Product Overview
Motorola MDA970-2 Bridge Rectifier - 4A 100V Full-Wave Single-Phase, Case-98 SIP, Unused NOS
Condition
Unused NOS, sourced from an electronics distributor consolidating inventory. Body markings legible: MDA970-2 and AA 7222 with pin polarity identifiers (+, ~, ~, -). Four leads show slight bends and age tarnish consistent with long-term storage.
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Product Overview
Motorola MDA970-2 single-phase full-wave bridge rectifier in a Case-98 through-hole 4-pin SIP package. Converts AC to pulsating DC in linear power supply circuits. A period-correct Motorola part with the classic stylized logo stamp - the kind of component restorers reach for when an original footprint and authentic markings matter.
Key Features
- Maximum repetitive peak reverse voltage (VRRM): 100V
- Average rectified forward output current (IO): 4.0A at 45°C
- Peak forward surge current (IFSM): 80A
- Maximum instantaneous forward voltage drop (VF): 1.0V per diode at 4.0A
- Operating temperature range: -55°C to +125°C
- Package: Case-98, through-hole 4-pin SIP (single inline package)
- Configuration: Single-phase full-wave bridge
- Stamped terminal polarity identifiers (+, ~, ~, -) on body casing
- Distinct round-contoured molded case with Motorola logo
Applications
- Replacing a failed bridge rectifier in a vintage guitar amplifier power supply - desoldering the original, dropping in the MDA970-2, and restoring the AC-to-DC conversion without altering the chassis layout or footprint
- Restoring a legacy linear lab power supply where the original Motorola part is called out on the service schematic and a generic substitute would require board rework
- Rebuilding the power supply section of a vintage transceiver or tube-hybrid amp where period-correct components matter for both function and collector value
- DIY linear power supply builds - connecting the AC terminals to a transformer secondary, adding a filter cap across the DC output, and powering small DC loads or control circuits
- Retro computing or hobbyist bench supply projects where a known, well-documented 4A 100V bridge in a through-hole SIP package fits the design
Frequently Asked Questions
What are the AC input and DC output terminals on this part?
The body is stamped with four terminal identifiers: + (positive DC output), - (negative DC output), and two ~ marks (AC input terminals). The markings are legible on this unit.
Is this compatible with modern boards designed for the MDA970-2 footprint?
The MDA970-2 uses the Case-98 through-hole 4-pin SIP package with the standard pin arrangement for that series. Leads on this unit have slight bends from storage. Confirm your board's hole spacing against the Case-98 dimensions before ordering.
Does it come with anything else - documentation, hardware?
The component only. No documentation or mounting hardware is included.
How does the MDA970-2 differ from other MDA970 variants?
The MDA970 series spans multiple voltage ratings. The MDA970-2 is rated at 100V VRRM. Other variants in the series differ primarily in their peak reverse voltage rating.
Motorola stopped making semiconductors decades ago, but this one never left the shelf. The date code reads AA 7222, the logo is still sharp, and the polarity stamps are exactly where they need to be. Whoever pulls this for a restoration gets the real thing.
