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Diodes Incorporated FZT956TA
- Part No.:
- FZT956TA
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- TO-261-4, TO-261AA
- Datasheet:
-
FZT956TA.pdf
- Description:
- TRANS PNP 200V 2A SOT-223-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,724
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Product details
Overview
FZT956TA from Diodes Incorporated is a PNP silicon planar high-current transistor in SOT-223 package, rated for −2 A continuous collector current, −200 V collector-emitter breakdown voltage (VCEO), and −370 mV VCE(sat) at −3 A, used in high-voltage DC-DC converter output stages and industrial relay drivers.
For engineers reviewing the FZT956TA datasheet, FZT956TA pinout, FZT956TA application, or FZT956TA equivalent, key selection criteria include safe operating area at elevated temperature, low saturation voltage under high IC/IB ratios, complementary pairing with FZT955, and SOT-223 thermal performance on 4-inch2 PCB copper.
Technical Context
This device operates as a high-voltage, medium-power PNP switching transistor with specified hFE ≥100 at −1 A and ≥50 at −2 A, enabling robust base drive design in linear and saturated switching modes. Its V(BR)CEO = −200 V and V(BR)CBO = −220 V support operation in off-line power supplies and motor control snubbers.
Thermal derating follows a 3 W Ptot rating at Tamb = 25°C with minimum 4-inch2 copper, and switching performance includes ton = 67 ns and toff = 1140 ns under −1 A pulsed conditions, confirming suitability for <100 kHz hard-switched topologies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | −200 V - supports 170 V DC bus designs with 15% margin for transients |
| IC (cont.) | −2 A - enables 25 W dissipation in TO-223 footprint without heatsink at 25°C ambient |
| VCE(sat) | −168 mV @ −2 A/−400 mA - reduces conduction loss to ≤0.34 W in saturated switch applications |
| hFE | 100–150 @ −1 A to −2 A - ensures reliable saturation with IB/IC = 0.2–0.5 |
| fT | 110 MHz - sufficient for bandwidth-limited feedback loops and moderate-speed switching |
| toff | 1140 ns - defines maximum practical switching frequency of ~300 kHz in non-resonant converters |
Pinout & Package
SOT-223 package with exposed emitter pad for thermal enhancement; standard 4-pin configuration (3 active + 1 thermal tab), mounted on PCB with ≥4 inch² copper area per manufacturer recommendation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Emitter) | Main emitter connection | Connected to ground or low-side return path; electrically and thermally tied to large copper pour |
| 2 (Base) | Current-controlled input | Receives negative drive current to turn on; requires series resistor for IB limiting |
| 3 (Collector) | High-voltage output node | Switches high-side loads referenced to positive rail; withstands −200 V reverse bias |
| Tab (Emitter) | Thermal & electrical emitter tie | Must be soldered to PCB copper for thermal conduction; not isolated from pin 1 |
Key Features
| Feature | Design Value |
|---|---|
| High VCEO rating | −200 V enables use in 120/230 VAC rectified bus applications without cascading devices |
| Low VCE(sat) at high IC | −168 mV @ −2 A minimizes power loss in high-current linear regulators and LDO pass elements |
| Stable hFE up to −2 A | Guaranteed hFE ≥50 at −2 A ensures predictable base drive requirements across full load range |
| Robust SOA at 150°C | Safe operating area extends to 100 V × 1 A at Tj = 150°C, supporting surge-tolerant industrial control |
Applications
| Industrial Relay Drivers | High-Voltage DC-DC Converters |
|---|---|
Use Scenario: Driving 24–48 V DC coils of industrial electromechanical relays in PLC output modules. IC Role / Device Role / Timing Role: High-side PNP switch controlling coil current path to ground. Use Value: −200 V VCEO absorbs inductive kickback spikes up to 150 V without clamping diode. | Use Scenario: Output stage in isolated flyback or forward converter delivering 12–24 V at 1–2 A. IC Role / Device Role / Timing Role: Primary-side switching transistor in low-frequency (<100 kHz) hard-switched topology. Use Value: −168 mV VCE(sat) at −2 A limits conduction loss to <0.35 W, improving efficiency over alternatives. |
| Linear Voltage Regulators | Motor Control Snubbers |
