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FZT591TC Equivalent & Substitute Parts
Part Overview
The FZT591TC is a PNP bipolar junction transistor manufactured by Diodes Incorporated, rated for 60 V collector-emitter breakdown voltage and 1 A maximum collector current. The device is packaged in SOT-223-3 surface mount configuration and is designed for general-purpose switching and amplification applications. The FZT591TC is classified as obsolete product status, making identification of active equivalent and substitute parts essential for ongoing design support and procurement continuity.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Transistor Type | PNP | — |
| Maximum Collector Current (Ic) | 1 | A |
| Collector-Emitter Breakdown Voltage (Max) | 60 | V |
| Vce Saturation @ Ib, Ic | 600 mV @ 100 mA, 1 A | — |
| Maximum Power Dissipation | 2 | W |
| Transition Frequency | 150 | MHz |
| DC Current Gain (hFE Min) @ Ic, Vce | 100 @ 500 mA, 5 V | — |
| Operating Temperature Range | −55 to 150 | °C |
| Mounting Type | Surface Mount | — |
| Package / Case | SOT-223-3 | — |
| RoHS Status | ROHS3 Compliant | — |
Substitute Part Grouping Explanation
Substitute parts for the FZT591TC are grouped based on strict electrical and mechanical parameter compatibility. The primary substitution criteria are:
Critical Parameters for Substitution:
- Transistor polarity: PNP
- Collector-emitter breakdown voltage: 60 V minimum
- Maximum collector current: 1 A minimum
- Surface mount packaging: SOT-223 or equivalent
- Operating temperature range: −55°C to 150°C minimum
Substitution Categories:
Category 1: Parametric Equivalents (Identical Electrical Specifications) Parts that match all critical electrical parameters and operate within the same voltage and current ratings. These parts are direct functional replacements with identical performance characteristics.
Category 2: Manufacturer Recommended Substitutes (Reduced Power Dissipation) Parts that meet or exceed voltage and current requirements but operate at reduced maximum power dissipation (1 W to 1.3 W versus 2 W). These parts are suitable for applications where the full 2 W power rating is not required. Automotive-grade variants with AEC-Q100 qualification are included in this category.
Category 3: Higher Current Capability Substitutes Parts rated for collector currents exceeding 1 A (3 A to 6 A) while maintaining 60 V breakdown voltage. These parts provide additional design margin for higher current applications and are backward compatible with 1 A designs.
Parameter Comparison
| Part Number | Manufacturer | Ic (Max) [A] | Vce(br) [V] | Pmax [W] | fT [MHz] | hFE (Min) | Package | Status |
|---|---|---|---|---|---|---|---|---|
| FZT591TC | Diodes Inc. | 1 | 60 | 2 | 150 | 100 | SOT-223-3 | Obsolete |
| FZT591TA | Diodes Inc. | 1 | 60 | 2 | 150 | 100 | SOT-223-3 | Active |
| BCP52,135 | Nexperia USA Inc. | 1 | 60 | 1 | 145 | 63 | SOT-223 | Active |
| BCP52-10,135 | Nexperia USA Inc. | 1 | 60 | 1.3 | 145 | 63 | SOT-223 | Active |
| BCP52-16,115 | Nexperia USA Inc. | 1 | 60 | 1 | 145 | 100 | SOT-223 | Active |
| BSP31,115 | NXP USA Inc. | 1 | 60 | 1.3 | 100 | 100 | SOT-223 | Active |
| BCP51,115 | Nexperia USA Inc. | 1 | 45 | 1 | 145 | 63 | SOT-223 | Active |
| BCP51-10,135 | Nexperia USA Inc. | 1 | 45 | 1 | 145 | 63 | SOT-223 | Active |
| NZT660A | onsemi | 3 | 60 | 2 | 75 | 250 | SOT-223-4 | Active |
| NZT660 | Fairchild Semiconductor | 3 | 60 | 2 | 75 | 100 | SOT-223-4 | Active |
| NSS60600MZ4T1G | onsemi | 6 | 60 | 0.8 | 100 | 120 | SOT-223 | Active |
Engineering Selection Recommendations
Primary Recommendation: FZT591TA
The FZT591TA is the direct parametric equivalent to the FZT591TC. Manufactured by Diodes Incorporated, this part maintains identical electrical specifications including 1 A collector current, 60 V breakdown voltage, 2 W power dissipation, and 150 MHz transition frequency. The FZT591TA is classified as active product status with 25,094 units in stock, ensuring long-term availability. This part is ROHS3 compliant and carries REACH Unaffected status, providing regulatory compliance for current manufacturing standards.
