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onsemi BC636ZL1
- Part No.:
- BC636ZL1
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-226-3, TO-92-3 (TO-226AA)
- Datasheet:
-
BC636ZL1.pdf
- Description:
- TRANS PNP 45V 0.5A TO92
- Quantity:
- Payment:
- Shipping:
Inventory:40,000
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Product details
Overview
BC636ZL1 from onsemi is a PNP silicon general-purpose amplifier transistor in TO-92 package, rated for −45 V VCEO, −0.5 A IC, 625 mW PD at TA = 25°C, and operating from −55°C to +150°C - used in low-power linear amplification and switching circuits in industrial control modules.
For engineers reviewing the BC636ZL1 datasheet, pinout, applications, or equivalent options, key selection considerations include its guaranteed hFE ≥ 25 at IC = −5 mA, VCE(sat) ≤ −0.25 V at IC = −500 mA/IB = −50 mA, and fT = 150 MHz - critical for audio preamp stages and relay drivers requiring stable DC gain and moderate RF response.
Technical Context
The BC636ZL1 operates as a medium-current, medium-voltage PNP bipolar junction transistor optimized for linear amplification and saturated switching. Its hFE range (25–250) supports bias stability across production lots, while its 150 MHz fT enables use in low-frequency signal amplification up to ~10 MHz with predictable gain roll-off.
Thermal design is constrained by RθJA = 200°C/W and RθJC = 83.3°C/W, requiring careful PCB copper area allocation when dissipating >300 mW. The −5.0 V VEBO rating limits base-emitter reverse bias tolerance in level-shifting configurations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | −45 Vdc - maximum collector-emitter voltage before breakdown under open-base conditions; defines safe operating voltage headroom in negative-rail circuits. |
| IC | −0.5 Adc - continuous collector current limit; sets maximum load drive capability in switching applications like LED or relay control. |
| PD @ TA = 25°C | 625 mW - maximum power dissipation at ambient temperature; requires derating by 5.0 mW/°C above 25°C for thermal reliability. |
| hFE (IC = −5 mA) | 25–250 - DC current gain range at low current; ensures sufficient base drive margin for predictable turn-on in amplifier bias networks. |
| fT | 150 MHz - transition frequency at IC = −50 mA; confirms usable bandwidth for audio and low-speed digital signal conditioning. |
| VCE(sat) | ≤ −0.25 V @ IC = −500 mA/IB = −50 mA - saturation voltage defining conduction loss in switch-mode operation; enables <125 mW collector loss at full rated current. |
| TJ Range | −55°C to +150°C - junction temperature operating window; supports deployment in automotive under-hood and industrial motor-control environments. |
Pinout & Package
BC636ZL1 is housed in a TO-92 plastic package (Case 29, Style 14), with leads arranged in straight-line configuration and epoxy-molded body for mechanical robustness and moisture resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Emitter) | Current sink terminal for PNP device | Connected to most positive rail in common-emitter configuration; must handle full load current and support stable biasing via external resistor network. |
| 2 (Base) | Control input for minority-carrier injection | Requires current-limited drive (typically −5 to −50 mA); polarity-sensitive - reverse connection risks permanent damage due to −5.0 V VEBO limit. |
| 3 (Collector) | Output current path to load | Connected to load and negative supply; voltage swing limited to −45 V; layout must minimize inductance to avoid switching overshoot. |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed hFE ≥ 25 at low current | Ensures reliable turn-on with minimal base drive in battery-powered sensor interfaces and microcontroller GPIO-driven switches. |
| VCE(sat) ≤ −0.25 V at high current | Reduces conduction losses below 125 mW in 500 mA relay driver stages, improving thermal margin without heatsinking. |
| fT = 150 MHz | Supports stable small-signal amplification up to 10 MHz with ≤3 dB gain drop, suitable for ultrasonic transducer drivers and analog front-end buffering. |
| RθJC = 83.3°C/W | Enables direct case-to-heatsink mounting in compact industrial enclosures where ambient temperature exceeds 70°C. |
| −55°C to +150°C operating range | Validates use in engine control units and power supply feedback loops exposed to wide thermal cycling without parameter drift. |
Applications
| Audio Pre-amplifier Stage | Relay Driver Circuit |
|---|---|
Use Scenario: Low-noise voltage amplification of microphone or sensor signals prior to ADC sampling in portable instrumentation. IC Role / Device Role / Timing Role: PNP BJT configured in common-emitter topology providing 20–40 dB mid-band voltage gain with DC-coupled biasing. Use Value: hFE ≥ 25 and fT = 150 MHz ensure stable gain flatness up to 5 MHz and low distortion at 1–2 VPP output swing. | Use Scenario: Driving 12 V/500 mA electromagnetic relays from 3.3 V or 5 V microcontroller outputs in PLC I/O modules. IC Role / Device Role / Timing Role: Saturated switch controlling relay coil current with forced β = 10 to guarantee hard saturation across temperature and process variation. Use Value: VCE(sat) ≤ −0.25 V minimizes coil power loss and self-heating, extending relay contact life and enabling compact PCB layout. |
| Linear Voltage Regulator Pass Element | Industrial Temperature Sensor Interface |
Use Scenario: Series pass transistor in adjustable 3-terminal linear regulators delivering up to 500 mA at <1% load regulation. IC Role / Device Role / Timing Role: PNP emitter-follower configured to source current from unregulated input to regulated output bus. Use Value: −45 V VCEO and 625 mW PD allow safe operation with 24 V input rails and 5–12 V outputs under full load and worst-case dropout. | Use Scenario: Signal conditioning stage for PT100 or thermistor bridges in factory-floor temperature monitoring nodes. IC Role / Device Role / Timing Role: Differential pair active load or current mirror component in precision op-amp front-end circuitry. Use Value: Tight hFE distribution and −55°C to +150°C TJ range maintain bridge excitation accuracy across harsh ambient conditions without calibration drift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PNP general-purpose transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BC636G | Same electrical specs; Pb-free, RoHS-compliant variant with enhanced moisture sensitivity level (MSL 1). | No functional change; preferred for new designs requiring lead-free assembly and IPC/JEDEC compliance. | Select BC636G when manufacturing requires RoHS-6 compliance and reflow profile adherence to MSL 1 handling. |
| PN2907A | Lower VCEO (−60 V), higher hFE min (100), same TO-92 package but different pinout (E-B-C vs E-C-B). | Not pin-compatible; requires PCB layout revision; better suited for high-gain bias networks than switching. | Choose PN2907A only if redesign allows pinout adaptation and higher DC gain is prioritized over direct replacement. |
Compared with BC636ZL1, BC636G offers identical performance with environmental compliance benefits, while PN2907A provides higher gain but demands board-level changes - making BC636ZL1 optimal for legacy-compatible, cost-sensitive linear and switching roles.
