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Diodes Incorporated ZTX694BSTZ
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- Part No.:
- ZTX694BSTZ
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- E-Line-3, Formed Leads
- Datasheet:
-
ZTX694BSTZ.pdf
- Description:
- TRANS NPN 120V 0.5A E-LINE
- Quantity:
- Payment:
- Shipping:
Inventory:9,802
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Product details
Overview
ZTX694BSTZ from Diodes Incorporated is an NPN silicon planar medium-power high-gain transistor designed for switching and linear amplification in low-to-medium current applications. It delivers VCEO = 120 V, hFE = 400 at IC = 200 mA, and VCE(sat) = 0.25 V (typ.) at IC = 100 mA / IB = 0.5 mA - enabling efficient relay/solenoid drive and battery-powered motor control.
For engineers reviewing the ZTX694BSTZ datasheet, ZTX694BSTZ pinout, ZTX694BSTZ application, or ZTX694BSTZ equivalent, key selection criteria include its 120 V breakdown rating, low saturation voltage under moderate drive, high DC current gain stability across 100–400 mA, and TO-92-compatible E-Line package thermal performance on standard PCB copper.
Technical Context
This transistor operates as a single NPN bipolar junction device optimized for medium-power switching with robust secondary breakdown immunity. Its fT = 130 MHz at IC = 50 mA / VCE = 5 V supports fast turn-on/turn-off in pulse-driven loads, while Cibo = 200 pF and Cobo = 9 pF reflect low capacitive loading for stable gain in driver stages.
The device features graded doping and planar construction to sustain Tj up to +200°C, with Rth(j-amb) = 175°C/W (free air) and 116°C/W (1-in² PCB copper), enabling reliable operation in thermally constrained industrial and automotive auxiliary circuits without forced cooling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 120 V - Supports direct switching of 100 V DC loads (e.g., solenoids, small motors) without external snubbing. |
| hFE | 400 @ IC=200 mA - Enables low-base-drive-current operation in Darlington configurations or microcontroller-driven switches. |
| VCE(sat) | 0.25 V (typ.) @ IC=100 mA/IB=0.5 mA - Reduces conduction loss to <25 mW in battery-powered logic-level drivers. |
| fT | 130 MHz @ IC=50 mA/VCE=5 V - Sufficient for PWM frequencies up to ~5 MHz with controlled rise/fall times. |
| Ptot | 1.5 W @ Tamb=25°C - Delivers continuous 500 mA collector current with adequate PCB copper heatsinking. |
| Rth(j-amb) | 116°C/W on 1-in² PCB copper - Limits junction temperature rise to ≤116°C at full 1.5 W dissipation in typical layout. |
Pinout & Package
Package: TO-92 compatible E-Line (3-lead plastic case, JEDEC TO-92 outline). Mounting requires ≥1 in² copper area on PCB for rated power dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| E (Emitter) | Current sink terminal | Reference node for base bias; connects to ground or low-side return path in common-emitter switches. |
| B (Base) | Control input | Accepts TTL/CMOS-compatible drive (IB ≈ 0.5–5 mA) to saturate or cut off the transistor reliably. |
| C (Collector) | Current source terminal | Connects to load supply rail; handles up to 1 A pulsed current with safe operating area compliance. |
Key Features
| Feature | Design Value |
|---|---|
| High VCEO rating | 120 V enables direct interface with 24–100 V industrial control buses without level-shifting. |
| Low VCE(sat) | 0.25 V typ. minimizes heat generation in battery-powered solenoid drivers operating at 100–400 mA. |
| Stable hFE over current range | hFE ≥ 400 at 200 mA ensures consistent gain in analog amplifier stages and feedback loops. |
| High fT | 130 MHz allows use in high-speed switching applications such as PWM motor controllers up to 1 MHz. |
| Wide Tj range | −55°C to +200°C operation supports deployment in under-hood automotive modules and industrial PLC outputs. |
Applications
| Relay/Solenoid Driver | Battery-Powered Motor Control |
|---|---|
Use Scenario: Driving 24–48 V DC relays or pneumatic solenoids from microcontroller GPIO pins. IC Role / Device Role / Timing Role: NPN switch providing current gain and voltage isolation between logic-level control and inductive load. Use Value: VCE(sat) ≤ 0.5 V at IC = 400 mA limits power loss to <200 mW, extending battery life in portable test equipment. | Use Scenario: Controlling brushed DC motors in handheld tools or medical pumps powered by Li-ion packs (7.4–12 V). IC Role / Device Role / Timing Role: Low-side switch regulating motor current via PWM at 20–100 kHz. Use Value: fT = 130 MHz ensures clean switching edges with ton/toff ≤ 80/2900 ns, reducing electromagnetic interference in sensitive analog subsystems. |
| Darlington Pair Pre-driver | Industrial Sensor Interface Output Stage |
Use Scenario: Serving as the first-stage driver in a high-voltage Darlington pair for AC solid-state relays. IC Role / Device Role / Timing Role: Provides initial current gain and voltage headroom before cascading to a higher-power output transistor. Use Value: VCEO = 120 V and hFE = 400 allow robust pre-driving of 400 V-rated output transistors with minimal base current overhead. | Use Scenario: Amplifying and buffering analog sensor signals (e.g., RTD, strain gauge bridges) into PLC analog input modules. IC Role / Device Role / Timing Role: Linear-mode emitter-follower buffer delivering low-output-impedance drive to 12-bit ADC front-ends. Use Value: hFE ≥ 500 at IC = 100 mA ensures stable open-loop gain and minimal signal distortion across −40°C to +85°C ambient. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar NPN medium-power switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ZTX653BSTZ | VCEO = 100 V, hFE = 300 @ 200 mA, Ptot = 1.25 W | Limited to ≤80 V load switching; lower gain reduces base drive margin in marginal drive conditions. | Select when 100 V rating suffices and cost sensitivity outweighs need for 120 V margin. |
| MJD112G | TO-220 package, VCEO = 100 V, hFE = 1000 @ 1 A, Ptot = 15 W | Requires heatsink; unsuitable for space-constrained TO-92 footprints but supports higher continuous current. | Choose for >500 mA continuous loads where board area permits larger package and thermal management. |
Compared with ZTX653BSTZ, the ZTX694BSTZ provides 20 V higher blocking voltage and 33% higher gain at 200 mA - critical for reliability in 100 V industrial bus interfaces. Against MJD112G, it trades higher power handling for compact size and lower drive requirements in embedded control nodes.