Secondary Recommendations: BCP52 Series (Nexperia USA Inc.)
The BCP52,135, BCP52-10,135, and BCP52-16,115 variants are manufacturer-recommended substitutes rated for 60 V breakdown voltage and 1 A collector current. These parts are automotive-grade with AEC-Q100 qualification, suitable for applications requiring enhanced reliability. Power dissipation ranges from 1 W to 1.3 W, which is acceptable for designs not requiring the full 2 W rating of the original part. All variants are active product status with substantial inventory availability.
Alternative for Reduced Voltage Applications: BCP51 Series (Nexperia USA Inc.)
The BCP51,115 and BCP51-10,135 are suitable for applications where collector-emitter breakdown voltage of 45 V is sufficient. These parts maintain 1 A collector current and are automotive-grade with AEC-Q100 qualification. Selection of this series is appropriate only when circuit design confirms that 45 V breakdown voltage meets application requirements.
Higher Current Applications: NZT660A (onsemi)
The NZT660A is rated for 3 A collector current at 60 V breakdown voltage with 2 W power dissipation, matching the original part's power rating. This part is suitable for applications requiring higher current capability while maintaining the same voltage rating. The NZT660A is active product status with 20,127 units in stock and is ROHS3 compliant.
Highest Current Capability: NSS60600MZ4T1G (onsemi)
The NSS60600MZ4T1G is rated for 6 A collector current at 60 V breakdown voltage. This part is suitable for designs requiring maximum current headroom. Power dissipation is rated at 800 mW, which is lower than the original part; applications must confirm this rating is acceptable for their thermal design.
Frequently Asked Questions (FAQ)
Q: Can FZT591TA be used as a direct replacement for FZT591TC?
A: Yes. The FZT591TA is a parametric equivalent with identical electrical specifications: 1 A collector current, 60 V breakdown voltage, 2 W power dissipation, 150 MHz transition frequency, and 100 minimum DC current gain. Both parts use SOT-223-3 packaging. The primary difference is product status: FZT591TC is obsolete while FZT591TA is active.
Q: What is the difference between BCP52,135 and BCP52-10,135?
A: Both parts are rated for 1 A collector current and 60 V breakdown voltage. The primary difference is maximum power dissipation: BCP52,135 is rated for 1 W while BCP52-10,135 is rated for 1.3 W. Both are automotive-grade with AEC-Q100 qualification. Selection depends on application power requirements.
Q: Can BCP51 series parts replace FZT591TC?
A: BCP51 series parts are suitable only for applications where 45 V collector-emitter breakdown voltage is sufficient. The FZT591TC is rated for 60 V. If the circuit design operates at voltages exceeding 45 V, BCP51 series parts are not appropriate substitutes. Verify circuit maximum voltage requirements before selection.
Q: Why is the transition frequency lower in substitute parts?
A: Several substitute parts (BCP52 series at 145 MHz, NZT660A at 75 MHz, NSS60600MZ4T1G at 100 MHz) have lower transition frequencies than the FZT591TC (150 MHz). Lower transition frequency indicates reduced high-frequency performance. For applications operating at frequencies below the substitute part's transition frequency rating, this difference is not significant. For high-frequency switching applications, verify that the substitute part's transition frequency meets circuit requirements.
Q: What is the significance of automotive-grade qualification?
A: Automotive-grade parts with AEC-Q100 qualification (BCP51 and BCP52 series) meet enhanced reliability and testing standards required for automotive applications. These parts are suitable for both automotive and general industrial applications. Non-automotive-grade parts may be used in general industrial applications but are not qualified for automotive use.
Q: Can NSS60600MZ4T1G be used in a 1 A design?
A: Yes. The NSS60600MZ4T1G is rated for 6 A maximum collector current, which exceeds the 1 A requirement. This part is backward compatible with 1 A designs and provides additional current margin. However, the 800 mW power dissipation rating is lower than the original 2 W rating. Verify that the application's power dissipation requirements do not exceed 800 mW.
Q: Are all substitute parts ROHS3 compliant?
A: All substitute parts listed are ROHS3 compliant. The FZT591TC is also ROHS3 compliant. ROHS3 compliance indicates conformance to current environmental and hazardous substance restrictions applicable to electronic components.
Q: What packaging differences exist between substitute parts?
A: All substitute parts use SOT-223 or SOT-223-4 surface mount packaging, which is mechanically compatible with the FZT591TC SOT-223-3 package. Packaging variants differ in lead configuration and internal construction but maintain the same external footprint and pin spacing for PCB mounting compatibility.
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