AS7809ADTR-E1 Equivalent & Substitute Parts

Part Overview

The AS7809ADTR-E1 is a linear voltage regulator IC from Diodes Incorporated, designed to provide a fixed 9V positive output at 1A maximum current in a TO-252-3 surface mount package. This device is classified as obsolete, making equivalent substitute parts necessary for new designs and production continuity. The regulator incorporates over-temperature and short-circuit protection features, with a maximum input voltage of 29V and typical dropout voltage of 2V at full load.

Substiute Parts

AS7809ADTR-E1

Diodes IncorporatedIn Stock: 60493AS7809ADTR-E1 Datasheet

Current PartRFQ

BA17809FP-E2

Rohm SemiconductorIn Stock: 17905BA17809FP-E2 Datasheet

MFR RecommendedRFQ

BA178M09FP-E2

Rohm SemiconductorIn Stock: 30135BA178M09FP-E2 Datasheet

MFR RecommendedRFQ

BA78M09FP-E2

Rohm SemiconductorIn Stock: 4280BA78M09FP-E2 Datasheet

MFR RecommendedRFQ

UA78M09CKVURG3

Texas InstrumentsIn Stock: 1630UA78M09CKVURG3 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the AS7809ADTR-E1 is determined by the following critical parameters:

• Fixed output voltage of 9V
• Surface mount TO-252-3 package compatibility
• Positive output configuration
• Single regulator output
• ROHS3 compliance

The substitute parts are grouped into two categories based on output current capability:

Full Current Substitutes (1A Output): Parts capable of delivering the full 1A output current specified for the original device.

Reduced Current Substitutes (500mA Output): Parts with 500mA maximum output current, suitable for applications where full 1A capacity is not required.

All substitute parts maintain the same 9V fixed output voltage, TO-252-3 package footprint, and surface mount configuration. Input voltage ratings and dropout characteristics vary within acceptable ranges for linear regulator applications.

Parameter Comparison

Engineering Selection Recommendations

BA17809FP-E2 (Rohm Semiconductor): This is the primary full-current substitute, offering 1A output capability matching the original AS7809ADTR-E1 specification. It maintains active product status and ROHS3 compliance. The reduced maximum input voltage (26V vs. 29V) and lower operating temperature upper limit (85°C vs. 125°C) must be evaluated against application requirements. Quiescent current is lower at 4.5 mA.

BA178M09FP-E2 (Rohm Semiconductor): This part provides 500mA output current with active status and ROHS3 compliance. Selection is appropriate for applications where full 1A capacity is not required. Improved PSRR of 67dB and lower quiescent current of 4.5 mA offer performance advantages in noise-sensitive applications.

BA78M09FP-E2 (Rohm Semiconductor): This 500mA substitute maintains quiescent current matching the original part at 6 mA and includes over-current and over-temperature protection. Active product status and ROHS3 compliance are confirmed. Suitable for reduced-current applications with protection feature requirements.

UA78M09CKVURG3 (Texas Instruments): This 500mA substitute offers the highest PSRR at 80dB and includes comprehensive protection features (over-current, over-temperature, short-circuit). Operating temperature range extends to 125°C, matching the original part's upper limit. Moisture sensitivity level is MSL 3, requiring controlled storage conditions. Active product status and ROHS3 compliance are confirmed.

Frequently Asked Questions (FAQ)

Q: Can BA17809FP-E2 be used as a direct replacement for AS7809ADTR-E1?

A: BA17809FP-E2 is functionally compatible as a full-current substitute, providing identical 9V output at 1A in the same TO-252-3 package. However, the maximum input voltage is reduced from 29V to 26V, and the operating temperature range is limited to -40°C to 85°C versus the original -40°C to 125°C. Verify these parameters against your application requirements before substitution.

Q: What is the difference between the 1A and 500mA substitute options?

A: BA17809FP-E2 delivers the full 1A output current specified for the original part. BA178M09FP-E2, BA78M09FP-E2, and UA78M09CKVURG3 are limited to 500mA maximum output. Selection depends on the actual current requirements of your application. If your circuit draws less than 500mA, the reduced-current options are suitable alternatives.

Q: Are all substitute parts pin-compatible with the original AS7809ADTR-E1?

A: All substitute parts use the TO-252-3 package with identical pinout configuration (2 leads plus tab). Physical and electrical pin compatibility is maintained across all listed substitutes.

Q: Which substitute offers the best noise performance?

A: UA78M09CKVURG3 provides the highest PSRR at 80dB (120Hz), compared to 61dB for the original part. This makes it the preferred choice for applications requiring superior power supply rejection ratio performance.

Q: What are the compliance and certification differences?

A: All parts listed are ROHS3 compliant and REACH unaffected. UA78M09CKVURG3 has a moisture sensitivity level of MSL 3 (168 hours), requiring controlled storage conditions, while all other parts have MSL 1 (unlimited). This affects handling and storage requirements during manufacturing.

Q: Can I use a 500mA substitute in a design originally specified for 1A output?

A: Only if your actual circuit current draw does not exceed 500mA. The 500mA substitutes will operate safely at lower currents but cannot supply the full 1A if required. Verify your application's maximum current demand before selecting a reduced-current option.