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DTC124TKAT146 Equivalent & Substitute Parts
Part Overview
The DTC124TKAT146 is a pre-biased NPN bipolar junction transistor (BJT) manufactured by Rohm Semiconductor. This surface mount device operates at 50 V collector-emitter breakdown voltage with a maximum collector current of 100 mA and 250 MHz transition frequency. The part is classified as "Not For New Designs," indicating it has been superseded in the manufacturer's product line. Finding equivalent and substitute parts is necessary for ongoing support of legacy systems, inventory management, and design flexibility when the primary part becomes unavailable.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Transistor Type | NPN - Pre-Biased | — |
| Collector Current (Ic) Maximum | 100 | mA |
| Collector-Emitter Breakdown Voltage (Vceo) | 50 | V |
| Base Resistor (R1) | 22 | kOhms |
| DC Current Gain (hFE) @ Ic, Vce | 100 @ 1mA, 5V | — |
| Vce Saturation (Max) @ Ib, Ic | 300mV @ 500µA, 5mA | — |
| Collector Cutoff Current (ICBO) | 500 | nA |
| Transition Frequency | 250 | MHz |
| Power Dissipation Maximum | 200 | mW |
| Package Type | TO-236-3, SC-59, SOT-23-3 | — |
| Mounting Type | Surface Mount | — |
| RoHS Status | ROHS3 Compliant | — |
| Moisture Sensitivity Level | 1 (Unlimited) | — |
Substitute Part Grouping Explanation
Substitution of the DTC124TKAT146 is determined by strict equivalence across the following critical parameters:
Primary Substitution Criteria:
- Transistor type: NPN pre-biased configuration
- Collector current rating: 100 mA maximum
- Collector-emitter breakdown voltage: 50 V
- Base resistor value: 22 kOhms (for direct pin-compatible replacement)
- Package compatibility: SOT-23-3 or TO-236-3 footprint
- Surface mount technology
Secondary Compatibility Factors:
- DC current gain (hFE) minimum specification
- Vce saturation voltage at specified bias conditions
- Transition frequency performance
- Power dissipation capability
- RoHS and REACH compliance status
Parts are grouped into two categories:
Direct Equivalents: Parts with identical base resistor value (22 kOhms), matching DC current gain specifications, and equivalent electrical performance across all rated conditions.
Functional Substitutes: Parts with different internal resistor networks or slightly different gain characteristics that maintain the same voltage and current ratings but may require circuit verification for specific bias point applications.
Parameter Comparison
| Part Number | Manufacturer | Ic (Max) mA | Vceo (Max) V | R1 (Base) kOhms | hFE @ Ic, Vce | Vce Sat (Max) mV | Freq MHz | Power mW | Package | Status |
|---|---|---|---|---|---|---|---|---|---|---|
| DTC124TKAT146 | Rohm Semiconductor | 100 | 50 | 22 | 100 @ 1mA, 5V | 300 @ 500µA, 5mA | 250 | 200 | SOT-23-3 | Not For New Designs |
| DDTC124TCA-7-F | Diodes Incorporated | 100 | 50 | 22 | 100 @ 1mA, 5V | 300 @ 500µA, 5mA | 250 | 200 | SOT-23-3 | Active |
| PDTC124ET,215 | Nexperia USA Inc. | 100 | 50 | 22 | 60 @ 5mA, 5V | 150 @ 500µA, 10mA | — | 250 | SOT-23-3 | Active |
| PDTC124TT,215 | Nexperia USA Inc. | 100 | 50 | 22 | 100 @ 1mA, 5V | 150 @ 500µA, 10mA | — | 250 | SOT-23-3 | Active |
| RN1412TE85LF | Toshiba Semiconductor | 100 | 50 | 22 | 120 @ 1mA, 5V | 300 @ 250µA, 5mA | 250 | 200 | SOT-23-3 | Active |
| DDTC124GCA-7-F | Diodes Incorporated | 100 | 50 | 22 (R2) | 56 @ 5mA, 5V | 300 @ 500µA, 10mA | 250 | 200 | SOT-23-3 | Active |
Engineering Selection Recommendations
Primary Recommendation: DDTC124TCA-7-F (Diodes Incorporated)
This part provides direct electrical equivalence to the DTC124TKAT146 with identical specifications across all critical parameters: 100 mA collector current, 50 V breakdown voltage, 22 kOhms base resistor, 100 hFE minimum at 1 mA/5V, and 250 MHz transition frequency. The part is in active production status with ROHS3 compliance and unlimited moisture sensitivity rating. Inventory availability is substantial (32,529 units), ensuring supply continuity.
Secondary Recommendation: PDTC124TT,215 (Nexperia USA Inc.)
This part maintains electrical equivalence for the primary operating parameters with 100 mA collector current, 50 V breakdown voltage, and 100 hFE specification. It includes AEC-Q100 automotive qualification, which provides additional reliability assurance for critical applications. Power dissipation is rated at 250 mW, exceeding the original 200 mW specification. Tape & Reel packaging matches the original format.
