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Diodes Incorporated ZXTN649FTA
- Part No.:
- ZXTN649FTA
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
ZXTN649FTA.pdf
- Description:
- TRANS NPN 25V 3A SOT-23-3
- Quantity:
- Payment:
- Shipping:
Inventory:12,729
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Product details
Overview
ZXTN649FTA from Diodes Incorporated is a 25V NPN low-saturation transistor in SOT23 package, designed for high-current switching with VCE(SAT) < 120 mV at 1 A, RCE(SAT) = 77 mΩ, and continuous collector current of 3 A. It serves as a robust power switch in automotive gate drivers and industrial motor control circuits.
For engineers reviewing the ZXTN649FTA datasheet, ZXTN649FTA pinout, ZXTN649FTA application, or ZXTN649FTA equivalent, key selection criteria include saturation voltage under 1A/3A drive, AEC-Q101 qualification, thermal resistance (RθJA = 172 °C/W), and complementary PNP pairing with ZXTP749F.
Technical Context
This NPN bipolar junction transistor operates with forward blocking capability up to 35 V (VCBO) and 25 V (VCEO), supporting stable switching in 12–24 V automotive and industrial rails. Its hFE remains ≥155 at IC = 2 A, enabling reliable base-driven operation without active bias compensation.
The device delivers low on-resistance behavior via optimized epitaxial structure and emitter geometry, achieving RCE(SAT) = 77 mΩ - a design value critical for minimizing conduction loss in high-duty-cycle PWM applications such as MOSFET gate driving and DC motor H-bridge legs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 25 V - Maximum safe collector-emitter voltage before breakdown in common-emitter configuration. |
| IC (continuous) | 3 A - Sustained collector current capability without thermal runaway on standard FR4 PCB. |
| VCE(SAT) | <120 mV @ 1 A / 100 mA - Enables <120 mW conduction loss per switch event at rated load. |
| RCE(SAT) | 77 mΩ - Equivalent on-resistance derived from VCE(SAT)/IC, used for power loss modeling. |
| PD | 725 mW - Max steady-state power dissipation on 15 mm × 15 mm × 1.6 mm FR4 board with 1 oz copper. |
| hFE | ≥155 @ IC = 2 A - Ensures sufficient current gain to maintain saturation with modest base drive. |
| AEC-Q101 | Qualified - Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD (HBM ≥8 kV). |
Pinout & Package
Package: SOT23 - surface-mount plastic case, 0.008 g weight, UL 94V-0 rated, moisture sensitivity level 1, matte tin-plated leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Emitter) | E | Current return path; connected to ground or low-side reference in switch configurations. |
| 2 (Base) | B | Control input; requires ~100 mA drive at 1 A collector load to ensure deep saturation. |
| 3 (Collector) | C | High-side power output node; connects to load or MOSFET gate in driver topologies. |
Key Features
| Feature | Design Value |
|---|---|
| Low VCE(SAT) | ≤120 mV @ 1 A ensures sub-120 mW conduction loss, reducing thermal stress in compact layouts. |
| High IC rating | 3 A continuous current supports direct drive of small solenoids, relays, and logic-level MOSFET gates. |
| AEC-Q101 qualification | Validated for automotive under-hood environments including -55°C to +150°C operation and ESD robustness. |
| Complementary PNP pair | ZXTP749F enables matched push-pull or H-bridge designs with symmetrical saturation performance. |
Applications
| Automotive Gate Driver | Industrial Motor Control |
|---|---|
Use Scenario: Driving the gate of N-channel power MOSFETs in 12 V automotive body control modules. IC Role / Device Role / Timing Role: Low-side NPN switch providing fast turn-on/turn-off with minimal Miller charge injection. Use Value: VCE(SAT) < 120 mV reduces gate drive loss by >40% vs. standard BJT alternatives at 1 A peak current. | Use Scenario: Controlling direction and enable signals in 24 V DC brushed motor H-bridges. IC Role / Device Role / Timing Role: High-current saturated switch interfacing microcontroller GPIO to motor driver IC inputs. Use Value: 3 A IC rating allows direct interface without external buffer stages, simplifying BOM count. |
| Power Supply Sequencing | Industrial Solenoid Interface |
Use Scenario: Enabling auxiliary rail sequencing in multi-output industrial SMPS controllers. IC Role / Device Role / Timing Role: Precision-controlled power switch triggered by supervisor IC outputs. Use Value: Tight hFE specification (≥155 @ 2 A) ensures predictable turn-on timing across temperature. | Use Scenario: Directly energizing 24 V DC solenoids in factory automation valves and actuators. IC Role / Device Role / Timing Role: High-reliability switching element handling repetitive inductive loads. Use Value: AEC-Q101 qualification guarantees long-term stability under mechanical vibration and thermal cycling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar NPN low-saturation transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBT3904-7-F | VCEO = 40 V, IC = 200 mA, VCE(SAT) = 300 mV @ 10 mA - lower current, higher saturation voltage. | Not suitable for >500 mA loads; limited to signal-level switching. | Select only for low-power logic interfacing where thermal margin is abundant. |
| BC817-40,215 | VCEO = 45 V, IC = 500 mA, VCE(SAT) = 250 mV @ 500 mA - lower current, higher RCE(SAT). | Lacks AEC-Q101 qualification and fails to meet 3 A continuous requirement. | Acceptable only in non-automotive consumer applications with derated current. |
Compared with MMBT3904-7-F and BC817-40,215, ZXTN649FTA uniquely combines 3 A current capability, sub-120 mV saturation, and automotive qualification - making it irreplaceable in space-constrained, high-reliability power switching roles.
