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Diodes Incorporated FZT704TA
- Part No.:
- FZT704TA
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- TO-261-4, TO-261AA
- Datasheet:
-
FZT704TA.pdf
- Description:
- TRANS PNP DARL 100V 1.5A SOT223
- Quantity:
- Payment:
- Shipping:
Inventory:5,265
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Product details
Overview
FZT704TA from Diodes Incorporated is a PNP silicon planar medium-power Darlington transistor in SOT-223 package, rated for −100 V VCEO, −2 A IC peak pulse current, 2 W power dissipation, and hFE ≥ 2000 at IC = −1 A. It serves as a high-gain switching element in industrial relay drivers and DC motor control circuits.
For engineers reviewing the FZT704TA datasheet, FZT704TA pinout, FZT704TA application, or FZT704TA equivalent, key selection criteria include guaranteed hFE up to −2 A, fast switching (ton/toff ≤ 0.6/0.8 µs), VCE(sat) ≤ −2.5 V at −2 A, −10 V VEBO, and SOT-223 thermal performance for medium-power linear/switching use.
Technical Context
This Darlington pair integrates a driver and output transistor on a single die to achieve high DC current gain (hFE = 2000–30000) while maintaining controlled saturation behavior. Its complementary topology with FZT604 enables push-pull configurations in bipolar power stages.
The device operates across −55°C to +150°C junction temperature, supports pulsed IC up to −4 A, and delivers fT = 160 MHz at −100 mA, enabling stable operation in medium-frequency switching applications without external gain compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | −100 V: Maximum safe collector-emitter voltage before breakdown under open-base conditions. |
| IC (cont.) | −1.5 A: Continuous DC collector current limit at Tj ≤ 150°C with adequate heatsinking. |
| hFE | 2000–30000: Confirmed DC current gain range across IC = −10 mA to −2 A, enabling low-base-drive designs. |
| VCE(sat) | −1.3 to −2.5 V: Verified saturation voltage at IC = −1 A / −2 A with specified base drive, defining conduction loss. |
| fT | 160 MHz: Transition frequency at IC = −100 mA, VCE = −10 V, indicating usable bandwidth for medium-speed switching. |
| PTOT | 2 W: Total power dissipation capability in SOT-223 package with standard PCB copper area, limiting thermal rise. |
Pinout & Package
SOT-223 package with exposed emitter pad for thermal enhancement and mechanical stability; standardized 4-pin outline (3 active + 1 thermal tab).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Emitter) | Main emitter terminal | Primary current return path; electrically and thermally connected to large copper pad on PCB. |
| 2 (Base) | Control input | Drives Darlington pair; requires IB = −2 mA to saturate at IC = −2 A per datasheet test condition. |
| 3 (Collector) | High-side current sink | Connected to load supply rail; handles full switched current with −100 V standoff rating. |
| 4 (Emitter Tab) | Thermal & electrical emitter tie | Internally bonded to Pin 1; must be soldered to PCB copper for thermal management and low-inductance return. |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed hFE up to −2 A | Enables direct microcontroller GPIO drive without intermediate buffer stage in low-speed logic-level switching. |
| Fast switching (ton/toff) | 0.6 µs / 0.8 µs ensures <1.4 µs total transition time for PWM frequencies up to ~300 kHz with minimal dead-time overhead. |
| −10 V VEBO | Supports reverse-biased base-emitter operation in H-bridge half-bridge commutation without clamping diodes. |
| SOT-223 thermal pad | Allows 2 W dissipation with ≥1 in² 2-oz copper, eliminating need for discrete heatsink in board-mounted medium-power loads. |
Applications
| Industrial Relay Driver | DC Motor Direction Control |
|---|---|
Use Scenario: Driving 24 V/1 A coil relays in PLC I/O modules with 3.3 V or 5 V MCU outputs. IC Role / Device Role / Timing Role: High-gain PNP switch sinking relay coil current; replaces discrete BJT+driver combinations. Use Value: Eliminates external base resistor network and reduces component count by 2–3 parts per channel. | Use Scenario: Controlling bidirectional 12–24 V brushed DC motors in automated gate systems. IC Role / Device Role / Timing Role: Upper-leg switch in complementary H-bridge with FZT604; handles reverse EMF during direction reversal. Use Value: −100 V VCEO withstands motor flyback spikes without snubber, reducing board space and cost. |
| Linear Voltage Regulator Pass Element | High-Side Load Switch |
