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onsemi BZX85C27RL
- Part No.:
- BZX85C27RL
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
BZX85C27RL.pdf
- Description:
- DIODE ZENER 27V 1.3W 7.04% UNI
- Quantity:
- Payment:
- Shipping:
Inventory:18,000
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Product details
Overview
BZX85C27RL from ON Semiconductor is a 1 W, 27 V ±5% Zener voltage regulator diode in a DO-41 (DO-204AL) hermetically sealed glass package, featuring 8 mA test current (IZT), 750 Ω maximum dynamic impedance at IZT, and 0.25 µA maximum leakage current at 19 V reverse bias - used for precision voltage reference and overvoltage protection in power supply feedback loops.
For engineers reviewing the BZX85C27RL datasheet, pinout, applications, or equivalent options, key selection criteria include zener tolerance (±5%), thermal coefficient (+10 mV/°C typical for 27 V), surge capability (170 W peak, 1/120 s), lead temperature derating (6.67 mW/°C above 50°C), and DO-41 mechanical robustness in industrial environments.
Technical Context
The BZX85C27RL employs an oxide-passivated silicon junction with metallurgical bonded double-slug construction, enabling stable regulation under sustained 1 W dissipation at TL ≤ 50°C. Its zener voltage is specified at 40 ±10 ms pulse width with lead temperature controlled to 30°C ±1°C, ensuring reproducible measurement conditions.
Zener impedance (ZZT = 750 Ω max @ IZT = 8 mA) and low leakage (IR = 0.25 µA @ VR = 19 V) reflect optimized junction design for low-noise reference use. Temperature coefficient is +10 mV/°C (typical), consistent with 27 V devices in the BZX85C series per Figure 2 of the datasheet.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 25.1–28.9 V @ IZT = 8 mA; ±5% tolerance ensures predictable clamping in feedback networks. |
| Power Dissipation (PD) | 1 W @ TL ≤ 50°C; derates linearly to zero at ~200°C - defines thermal layout constraints on PCB leads. |
| Zener Impedance (ZZT) | 750 Ω max @ IZT = 8 mA; impacts regulation stability under varying load current. |
| Leakage Current (IR) | 0.25 µA max @ VR = 19 V; critical for low-power standby circuits where quiescent current must be minimized. |
| Surge Capability | 170 W peak (1/120 s, non-repetitive); supports transient suppression without device failure during line surges. |
| ESD Rating | Class 3 (>16 kV HBM); enables handling in standard assembly environments without special ESD controls. |
| Operating Temp Range | –65°C to +200°C; suitable for under-hood automotive and high-temp industrial applications. |
Pinout & Package
DO-41 (DO-204AL) axial-lead hermetically sealed glass package with cathode indicated by a painted band. Double-slug construction provides mechanical robustness and improved thermal conduction from junction to leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference ground | Connected to circuit ground or lower-potential node; forms reference return path in shunt regulator topology. |
| Cathode | Zener breakdown terminal / regulated output node | Connected to unregulated input; clamps voltage to 27 V when reverse-biased beyond breakdown threshold. |
Key Features
| Feature | Design Value |
|---|---|
| Oxide-passivated junction | Enables stable long-term VZ drift < 1% over 1000 hrs at rated power, critical for calibration references. |
| Hermetic glass seal | Prevents moisture ingress and corrosion in humid or chemically aggressive environments (IPC-J-STD-020 compliant). |
| Double-slug metallurgical bond | Reduces thermal resistance (θJL ≈ 100°C/W @ L = 3/8″), improving power handling vs. single-slug alternatives. |
| Class 3 ESD rating | Eliminates need for external ESD protection in board-level assembly, reducing BOM count and layout area. |
| –65°C to +200°C operation | Supports deployment in engine control units, downhole tools, and aerospace power converters without derating. |
Applications
| Switch-Mode Power Supply Feedback | Overvoltage Protection Clamp |
|---|---|
Use Scenario: Shunt regulator in secondary-side feedback loop of isolated DC-DC converter. IC Role / Device Role / Timing Role: Provides precise 27 V reference to optocoupler input, enabling tight output voltage regulation. Use Value: ±5% VZ tolerance and low ZZT ensure < ±1.5% output variation across line/load/temperature - meeting telecom power spec GR-1252. |
Use Scenario: Clamping circuit protecting microcontroller I/O pins from 30 V transients. IC Role / Device Role / Timing Role: Fast-acting shunt limiter diverting surge current away from sensitive logic inputs. Use Value: 170 W non-repetitive surge rating absorbs 100 ns–1 ms spikes without degradation, exceeding IEC 61000-4-5 Level 3. |
| Industrial Sensor Excitation | Calibration Reference Source |
Use Scenario: Stable excitation voltage for 4–20 mA current-loop pressure transmitters. IC Role / Device Role / Timing Role: Supplies regulated 27 V bias to bridge sensor and instrumentation amplifier. Use Value: +10 mV/°C tempco allows compensation via software lookup table, achieving < 0.05% FS error over –40°C to +85°C. |
Use Scenario: On-board voltage reference for 16-bit ADC in portable test equipment. IC Role / Device Role / Timing Role: Low-leakage (0.25 µA) reference node minimizing input bias error in precision op-amp buffers. Use Value: IR < 0.25 µA at 19 V ensures < 1 LSB error contribution in 10 V full-scale, 65 kΩ input impedance systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4750A | 27 V ±5%, 1 W, DO-41, but higher ZZT (1000 Ω max @ 8 mA) and no Class 3 ESD rating. | Lacks ESD robustness for automated assembly lines; higher impedance reduces regulation accuracy under dynamic loads. | Acceptable where ESD control is already implemented and tighter regulation not required. |
| BZX55C27 | 27 V ±5%, 500 mW, DO-35, lower power rating and smaller thermal mass - limits continuous dissipation to 0.5 W. | Not suitable for 1 W sustained operation; requires larger heatsinking or derating in compact enclosures. | Preferred only for space-constrained designs where peak power < 0.5 W and ambient temperature is low. |
Compared with BZX85C27RL, the 1N4750A offers identical voltage but inferior regulation stability and ESD immunity, while the BZX55C27 sacrifices power handling for size - making BZX85C27RL the optimal choice for industrial-grade 1 W reference and clamp applications requiring reliability and thermal margin.
