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Diodes Incorporated ZDT1048TC
- Part No.:
- ZDT1048TC
- Manufacturer:
- Diodes Incorporated
- Category:
- Bipolar Transistor Arrays
- Package:
- SOT-223-8
- Datasheet:
-
ZDT1048TC.pdf
- Description:
- TRANS 2NPN DUAL 17.5V 5A SM8
- Quantity:
- Payment:
- Shipping:
Inventory:3,570
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Product details
Overview
ZDT1048TC from Diodes Incorporated is a dual NPN medium-power high-gain transistor pair in an SM-8 surface-mount package, rated for 5A continuous collector current per device, VCEO > 17.5V, and VCE(sat) < 75mV at 1A. It delivers low saturation voltage and high hFE (up to 1200) for efficient switching in CCFL inverter and Royer oscillator circuits.
For engineers reviewing the ZDT1048TC datasheet, ZDT1048TC pinout, ZDT1048TC application, or ZDT1048TC equivalent, key selection criteria include dual-die thermal derating (22 mW/°C when both transistors are active), SM-8 footprint compatibility, pulsed switching performance (ton = 120 ns, toff = 250 ns), and AEC-Q101 readiness for automotive-grade designs.
Technical Context
The ZDT1048TC integrates two independent NPN silicon transistors on a single die substrate within a thermally optimized SM-8 package. Each transistor supports 5A IC and exhibits hFE ≥ 280 at 10mA and ≥ 250 at 5A, enabling stable current amplification across wide operating ranges.
Its low VCE(sat) (45–75 mV @ 1A/10mA) and high fT (150 MHz) support fast-switching, high-efficiency resonant topologies. The device operates from –55°C to +150°C with junction-to-ambient thermal resistance of 45.5°C/W when both dies are active.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 17.5 V minimum - ensures safe operation in 12–15V bus CCFL inverters |
| IC(cont) | 5 A per transistor - supports medium-power load switching without external heatsinking |
| VCE(sat) | 75 mV max @ 1A/10mA - reduces conduction loss and self-heating in high-duty-cycle oscillators |
| PD | 2.75 W total (both dies active) - defines maximum dissipation on standard 2-inch² PCB copper |
| hFE | 250–1200 - enables reliable base drive with low IB (e.g., 10–100 mA) across load currents |
| fT | 150 MHz - supports stable gain in RF-coupled Royer circuits up to ~1–2 MHz |
| ton/toff | 120 ns / 250 ns - enables precise timing control in self-oscillating resonant converters |
Pinout & Package
Package: SM-8, 8-pin surface-mount molded plastic (UL 94V-0), 6.6 mm × 7.0 mm body, 0.90 mm nominal height, matte tin-plated leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 | Emitter 1 | Common emitter connection for first NPN transistor; tied internally to pin 1 and 2 for low-inductance layout |
| 3 | Base 1 | Control input for first transistor; requires ~10 mA drive for full 5A saturation |
| 4 | Collector 1 | Main output node for first transistor; rated for 50 V VCBO and 20 A pulse current |
| 5, 6 | Emitter 2 | Common emitter connection for second NPN transistor; isolated from Emitter 1 |
| 7 | Base 2 | Independent control input for second transistor; supports asynchronous or complementary drive |
| 8 | Collector 2 | Second output node; electrically isolated from Collector 1; shares same thermal path in package |
Key Features
| Feature | Design Value |
|---|---|
| Dual NPN topology | Two fully isolated high-gain transistors in one SM-8 footprint - eliminates inter-device layout mismatch and reduces board area by ~40% vs discrete pairs |
| Low VCE(sat) | 45–75 mV @ 1A - cuts conduction loss by >60% compared to standard 2N2222-based designs at same current |
| High hFE consistency | Min 250 @ 5A - ensures predictable base drive requirements across production lots and temperature range |
| Thermal derating | 22 mW/°C when both dies active - enables accurate power budgeting for dual-transistor operation on shared PCB copper |
Applications
| CCFL Inverter Stage | Royer Oscillator Core |
|---|---|
Use Scenario: Driving cold-cathode fluorescent lamp (CCFL) backlight in industrial displays using resonant half-bridge topology. IC Role / Device Role / Timing Role: Dual NPN switch pair providing complementary push-pull drive to center-tapped transformer primary. Use Value: Low VCE(sat) minimizes heating during 50–100 kHz operation; matched hFE ensures symmetrical duty cycle and reduced EMI. | Use Scenario: Self-oscillating resonant converter for LED driver or auxiliary power supply in automotive infotainment systems. IC Role / Device Role / Timing Role: Active switching element in cross-coupled Royer configuration with feedback winding. Use Value: High fT and fast ton/toff sustain stable oscillation above 500 kHz; dual-die isolation prevents latch-up during transient overloads. |
| Automotive Interior Lighting | Industrial DC-AC Converter |
Use Scenario: Dimmable LED string driver in vehicle cabin lighting with PWM-controlled current regulation. IC Role / Device Role / Timing Role: Synchronous switching transistor in high-side configuration with integrated current sensing. Use Value: AEC-Q101 qualification readiness and –55°C to +150°C operation ensure reliability under hood/cabin thermal cycling. | Use Scenario: 24V-to-115V AC conversion for portable test equipment requiring compact, low-noise output. IC Role / Device Role / Timing Role: Primary-side switching pair in push-pull inverter stage with ferrite core transformer. Use Value: 2.75W total dissipation and 45.5°C/W θJA allow operation at full load without forced air cooling on standard FR4 PCB. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual NPN medium-power switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ZXT10480ZTA | Same SM-8 package, but single-die dual-NPN with lower hFE (min 100 @ 5A) and higher VCE(sat) (120 mV @ 1A) | Limited to lower-frequency (<300 kHz) inverters due to slower switching (toff = 450 ns) | Choose when cost sensitivity outweighs efficiency and speed requirements |
| MBT3904DW1T1G | SOT-363 package, 200 mA IC, VCE(sat) = 300 mV @ 50 mA - not a power-grade replacement | Only suitable for signal-level pre-driver stages, not main switching | Use only as gate/base driver companion, never as direct ZDT1048TC functional substitute |
Compared with ZXT10480ZTA and MBT3904DW1T1G, the ZDT1048TC uniquely combines 5A current capability, sub-75mV saturation, and 150MHz fT in SM-8 - making it the sole option among these three for thermally constrained, high-efficiency medium-power resonant switching.
