AN78L08 Linear Voltage Regulator - Equivalent & Substitute Parts

Part Overview

The AN78L08 is a linear voltage regulator IC manufactured by Panasonic Electronic Components, designed to provide a fixed positive 8V output at 100mA. This through-hole component operates across an input voltage range up to 35V and includes integrated over-current and over-temperature protection. The part is classified as obsolete, making identification of suitable substitute components essential for ongoing system support and new design implementations.

Substiute Parts

AN78L08

Panasonic Electronic ComponentsIn Stock: 1087AN78L08 Datasheet

Current PartRFQ

ZSR800GTA

Diodes IncorporatedIn Stock: 4118ZSR800GTA Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the AN78L08 is determined by the following critical parameters:

• Output Voltage: Must be fixed at 8V
• Output Configuration: Must be positive
• Number of Regulators: Single output only
• Protection Features: Over-temperature protection required; over-current or short-circuit protection acceptable
• Operating Temperature Range: Must support at least 0°C to 125°C operation
• Mounting Compatibility: Through-hole or surface-mount packages acceptable based on application requirements

The ZSR800GTA qualifies as a substitute based on matching output voltage (8V), positive output configuration, single regulator topology, and integrated protection features. While the ZSR800GTA offers higher output current capability (200mA vs. 100mA) and improved input voltage tolerance (20V max vs. 35V max), these differences represent functional enhancements rather than incompatibilities.

Parameter Comparison

Engineering Selection Recommendations

Selection between the AN78L08 and ZSR800GTA depends on application-specific constraints:

AN78L08 Selection Criteria:

• Through-hole mounting requirement in existing PCB designs
• Input voltage exceeding 20V (up to 35V maximum)
• Legacy system maintenance where original package form factor is mandated

ZSR800GTA Selection Criteria:

• Surface-mount assembly capability
• Higher output current capacity (200mA) beneficial for load requirements
• ROHS3 compliance and REACH compliance required for new designs
• Extended lower operating temperature range (-55°C) if needed
• Improved PSRR performance (60dB vs. 54dB at 120Hz)

Both parts are classified as obsolete. The ZSR800GTA provides superior regulatory performance and compliance certifications, while the AN78L08 accommodates higher input voltage specifications and through-hole mounting architectures.

Frequently Asked Questions (FAQ)

Q: Can the ZSR800GTA directly replace the AN78L08 in existing through-hole designs?

A: Direct PCB replacement is not possible due to package incompatibility. The AN78L08 uses TO-226-3/TO-92-3 through-hole packages, while the ZSR800GTA uses SOT-223-3 surface-mount packaging. Schematic and layout modifications are required.

Q: What is the impact of the ZSR800GTA's lower maximum input voltage (20V vs. 35V)?

A: Applications operating with input voltages between 20V and 35V cannot use the ZSR800GTA without additional input voltage limiting circuitry. Verify actual input voltage specifications in your application before substitution.

Q: Does the higher output current of the ZSR800GTA (200mA vs. 100mA) create compatibility issues?

A: No. Higher output current capability is a functional enhancement. The ZSR800GTA can supply any load current up to 200mA, making it suitable for applications originally designed for 100mA operation.

Q: Are there compliance differences between these parts?

A: The ZSR800GTA carries ROHS3 and REACH compliance certifications. The AN78L08 compliance status is not specified in available documentation. New designs should prioritize the ZSR800GTA for regulatory compliance.

Q: How do the quiescent current specifications compare?

A: The ZSR800GTA draws significantly lower quiescent current (600 µA vs. 3 mA). This represents improved efficiency for battery-powered or low-power applications, though both values are acceptable for typical linear regulator applications.