Availability
ZTX694BSTZ is available at Aetrix Electronics and suitable for relay/solenoid drivers, battery-powered motor controllers, Darlington pre-drivers, and industrial sensor interface output stages requiring stable component supply and long-term manufacturability.
Supply support for ZTX694BSTZ 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 components for industrial, automotive, and computing markets.
The ZTX694BSTZ belongs to Diodes' ZTX series of high-voltage, high-gain bipolar transistors engineered specifically for ruggedized switching and amplification in harsh-environment control systems.
FAQ
What is the maximum continuous collector current for ZTX694BSTZ at 70°C ambient?
At Tamb = 70°C, derating from 1.5 W at 25°C applies at 5.7 mW/°C. Power limit becomes 1.5 W − (5.7 mW × 45°C) = 1.24 W. With VCE(sat) ≈ 0.4 V at IC = 400 mA, max continuous IC is ~310 mA to stay within thermal limits on 1-in² copper.
Can ZTX694BSTZ be used in linear amplifier configurations?
Yes - its hFE stability (500 min at 100 mA, 400 typ at 200 mA) and low VCE(sat) support Class-A emitter-follower and common-emitter amplifiers. Thermal resistance must be managed: Rth(j-amb) = 116°C/W requires careful PCB copper layout to avoid gain drift above 85°C junction temperature.
Is ZTX694BSTZ RoHS compliant and halogen-free?
Yes - Diodes Incorporated confirms ZTX694BSTZ meets RoHS Directive 2011/65/EU and is certified halogen-free per IEC 61249-2-21. The "STZ" suffix denotes lead-free, green-compliant packaging with matte tin lead finish and no brominated flame retardants.
Does ZTX694BSTZ require a base resistor when driven directly from a 3.3 V MCU GPIO?
Yes - a base resistor is mandatory. For IC = 200 mA and hFE = 400, minimum IB = 0.5 mA. With VBE(sat) ≈ 0.9 V, a 4.7 kΩ resistor limits IB to ~0.51 mA from 3.3 V, ensuring saturation without overdriving the base region.
ZTX694BSTZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- E-Line-3, Formed Leads
- Packaging:
- Cut Tape (CT)
- Product Status:
- Active
- Transistor Type:
- NPN
- Current - Collector (Ic) (Max):
- 500 mA
- Voltage - Collector Emitter Breakdown (Max):
- 120 V
- 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:
- 1 W
- Frequency - Transition:
- 130MHz
- Operating Temperature:
- -55°C ~ 200°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- E-Line (TO-92 compatible)
ZTX694BSTZ FAQ
1.How can I place an order for ZTX694BSTZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ZTX694BSTZ 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 ZTX694BSTZ reliable?
The price and inventory of ZTX694BSTZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZTX694BSTZ is usually 5 days.
3.What payment methods are accepted for ZTX694BSTZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZTX694BSTZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZTX694BSTZ?
ZTX694BSTZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZTX694BSTZ 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 ZTX694BSTZ?
For technical support, including ZTX694BSTZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZTX694BSTZ requirements.
6.How does Aetrix verify that ZTX694BSTZ is sourced from the original manufacturer or authorized distributors?
All ZTX694BSTZ 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 ZTX694BSTZ meets industry standards.
7.What is the process for return or replacement of ZTX694BSTZ?
All ZTX694BSTZ units undergo pre-shipment inspection (PSI). If there is an issue with ZTX694BSTZ, 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 ZTX694BSTZ part is unused and in its original packaging.
Return procedure for ZTX694BSTZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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