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KST92MTF Equivalent & Substitute Parts
Part Overview
The KST92MTF is a PNP bipolar junction transistor manufactured by onsemi, rated for 300 V collector-emitter breakdown voltage and 500 mA maximum collector current in a surface mount SOT-23-3 package. This device is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The KST92MTF serves in general-purpose switching and amplification applications requiring moderate voltage and current handling in compact form factors.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Transistor Type | PNP | — |
| Collector Current (Max) | 500 | mA |
| Collector-Emitter Breakdown Voltage (Max) | 300 | V |
| Power Dissipation (Max) | 250 | mW |
| Transition Frequency | 50 | MHz |
| DC Current Gain (hFE Min) | 25 | @ 30mA, 10V |
| Operating Temperature Range | -55 to 150 | °C |
| Package | SOT-23-3 | — |
| Mounting Type | Surface Mount | — |
Substitute Part Grouping Explanation
Substitution of the KST92MTF is determined by matching the following critical electrical and mechanical parameters:
Primary Matching Criteria:
- Transistor polarity: PNP
- Collector current rating: 500 mA
- Collector-emitter breakdown voltage: 300 V minimum
- Package type: SOT-23-3 (TO-236-3, SC-59)
- Mounting: Surface mount
- Operating temperature range: -55°C to 150°C minimum
Substitution Categories:
Direct Substitutes maintain all primary parameters and are functionally interchangeable with identical electrical specifications. These include MMBTA92LT1G, SMMBTA92LT1G, SMMBTA92LT3G, and MMBTA92-7-F from onsemi and Diodes Incorporated. All direct substitutes are active products with enhanced power ratings (300 mW) compared to the obsolete KST92MTF (250 mW).
Similar Substitutes share the core electrical specifications but differ in secondary parameters such as power dissipation, current gain, or transition frequency. MMBTA92LT3G, MSB92T1G, and CMPTA92 TR fall into this category. MSB92T1G operates at reduced collector current (150 mA) and power (150 mW), making it suitable only for lower-power applications.
Upgraded Substitutes provide enhanced performance characteristics while maintaining backward compatibility. CMPTA92E TR PBFREE and NSVMMBT6520LT1G offer higher breakdown voltages (350 V) and improved frequency response, suitable for applications requiring additional design margin.
Parameter Comparison
| Part Number | Manufacturer | Status | Ic (Max) mA | Vce(br) V | Power mW | fT MHz | hFE (Min) | Temp Range °C | Package | Automotive Grade |
|---|---|---|---|---|---|---|---|---|---|---|
| KST92MTF | onsemi | Obsolete | 500 | 300 | 250 | 50 | 25 | -55 to 150 | SOT-23-3 | No |
| MMBTA92LT1G | onsemi | Active | 500 | 300 | 300 | 50 | 25 | -55 to 150 | SOT-23-3 | No |
| SMMBTA92LT1G | onsemi | Active | 500 | 300 | 300 | 50 | 25 | -55 to 150 | SOT-23-3 | Yes (AEC-Q101) |
| SMMBTA92LT3G | onsemi | Active | 500 | 300 | 300 | 50 | 25 | -55 to 150 | SOT-23-3 | Yes (AEC-Q101) |
| MMBTA92LT3G | onsemi | Active | 500 | 300 | 300 | 50 | 25 | -55 to 150 | SOT-23-3 | No |
| MMBTA92-7-F | Diodes Incorporated | Active | 500 | 300 | 300 | 50 | 25 | -55 to 150 | SOT-23-3 | Yes (AEC-Q101) |
| CMPTA92 TR | Central Semiconductor Corp | Active | 500 | 300 | 350 | 50 | 25 | -65 to 150 | SOT-23-3 | No |
| MSB92T1G | onsemi | Active | 150 | 300 | 150 | 50 | 25 | -55 to 150 | SC-59 | No |
| CMPTA92E TR PBFREE | Central Semiconductor Corp | Active | 500 | 350 | 350 | 75 | 105 | -65 to 150 | SOT-23-3 | No |
| NSVMMBT6520LT1G | onsemi | Active | 500 | 350 | 225 | 200 | 20 | -55 to 150 | SOT-23-3 | Yes (AEC-Q101) |
| DP350T05-7 | Diodes Incorporated | Active | 500 | 350 | 300 | 50 | 20 | -55 to 150 | SOT-23-3 | No |
Engineering Selection Recommendations
For Direct Replacement (Identical Electrical Performance):
MMBTA92LT1G, SMMBTA92LT1G, SMMBTA92LT3G, and MMBTA92-7-F are functionally equivalent to the KST92MTF with identical collector current, breakdown voltage, current gain, and frequency specifications. All are active products with improved power dissipation ratings (300 mW versus 250 mW). SMMBTA92LT1G and SMMBTA92LT3G carry automotive-grade qualification (AEC-Q101), suitable for applications requiring automotive reliability standards. MMBTA92-7-F from Diodes Incorporated also carries AEC-Q101 qualification. MMBTA92LT3G and SMMBTA92LT3G are supplied in Tape & Reel packaging, while MMBTA92LT1G and SMMBTA92LT1G are available in Cut Tape & Digi-Reel format.
