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The following are detailed specifications for the ZX5T951GTA chip:
Technical Parameters
- Transistor Type: PNP Bipolar Junction Transistor (BJT)
- Collector-Base Voltage (VCBO): -100 V
- Collector-Emitter Voltage (VCEO): -60 V
- Emitter-Base Voltage (VEBO): -5 V
- Continuous Collector Current (IC): -5.5 A
- Peak Pulse Current (ICM): -10 A
- Power Dissipation (PD):
- 3 W (25°C, standard conditions)
- 1.6 W (TA = 25°C, minimum pad)
- 2 W (TA = 25°C, recommended pad 6.5 cm²)
- Thermal Resistance (RθJA): 78°C/W (minimum pad) / 62.5°C/W (recommended pad)
- Thermal Resistance (RθJC): 15°C/W
- DC Current Gain (hFE): 100 – 300 (IC = -1 A, VCE = -2 V)
- Transition Frequency (fT): 120 MHz (Typical)
- Saturation Voltage (VCE(sat)):
- Typical: -70 mV (IC = -1 A, IB = -10 mA)
- Maximum: -200 mV (IC = -1 A, IB = -10 mA)
- Typical: -500 mV (IC = -5 A, IB = -100 mA)
- Base-Emitter Saturation Voltage (VBE(sat)): -1.2 V (Typical, IC = -5 A, IB = -100 mA)
- Operating Temperature Range: -55°C to +150°C
- Storage Temperature Range: -55°C to +150°C
- Junction Temperature (TJ): +150°C (Maximum)
- Automotive Qualification: AEC-Q101 Compliant (Selected Batches)
Package Dimensions (SOT-223)
Parameter Value
Package Length (D) 6.50 mm (Typ.), 6.70 mm (Max.)
Package Width (E) 3.50 mm (Typ.), 3.70 mm (Max.)
Package Height (A) 1.60 mm (Typ.), 1.80 mm (Max.)
Pin Pitch (e) 2.30 mm (Typ.)
Pin Width (b) 0.70 mm (Typ.), 0.80 mm (Max.)
Heatsink Width (E1) 6.50 mm (Typ.), 7.00 mm (Max.)
Pin Length (L) 1.50 mm (Typ.), 1.75 mm (Max.)
Pin Definition (SOT-223-3 / SOT-223-4)
Pin Name Function
1 Base (B) Base; Control Input
2 Collector (C) Collector; Power Output
3 / 4 Emitter (E) Emitter; Ground / Negative Supply
Heatsink (Tab) Collector (C) Collector; Internally connected to Pin 2; Used for heat dissipation
Typical Application Circuit
1. Linear Regulator (Low-Dropout Regulator)
```
VIN (-12V)
│
├──┬──┐
│ │ │
│ C1 │ 10µF
│ │ │
│ └──┤
│ │
├─────┤
│ │
├─C───┤──→ VOUT (-5V)
│ ZX │
├─B───┤ R1
│5T951│ │
├─E───┤ ├──→ GND
│ │ │
└──┬──┘ R2
│ │
└───────┘
│
GND
```
- Features: Utilizes the ZX5T951GTA ...low saturation voltage drop characteristics, enabling low-dropout linear voltage regulation.
2. High-Side Switch
```
VCC (-12V)
│
├──┬──┐
│ │ │
│ ZX │
│5T951│
│ C │
├──┬──┤
│ │
│ RLOAD
│ │
└──┴──→ GND
│
B ←── Control Signal (MCU)
│
E ←── GND
```
- Features: The PNP structure is suitable for high-side switch applications; it turns on when the base is at a low logic level.
3. Audio Power Amplifier Output Stage
```
VCC (-12V)
│
├──┬──┐
│ │ │
│ ZX │ PNP Output Transistor
│5T951│
│ C │
├──┬──┤
│ │
├──┴──→ Speaker
│
│ NPN Complementary Transistor
│
GND
```
- Features: Forms a push-pull output stage in conjunction with a complementary NPN transistor (e.g., ZX5T952GTA).
Key Characteristic Curves
Parameter Conditions Typical Value
hFE vs IC VCE = -2 V 100 @ -10 mA, 200 @ -1 A, 150 @ -5 A
VCE(sat) vs IC IB = IC/10 -70 mV @ -1 A, -500 mV @ -5 A
fT vs IC VCE = -10 V 120 MHz @ -500 mA
Precautions
- Compatibility: The ZX5T951GTA features PNP polarity; please ensure that the circuit topology is suitable for PNP high-side switching or complementary output applications. For NPN requirements, please select the ZX5T952GTA.
- Installation Instructions:
- The heatsink tab (Tab) of the SOT-223 package is internally connected to the collector. When designing the PCB layout, consideration must be given to either electrical isolation or shared-potential heat dissipation. - A copper pad area of ≥ 6.5 cm² is recommended to reduce thermal resistance to below 62.5°C/W.
- For high-current applications (>3A), the addition of an external heatsink or forced air cooling is recommended.
- Soldering Temperature: Reflow soldering peak temperature ≤ 260°C for ≤ 10 seconds; manual soldering iron tip temperature ≤ 350°C for ≤ 5 seconds.
- Technical Support: For further technical assistance, please refer to Diodes Incorporated Application Note AP02002 (SOT-223 Package Guide) or contact an authorized distributor.
Summary
The ZX5T951GTA is a high-performance, medium-power PNP bipolar transistor manufactured by Diodes Incorporated. Housed in a surface-mount SOT-223 package, it features a breakdown voltage of -60V, a continuous current rating of -5.5A, and an exceptionally low saturation voltage drop (-70mV @ -1A). With its 120MHz transition frequency, AEC-Q101 automotive-grade certification, and compact SOT-223 package, this device offers high utility and reliability in applications such as automotive electronics, industrial control, power management, and audio amplification; it serves as a widely adopted solution for PNP power switching and linear driving within the ZX5T series.
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