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Diodes Incorporated ZTX690BSTOA
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- Part No.:
- ZTX690BSTOA
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- E-Line-3, Formed Leads
- Datasheet:
-
ZTX690BSTOA.pdf
- Description:
- TRANS NPN 45V 2A E-LINE
- Quantity:
- Payment:
- Shipping:
Inventory:4,736
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Product details
Overview
ZTX690BSTOA from Diodes Incorporated is an NPN silicon planar medium-power high-gain transistor with VCEO = 45 V, hFE = 400 at IC = 1 A, and VCE(sat) = 0.1 V (typ.) at IC = 0.1 A / IB = 0.5 mA - used in siren drivers, battery-powered motor control stages, and Darlington pair emitter followers.
For engineers reviewing the ZTX690BSTOA datasheet, ZTX690BSTOA pinout, ZTX690BSTOA application, or ZTX690BSTOA equivalent, key selection criteria include saturation voltage under 100 mA drive, gain stability up to 2 A DC current, thermal resistance of 116 °C/W (PCB-mounted), and TO-92-compatible leadform compatibility with legacy E-Line footprints.
Technical Context
This transistor operates as a linear or switching NPN amplifier with specified breakdown voltages (VCEO, VCBO, VEBO) all rated at 45 V, 45 V, and 5 V respectively, enabling use in 24–36 V battery-fed loads. Its fT = 150 MHz supports fast-switching applications such as PWM-driven motor interfaces.
The device delivers low VCE(sat) across IC = 0.1–1 A range and maintains hFE ≥ 150 up to IC = 2 A, supporting robust current amplification in Class-A/B output stages and relay/solenoid interface circuits without external heat sinking below 1 W dissipation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 45 V - maximum collector-emitter voltage before avalanche; sets safe operating limit for 24 V automotive or industrial supply rails. |
| hFE @ IC=1 A | 400 - current gain at 1 A collector current; enables base drive reduction in high-current switching nodes. |
| VCE(sat) @ IC=0.1 A | 0.1 V (typ.) - low saturation voltage minimizes power loss in battery-critical load switches. |
| fT | 150 MHz - transition frequency supports clean 50 kHz PWM edge integrity with minimal rise/fall time degradation. |
| Rth(j-amb) (PCB) | 116 °C/W - thermal resistance on 1-inch² copper PCB; allows ~1.3 W continuous dissipation at Tamb = 70°C. |
| IC (continuous) | 2 A - maximum DC collector current; supports sustained motor stall or solenoid hold conditions. |
Pinout & Package
Package: TO-92 variant (E-Line compatible, 3-238 outline), molded plastic case with axial leads. Mounting requires minimum 1 inch² copper area for rated Ptot = 1.5 W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Emitter (E) | Current sink node | Connected to ground or low-side return path; lowest impedance terminal for high-current discharge paths. |
| Base (B) | Control input | Receives current-limited drive (IB ≤ 5 mA typical); requires series resistor to limit IB per hFE target. |
| Collector (C) | Current source node | Connects to load and positive rail; handles full load current and must be routed with adequate trace width. |
Key Features
| Feature | Design Value |
|---|---|
| High DC current gain | hFE = 400 @ IC = 1 A reduces required base drive current by >2× vs. standard general-purpose transistors. |
| Low VCE(sat) | 0.1 V typ. at IC = 0.1 A cuts conduction loss to <10 mW in low-power switching nodes. |
| Wide safe operating area | Rated for 2 A DC and 6 A pulse; supports inductive kickback handling in relay/motor driver outputs. |
| High-temperature operation | Junction rating up to +200°C enables use in sealed enclosures or near heat sources without derating. |
Applications
| Siren Driver Stage | Battery-Powered Motor Control |
|---|---|
Use Scenario: High-current audio-frequency switching in vehicle alarm siren modules powered from 12 V lead-acid batteries. IC Role / Device Role / Timing Role: NPN switch driving piezoelectric or electromagnetic transducer load with 500 mA–1 A peak current. Use Value: Low VCE(sat) preserves battery runtime; high hFE simplifies microcontroller GPIO drive without additional buffer stage. | Use Scenario: Directional DC motor H-bridge half-bridge output stage in portable tools or robotics with 3.7–24 V Li-ion or alkaline supplies. IC Role / Device Role / Timing Role: Low-side switching element controlling motor current flow during PWM duty cycles. Use Value: 150 MHz fT ensures sharp PWM edges at 20 kHz; SOA supports stall current surges without secondary breakdown. |
| Darlington Pair Emitter Follower | Industrial Relay Interface |