Availability
ZXTN649FTA is available at Aetrix Electronics and suitable for automotive gate drivers, industrial motor control, power supply sequencing, and solenoid interface applications requiring stable component supply and AEC-Q101 compliance.
Supply support for ZXTN649FTA 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, headquartered in Plano, Texas, with design and manufacturing operations across Asia and the Americas.
The ZXTN649FTA belongs to Diodes' high-reliability power transistor product line, engineered specifically for automotive and industrial switching applications demanding low saturation, high current, and extended temperature operation.
FAQ
What is the maximum allowable base current for ZXTN649FTA?
The absolute maximum base current is 500 mA, but typical operation uses ≤300 mA to achieve full saturation at 3 A collector current. Exceeding 300 mA offers diminishing returns in VCE(SAT) reduction while increasing base drive circuit losses and thermal loading.
Does ZXTN649FTA require a base resistor in all applications?
Yes - a series base resistor is mandatory to limit IB and prevent damage. For 1 A collector load with hFE ≥200, a 10 Ω resistor from a 3.3 V MCU GPIO yields ~230 mA IB, ensuring robust saturation while staying within safe operating limits.
Can ZXTN649FTA replace a MOSFET in low-voltage switching?
No - it cannot match MOSFET gate capacitance immunity or zero-gate-drive requirements. However, it excels where low gate charge injection, precise current mirroring, or cost-sensitive high-current BJT topology is needed - not as a MOSFET substitute, but as a purpose-built saturated switch.
Is the SOT23 footprint compatible with automated pick-and-place equipment?
Yes - the SOT23 package meets JEDEC MO-178 standards with defined pad layout (AP02001) and 0.65 mm pitch. Its 0.008 g mass and matte tin plating ensure reliable solder paste release and reflow wetting in high-volume SMT lines.
ZXTN649FTA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Transistor Type:
- NPN
- Current - Collector (Ic) (Max):
- 3 A
- Voltage - Collector Emitter Breakdown (Max):
- 25 V
- Vce Saturation (Max) @ Ib, Ic:
- 300mV @ 300mA, 3A
- Current - Collector Cutoff (Max):
- 50nA (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 200 @ 100mA, 2V
- Power - Max:
- 725 mW
- Frequency - Transition:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
ZXTN649FTA FAQ
1.How can I place an order for ZXTN649FTA through Aetrix?
Please submit a Request for Quotation (RFQ) for ZXTN649FTA 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 ZXTN649FTA reliable?
The price and inventory of ZXTN649FTA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZXTN649FTA is usually 5 days.
3.What payment methods are accepted for ZXTN649FTA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZXTN649FTA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZXTN649FTA?
ZXTN649FTA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZXTN649FTA 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 ZXTN649FTA?
For technical support, including ZXTN649FTA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZXTN649FTA requirements.
6.How does Aetrix verify that ZXTN649FTA is sourced from the original manufacturer or authorized distributors?
All ZXTN649FTA 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 ZXTN649FTA meets industry standards.
7.What is the process for return or replacement of ZXTN649FTA?
All ZXTN649FTA units undergo pre-shipment inspection (PSI). If there is an issue with ZXTN649FTA, 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 ZXTN649FTA part is unused and in its original packaging.
Return procedure for ZXTN649FTA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ZXTN649FTA Tags
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