Overview
Description
Support is limited to customers who have already adopted these products.
Renesas' transistors have a built-in resistor in the base or between the base and the emitter, enabling the reduction of mounting area and the number of parts.
Features
- High current drives such as IC outputs and actuators available
- On-chip bias resistor
- Low power consumption during drive
Comparison
Applications
Documentation
Featured Documentation
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| Type | Title | Date |
| Datasheet | PDF 514 KB 日本語 | |
| Product Change Notice | PDF 4.86 MB 日本語 | |
| Product Change Notice | PDF 3.74 MB 日本語 | |
| Product Change Notice | PDF 143 KB 日本語 | |
| Product Change Notice | PDF 1.46 MB 日本語 | |
| Brochure | PDF 1.32 MB | |
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Design & Development
Models
ECAD Models
Schematic symbols, PCB footprints, and 3D CAD models from SamacSys can be found by clicking on the CAD Model links in the Product Options table. If a symbol or model isn't available, it can be requested directly from SamacSys.
Support
Support Communities
Get quick technical support online from Renesas Engineering Community technical staff.
Support Communities
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HD1A4A
HELP!Please! Tell me what to replace the HD1A4A transistor with.What replacement can there be for HD1A4A? [locked by: AK_Renesas at 8:10 (GMT 0) on 20 Mar 2025]
Mar 13, 2025