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Diodes Incorporated ZTX690BSTOB
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- Part No.:
- ZTX690BSTOB
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- E-Line-3, Formed Leads
- Datasheet:
-
ZTX690BSTOB.pdf
- Description:
- TRANS NPN 45V 2A E-LINE
- Quantity:
- Payment:
- Shipping:
Inventory:8,647
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Product details
Overview
ZTX690BSTOB from Diodes Incorporated is an NPN silicon planar medium-power high-gain transistor rated for 45 V VCEO, 2 A continuous collector current, and 400 hFE at IC = 1 A; it delivers 0.1 V typical VCE(sat) at IC = 0.1 A / IB = 0.5 mA and operates from –55°C to +200°C junction temperature - used in siren drivers and battery-powered motor control stages.
For engineers reviewing the ZTX690BSTOB datasheet, ZTX690BSTOB pinout, ZTX690BSTOB application, or ZTX690BSTOB equivalent, key selection criteria include verified VCE(sat) performance at low base drive, thermal resistance of 116°C/W (junction-to-ambient on 1-in² PCB), and guaranteed hFE ≥ 500 at IC = 100 mA for Darlington pair biasing.
Technical Context
This discrete NPN bipolar junction transistor employs a planar epitaxial structure optimized for medium-power linear and switching operation. It supports DC and pulsed collector currents up to 2 A and 6 A respectively, with fT = 150 MHz at IC = 50 mA, enabling use in audio-frequency amplification and fast-switching loads.
Its low VCE(sat) (0.1–0.5 V) across IC = 0.1–1 A and VBE(sat) = 0.9 V at IC = 1 A / IB = 10 mA ensure efficient power stage operation with minimal conduction loss in battery-constrained systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 45 V - maximum safe collector-emitter voltage under open-base conditions; defines upper rail limit in motor driver or siren output stage |
| IC (continuous) | 2 A - sustained collector current capability; determines heatsink sizing for 12 V/24 V DC motor interfaces |
| hFE @ IC=1 A | 400 - current gain at full-load condition; enables low-base-drive design for compact Darlington configurations |
| VCE(sat) @ IC=1 A | 0.5 V max - saturation voltage defining conduction loss; yields ≤0.5 W dissipation at 1 A load |
| fT | 150 MHz - transition frequency confirming usable bandwidth up to ~10–20 MHz in switching applications |
| Rth(j-amb) | 116 °C/W - thermal resistance on 1-in² PCB copper; sets temperature rise of ~116°C per watt at ambient mounting |
Pinout & Package
Package: TO-92 (E-Line compatible, 3-238 outline), plastic through-hole with standard C-B-E lead assignment (viewed from flat side, leads down: Emitter–Base–Collector).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Emitter (E) | Current sink terminal | Connected to ground or low-side return path; carries full load current and sets reference for base bias network |
| Base (B) | Control input | Receives current-limited drive (e.g., via resistor from MCU GPIO); controls collector current with hFE-dependent gain |
| Collector (C) | Current source terminal | Connected to load (e.g., motor coil or siren transducer); handles switched high-side or low-side power delivery |
Key Features
| Feature | Design Value |
|---|---|
| High DC current gain | hFE ≥ 500 at IC = 100 mA - reduces base drive requirements in low-power control circuits |
| Low saturation voltage | VCE(sat) = 0.1 V typ. @ IC = 0.1 A - minimizes power loss in battery-operated siren and alarm outputs |
| Wide operating temperature | –55°C to +200°C Tj - supports under-hood automotive and industrial environments without derating |
| Fast switching | ton = 33 ns, toff = 1300 ns - enables reliable operation in 10–50 kHz PWM-driven motor interfaces |
Applications
| Siren Driver Stage | Battery-Powered Motor Control |
|---|---|
Use Scenario: High-current audio-frequency switching in electronic alarm systems powered by 9–24 V batteries. IC Role / Device Role / Timing Role: NPN switch driving piezoelectric or electromagnetic siren transducers with pulsed 1–5 kHz waveforms. Use Value: Low VCE(sat) ensures >95% efficiency at 1 A peak load, extending battery life in portable security devices. | Use Scenario: Low-voltage DC motor interface in handheld tools or medical pumps requiring compact, thermally robust switching. IC Role / Device Role / Timing Role: Medium-power NPN switch in half-bridge or single-ended motor driver stage with PWM input. Use Value: 2 A continuous rating and 116°C/W thermal resistance enable operation without heatsink at 1.5 W dissipation in sealed enclosures. |
| Darlington Pair Input Stage | Industrial Sensor Interface Output |
Use Scenario: First-stage amplifier in high-gain Darlington configuration for analog sensor signal conditioning or relay driver circuits. IC Role / Device Role / Timing Role: High-hFE (≥500) NPN providing precise base current multiplication to drive second-stage power transistor. Use Value: Guaranteed hFE at IC = 100 mA allows predictable current transfer ratio and stable bias point across temperature. | Use Scenario: Output stage for industrial 4–20 mA loop transmitter or digital I/O module driving solenoids or indicator LEDs. IC Role / Device Role / Timing Role: Robust NPN switch interfacing microcontroller outputs to higher-current field loads with galvanic isolation. Use Value: 45 V VCEO and –55°C to +200°C rating support operation in harsh factory-floor environments with wide supply fluctuations. |
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 |
|---|---|---|---|
| ZTX653BSTOB | VCEO = 60 V, hFE = 250 @ IC = 1 A, Rth(j-amb) = 125°C/W | Higher breakdown margin but lower gain; suited for 48 V systems with less critical base drive | Select when system voltage exceeds 45 V but gain requirements are relaxed |
| BCX56-16 | VCEO = 45 V, hFE = 100–250 @ IC = 1 A, Ptot = 1.25 W | Lower power rating and gain; limited to <1.25 W dissipation and <1.5 A continuous current | Choose only for cost-sensitive, low-duty-cycle applications where thermal headroom is ample |
Compared with ZTX690BSTOB, ZTX653BSTOB trades gain for higher voltage tolerance, while BCX56-16 offers lower cost at reduced thermal and current capability - making ZTX690BSTOB optimal for high-efficiency, high-gain, medium-power switching where 45 V and 2 A are design limits.
