathode current differences are secondary parameters that do not disqualify substitution but may affect circuit performance characteristics.

Parameter Comparison

Parameter	ZXRE252ASA-7	AP431SHANTR-G1	ATL432AQDBZR	ATL432AIDBZR	ATL432BIDBZR	TL431AMFDT,215
Manufacturer	Diodes Inc.	Diodes Inc.	Texas Instruments	Texas Instruments	Texas Instruments	NXP Semiconductors
Reference Type	Shunt	Shunt	Shunt	Shunt	Shunt	Shunt
Output Type	Adjustable	Adjustable	Adjustable	Adjustable	Adjustable	Adjustable
Voltage - Output (Min/Fixed)	2.5V	2.495V	2.5V	2.5V	2.5V	2.495V
Voltage - Output (Max)	36V	36V	36V	36V	36V	36V
Current - Output	100 mA	100 mA	100 mA	100 mA	100 mA	100 mA
Tolerance	±1%	±0.5%	±1%	±1%	±0.5%	±1%
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 125°C
Package / Case	SOT-23-3	SOT-23-3	SOT-23-3	SOT-23-3	SOT-23-3	SOT-23-3
Current - Cathode	65 µA	100 µA	35 µA	35 µA	80 µA	600 µA
Product Status	Not For New Designs	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

All substitute parts listed are ROHS3 compliant and carry Active product status, ensuring long-term availability and regulatory compliance.

Primary Substitutes (Identical Tolerance):

ATL432AQDBZR (Texas Instruments): Matches ±1% tolerance and full -40°C ~ 125°C operating range. Cathode current of 35 µA is lower than the original 65 µA, reducing quiescent current draw.
ATL432AIDBZR (Texas Instruments): Matches ±1% tolerance with 48 ppm/°C temperature coefficient. Operating range limited to -40°C ~ 85°C; suitable for applications not requiring full 125°C operation.
TL431AMFDT,215 (NXP Semiconductors): Matches ±1% tolerance and full -40°C ~ 125°C operating range. Cathode current of 600 µA is significantly higher; circuit design must accommodate increased quiescent current.

Enhanced Tolerance Substitute:

ATL432BIDBZR (Texas Instruments): Offers improved ±0.5% tolerance with 48 ppm/°C temperature coefficient. Operating range limited to -40°C ~ 85°C. Suitable for precision applications where tighter tolerance is beneficial.
AP431SHANTR-G1 (Diodes Incorporated): Offers improved ±0.5% tolerance with full -40°C ~ 125°C operating range. Cathode current of 100 µA is higher than original; moisture sensitivity level MSL-3 requires controlled storage conditions.

Frequently Asked Questions (FAQ)

Q: Can ATL432AIDBZR replace ZXRE252ASA-7 in all applications? A: ATL432AIDBZR is electrically compatible for most applications but has a reduced operating temperature range (-40°C ~ 85°C vs -40°C ~ 125°C). Applications requiring operation above 85°C must use ATL432AQDBZR, AP431SHANTR-G1, or TL431AMFDT,215.

Q: What is the impact of different cathode current values? A: Cathode current affects quiescent power consumption and circuit biasing requirements. Lower cathode current (ATL432AQDBZR at 35 µA) reduces power draw; higher cathode current (TL431AMFDT,215 at 600 µA) increases quiescent current and may require circuit redesign for low-power applications.

Q: Are all substitutes pin-compatible? A: Yes. All substitute parts use SOT-23-3 packaging with identical pinout configuration, enabling direct PCB replacement without layout modifications.

Q: Why do some substitutes have ±0.5% tolerance instead of ±1%? A: ATL432BIDBZR and AP431SHANTR-G1 offer tighter tolerance specifications, providing improved output voltage accuracy. These parts are suitable for precision reference applications where tighter tolerance is required.

Q: What is the significance of MSL rating differences? A: AP431SHANTR-G1 carries MSL-3 (168 Hours), requiring controlled moisture exposure during storage and handling. Other substitutes carry MSL-1 (Unlimited), allowing standard storage conditions. MSL-3 components require desiccant packaging and bake-out procedures before reflow soldering.

Q: Can TL431AMFDT,215 be used as a direct replacement? A: TL431AMFDT,215 is electrically compatible but has significantly higher cathode current (600 µA vs 65 µA). Circuit designs relying on low quiescent current must be evaluated for compatibility with this higher current specification.

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