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onsemi BZX84C27ET1
- Part No.:
- BZX84C27ET1
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX84C27ET1.pdf
- Description:
- DIODE ZENER 27V 225MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:7,235
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Product details
Overview
BZX84C27ET1 from onsemi is a 27 V, 225 mW surface-mount Zener diode in SOT-23 package, rated for 5 mA test current (VZ = 25.1–28.9 V), with 80 Ω dynamic impedance at 5 mA and 0.05 µA reverse leakage at 20.3 V. It provides precision voltage regulation in space-constrained portable power rails and reference circuits.
For engineers reviewing the BZX84C27ET1 datasheet, pinout, applications, or equivalent options, key selection criteria include its 27 V nominal Zener voltage, ±5% tolerance at 5 mA, thermal coefficient of +21.4 mV/°C, Pb-free SOT-23 package, and suitability for low-power voltage clamping and analog reference stabilization.
Technical Context
The BZX84C27ET1 operates as a two-terminal voltage reference device, conducting in reverse breakdown to maintain stable voltage across its cathode-anode terminals. Its Zener mechanism delivers predictable regulation under DC or low-frequency transient conditions, with junction temperature range from −65°C to +150°C.
It exhibits a positive temperature coefficient (+21.4 mV/°C) above ~5 V, enabling predictable drift compensation in bias networks. The device features Class 3 ESD robustness (>16 kV HBM), 225 W peak pulse power handling (8 × 20 µs), and 70 pF capacitance at 0 V bias - critical for noise-sensitive analog sensing paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 27 V @ IZT = 5 mA - defines primary regulation point for stable 27 V reference generation |
| Zener Voltage Range | 25.1 V to 28.9 V @ 5 mA - specifies absolute min/max output under production tolerance and test condition |
| Zener Impedance | 80 Ω @ 5 mA - determines regulation stiffness; lower values yield tighter voltage hold under load variation |
| Power Dissipation | 225 mW on FR-5 board @ 25°C - sets maximum continuous DC power before thermal derating begins |
| Reverse Leakage | 0.05 µA @ VR = 20.3 V - ensures minimal quiescent current draw in high-impedance bias networks |
| Temperature Coefficient | +21.4 mV/°C @ 5 mA - quantifies voltage drift per degree; enables thermal error budgeting in precision circuits |
| Junction-to-Ambient RθJA | 556 °C/W on FR-5 - defines thermal resistance path; used to calculate junction temperature rise under load |
Pinout & Package
SOT-23 (Case 318, Style 8) surface-mount plastic package with void-free thermosetting epoxy, corrosion-resistant finish, and UL 94 V-0 flammability rating. Cathode indicated by polarity band. Maximum soldering temperature: 260°C for 10 seconds.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Anode) | Forward conduction terminal / Zener cathode reference node | Connected to lower-potential side of regulated circuit; forms return path during reverse breakdown |
| 2 (No Connection) | Internal isolation / non-bonded lead | Electrically floating; must not be soldered or routed; no PCB trace or copper pour required |
| 3 (Cathode) | Zener breakdown terminal / regulation output node | Connected to higher-potential side; delivers stabilized 27 V when reverse-biased above VZ |
Key Features
| Feature | Design Value |
|---|---|
| 225 mW power rating on FR-5 board | Enables use in compact, low-power consumer electronics without heatsinking or airflow |
| ESD rating >16 kV (HBM Class 3) | Supports direct handling and assembly in unshielded environments without additional protection circuitry |
| Pb-free (RoHS-compliant) packaging | Meets global environmental compliance requirements for industrial and automotive end equipment |
| Small SOT-23 footprint (2.9 × 1.3 × 1.0 mm) | Reduces PCB area by >60% vs. DO-35; supports high-density layout in smartphones and wearables |
| Peak pulse power: 225 W (8 × 20 µs) | Withstands ESD transients and short-duration surges without degradation or parametric shift |
Applications
| Portable Power Rail Clamping | Analog Sensor Reference |
|---|---|
Use Scenario: Clamp supply rail spikes in battery-powered Bluetooth earbuds during RF transmit bursts. IC Role / Device Role / Timing Role: Zener clamp protecting LDO input from 30 V transient overshoot. Use Value: Prevents LDO damage while maintaining <1 µA quiescent current draw during normal operation. |
Use Scenario: Provide stable 27 V reference for 16-bit ADC bias in handheld multimeter front-end. IC Role / Device Role / Timing Role: Precision voltage reference source for analog signal conditioning chain. Use Value: Enables ±0.1% full-scale accuracy over −20°C to +70°C due to known +21.4 mV/°C TC. |
| USB-C Overvoltage Protection | Industrial PLC Input Conditioning |
Use Scenario: Limit USB-C VBUS line to safe level during hot-plug events in portable docking station. IC Role / Device Role / Timing Role: Fast-acting shunt regulator absorbing surge energy before downstream protection IC triggers. Use Value: Responds within nanoseconds to 20 V transients, limiting clamped voltage to ≤28.9 V with 80 Ω dynamic impedance. |
