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Diodes Incorporated FZT951TA
- Part No.:
- FZT951TA
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- TO-261-4, TO-261AA
- Datasheet:
-
FZT951TA.pdf
- Description:
- TRANS PNP 60V 5A SOT-223-3
- Quantity:
- Payment:
- Shipping:
Inventory:5,889
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Product details
Overview
FZT951TA from Diodes Incorporated is a PNP silicon planar high-current bipolar junction transistor in SOT-223 package, rated for −5 A continuous collector current, −60 V VCEO, and 3 W power dissipation at Tamb = 25°C; it delivers low VCE(sat) (−155 mV at −2 A/−200 mA) and high hFE (min 75 at −5 A), widely used in industrial DC-DC converter output stages and high-side load switching.
For engineers reviewing the FZT951TA datasheet, FZT951TA pinout, FZT951TA application, or FZT951TA equivalent, key selection criteria include verified PNP polarity, SOT-223 thermal performance under sustained −4 A loads, VCE(sat) stability across −55°C to +150°C, and complementary pairing with FZT851 for push-pull configurations.
Technical Context
This device operates as a medium-power PNP BJT optimized for linear and switching applications requiring robust safe operating area (SOA) up to single-pulse 100 ms at −5 A/−60 V. Its gain structure maintains hFE ≥ 75 at −5 A (IC/IB = 10), supporting stable base-driven control in high-current analog regulators.
VCE(sat) remains ≤ −210 mV up to −5 A with −500 mA base drive, while fT = 120 MHz enables fast turn-off (toff = 350 ns) in PWM-controlled motor drivers and SMPS synchronous rectifier circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | −60 V: Maximum blocking voltage between collector and emitter with base open; defines usable voltage headroom in high-side switch designs. |
| IC (cont.) | −5 A: Continuous DC collector current rating; supports sustained 3 W dissipation on 4-in² PCB copper, enabling compact heatsinkless layouts. |
| VCE(sat) | −155 mV @ −2 A/−200 mA: Low saturation voltage reduces conduction loss by >40% vs. standard PNP transistors at same current. |
| hFE | 75 min @ −5 A: High current gain ensures reliable switching with modest base drive, lowering gate driver IC loading. |
| fT | 120 MHz: Transition frequency supports clean square-wave response up to ~10 MHz switching, suitable for 500 kHz–1 MHz SMPS. |
| toff | 350 ns: Measured with −2 A load and ±200 mA base drive; enables efficient operation in high-frequency DC-DC converters. |
| Ptot | 3 W @ Tamb = 25°C: Power dissipation limit assuming minimum 4-in² copper area; derates linearly above 25°C ambient. |
Pinout & Package
Package: SOT-223 (TO-261AA), surface-mount, thermally enhanced with exposed collector tab (Pin 3). Standard pin assignment per Diodes Inc. marking diagram: Pin 1 = Emitter, Pin 2 = Base, Pin 3 = Collector (tab).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Emitter | Current exit terminal; internally connected to leadframe; requires low-impedance return path for stable biasing. |
| Pin 2 | Base | Control input; driven with negative current to turn on; requires series resistor to limit IB during saturation. |
| Pin 3 | Collector (Tab) | Main current sink terminal and thermal interface; must be soldered to ≥4 in² copper pour for rated Ptot. |
Key Features
| Feature | Design Value |
|---|---|
| High current capability | Rated −5 A continuous with SOA validated to 100 ms pulses at −5 A/−60 V - enables replacement of TO-220 devices in space-constrained boards. |
| Low VCE(sat) | −155 mV at −2 A ensures <0.3 W conduction loss - critical for efficiency in battery-powered 12 V/24 V industrial controls. |
| Wide temperature range | Specified from −55°C to +150°C junction - supports under-hood automotive modules and industrial motor drives without derating. |
| Complementary pairing | Factory-matched with FZT851 (NPN) - simplifies design of Class-B audio amplifiers and H-bridge drivers with matched gain and Vsat. |
Applications
| Industrial DC-DC Converters | High-Side Load Switches |
|---|---|
Use Scenario: Primary-side high-side switch in non-isolated buck regulators delivering 5–24 V at up to 4 A. IC Role / Device Role / Timing Role: PNP pass transistor controlling output voltage via base-emitter bias; operates in linear or saturated mode depending on regulation scheme. Use Value: Low VCE(sat) minimizes dropout and improves efficiency over discrete MOSFET alternatives at <10 V input, especially with limited gate drive voltage. | Use Scenario: 12 V/24 V power rail enable/disable in PLC I/O modules and sensor interface cards. IC Role / Device Role / Timing Role: High-side current switch controlled by microcontroller GPIO through level-shifting circuitry. Use Value: −5 A rating and robust SOA allow direct control of solenoids, relays, and LED arrays without external protection components. |
| Linear Voltage Regulators | Motor Driver Stages |