Availability
ZTX690BSTOB is available at Aetrix Electronics and suitable for siren drivers, battery-powered motor control, and industrial sensor interface output stages requiring stable component supply and extended temperature operation.
Supply support for ZTX690BSTOB 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, focused on high-reliability power management, signal integrity, and protection solutions.
ZTX690BSTOB belongs to the ZTX series of high-gain, medium-power bipolar transistors designed specifically for demanding linear and switching applications in automotive, industrial, and consumer equipment where thermal robustness and consistent DC gain are critical.
FAQ
What is the maximum safe continuous collector current for ZTX690BSTOB?
The maximum continuous collector current is 2 A at Tamb = 25°C with proper PCB copper area (≥1 in²). At elevated ambient temperatures, derating applies: power dissipation drops linearly above 25°C at 5.7 mW/°C, limiting usable IC in enclosed or high-temperature environments.
Can ZTX690BSTOB be used in a Darlington configuration?
Yes - its minimum hFE of 500 at IC = 100 mA makes it ideal as the input transistor in a Darlington pair. Paired with a complementary high-current device (e.g., ZTX653BSTOB), it provides precise base current multiplication while maintaining low saturation voltage in the composite output stage.
What is the thermal resistance junction-to-ambient for ZTX690BSTOB?
Rth(j-amb) is 116°C/W when mounted on a PCB with ≥1 in² of copper. This value assumes standard FR-4 board and natural convection cooling; forced airflow or additional copper planes can reduce effective thermal resistance by up to 30%.
Does ZTX690BSTOB have a specified transition frequency?
Yes - fT is 150 MHz at IC = 50 mA, VCE = 5 V, and f = 50 MHz. This confirms suitability for audio-frequency amplification and switching applications up to ~20 MHz, though practical circuit bandwidth depends on layout parasitics and load impedance.
ZTX690BSTOB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- E-Line-3, Formed Leads
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Transistor Type:
- NPN
- Current - Collector (Ic) (Max):
- 2 A
- Voltage - Collector Emitter Breakdown (Max):
- 45 V
- Vce Saturation (Max) @ Ib, Ic:
- 500mV @ 5mA, 1A
- Current - Collector Cutoff (Max):
- 100nA (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 400 @ 1A, 2V
- Power - Max:
- 1 W
- Frequency - Transition:
- 150MHz
- Operating Temperature:
- -55°C ~ 200°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- E-Line (TO-92 compatible)
ZTX690BSTOB FAQ
1.How can I place an order for ZTX690BSTOB through Aetrix?
Please submit a Request for Quotation (RFQ) for ZTX690BSTOB 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 ZTX690BSTOB reliable?
The price and inventory of ZTX690BSTOB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZTX690BSTOB is usually 5 days.
3.What payment methods are accepted for ZTX690BSTOB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZTX690BSTOB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZTX690BSTOB?
ZTX690BSTOB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZTX690BSTOB 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 ZTX690BSTOB?
For technical support, including ZTX690BSTOB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZTX690BSTOB requirements.
6.How does Aetrix verify that ZTX690BSTOB is sourced from the original manufacturer or authorized distributors?
All ZTX690BSTOB 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 ZTX690BSTOB meets industry standards.
7.What is the process for return or replacement of ZTX690BSTOB?
All ZTX690BSTOB units undergo pre-shipment inspection (PSI). If there is an issue with ZTX690BSTOB, 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 ZTX690BSTOB part is unused and in its original packaging.
Return procedure for ZTX690BSTOB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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