Availability
BZX85C27RL is available at Aetrix Electronics and suitable for switch-mode power supplies, overvoltage protection circuits, and industrial sensor excitation systems requiring stable component supply, long-lifecycle support, and traceable sourcing.
Supply support for BZX85C27RL 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 manufacturer specializing in energy-efficient power management, analog, sensors, and connectivity solutions for automotive, industrial, and cloud power applications.
The BZX85C27RL belongs to the BZX85C series of 1 W Zener regulators designed for high-reliability voltage reference and transient suppression in harsh-environment electronics - emphasizing hermetic sealing, wide temperature range, and process-controlled parametric consistency.
FAQ
What is the zener voltage tolerance for BZX85C27RL?
The BZX85C27RL has a nominal zener voltage of 27 V with a guaranteed minimum of 25.1 V and maximum of 28.9 V at IZT = 8 mA, corresponding to a ±5% tolerance per the datasheet's Type Number Designation note. This tolerance is maintained across the full operating temperature range of –65°C to +200°C, verified by production testing on every lot.
Can BZX85C27RL be used in surface-mount designs?
No - the BZX85C27RL is exclusively packaged in the axial-lead DO-41 (DO-204AL) through-hole glass case and lacks SMD variants. It requires manual or wave soldering with lead length ≥ 3/8″ for full 1 W power rating. For SMT equivalents, consider the MMBZ5250B (SOT-23, 27 V, 225 mW) or adjust thermal design accordingly.
What is the maximum non-repetitive surge current for BZX85C27RL?
The BZX85C27RL supports a peak non-repetitive reverse surge current of 170 A (calculated from 170 W peak power at 19 V clamping voltage, per Figure 5), delivered as a 1/120 second half-sine or square-wave pulse. Exceeding this limit risks irreversible junction damage due to localized current crowding, even if average power remains within rating.
How does temperature affect the zener voltage of BZX85C27RL?
The BZX85C27RL exhibits a positive temperature coefficient of approximately +10 mV/°C (typical) over –55°C to +150°C, as shown in Figure 2 of the datasheet. This means VZ increases ~0.27 V over a 27°C rise - a known and compensatable drift, unlike negative-coefficient Zeners below 5 V.
Is BZX85C27RL RoHS compliant and halogen-free?
Yes - BZX85C27RL is manufactured per ON Semiconductor's standard RoHS-compliant process (Pb-free, exempt per Annex III) and meets JEDEC JS709E halogen-free requirements (< 900 ppm Cl, < 900 ppm Br, < 1500 ppm total halogens). Full compliance documentation is available under ON Semi document number 100-0001-00.
BZX85C27RL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- -
- Tolerance:
- -
- Power - Max:
- -
- Impedance (Max) (Zzt):
- -
- Current - Reverse Leakage @ Vr:
- -
- Voltage - Forward (Vf) (Max) @ If:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
BZX85C27RL FAQ
1.How can I place an order for BZX85C27RL through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX85C27RL 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 BZX85C27RL reliable?
The price and inventory of BZX85C27RL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX85C27RL is usually 5 days.
3.What payment methods are accepted for BZX85C27RL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX85C27RL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX85C27RL?
BZX85C27RL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX85C27RL 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 BZX85C27RL?
For technical support, including BZX85C27RL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX85C27RL requirements.
6.How does Aetrix verify that BZX85C27RL is sourced from the original manufacturer or authorized distributors?
All BZX85C27RL 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 BZX85C27RL meets industry standards.
7.What is the process for return or replacement of BZX85C27RL?
All BZX85C27RL units undergo pre-shipment inspection (PSI). If there is an issue with BZX85C27RL, 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 BZX85C27RL part is unused and in its original packaging.
Return procedure for BZX85C27RL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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