Availability
BC636ZL1 is available at Aetrix Electronics and suitable for industrial control systems, sensor interface modules, and low-power audio signal conditioning requiring stable component supply and long-term obsolescence management.
Supply support for BC636ZL1 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
onsemi (formerly ON Semiconductor) is a global semiconductor supplier focused on energy-efficient innovation for automotive, industrial, cloud, and IoT applications.
The BC636ZL1 belongs to onsemi's legacy general-purpose bipolar transistor family, designed for cost-sensitive, high-reliability linear amplification and switching in industrial and consumer equipment.
FAQ
What is the pin configuration of the BC636ZL1?
The BC636ZL1 uses a TO-92 package with Emitter-Collector-Base (ECB) pinout: Pin 1 = Emitter, Pin 2 = Base, Pin 3 = Collector. This matches the standard ECB arrangement defined in Case 29, and differs from CBE or BEC variants - incorrect orientation risks circuit malfunction or device failure.
Does the BC636ZL1 support operation at elevated temperatures?
Yes, the BC636ZL1 is rated for junction temperatures from −55°C to +150°C. Its thermal resistance RθJA = 200°C/W means it can sustain 625 mW dissipation only at TA ≤ 25°C; above that, derating by 5.0 mW/°C applies - e.g., max 500 mW at 50°C ambient.
What is the minimum hFE guaranteed for BC636ZL1 at IC = −5 mA?
The BC636ZL1 guarantees hFE ≥ 25 at IC = −5 mA, VCE = −2.0 V, and TA = 25°C. This minimum is validated per onsemi's BC636/D datasheet Rev. 1 and ensures predictable base current requirements in amplifier bias networks using BC636ZL1.
Can BC636ZL1 be used as a direct replacement for BC636 in existing designs?
Yes, BC636ZL1 is a packaging variant of BC636 - identical electrical specifications and pinout, differing only in shipping format (2000-unit ammo pack vs 5000-unit box). No schematic or layout changes are needed when substituting BC636ZL1 for BC636 in production or repair.
What is the maximum safe collector current for continuous DC operation of BC636ZL1?
The BC636ZL1 is rated for −0.5 A continuous collector current (IC) at TA = 25°C. At higher ambient temperatures or with inadequate PCB copper area, this must be reduced per the 5.0 mW/°C derating curve to prevent exceeding the 625 mW PD limit and thermal runaway.
BC636ZL1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA)
- Packaging:
- Bulk
- Product Status:
- Active
- Transistor Type:
- PNP
- Current - Collector (Ic) (Max):
- 500 mA
- Voltage - Collector Emitter Breakdown (Max):
- 45 V
- Vce Saturation (Max) @ Ib, Ic:
- 500mV @ 50mA, 500mA
- Current - Collector Cutoff (Max):
- 100nA (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 40 @ 150mA, 2V
- Power - Max:
- 625 mW
- Frequency - Transition:
- 150MHz
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-92 (TO-226)
BC636ZL1 FAQ
1.How can I place an order for BC636ZL1 through Aetrix?
Please submit a Request for Quotation (RFQ) for BC636ZL1 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 BC636ZL1 reliable?
The price and inventory of BC636ZL1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC636ZL1 is usually 5 days.
3.What payment methods are accepted for BC636ZL1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC636ZL1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BC636ZL1?
BC636ZL1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BC636ZL1 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 BC636ZL1?
For technical support, including BC636ZL1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC636ZL1 requirements.
6.How does Aetrix verify that BC636ZL1 is sourced from the original manufacturer or authorized distributors?
All BC636ZL1 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 BC636ZL1 meets industry standards.
7.What is the process for return or replacement of BC636ZL1?
All BC636ZL1 units undergo pre-shipment inspection (PSI). If there is an issue with BC636ZL1, 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 BC636ZL1 part is unused and in its original packaging.
Return procedure for BC636ZL1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BC636ZL1 Tags
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MMBT3906LT1G
onsemi
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MMBT3904LT1G
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MMBT3906-7-F
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MMBT3904-TP
Micro Commercial Co
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MMBT2222A-7-F
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BC846BLT1G
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BC847B,215
Nexperia USA Inc.
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SMMBT3904LT1G
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MMBTA06LT1G
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