Use Scenario: Stabilize 24 V DC input to isolated digital input module in factory automation controller. IC Role / Device Role / Timing Role: Pre-regulator establishing clean 27 V local bias for optocoupler LED drive. Use Value: Reduces input ripple by >40 dB at 1 kHz, improving noise immunity of 24 V logic-level detection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBZ5257BLT1 | 27 V nominal, 200 mW rating, 100 Ω ZZT @ 20 mA, SOT-23 package | Higher Zener impedance and lower power rating reduce regulation accuracy under varying loads | Acceptable where cost sensitivity outweighs regulation tightness; verify thermal margin at 225 mW operating point |
| BZX84-C27LT1G | Identical electrical specs, same SOT-23 package, but marked "LT1G" and shipped in 10,000/reel tape-and-reel | No functional difference; differs only in packaging format and date-code marking convention | Select for high-volume automated assembly requiring larger reel quantities; identical performance and qualification |
Compared with MMBZ5257BLT1, the BZX84C27ET1 offers tighter Zener impedance (80 Ω vs. 100 Ω) and higher power headroom (225 mW vs. 200 mW), improving regulation stability in variable-load applications; versus BZX84-C27LT1G, it shares identical electrical behavior but uses different tape-and-reel configuration (3,000/reel) and marking code (BC9).
Availability
BZX84C27ET1 is available at Aetrix Electronics and suitable for portable power rail clamping, analog sensor reference, and industrial PLC input conditioning requiring stable component supply, consistent RoHS compliance, and SOT-23 footprint compatibility.
Supply support for BZX84C27ET1 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 specializing in energy-efficient silicon solutions for automotive, industrial, cloud, and IoT applications.
The BZX84C27ET1 belongs to the BZX84CxxxET1 series of 225 mW Zener regulators designed specifically for space-constrained, low-power voltage reference and clamping in portable and high-density electronics.
FAQ
What is the Zener voltage tolerance of BZX84C27ET1 at 5 mA?
The BZX84C27ET1 has a Zener voltage range of 25.1 V to 28.9 V at IZT = 5 mA, corresponding to a ±7% tolerance around the nominal 27 V rating. This tolerance reflects production spread under standard test conditions and must be accounted for in reference voltage design margins.
Can BZX84C27ET1 be used in place of a 24 V Zener diode?
No - the BZX84C27ET1 is specified for 27 V regulation and is not interchangeable with 24 V Zeners like BZX84C24ET1. Substituting it would raise the regulated voltage by ~3 V, potentially exceeding downstream component ratings. Always match nominal Zener voltage to circuit requirements.
What is the maximum reverse leakage current for BZX84C27ET1?
The maximum reverse leakage current for BZX84C27ET1 is 0.05 µA at VR = 20.3 V (85% of nominal VZ). This ultra-low leakage supports high-impedance bias networks and minimizes standby power loss in battery-critical designs.
Does BZX84C27ET1 have a built-in capacitor or ESD protection structure?
The BZX84C27ET1 incorporates intrinsic junction capacitance (70 pF at 0 V bias) and meets Class 3 HBM ESD rating (>16 kV), but it contains no discrete integrated capacitor or external ESD protection elements. Its ESD robustness arises from process-level junction design, not added structures.
Is pin 2 of BZX84C27ET1 electrically connected internally?
No - pin 2 of the BZX84C27ET1 is a no-connect terminal with no internal bond wire or die connection. It must remain unconnected on the PCB; routing traces or applying solder to pin 2 may cause mechanical stress or unintended shorts.
BZX84C27ET1 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:
- 225 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:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3 (TO-236)
BZX84C27ET1 FAQ
1.How can I place an order for BZX84C27ET1 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84C27ET1 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 BZX84C27ET1 reliable?
The price and inventory of BZX84C27ET1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84C27ET1 is usually 5 days.
3.What payment methods are accepted for BZX84C27ET1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84C27ET1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84C27ET1?
BZX84C27ET1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84C27ET1 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 BZX84C27ET1?
For technical support, including BZX84C27ET1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84C27ET1 requirements.
6.How does Aetrix verify that BZX84C27ET1 is sourced from the original manufacturer or authorized distributors?
All BZX84C27ET1 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 BZX84C27ET1 meets industry standards.
7.What is the process for return or replacement of BZX84C27ET1?
All BZX84C27ET1 units undergo pre-shipment inspection (PSI). If there is an issue with BZX84C27ET1, 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 BZX84C27ET1 part is unused and in its original packaging.
Return procedure for BZX84C27ET1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84C27ET1 Tags
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