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ST221A ✓ Verified by PartsTable
— · SFP TRANSCEIVER
WHAT YOU NEED TO KNOW
SR = Short Range (multimode, 300m) | LR = Long Range (single-mode, 10km) DOM = Digital Optical Monitoring — most enterprise SFPs support it
MATCH ALL THREE: Speed + Wavelength + Brand compatibility
PRODUCT OVERVIEW

The TRANSISTOR is a the manufacturer industrial component. Key specifications include overall_length: 0.210 INCHES MAXIMUM IN, mounting_method: TERMINAL, terminal_length: 0.500 INCHES MAXIMUM IN, overall_diameter: 0.205 INCHES MAXIMUM IN, special_features: JUNCTION PATTERN ARRANGEMENT: NPN, internal_configuration: JUNCTION CONTACT. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5961-00-902-4664, indicating validated use in U.S.

government and defense logistics supply chains. Available through authorized enterprise resellers and TPM (Third Party Maintenance) channels. Verify compatibility with your specific system configuration before ordering.

WHERE IT FITS
ST221A
NSN: 5961-00-902-4664
FSC: 5961
CAGE: 96238 — DNE TECHNOLOGIES, INC (USA)
SPECIFICATIONS
overall_length0.210 INCHES MAXIMUM IN
mounting_methodTERMINAL
terminal_length0.500 INCHES MAXIMUM IN
overall_diameter0.205 INCHES MAXIMUM IN
special_featuresJUNCTION PATTERN ARRANGEMENT: NPN
internal_configurationJUNCTION CONTACT
semiconductor_materialSILICON
terminal_circle_diameter0.100 INCHES NOMINAL IN
terminal_type_and_quantity3 UNINSULATED WIRE LEAD
power_rating_per_characteristic200.0 MILLIWATTS MAXIMUM COLLECTOR POWER DISSIPATION
voltage_rating_in_volts_per_characteristic25.0 MAXIMUM COLLECTOR TO BASE VOLTAGE, DC AND 25.0 MAXIMUM COLLECTOR TO EMITTER VOLTAGE, DC AND 5.0 MAXIMUM EMITTER TO BASE VOLTAGE, DC
NSN5961-00-902-4664
COMPONENT DIAGRAM
BAIL LATCH 10G SFP+ 850nm · SR (MMF, 300m) DOM: Digital Optical Monitoring TX RX LC DUPLEX 20-PIN EDGE CONNECTOR ~56.5 mm ~13.4mm SFP+ TRANSCEIVER | 10G | 850nm | SR (MMF, 300m) Hot-swappable | LC duplex fiber | DDM/DOM supported TITLE SFP+ XCVR PN ST221A MFR OEM TRANSISTOR
KEY FEATURES
•
TERMINAL CIRCLE DIAMETER: 0.100 INCHES NOMINAL IN
•
TERMINAL LENGTH: 0.500 INCHES MAXIMUM IN
•
VOLTAGE RATING IN VOLTS PER CHARACTERISTIC: 25.0 MAXIMUM COLLECTOR TO BASE VOLTAGE, DC AND 25.0 MAXIMUM COLLECTOR TO EMITTER VOLTAGE, DC AND 5.0 MAXIMUM EMITTER TO BASE VOLTAGE, DC
•
INTERNAL CONFIGURATION: JUNCTION CONTACT
•
POWER RATING PER CHARACTERISTIC: 200.0 MILLIWATTS MAXIMUM COLLECTOR POWER DISSIPATION
•
TERMINAL TYPE AND QUANTITY: 3 UNINSULATED WIRE LEAD
TECHNICAL CHARACTERISTICS (FLIS)
TERMINAL CIRCLE DIAMETER0.100 INCHES NOMINAL IN
TERMINAL LENGTH0.500 INCHES MAXIMUM IN
OVERALL LENGTH0.210 INCHES MAXIMUM IN
VOLTAGE RATING IN VOLTS PER CHARACTERISTIC25.0 MAXIMUM COLLECTOR TO BASE VOLTAGE, DC AND 25.0 MAXIMUM COLLECTOR TO EMITTER VOLTAGE, DC AND 5.0 MAXIMUM EMITTER TO BASE VOLTAGE, DC
INTERNAL CONFIGURATIONJUNCTION CONTACT
POWER RATING PER CHARACTERISTIC200.0 MILLIWATTS MAXIMUM COLLECTOR POWER DISSIPATION
SPECIAL FEATURESJUNCTION PATTERN ARRANGEMENT: NPN
TERMINAL TYPE AND QUANTITY3 UNINSULATED WIRE LEAD
OVERALL DIAMETER0.205 INCHES MAXIMUM IN
SEMICONDUCTOR MATERIALSILICON
VERIFIED SUBSTITUTES & CROSS-REFERENCES 5
1311X1Interchangeable
interchangeable cross-reference
interchangeable
M311CE1TX9Interchangeable
interchangeable cross-reference
interchangeable
311MQ6B4Interchangeable
interchangeable cross-reference
interchangeable
40001221-000Interchangeable
Same NIIN cross-reference
interchangeable
ST221Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99ESD SensitiveNot HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is ST221A?
ST221A is a TRANSISTOR.
What parts can replace ST221A?
There are 5 known substitutes for ST221A: 1311X1, M311CE1TX9, 311MQ6B4 and 2 more. Substitute compatibility should be verified for your specific system.
Is ST221A still available?
ST221A is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026