- 2N2421B
- American Microsemiconductor, Inc.
- UJT, TO-18
- 2N2421
- Central Semiconductor
- MU4893
- 2N2421A
- Central Semiconductor
- MU4893
- 2N2421B
- Central Semiconductor
- MU4893
- 2N2421
- General Electric
- Semiconductor Data Book 1971
- 2N2421A
- General Electric
- Semiconductor Data Book 1971
- 2N2421B
- General Electric
- Semiconductor Data Book 1971
- TC52N2421ECT
- Microchip Technology, Inc.
- 2-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO5
- TC52N2421ECTTR
- Microchip Technology, Inc.
- 2-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO5
- 2N2421
- Semiconductors, Inc.
- Unijunction Transistors
- 2N2421A
- Semiconductors, Inc.
- Unijunction Transistors
- 2N2421B
- Semiconductors, Inc.
- Unijunction Transistors