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APX809-44SAG-7 Equivalent & Substitute Parts
Part Overview
The APX809-44SAG-7 is a single-channel power management supervisor IC manufactured by Diodes Incorporated, designed for reset and power-on reset applications. This device features push-pull totem pole output configuration in a compact SOT-23-3 surface mount package. The part is classified as Not For New Designs, indicating it has reached end-of-life status. Finding equivalent and substitute parts is necessary to maintain design continuity and ensure long-term component availability for production and field service applications.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | APX809-44SAG-7 |
| Manufacturer | Diodes Incorporated |
| Category | Power Management (PMIC) |
| Type | Simple Reset/Power-On Reset |
| Number of Voltages Monitored | 1 |
| Voltage - Threshold | 4.38V |
| Output Configuration | Push-Pull, Totem Pole |
| Reset Logic | Active Low |
| Reset Timeout | 140ms Minimum |
| Operating Temperature Range | -40°C ~ 85°C (TA) |
| Package / Case | TO-236-3, SC-59, SOT-23-3 |
| Mounting Type | Surface Mount |
| RoHS Status | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
| Product Status | Not For New Designs |
Substitute Part Grouping Explanation
Substitution of the APX809-44SAG-7 is determined by strict equivalence across the following critical parameters:
- Voltage Threshold: 4.38V (primary functional requirement)
- Output Configuration: Push-Pull, Totem Pole (circuit interface requirement)
- Reset Logic: Active Low (signal polarity requirement)
- Reset Timeout: 140ms Minimum (timing specification)
- Package / Case: TO-236-3, SC-59, SOT-23-3 (physical and electrical compatibility)
- Mounting Type: Surface Mount (assembly compatibility)
- Number of Voltages Monitored: 1 (functional scope)
Substitute parts are grouped into three categories based on their relationship to the main part:
Direct Manufacturer Substitutes (Diodes Incorporated): Parts with identical electrical specifications and packaging from the original manufacturer, differing only in product status or packaging format.
Parametric Equivalents: Parts from alternative manufacturers meeting all critical electrical parameters and package requirements, with minor variations in operating temperature range or reset timeout that remain within acceptable application margins.
MFR Recommended Alternatives: Active production parts from Analog Devices Inc., Maxim Integrated, and Microchip Technology that meet or exceed the functional requirements of the APX809-44SAG-7, with extended temperature ranges or improved availability.
Parameter Comparison
| Part Number | Manufacturer | Voltage Threshold | Output | Reset Logic | Reset Timeout | Temp Range | Package | Product Status |
|---|---|---|---|---|---|---|---|---|
| APX809-44SAG-7 | Diodes Incorporated | 4.38V | Push-Pull, Totem Pole | Active Low | 140ms Min | -40°C ~ 85°C | SOT-23-3 | Not For New Designs |
| APX809S-44SA-7 | Diodes Incorporated | 4.38V | Push-Pull, Totem Pole | Active Low | 140ms Min | -40°C ~ 125°C | SOT-23-3 | Active |
| APX809-44SRG-7 | Diodes Incorporated | 4.38V | Push-Pull, Totem Pole | Active Low | 140ms Min | -40°C ~ 85°C | SOT23R | Discontinued at DiGi Electronics |
| ADM809MARTZ-REEL | Analog Devices Inc. | 4.38V | Push-Pull, Totem Pole | Active Low | 140ms Min | -40°C ~ 125°C | SOT-23-3 | Active |
| ADM809MARTZ-REEL7 | Analog Devices Inc. | 4.38V | Push-Pull, Totem Pole | Active Low | 140ms Min | -40°C ~ 125°C | SOT-23-3 | Active |
| MAX6346UR44+T | Analog Devices Inc./Maxim Integrated | 4.38V | Push-Pull, Totem Pole | Active Low | 100ms Min | -40°C ~ 85°C | SOT-23-3 | Active |
| MAX6801UR44D3+T | Analog Devices Inc./Maxim Integrated | 4.38V | Push-Pull, Totem Pole | Active Low | 100ms Min | -40°C ~ 125°C | SOT-23-3 | Active |
| MAX809MEUR+T | Analog Devices Inc./Maxim Integrated | 4.38V | Push-Pull, Totem Pole | Active Low | 140ms Min | -40°C ~ 105°C | SOT-23-3 | Active |
| MAX809MEUR+T10 | Analog Devices Inc./Maxim Integrated | 4.38V | Push-Pull, Totem Pole | Active Low | 140ms Min | -40°C ~ 105°C | SOT-23-3 | Active |
| MCP809T-450I/TT | Microchip Technology | 4.375V | Push-Pull, Totem Pole | Active Low | 150ms Min | -40°C ~ 85°C | SOT-23-3 | Active |
| MIC809MUY-TR | Microchip Technology | 4.38V | Push-Pull, Totem Pole | Active Low | 140ms Min | -40°C ~ 85°C | SOT-23-3 | Active |
Engineering Selection Recommendations
Primary Recommendation: APX809S-44SA-7 (Diodes Incorporated) is the direct successor to the APX809-44SAG-7. This part maintains identical electrical specifications while offering extended operating temperature range (-40°C ~ 125°C) and active product status. It is ROHS3 compliant and carries unlimited moisture sensitivity level rating, matching the original part's compliance profile.