Availability
ZDT1048TC is available at Aetrix Electronics and suitable for CCFL inverters, Royer oscillators, automotive interior lighting, and industrial DC-AC converters requiring stable component supply and long-term manufacturability planning.
Supply support for ZDT1048TC 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, manufacturing, and sales operations across Asia, Europe, and the Americas.
The ZDT1048TC belongs to Diodes' high-performance bipolar transistor product line, engineered specifically for resonant switching applications demanding low-loss, high-speed, and thermally robust dual-transistor integration.
FAQ
Is ZDT1048TC qualified to AEC-Q101?
No - the ZDT1048TC itself is not AEC-Q101 certified. However, Diodes states that "for automotive applications requiring specific change control (i.e., parts qualified to AEC-Q100/101/104/200…) please contact us or your local representative." This indicates qualification is possible via special release or custom qualification program, not standard shipment.
What is the maximum safe operating current when both transistors are used simultaneously?
Each transistor supports 5A continuous collector current, but simultaneous full-load operation must respect the total package power limit: 2.75W at +25°C ambient, derating linearly by 22 mW/°C above that. At +85°C, max combined dissipation drops to ~1.43W - limiting practical per-transistor current to ~3.2A under worst-case thermal conditions.
Can ZDT1048TC replace discrete SOT-23 NPN transistors in existing designs?
Yes, but only with PCB layout revision. The SM-8 footprint (6.6 mm × 7.0 mm) is incompatible with SOT-23 (2.9 mm × 1.3 mm). Electrical substitution is viable where gain, saturation voltage, and switching speed meet requirements - but mechanical redesign and thermal validation are mandatory before drop-in use.
Why does the datasheet state "NOT RECOMMENDED FOR NEW DESIGNS"?
This notice reflects Diodes' strategic roadmap: newer alternatives (e.g., MOSFET-based or integrated controller solutions) are prioritized for new projects. The ZDT1048TC remains fully supported for existing designs, with no announced obsolescence date, and continues to be manufactured in IATF 16949-certified facilities per datasheet footnote.
ZDT1048TC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SOT-223-8
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Transistor Type:
- 2 NPN (Dual)
- Current - Collector (Ic) (Max):
- 5A
- Voltage - Collector Emitter Breakdown (Max):
- 17.5V
- Vce Saturation (Max) @ Ib, Ic:
- 300mV @ 50mA, 5A
- Current - Collector Cutoff (Max):
- 10nA
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 300 @ 500mA, 2V
- Power - Max:
- 2.75W
- Frequency - Transition:
- 150MHz
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SM8
ZDT1048TC FAQ
1.How can I place an order for ZDT1048TC through Aetrix?
Please submit a Request for Quotation (RFQ) for ZDT1048TC 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 ZDT1048TC reliable?
The price and inventory of ZDT1048TC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZDT1048TC is usually 5 days.
3.What payment methods are accepted for ZDT1048TC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZDT1048TC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZDT1048TC?
ZDT1048TC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZDT1048TC 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 ZDT1048TC?
For technical support, including ZDT1048TC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZDT1048TC requirements.
6.How does Aetrix verify that ZDT1048TC is sourced from the original manufacturer or authorized distributors?
All ZDT1048TC 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 ZDT1048TC meets industry standards.
7.What is the process for return or replacement of ZDT1048TC?
All ZDT1048TC units undergo pre-shipment inspection (PSI). If there is an issue with ZDT1048TC, 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 ZDT1048TC part is unused and in its original packaging.
Return procedure for ZDT1048TC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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