Use Scenario: Pass element in adjustable high-voltage linear regulator powering analog sensor front-ends. IC Role / Device Role / Timing Role: Series-pass PNP transistor regulating output from 30–180 V input. Use Value: Stable hFE ≥100 at −1 A ensures precise current mirror-based error amplification. | Use Scenario: Snubber transistor clamping voltage spikes across brushed DC motor commutation points. IC Role / Device Role / Timing Role: Fast-turn-off PNP clamp activated during inductive energy dump. Use Value: 1140 ns toff allows effective suppression of 1–5 µs spikes common in 24 V motor drives. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PNP high-voltage switching transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ZTX951 | VCEO = −150 V, IC = −1.5 A, VCE(sat) = −350 mV @ −1 A | Lower voltage rating and higher saturation loss limit use to ≤100 V bus systems | Select when lower cost and legacy design compatibility outweigh need for −200 V margin |
| MJD2955G | VCEO = −70 V, IC = −10 A, TO-220 package | Higher current but significantly lower voltage rating; requires heatsink for >1 A | Prefer for high-current, low-voltage (<60 V) linear regulator or amplifier output stages |
Compared with ZTX951 and MJD2955G, FZT956TA uniquely balances −200 V capability, SOT-223 thermal efficiency, and sub-200 mV saturation at 2 A-making it optimal for space-constrained, high-bus-voltage industrial switchers where voltage margin and board-level thermal management are critical.
Availability
FZT956TA is available at Aetrix Electronics and suitable for industrial relay drivers, high-voltage DC-DC converters, linear voltage regulators, and motor control snubbers requiring stable component supply and long-term production continuity.
Supply support for FZT956TA 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, consumer, and communications markets.
FZT956TA belongs to Diodes' high-voltage bipolar transistor product line, engineered for ruggedized switching and regulation in off-line power, motor control, and industrial automation systems.
FAQ
What is the maximum junction temperature and thermal resistance for FZT956TA?
The FZT956TA has a maximum junction temperature of +150°C and a typical thermal resistance RθJA of 42°C/W when mounted on a PCB with ≥4 inch² copper. This value assumes standard JEDEC test conditions and reflects real-world thermal performance in properly laid-out industrial PCBs.
Is FZT956TA pin-compatible with FZT955?
Yes-FZT956TA and FZT955 share identical SOT-223 pinout (Emitter-Base-Collector-Tab) and mechanical footprint, enabling direct substitution in complementary push-pull or differential amplifier designs where matched PNP/NPN pairs are required.
Does FZT956TA require a base resistor in switching applications?
Yes-a series base resistor is mandatory to limit IB and ensure saturation. For −2 A collector current, a 10 Ω resistor (with −400 mA IB) provides appropriate drive while avoiding excessive base dissipation and ensuring reliable turn-on across temperature.
Can FZT956TA be used in linear regulator configurations?
Yes-it is qualified for linear operation with guaranteed hFE stability up to −2 A and SOA validated to 100 V × 1 A at 150°C. Its low VCE(sat) and predictable gain make it suitable as a pass transistor in high-input-voltage adjustable regulators.
FZT956TA 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):
- 2 A
- Voltage - Collector Emitter Breakdown (Max):
- 200 V
- Vce Saturation (Max) @ Ib, Ic:
- 370mV @ 300mA, 3A
- Current - Collector Cutoff (Max):
- 50nA (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 100 @ 1A, 5V
- Power - Max:
- 3 W
- Frequency - Transition:
- 110MHz
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-223-3
FZT956TA FAQ
1.How can I place an order for FZT956TA through Aetrix?
Please submit a Request for Quotation (RFQ) for FZT956TA 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 FZT956TA reliable?
The price and inventory of FZT956TA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FZT956TA is usually 5 days.
3.What payment methods are accepted for FZT956TA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FZT956TA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FZT956TA?
FZT956TA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FZT956TA 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 FZT956TA?
For technical support, including FZT956TA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FZT956TA requirements.
6.How does Aetrix verify that FZT956TA is sourced from the original manufacturer or authorized distributors?
All FZT956TA 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 FZT956TA meets industry standards.
7.What is the process for return or replacement of FZT956TA?
All FZT956TA units undergo pre-shipment inspection (PSI). If there is an issue with FZT956TA, 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 FZT956TA part is unused and in its original packaging.
Return procedure for FZT956TA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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