Use Scenario: Series pass transistor in adjustable 5–15 V, 1 A linear regulators for analog sensor supplies. IC Role / Device Role / Timing Role: Medium-power series regulator element with low VCE(sat) to minimize dropout voltage. Use Value: VCE(sat) ≤ −2.5 V at −2 A enables <3 V dropout at full load, improving efficiency over standard PNP transistors. | Use Scenario: Power sequencing switch for 12 V subsystems in industrial HMIs with enable-controlled startup. IC Role / Device Role / Timing Role: High-side current source switch with fast turn-off to prevent inrush-induced brownout. Use Value: toff = 0.8 µs limits fault current duration during hot-plug events, enhancing system robustness. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PNP Darlington switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MJD700 | TO-252 package; −100 V VCEO, −2 A IC, hFE = 750–7500 (lower gain at high current) | Larger footprint; higher thermal resistance; suited for higher ambient temp environments with heatsink mounting | Choose when board space allows TO-252 and higher steady-state power (>2.5 W) is required. |
| ZTX951 | SOT-89 package; −100 V VCEO, −1 A IC, hFE = 500–2000 (no guaranteed spec above −500 mA) | Lower current rating; no thermal pad; limited to ≤1.5 W continuous dissipation | Choose only for space-constrained designs with <1 A load and no pulsed-current requirement. |
Compared with MJD700 and ZTX951, FZT704TA uniquely balances SOT-223 compactness, guaranteed high hFE up to −2 A, and 2 W thermal capability-making it optimal for medium-power, high-gain, PCB-integrated switching where gain consistency and thermal density matter.
Availability
FZT704TA is available at Aetrix Electronics and suitable for industrial relay drivers, DC motor control circuits, and linear regulator pass elements requiring stable component supply and long-term manufacturability.
Supply support for FZT704TA 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 manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability power management and signal integrity solutions for industrial and automotive markets.
FZT704TA belongs to the FZT series of medium-power bipolar transistors designed specifically for robust, high-gain switching in industrial control and power conversion applications where thermal density and gain consistency are critical.
FAQ
What is the maximum safe operating temperature for FZT704TA?
The FZT704TA has a specified junction temperature range of −55°C to +150°C. Its absolute maximum storage temperature matches this range. Operation beyond +150°C risks permanent degradation of hFE and increased leakage; derating is required above +125°C ambient with standard SOT-223 PCB layout.
Can FZT704TA replace a standard PNP BJT in existing designs?
Yes, but only if the design accommodates its Darlington characteristics: higher VBE(on) (~−1.7 V), slower turn-off than single BJTs, and higher capacitance. Base drive must supply ≥−2 mA to fully saturate at −2 A; verify timing margins in high-frequency PWM use.
Does FZT704TA require an external base resistor?
No external base resistor is mandatory if driven by a current-limited source (e.g., MCU GPIO with series resistor). However, a 1–10 kΩ base resistor is recommended to limit IB during transient overdrive and improve noise immunity in industrial EMI environments.
Is SPICE model support available for FZT704TA?
Yes-Diodes Incorporated provides verified SPICE parameter data upon request for FZT704TA. The model includes temperature-dependent hFE, saturation behavior, and junction capacitances validated against measured fT, Cibo, and Cobo values from the datasheet.
FZT704TA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-261-4, TO-261AA
- Packaging:
- Digi-Reel®
- Product Status:
- Obsolete
- Transistor Type:
- PNP - Darlington
- Current - Collector (Ic) (Max):
- 1.5 A
- Voltage - Collector Emitter Breakdown (Max):
- 100 V
- Vce Saturation (Max) @ Ib, Ic:
- 2.5V @ 2mA, 2A
- Current - Collector Cutoff (Max):
- 10µA
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 3000 @ 1A, 5V
- Power - Max:
- 2 W
- Frequency - Transition:
- 160MHz
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-223-3
FZT704TA FAQ
1.How can I place an order for FZT704TA through Aetrix?
Please submit a Request for Quotation (RFQ) for FZT704TA 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 FZT704TA reliable?
The price and inventory of FZT704TA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FZT704TA is usually 5 days.
3.What payment methods are accepted for FZT704TA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FZT704TA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FZT704TA?
FZT704TA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FZT704TA 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 FZT704TA?
For technical support, including FZT704TA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FZT704TA requirements.
6.How does Aetrix verify that FZT704TA is sourced from the original manufacturer or authorized distributors?
All FZT704TA 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 FZT704TA meets industry standards.
7.What is the process for return or replacement of FZT704TA?
All FZT704TA units undergo pre-shipment inspection (PSI). If there is an issue with FZT704TA, 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 FZT704TA part is unused and in its original packaging.
Return procedure for FZT704TA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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