Alternative Recommendation: RN1412TE85LF (Toshiba Semiconductor)
This Toshiba device maintains full electrical compatibility with 100 mA/50 V ratings and 22 kOhms base resistor. The hFE specification of 120 at 1 mA/5V provides slightly higher gain than the original part. Transition frequency matches at 250 MHz. The part is supplied in Cut Tape format with 2,567 units in stock.
Functional Substitute: PDTC124ET,215 (Nexperia USA Inc.)
This part shares the same voltage and current ratings but includes an additional 22 kOhms emitter-base resistor (R2) not present in the original design. The DC current gain is specified at 60 hFE minimum at 5 mA/5V, and Vce saturation is reduced to 150 mV. This configuration is suitable for applications where lower saturation voltage is beneficial, but circuit behavior will differ from the original part due to the additional resistor network.
Not Recommended for Direct Substitution:
DDTC124GCA-7-F, DDTC114TCA-7-F, DDTC115GCA-7-F, and DDTC123TCA-7-F have different internal resistor configurations or gain characteristics that deviate from the DTC124TKAT146 specification. These parts are suitable only for applications where the specific resistor network and gain characteristics are compatible with the circuit design.
Frequently Asked Questions (FAQ)
Q: Can DDTC124TCA-7-F be used as a direct replacement for DTC124TKAT146 without circuit modification?
A: Yes. DDTC124TCA-7-F provides complete electrical equivalence with identical collector current (100 mA), breakdown voltage (50 V), base resistor (22 kOhms), DC current gain (100 hFE @ 1 mA/5V), and saturation voltage (300 mV @ 500µA/5mA) specifications. The SOT-23-3 package footprint is identical. No circuit modification is required.
Q: What is the difference between PDTC124TT,215 and PDTC124ET,215?
A: Both parts share the same voltage and current ratings (100 mA/50 V) and base resistor value (22 kOhms). PDTC124TT,215 specifies 100 hFE minimum at 1 mA/5V and is supplied in Tape & Reel format with AEC-Q100 automotive qualification. PDTC124ET,215 specifies 60 hFE minimum at 5 mA/5V, includes an additional 22 kOhms emitter-base resistor, and is supplied in Cut Tape format. PDTC124TT,215 is the closer electrical match to the original DTC124TKAT146.
Q: Why does RN1412TE85LF have a higher hFE specification (120) than the original part (100)?
A: The RN1412TE85LF is specified with 120 hFE minimum at 1 mA/5V, which is within the acceptable range for pre-biased transistor substitution. Higher gain does not prevent substitution; it indicates the device will reach saturation at slightly lower base current. For most switching applications, this is not problematic. Circuit verification is recommended only if the application depends on specific gain matching or biasing at the edge of saturation.
Q: Are all substitute parts RoHS3 compliant?
A: Yes. All recommended substitute parts (DDTC124TCA-7-F, PDTC124TT,215, PDTC124ET,215, and RN1412TE85LF) are ROHS3 compliant. The original DTC124TKAT146 is also ROHS3 compliant. All parts have Moisture Sensitivity Level 1 (Unlimited).
Q: What is the significance of the "Not For New Designs" status on the DTC124TKAT146?
A: This designation indicates that Rohm Semiconductor has discontinued active promotion and development of this part number. The part may still be available from inventory, but the manufacturer recommends using alternative parts for new circuit designs. Existing designs using this part can continue to source it through authorized distributors, but substitution with an active-status equivalent is advisable for long-term supply security.
Q: Can DDTC124GCA-7-F be used instead of DTC124TKAT146?
A: DDTC124GCA-7-F is not recommended as a direct substitute. While it maintains the same voltage and current ratings (100 mA/50 V), it has a different internal resistor configuration with a 22 kOhms emitter-base resistor (R2) instead of the base resistor (R1) configuration of the original part. The DC current gain is specified at 56 hFE minimum at 5 mA/5V, which is significantly lower than the original 100 hFE at 1 mA/5V. This part is suitable only for applications where this specific resistor network and lower gain are compatible with the circuit design.
Q: What packaging formats are available for substitute parts?
A: Substitute parts are available in the following formats: Tape & Reel (TR), Cut Tape (CT), and Digi-Reel®. All parts use the SOT-23-3 or TO-236-3 surface mount package. DDTC124TCA-7-F and PDTC124TT,215 are available in Tape & Reel format, matching the original DTC124TKAT146 packaging. PDTC124ET,215 and RN1412TE85LF are available in Cut Tape format. Packaging selection should be based on assembly process requirements and inventory management practices.
Q: Is AEC-Q100 qualification required for my application?
A: AEC-Q100 qualification is required only for automotive applications subject to automotive industry reliability standards. PDTC124TT,215 carries AEC-Q100 qualification, making it suitable for automotive designs. For non-automotive applications, AEC-Q100 qualification is not necessary, and other substitute parts are acceptable based on electrical equivalence alone.
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