Use Scenario: First-stage emitter follower in high-input-impedance Darlington configuration for PLC output modules. IC Role / Device Role / Timing Role: Voltage-buffering pre-driver delivering stable base current to main Darlington transistor. Use Value: Gain of 400 at 1 A enables precise current mirroring; low VBE(sat) = 0.9 V improves overall stage efficiency. | Use Scenario: Solid-state replacement for electromechanical relays in HVAC control panels operating from 24 V AC/DC rails. IC Role / Device Role / Timing Role: Load switch isolating microcontroller I/O from inductive relay coil (≈100 mA, 24 V). Use Value: VCEO = 45 V exceeds 24 V system margin; Rth(j-amb) = 116 °C/W permits direct PCB mounting without heatsink. |
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 |
|---|---|---|---|
| ZTX653BSTOA | VCEO = 60 V, hFE = 250 @ 1 A, higher VCE(sat) = 0.25 V | Better voltage margin but lower gain and higher conduction loss | Select when system rail exceeds 40 V or surge immunity is critical over gain efficiency. |
| BCX56-16 | TO-92, VCEO = 80 V, hFE = 160 @ 500 mA, Ptot = 1 W | Higher voltage rating but lower current capability and thermal performance | Prefer for low-current logic-level switching where voltage headroom >60 V is required. |
Compared with ZTX653BSTOA and BCX56-16, ZTX690BSTOA offers superior gain-to-saturation trade-off at 1 A, tighter thermal resistance on PCB, and optimized balance for battery-constrained 24 V motor/siren loads - making it the preferred choice where efficiency and compact layout are prioritized.
Availability
ZTX690BSTOA is available at Aetrix Electronics and suitable for siren drivers, battery-powered motor control, Darlington pre-drivers, and industrial relay interfaces requiring stable component supply across production lifecycles.
Supply support for ZTX690BSTOA 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 centers across Asia and manufacturing in China, Taiwan, and Malaysia.
ZTX690BSTOA belongs to the ZTX series of high-gain, medium-power bipolar transistors engineered for industrial and automotive-grade switching and amplification in space-constrained, thermally demanding environments.
FAQ
What is the maximum continuous collector current for ZTX690BSTOA?
The maximum continuous collector current is 2 A at Tamb = 25°C with proper PCB copper area (1 inch² minimum). Derating applies above 25°C at 5.7 mW/°C, limiting usable current to ~1.3 A at 70°C ambient with standard mounting.
Can ZTX690BSTOA replace a BC548 in a 12 V switching circuit?
No - BC548 is a low-power general-purpose transistor (IC = 100 mA, VCEO = 30 V). ZTX690BSTOA is rated for 2 A and 45 V, requiring revised base drive (≥5 mA) and PCB layout (copper area, trace width). It is not a drop-in replacement without circuit redesign.
Is ZTX690BSTOA suitable for PWM motor control at 20 kHz?
Yes - its fT = 150 MHz and fast switching times (ton = 33 ns, toff = 1300 ns) support clean 20 kHz PWM operation. Ensure gate/base drive strength matches hFE requirements and layout minimizes inductive ringing on collector traces.
Does ZTX690BSTOA have built-in ESD protection?
No - the datasheet does not specify any integrated ESD protection diodes. External TVS or RC snubbers are recommended for inductive load switching, especially in automotive or industrial environments with load dump or back-EMF transients.
ZTX690BSTOA 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)
ZTX690BSTOA FAQ
1.How can I place an order for ZTX690BSTOA through Aetrix?
Please submit a Request for Quotation (RFQ) for ZTX690BSTOA 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 ZTX690BSTOA reliable?
The price and inventory of ZTX690BSTOA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZTX690BSTOA is usually 5 days.
3.What payment methods are accepted for ZTX690BSTOA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZTX690BSTOA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZTX690BSTOA?
ZTX690BSTOA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZTX690BSTOA 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 ZTX690BSTOA?
For technical support, including ZTX690BSTOA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZTX690BSTOA requirements.
6.How does Aetrix verify that ZTX690BSTOA is sourced from the original manufacturer or authorized distributors?
All ZTX690BSTOA 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 ZTX690BSTOA meets industry standards.
7.What is the process for return or replacement of ZTX690BSTOA?
All ZTX690BSTOA units undergo pre-shipment inspection (PSI). If there is an issue with ZTX690BSTOA, 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 ZTX690BSTOA part is unused and in its original packaging.
Return procedure for ZTX690BSTOA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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