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Diodes Incorporated ZDT694TA
- Part No.:
- ZDT694TA
- Manufacturer:
- Diodes Incorporated
- Category:
- Bipolar Transistor Arrays
- Package:
- SOT-223-8
- Datasheet:
-
ZDT694TA.pdf
- Description:
- TRANS 2NPN DUAL 120V 500MA SM8
- Quantity:
- Payment:
- Shipping:
Inventory:2,569
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Product details
Overview
ZDT694TA from Diodes Incorporated is a dual NPN medium-power high-gain transistor in SM-8 (SOT-223-8) package, rated for 120V VCEO, 0.5A continuous collector current, and minimum hFE of 400 at 200mA. It serves as a robust switching or linear amplification element in automotive power supplies, industrial motor drivers, and LED constant-current regulators.
For engineers reviewing the ZDT694TA datasheet, ZDT694TA pinout, ZDT694TA application, or ZDT694TA equivalent, key selection criteria include its AEC-Q101 qualification, dual-die thermal derating behavior, 2.25W single-die power dissipation, and 130MHz fT for medium-speed switching.
Technical Context
This dual NPN transistor integrates two electrically isolated silicon die in a single SM-8 thermally enhanced leadframe package. Each die supports independent operation with identical absolute maximum ratings: 120V VCEO, 0.5A IC, and 2.25W PD (single-die), derating to 2.75W when both die share load equally under defined PCB conditions.
Its high DC current gain (hFE ≥ 400 @ 200mA, ≥ 150 @ 400mA) enables low-base-drive designs, while VCE(sat) ≤ 0.25V @ 100mA/0.5mA and ≤ 0.50V @ 400mA/5mA ensures efficient conduction. The device meets AEC-Q101 stress testing and features RoHS-compliant, halogen-free "Green" construction.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 120 V - Supports high-side switching in 48V+ industrial and automotive systems without breakdown risk. |
| IC (continuous) | 0.5 A - Enables driving solenoids, relays, or small motors directly without external buffer stages. |
| hFE | ≥400 @ 200mA - Reduces required base drive current by >2× versus standard transistors, easing MCU GPIO loading. |
| VCE(sat) | ≤0.25 V @ 100mA/0.5mA - Limits conduction loss to <25mW at 100mA, critical for thermally constrained PCBs. |
| fT | 130 MHz - Supports PWM switching up to ~1–2 MHz with acceptable gain margin in feedback-controlled regulators. |
| RθJA | 55.6 °C/W - Requires ≥25 mm × 25 mm 2 oz copper pad for full 2.25W dissipation at TA = 25°C. |
| ESD HBM | 4000 V - Provides robust handling tolerance during automated assembly and field service. |
Pinout & Package
Package: SM-8 (8-lead SOT-223 variant), molded plastic with UL 94V-0 rating, matte tin-plated leads, 0.117 g weight. Thermally optimized for PCB-mounted heat dissipation via exposed collector leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4 | Collector (Die 1) | Common high-current output node for first transistor; internally bonded to shared thermal pad. |
| 5, 6, 7, 8 | Collector (Die 2) | Independent high-current output node for second transistor; separate thermal path from Die 1. |
| Lead 1 (top-left) | Emitter (Die 1) | Low-impedance emitter connection; used for current sensing or grounded-emitter configuration. |
| Lead 5 (top-right) | Emitter (Die 2) | Isolated emitter terminal enabling dual-channel independent biasing or differential operation. |
| Lead 2 / Lead 6 | Base (Die 1 / Die 2) | Separated control inputs allow asynchronous switching or mirrored gain staging without crosstalk. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive powertrain and body electronics per stress test requirements (HTOL, TC, HAST, etc.). |
| Dual isolated NPN die | Enables redundant switching paths or parallel current sharing without thermal coupling between channels. |
| High hFE ≥ 400 | Permits direct drive from 3.3V/5V microcontrollers without base resistors exceeding 10 kΩ. |
| RoHS + Halogen-free | Complies with EU Directive 2011/65/EU and contains <900 ppm Br/Cl, <1000 ppm Sb for eco-friendly manufacturing. |
| SM-8 thermal design | Exposed collector leads provide RθJL = 30.7 °C/W to PCB copper, improving thermal reliability over standard SOT-23. |
Applications
| Automotive LED Headlamp Driver | Industrial Relay Interface Module |
|---|---|
Use Scenario: Constant-current switching for high-brightness LED arrays in adaptive front lighting systems (AFS). IC Role / Device Role / Timing Role: Dual NPN switch controlling LED string current and fault isolation path. Use Value: 120V rating withstands load-dump transients; dual die allows independent channel control for left/right beam modulation. | Use Scenario: Solid-state replacement for electromechanical relays in PLC I/O modules. IC Role / Device Role / Timing Role: High-voltage, medium-current switch interfacing 24V/48V control logic to inductive loads. Use Value: 0.5A IC and low VCE(sat) enable >95% efficiency at 200mA; AEC-Q101 grade ensures long-term reliability in factory environments. |
| DC-DC Converter Pre-regulator | Motor Control H-Bridge Low-Side Switch |
