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onsemi BZX84C27_D87Z
- Part No.:
- BZX84C27_D87Z
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX84C27_D87Z.pdf
- Description:
- DIODE ZENER 27V 350MW SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:2,690
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Product details
Overview
BZX84C27_D87Z from ON Semiconductor is a 27 V ±5% Zener diode in SOT-23 package, rated for 250 mW power dissipation at 25°C ambient, with typical zener impedance of 45 Ω at 5 mA and reverse leakage current ≤0.05 µA at 18.9 V, used for precision voltage regulation and overvoltage protection in low-power analog circuits.
For engineers reviewing the BZX84C27_D87Z datasheet, pinout, applications, or equivalent options, key selection criteria include zener voltage tolerance, dynamic impedance at operating current, thermal resistance (RJA = 465°C/W), junction temperature range (–55°C to +150°C), and SOT-23 footprint compatibility with space-constrained PCB layouts.
Technical Context
This device operates as a silicon planar epitaxial Zener diode, optimized for stable voltage reference and clamping in DC bias networks. It exhibits a negative temperature coefficient below 5 V and transitions to positive above ~6 V; at 27 V, its dVZ/dT is +21.4 mV/°C, enabling predictable drift compensation in temperature-sensitive references.
The BZX84C27_D87Z is characterized at three test currents (1 mA, 5 mA, 20 mA) to support design flexibility across load conditions. Its capacitance is 70 pF at 0 V reverse bias and 1 MHz, making it suitable for low-frequency stabilization but not RF bypassing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 25.1 V min / 28.9 V max at IZ = 5 mA - defines regulated output range under nominal bias |
| Zener Impedance (ZZ) | 45 Ω max at IZ = 5 mA - determines regulation stiffness and output ripple rejection |
| Power Dissipation (PD) | 250 mW at TA = 25°C - sets maximum continuous DC power in free-air convection |
| Junction-to-Ambient RJA | 465°C/W - implies ~116°C rise at full 250 mW, requiring derating above 25°C ambient |
| Reverse Leakage (IR) | ≤0.05 µA at VR = 18.9 V - ensures minimal quiescent current in high-impedance bias networks |
| Tempco (dVZ/dT) | +21.4 mV/°C at IZ = 5 mA - enables predictable voltage shift over industrial temperature range |
Pinout & Package
Package: SOT-23 (TO-236AB), 3-terminal surface-mount plastic package with cathode-marked lead. Standard pin assignment applies across BZX84C series.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower potential node in reverse-biased Zener operation; carries forward current up to 250 mA peak |
| Cathode | Zener breakdown terminal | Connected to higher potential node; defines regulated voltage at cathode relative to anode during reverse bias |
| Case / Lead 3 | Thermal path (cathode-connected) | Provides primary heat conduction path to PCB copper; JL = 220°C/W referenced to cathode |
Key Features
| Feature | Design Value |
|---|---|
| ±5% Zener voltage tolerance | Ensures tight regulation band without post-manufacture trimming; supports cost-sensitive production without calibration |
| Low leakage at rated VR | 0.05 µA max at 18.9 V enables use in microamp-level bias chains without loading error |
| SOT-23 footprint compatibility | Standard 2.9 mm × 1.3 mm outline allows drop-in replacement in existing 3-pin discrete layouts |
| 150°C max junction temperature | Supports operation in sealed enclosures or near heat sources without thermal shutdown risk |
Applications
| Industrial Sensor Signal Conditioning | USB Port Overvoltage Clamp |
|---|---|
Use Scenario: Stabilizing reference voltage for 12-bit ADC front-end in temperature transmitters. IC Role / Device Role / Timing Role: Precision shunt voltage reference providing 27 V rail for op-amp bias and DAC reference scaling. Use Value: Tight 5% tolerance and +21.4 mV/°C tempco allow calibrated offset correction across –40°C to +85°C operating range. | Use Scenario: Protecting USB 2.0 data lines from ESD-induced voltage spikes exceeding 20 V. IC Role / Device Role / Timing Role: Fast-acting shunt clamp limiting transient voltage to ≤28.9 V before TVS activation. Use Value: 70 pF capacitance avoids signal integrity degradation on 480 Mbps differential pairs while clamping within USB spec limits. |
| Programmable Logic Supply Monitor | Isolated DC-DC Feedback Divider |
Use Scenario: Detecting undervoltage condition on 24 V PLC I/O module supply rail. IC Role / Device Role / Timing Role: Threshold detector feeding comparator input when rail drops below 25.1 V. Use Value: Low 0.05 µA leakage prevents false triggering in high-impedance resistor-divider networks. | Use Scenario: Setting regulated output voltage in flyback converter with optocoupler feedback. IC Role / Device Role / Timing Role: Primary-side voltage reference defining 27 V output via resistive divider into TL431 control loop. Use Value: Stable 250 mW dissipation rating supports continuous operation under 100% load without thermal runaway. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBZ5256BS-7-F | Zener voltage 27 V ±5%, PD = 200 mW, RJA = 500°C/W, C = 75 pF | Lower power rating reduces margin in sustained overload; higher thermal resistance requires stricter layout control | Select when footprint compatibility with Diodes Inc. standard SOT-23-3 is required and 200 mW suffices |
| 1N4750A | Through-hole DO-41 package, 27 V ±5%, PD = 1 W, RJA ≈ 50°C/W | Not surface-mountable; unsuitable for automated assembly or dense PCBs | Select only for prototyping, repair, or legacy through-hole designs where thermal mass outweighs size constraints |
Compared with MMBZ5256BS-7-F and 1N4750A, the BZX84C27_D87Z offers optimal balance of SMT manufacturability, 250 mW power headroom, and predictable +21.4 mV/°C tempco-making it preferred for volume production of compact industrial electronics where thermal and layout constraints dominate.