For Applications Requiring Enhanced Voltage Margin:
CMPTA92E TR PBFREE, NSVMMBT6520LT1G, and DP350T05-7 provide 350 V collector-emitter breakdown voltage, offering 50 V additional margin over the KST92MTF specification. CMPTA92E TR PBFREE additionally provides improved current gain (105 versus 25) and higher transition frequency (75 MHz versus 50 MHz). NSVMMBT6520LT1G combines 350 V rating with 200 MHz transition frequency and automotive qualification (AEC-Q101). DP350T05-7 maintains 50 MHz frequency with 350 V rating.
For Current-Limited Applications:
MSB92T1G operates at 150 mA maximum collector current with 150 mW power dissipation, suitable for low-power signal switching where the full 500 mA capability is not required. This device is supplied in SC-59 package variant.
Compliance Considerations:
All substitute parts are RoHS3 compliant and REACH unaffected, matching the KST92MTF environmental compliance status. Moisture sensitivity level is 1 (Unlimited) across all options. All parts are classified under ECCN EAR99 and HTSUS 8541.21.0095 or 8541.21.0075.
Frequently Asked Questions (FAQ)
Q: Can MMBTA92LT1G directly replace KST92MTF in existing designs?
A: Yes. MMBTA92LT1G maintains identical electrical specifications for collector current (500 mA), breakdown voltage (300 V), current gain (25 @ 30mA, 10V), and transition frequency (50 MHz). Both use SOT-23-3 packaging. The primary difference is product status (active versus obsolete) and enhanced power rating (300 mW versus 250 mW), which provides additional design margin.
Q: What is the difference between SMMBTA92LT1G and MMBTA92LT1G?
A: Both parts are electrically identical with 500 mA, 300 V, and 50 MHz specifications. SMMBTA92LT1G carries automotive-grade qualification (AEC-Q101) and is suitable for automotive applications. MMBTA92LT1G is the standard industrial-grade equivalent. Packaging differs: SMMBTA92LT1G is supplied in Cut Tape & Digi-Reel, while MMBTA92LT1G is also available in Tape & Reel (MMBTA92LT3G variant).
Q: When should I use CMPTA92E TR PBFREE instead of direct equivalents?
A: CMPTA92E TR PBFREE is selected when designs require higher collector-emitter breakdown voltage (350 V versus 300 V), improved current gain (105 versus 25), or higher transition frequency (75 MHz versus 50 MHz). This part provides enhanced performance margin for high-voltage or high-frequency switching applications. Extended operating temperature range (-65°C to 150°C) also supports wider environmental requirements.
Q: Is MSB92T1G a suitable replacement for KST92MTF?
A: MSB92T1G is not a direct replacement. While it maintains 300 V breakdown voltage and 50 MHz frequency, maximum collector current is limited to 150 mA (versus 500 mA) and power dissipation to 150 mW (versus 250 mW). MSB92T1G is suitable only for applications where collector current does not exceed 150 mA. Package variant is SC-59 instead of SOT-23-3.
Q: What are the advantages of NSVMMBT6520LT1G?
A: NSVMMBT6520LT1G provides 350 V breakdown voltage (50 V higher margin), 200 MHz transition frequency (4× higher than KST92MTF), and automotive-grade qualification (AEC-Q101). These enhancements support high-frequency switching and high-voltage applications with automotive reliability requirements. Collector current and package remain compatible (500 mA, SOT-23-3).
Q: Are all substitute parts RoHS compliant?
A: Yes. All listed substitute parts are RoHS3 compliant and REACH unaffected, matching the KST92MTF environmental compliance status. Moisture sensitivity level is 1 (Unlimited) for all parts, indicating no special moisture handling requirements.
Q: What packaging options are available for direct equivalents?
A: Direct equivalents are available in two packaging formats: Cut Tape & Digi-Reel (MMBTA92LT1G, SMMBTA92LT1G, MMBTA92-7-F) and Tape & Reel (MMBTA92LT3G, SMMBTA92LT3G). Selection depends on production volume and assembly process requirements. All use SOT-23-3 (TO-236-3, SC-59) physical package.
Q: Can I use DP350T05-7 as a substitute?
A: DP350T05-7 is compatible for applications where 350 V breakdown voltage is acceptable. It maintains 500 mA collector current, 50 MHz frequency, and SOT-23-3 packaging. However, current gain is reduced (20 versus 25) and collector-emitter saturation voltage is higher (1 V @ 5mA, 50mA versus 500 mV @ 2mA, 20mA). Use DP350T05-7 when higher voltage margin is prioritized over saturation characteristics.
Q: Which substitute offers the best automotive qualification?
A: SMMBTA92LT1G, SMMBTA92LT3G, MMBTA92-7-F, and NSVMMBT6520LT1G all carry AEC-Q101 automotive qualification. NSVMMBT6520LT1G additionally provides enhanced frequency response (200 MHz) and higher breakdown voltage (350 V) for demanding automotive applications.
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