Use Scenario: Input pre-regulation stage in wide-input buck converters for telecom power supplies. IC Role / Device Role / Timing Role: Medium-speed switching transistor in discrete step-down topology operating at 500 kHz. Use Value: 130MHz fT and fast turn-on (80 ns) support stable loop response; dual die permits interleaved operation for ripple reduction. | Use Scenario: Low-side gate driver stage for brushed DC motor control in medical pumps and lab equipment. IC Role / Device Role / Timing Role: Current-switching element sinking motor phase current with precise PWM timing. Use Value: High hFE minimizes base drive burden on MCU timers; 150°C max junction temperature supports sealed enclosure operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual NPN medium-power transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ZXTN2010G | Single NPN, SOT-23 package, VCEO = 100V, hFE = 300 @ 500mA, RθJA = 275 °C/W | Lacks dual-die redundancy and automotive qualification; lower voltage margin. | Use only where space constraints prohibit SM-8 and 100V rating suffices. |
| MBT3904DW1T1G | Dual NPN, SOT-363 package, VCEO = 40V, hFE = 300 @ 10mA, PD = 0.2 W | Not suitable for >40V systems; insufficient power handling for motor/relay loads. | Select only for low-voltage signal switching where dual channels are needed but power is sub-100mA. |
Compared with ZXTN2010G and MBT3904DW1T1G, ZDT694TA uniquely combines AEC-Q101 qualification, 120V capability, dual-die thermal independence, and 2.25W dissipation-making it the only viable option for automotive and industrial 48V+ switching where reliability and power density are co-constrained.
Availability
ZDT694TA is available at Aetrix Electronics and suitable for automotive LED drivers, industrial relay interfaces, DC-DC pre-regulators, and motor control H-bridge circuits requiring stable component supply across extended product lifecycles.
Supply support for ZDT694TA 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.
ZDT694TA belongs to Diodes' high-reliability bipolar transistor product line, engineered specifically for automotive and industrial applications demanding AEC-Q101 compliance, high-voltage robustness, and thermally efficient packaging.
FAQ
What is the thermal performance difference between single-die and dual-die operation?
When only one die is active, ZDT694TA delivers 2.25W PD with RθJA = 55.6 °C/W. With both die active and equally loaded, total PD increases to 2.75W and RθJA improves to 45.5 °C/W due to distributed heat flow across the SM-8 leadframe. This requires symmetrical PCB copper layout for optimal benefit.
Can ZDT694TA be used in linear amplifier configurations?
Yes-its minimum hFE of 400 at 200mA and VCE(sat) ≤ 0.50V support Class-A and AB amplifier topologies. However, linear use demands strict thermal management: maximum ambient must be limited to ≤ 75°C for 1W dissipation, and PCB copper area must exceed 500 mm² per die to maintain TJ < 125°C.
Is the ZDT694TA pinout compatible with standard SOT-223 footprints?
No-ZDT694TA uses the SM-8 package, an 8-lead variant distinct from 3-lead SOT-223. Its footprint requires dedicated land pattern per AP02002 (6.60 × 7.00 mm body, 4.59 mm e1 pitch). Standard SOT-223 pads will not align with pins 1–8 and risk solder bridging or open connections.
Does the "T694" marking indicate RoHS or automotive grade?
The "T694" top-side marking identifies the product type code and is common to both ZDT694TA (AEC-Q101 qualified) and ZDT694QTA (automotive PPAP-capable). RoHS and halogen-free status are confirmed by the "Green" designation in datasheet features-not by the marking itself.
ZDT694TA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SOT-223-8
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Transistor Type:
- 2 NPN (Dual)
- Current - Collector (Ic) (Max):
- 500mA
- Voltage - Collector Emitter Breakdown (Max):
- 120V
- Vce Saturation (Max) @ Ib, Ic:
- 500mV @ 5mA, 400mA
- Current - Collector Cutoff (Max):
- 100nA (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 400 @ 200mA, 2V
- Power - Max:
- 2.75W
- Frequency - Transition:
- 130MHz
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SM8
ZDT694TA FAQ
1.How can I place an order for ZDT694TA through Aetrix?
Please submit a Request for Quotation (RFQ) for ZDT694TA 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 ZDT694TA reliable?
The price and inventory of ZDT694TA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZDT694TA is usually 5 days.
3.What payment methods are accepted for ZDT694TA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZDT694TA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZDT694TA?
ZDT694TA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZDT694TA 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 ZDT694TA?
For technical support, including ZDT694TA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZDT694TA requirements.
6.How does Aetrix verify that ZDT694TA is sourced from the original manufacturer or authorized distributors?
All ZDT694TA 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 ZDT694TA meets industry standards.
7.What is the process for return or replacement of ZDT694TA?
All ZDT694TA units undergo pre-shipment inspection (PSI). If there is an issue with ZDT694TA, 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 ZDT694TA part is unused and in its original packaging.
Return procedure for ZDT694TA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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