Secondary Recommendations for Extended Temperature Applications: ADM809MARTZ-REEL7 and MAX6801UR44D3+T both provide -40°C ~ 125°C operating range with identical voltage threshold and reset timeout specifications. Both are active production parts with full ROHS3 compliance and unlimited MSL rating.
Alternative for Equivalent Performance: MAX809MEUR+T offers identical reset timeout (140ms) and voltage threshold (4.38V) with intermediate temperature range (-40°C ~ 105°C). This part is actively produced and maintains all compliance certifications.
Microchip Alternative: MIC809MUY-TR provides parametric equivalence with identical voltage threshold and reset timeout. The MCP809T-450I/TT variant from Microchip offers marginally different voltage threshold (4.375V) and reset timeout (150ms), which may be acceptable depending on circuit margin requirements.
All recommended substitutes are ROHS3 compliant, carry unlimited MSL rating, and are classified as active production parts, ensuring long-term availability and supply chain stability.
Frequently Asked Questions (FAQ)
Q: Can I directly replace APX809-44SAG-7 with APX809S-44SA-7?
A: Yes. APX809S-44SA-7 is the direct Diodes Incorporated successor with identical electrical specifications (4.38V threshold, 140ms reset timeout, push-pull totem pole output, active low reset). The primary difference is extended operating temperature range (-40°C ~ 125°C versus -40°C ~ 85°C) and active product status. This is a pin-compatible, drop-in replacement.
Q: What is the difference between the Diodes Incorporated APX809 variants?
A: APX809-44SAG-7 (original, not for new designs) and APX809S-44SA-7 (active) differ in product status and temperature range. APX809-44SRG-7 uses SOT23R package variant instead of standard SOT-23-3, and is discontinued at DiGi Electronics. All three share identical electrical parameters (4.38V threshold, 140ms timeout, active low reset).
Q: Are Analog Devices ADM809 parts fully compatible?
A: Yes. ADM809MARTZ-REEL and ADM809MARTZ-REEL7 are fully compatible with identical voltage threshold (4.38V), reset timeout (140ms), output configuration (push-pull totem pole), and reset logic (active low). Both are active production parts with extended temperature range (-40°C ~ 125°C). Package and mounting type are identical (SOT-23-3, surface mount).
Q: What is the difference between MAX6346UR44+T and MAX6801UR44D3+T?
A: Both are Maxim Integrated parts with identical voltage threshold (4.38V) and output configuration. The primary difference is reset timeout: MAX6346UR44+T specifies 100ms minimum, while MAX6801UR44D3+T specifies 100ms minimum. MAX6801UR44D3+T offers extended temperature range (-40°C ~ 125°C) compared to MAX6346UR44+T (-40°C ~ 85°C). Both are active production parts.
Q: Can I use MCP809T-450I/TT as a substitute?
A: MCP809T-450I/TT from Microchip Technology is a parametric equivalent with voltage threshold of 4.375V (versus 4.38V) and reset timeout of 150ms minimum (versus 140ms). These minor variations may be acceptable depending on circuit design margins. The part is actively produced and maintains identical package (SOT-23-3) and output configuration (push-pull totem pole, active low reset).
Q: What does "Not For New Designs" mean for the APX809-44SAG-7?
A: This designation indicates the part has reached end-of-life status and is no longer recommended for new circuit designs. Existing inventory may remain available, but long-term supply cannot be guaranteed. Migration to active production alternatives such as APX809S-44SA-7, ADM809MARTZ-REEL7, or MAX809MEUR+T is recommended for new designs and production continuity.
Q: Are all substitute parts ROHS3 compliant?
A: Yes. All substitute parts listed in this reference maintain ROHS3 compliance and unlimited moisture sensitivity level (MSL 1) rating, matching the original APX809-44SAG-7 specifications. All parts are also REACH unaffected and classified under ECCN EAR99.
Q: Which substitute offers the best temperature range coverage?
A: ADM809MARTZ-REEL7, ADM809MARTZ-REEL, and MAX6801UR44D3+T all provide -40°C ~ 125°C operating range, extending 40°C above the original part's upper limit. These are recommended for applications requiring extended high-temperature operation while maintaining identical electrical specifications.
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