APX803-31SAG-7 Equivalent & Substitute Parts

Part Overview

The APX803-31SAG-7 is a single-channel power management supervisor IC manufactured by Diodes Incorporated, designed for reset and power-on reset applications. This device features an open drain or open collector output with active low reset functionality and a 140ms minimum reset timeout. The part is classified as "Not For New Designs," indicating it has reached end-of-life status. Identifying functionally equivalent alternatives is necessary for ongoing production support, design revisions, and long-term supply chain continuity.

Key Parameters

Parameter	Value
Voltage Threshold	3.08V
Output Type	Open Drain or Open Collector
Reset Logic	Active Low
Reset Timeout	140ms Minimum
Operating Temperature Range	-40°C to 85°C (TA)
Mounting Type	Surface Mount
Package	SOT-23-3 (TO-236-3, SC-59)
Channels Monitored	1
RoHS Status	ROHS3 Compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the APX803-31SAG-7 is determined by strict equivalence across the following parameters:

Voltage threshold: 3.08V
Output configuration: Open Drain or Open Collector
Reset polarity: Active Low
Reset timeout: 140ms Minimum
Operating temperature range: -40°C to 85°C
Package type: SOT-23-3
Functional classification: Single-channel supervisor

All identified substitute parts maintain identical electrical specifications and mechanical compatibility. Packaging format variations (Tape & Reel, Cut Tape, Digi-Reel) do not affect functional equivalence and represent supply chain options only.

Parameter Comparison

Part Number	Manufacturer	Voltage Threshold	Output Type	Reset Logic	Reset Timeout	Operating Temp	Package	Product Status	Packaging Format
APX803-31SAG-7	Diodes Incorporated	3.08V	Open Drain/Collector	Active Low	140ms Min	-40°C to 85°C	SOT-23-3	Not For New Designs	Tape & Reel
APX803S-31SA-7	Diodes Incorporated	3.08V	Open Drain/Collector	Active Low	140ms Min	-40°C to 85°C	SOT-23-3	Active	Cut Tape & Digi-Reel
APX803-31SRG-7	Diodes Incorporated	3.08V	Open Drain/Collector	Active Low	140ms Min	-40°C to 85°C	SOT-23-3	Active	Tape & Reel
APX803S-31SR-7	Diodes Incorporated	3.08V	Open Drain/Collector	Active Low	140ms Min	-40°C to 85°C	SOT-23-3	Active	Tape & Reel
CAT853TTBI-GT3	onsemi	3.08V	Open Drain/Collector	Active Low	140ms Min	-40°C to 85°C	SOT-23-3	Obsolete	Cut Tape
STM1001TWX6F	STMicroelectronics	3.08V	Open Drain/Collector	Active Low	140ms Min	-40°C to 85°C	SOT-23-3	Active	Cut Tape & Digi-Reel
UM803TS	Union Semiconductor International Limited	3.08V	Open Drain/Collector	Active Low	140ms Min	-40°C to 85°C	SOT-23-3	Active	Tape & Reel

Engineering Selection Recommendations

For applications currently using APX803-31SAG-7, the following selection criteria apply:

Preferred substitutes (Active product status):

APX803S-31SA-7 (Diodes Incorporated) — Direct manufacturer alternative with highest inventory availability (21,115 units)
APX803-31SRG-7 (Diodes Incorporated) — Maintains original manufacturer continuity
APX803S-31SR-7 (Diodes Incorporated) — Active status with established supply chain
STM1001TWX6F (STMicroelectronics) — Highest inventory level (38,200 units) with active product status
UM803TS (Union Semiconductor International Limited) — Largest available inventory (78,621 units) with active status

Secondary option (Obsolete status):

CAT853TTBI-GT3 (onsemi) — Functionally equivalent but obsolete; suitable only for legacy support with limited future availability

All substitute parts maintain ROHS3 compliance, MSL Level 1 rating, and identical electrical and thermal specifications. Selection should prioritize active product status and supply chain availability for new production runs.

Frequently Asked Questions (FAQ)

Q: Can APX803-31SAG-7 be directly replaced with any of these substitutes? A: Yes. All listed parts are functionally equivalent across voltage threshold, output type, reset logic, reset timeout, operating temperature, and package specifications. Direct pin-for-pin substitution is supported without circuit modification.

Q: What is the difference between the Diodes Incorporated variants (APX803-31SAG-7, APX803S-31SA-7, APX803-31SRG-7, APX803S-31SR-7)? A: These variants differ only in packaging format (Tape & Reel versus Cut Tape & Digi-Reel) and product status. Electrical and mechanical specifications are identical. Selection depends on supply chain requirements and packaging preferences.

Q: Why is CAT853TTBI-GT3 listed if it is obsolete? A: CAT853TTBI-GT3 is included for reference and legacy system support. It maintains full functional equivalence but has limited future availability. New designs should prioritize active alternatives.

Q: Are there any thermal or reliability differences between manufacturers? A: All parts share identical operating temperature range (-40°C to 85°C), MSL rating (Level 1), and compliance certifications (ROHS3, REACH Unaffected). Thermal and reliability performance are equivalent across manufacturers.

Q: Does packaging format affect electrical performance? A: No. Tape & Reel, Cut Tape, and Digi-Reel formats are supply chain and handling options only. Electrical specifications and device performance remain unchanged.

Q: Which substitute offers the best supply chain continuity? A: UM803TS (Union Semiconductor) offers the highest inventory level (78,621 units) with active product status. STM1001TWX6F (STMicroelectronics) provides 38,200 units. For manufacturer continuity, APX803S-31SA-7 (Diodes Incorporated) maintains the original manufacturer with 21,115 units available.

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