Availability
BZX84C27_D87Z is available at Aetrix Electronics and suitable for industrial sensor conditioning, USB port protection, programmable logic supply monitoring, and isolated DC-DC feedback divider applications requiring stable component supply and long-term obsolescence management.
Supply support for BZX84C27_D87Z 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
ON Semiconductor is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud computing, medical, and IoT applications.
The BZX84C series belongs to ON Semiconductor's general-purpose Zener diode product line, designed specifically for cost-effective, space-efficient voltage regulation and transient suppression in consumer and industrial electronics.
FAQ
What is the exact zener voltage range for BZX84C27_D87Z at 5 mA test current?
The BZX84C27_D87Z has a specified zener voltage range of 25.1 V minimum to 28.9 V maximum when tested at IZ = 5 mA and TA = 25°C. This 5% tolerance band is guaranteed per unit and reflects the device's factory calibration without binning. The BZX84C27_D87Z achieves this performance using planar epitaxial construction and laser-trimmed process control.
Can BZX84C27_D87Z be used in place of a 24 V zener diode like BZX84C24?
No-BZX84C27_D87Z is not interchangeable with BZX84C24 due to its distinct 27 V nominal zener voltage and different temperature coefficient (+21.4 mV/°C vs. +18.4 mV/°C). Substituting BZX84C27_D87Z would raise regulated voltage by ~3 V, potentially violating downstream IC absolute maximum ratings. Always verify voltage setpoint and tempco alignment before cross-referencing within the BZX84C family.
What is the maximum allowable junction temperature for BZX84C27_D87Z?
The BZX84C27_D87Z has a maximum operating junction temperature of +150°C, consistent with its silicon planar epitaxial process and SOT-23 package construction. This limit must be respected under all operating conditions-including pulsed loads-and requires thermal derating based on RJA = 465°C/W. Exceeding 150°C risks irreversible parametric shift or catastrophic failure.
Does BZX84C27_D87Z have a specified forward voltage?
Yes-the BZX84C27_D87Z has a maximum forward voltage of 0.9 V at IF = 10 mA, as confirmed in the Fairchild/ON Semiconductor datasheet. This parameter applies when the device is operated in forward conduction mode (anode positive relative to cathode), such as in polarity protection or LED driver bias paths-not during normal Zener regulation.
How does the 70 pF capacitance of BZX84C27_D87Z affect high-speed circuit design?
The BZX84C27_D87Z exhibits 70 pF capacitance at 0 V reverse bias and 1 MHz, which makes it unsuitable for clamping fast digital signals (e.g., USB HS, HDMI, PCIe) where sub-5 pF is typically required. However, this value is appropriate for low-frequency analog references and slow-supply monitoring, where capacitive loading does not degrade bandwidth or cause ringing.
BZX84C27_D87Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 27 V
- Tolerance:
- ±7%
- Power - Max:
- 350 mW
- Impedance (Max) (Zzt):
- 80 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 18.9 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- -55°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
BZX84C27_D87Z FAQ
1.How can I place an order for BZX84C27_D87Z through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84C27_D87Z 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 BZX84C27_D87Z reliable?
The price and inventory of BZX84C27_D87Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84C27_D87Z is usually 5 days.
3.What payment methods are accepted for BZX84C27_D87Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84C27_D87Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84C27_D87Z?
BZX84C27_D87Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84C27_D87Z 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 BZX84C27_D87Z?
For technical support, including BZX84C27_D87Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84C27_D87Z requirements.
6.How does Aetrix verify that BZX84C27_D87Z is sourced from the original manufacturer or authorized distributors?
All BZX84C27_D87Z 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 BZX84C27_D87Z meets industry standards.
7.What is the process for return or replacement of BZX84C27_D87Z?
All BZX84C27_D87Z units undergo pre-shipment inspection (PSI). If there is an issue with BZX84C27_D87Z, 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 BZX84C27_D87Z part is unused and in its original packaging.
Return procedure for BZX84C27_D87Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84C27_D87Z Tags
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MMBZ5240B-7-F
Diodes Incorporated
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BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
Diodes Incorporated
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BZT52C15-7-F
Diodes Incorporated
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BZX84C3V3LT1G
onsemi
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MMSZ5245BS-7-F
Diodes Incorporated
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onsemi
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BZT52C15S-7-F
Diodes Incorporated
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Micro Commercial Co
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