AZ78L08RTR-E1 Equivalent & Substitute Parts

Part Overview

The AZ78L08RTR-E1 is a linear voltage regulator IC manufactured by Diodes Incorporated, designed to provide a fixed positive 8V output at 100mA. This Surface Mount device in SOT-89-3 packaging is classified as obsolete, making identification of suitable substitute components essential for ongoing production and maintenance applications.

The obsolete status of this component necessitates sourcing equivalent alternatives that maintain functional and mechanical compatibility with existing designs while ensuring continued availability and supply chain reliability.

Substiute Parts

AZ78L08RTR-E1

Diodes IncorporatedIn Stock: 1664AZ78L08RTR-E1 Datasheet

Current PartRFQ

L78L08ABUTR

STMicroelectronicsIn Stock: 35134L78L08ABUTR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the AZ78L08RTR-E1 is determined by the following critical parameters:

• Fixed output voltage of 8V
• Output current capability of 100mA minimum
• Surface Mount packaging in SOT-89-3 (TO-243AA)
• Operating temperature range of -40°C to 125°C
• Positive output configuration with fixed regulation
• Over Current and Over Temperature protection features

The L78L08ABUTR from STMicroelectronics qualifies as a direct substitute based on matching all critical electrical and mechanical specifications. Both devices are linear positive fixed voltage regulators with identical output voltage and current ratings, package form factor, and thermal operating range.

Parameter Comparison

Engineering Selection Recommendations

The L78L08ABUTR is the recommended substitute for the obsolete AZ78L08RTR-E1. Both components are ROHS3 compliant and maintain identical output voltage and current specifications. The STMicroelectronics device offers superior input voltage tolerance (30V maximum versus 18V), enhanced protection with integrated Short Circuit protection, and active product status ensuring continued availability.

The L78L08ABUTR is pin-compatible and functionally equivalent for all applications designed around the AZ78L08RTR-E1 specifications. The higher maximum input voltage rating provides additional design margin without compromising performance in existing circuits.

Frequently Asked Questions (FAQ)

Q: Can the L78L08ABUTR directly replace the AZ78L08RTR-E1 in existing designs?

A: Yes. Both devices share identical output voltage (8V), output current (100mA), package form factor (SOT-89-3), and operating temperature range (-40°C to 125°C). Pin configuration and functional behavior are equivalent.

Q: What is the significance of the higher maximum input voltage on the L78L08ABUTR?

A: The L78L08ABUTR accepts input voltages up to 30V compared to 18V for the AZ78L08RTR-E1. This provides additional design flexibility and protection margin. Existing circuits designed for the lower rating remain fully compatible.

Q: Are there differences in quiescent current between these devices?

A: The L78L08ABUTR has a quiescent current of 5.5 mA versus 5 mA for the AZ78L08RTR-E1. This 0.5 mA difference is negligible for most applications and does not affect functional compatibility.

Q: Does the L78L08ABUTR provide additional protection features?

A: Yes. The L78L08ABUTR includes Short Circuit protection in addition to Over Current and Over Temperature protection. The AZ78L08RTR-E1 provides Over Current and Over Temperature protection only.

Q: What is the packaging and mounting compatibility?

A: Both devices use identical Surface Mount packaging: TO-243AA case style with SOT-89-3 pin configuration. No PCB layout modifications are required for substitution.

Q: Why is the AZ78L08RTR-E1 classified as obsolete?

A: Obsolete status indicates the manufacturer has discontinued production. The L78L08ABUTR from STMicroelectronics maintains active production status and is the recommended alternative for new designs and ongoing supply requirements.