Use Scenario: Pass element in adjustable 3-terminal linear regulators powering FPGA core supplies or analog signal chains. IC Role / Device Role / Timing Role: Series-pass transistor dissipating excess voltage as heat; biased by error amplifier feedback loop. Use Value: Stable hFE ≥ 75 at full load ensures predictable loop gain and transient response without gain collapse. | Use Scenario: Upper-leg switch in half-bridge motor drivers for 12 V brushed DC motors in HVAC actuators and robotics. IC Role / Device Role / Timing Role: High-side switching element commutated with N-channel low-side partner; driven by isolated gate driver. Use Value: Fast toff (350 ns) and low stored charge reduce shoot-through risk and improve PWM fidelity at 20–50 kHz. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PNP high-current switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ZXT951MATA | Higher VCEO (−100 V), lower hFE (min 50 @ −5 A), SOT-223 package | Better suited for 48 V bus systems; reduced gain requires higher base drive current | Select when higher breakdown voltage is mandatory and base drive capability allows ≥1 A peak IB. |
| MJD2955G | TO-220 package, −10 A rating, higher Ptot (15 W), slower switching (toff ≈ 1.5 µs) | Requires heatsink; unsuitable for high-frequency or space-constrained designs | Choose only when board-level thermal management permits larger footprint and lower switching speed is acceptable. |
Compared with ZXT951MATA and MJD2955G, FZT951TA offers optimal balance of SOT-223 compactness, −60 V robustness, and fast switching-making it preferred for 12–24 V industrial converters where board area and thermal mass are constrained.
Availability
FZT951TA is available at Aetrix Electronics and suitable for industrial DC-DC converters, high-side load switches, and linear voltage regulators requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for FZT951TA includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Diodes Incorporated is a global semiconductor company specializing in discrete, analog, and mixed-signal solutions for industrial, computing, and consumer markets.
FZT951TA belongs to the FZT series of high-performance PNP/NPN transistors designed specifically for demanding power switching and linear regulation applications in harsh environments.
FAQ
What is the maximum allowable junction temperature for FZT951TA?
The absolute maximum junction temperature is +150°C, with storage temperature also rated from −55°C to +150°C. Operation above +150°C risks permanent degradation of hFE and increased leakage; thermal design must ensure Tj stays within this limit using the specified 4-in² copper area.
Can FZT951TA be used in parallel for higher current handling?
Parallel operation is not recommended due to mismatch in VCE(sat) and hFE across units, which causes current imbalance and thermal runaway. For >5 A, use a single higher-rated device like MJD2955G or implement active current-sharing circuitry.
Is the exposed collector tab electrically isolated from other pins?
No-the collector tab (Pin 3) is electrically connected to the collector terminal and must be treated as a live high-current node. It is not insulated; mounting to grounded copper requires isolation pads or conformal coating if electrical isolation is needed.
Does FZT951TA have built-in ESD protection?
No, FZT951TA does not integrate ESD protection diodes. External TVS or RC snubbers are required in applications exposed to human handling or inductive load switching to prevent damage from electrostatic discharge or voltage transients.
FZT951TA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-261-4, TO-261AA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Transistor Type:
- PNP
- Current - Collector (Ic) (Max):
- 5 A
- Voltage - Collector Emitter Breakdown (Max):
- 60 V
- Vce Saturation (Max) @ Ib, Ic:
- 460mV @ 500mA, 5A
- Current - Collector Cutoff (Max):
- 50nA (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 100 @ 2A, 1V
- Power - Max:
- 3 W
- Frequency - Transition:
- 120MHz
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-223-3
FZT951TA FAQ
1.How can I place an order for FZT951TA through Aetrix?
Please submit a Request for Quotation (RFQ) for FZT951TA on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for FZT951TA reliable?
The price and inventory of FZT951TA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FZT951TA is usually 5 days.
3.What payment methods are accepted for FZT951TA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FZT951TA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FZT951TA?
FZT951TA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FZT951TA order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for FZT951TA?
For technical support, including FZT951TA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FZT951TA requirements.
6.How does Aetrix verify that FZT951TA is sourced from the original manufacturer or authorized distributors?
All FZT951TA products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that FZT951TA meets industry standards.
7.What is the process for return or replacement of FZT951TA?
All FZT951TA units undergo pre-shipment inspection (PSI). If there is an issue with FZT951TA, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The FZT951TA part is unused and in its original packaging.
Return procedure for FZT951TA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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