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onsemi SZBZX84B27LT1G
- Part No.:
- SZBZX84B27LT1G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
SZBZX84B27LT1G.pdf
- Description:
- DIODE ZENER 27V 250MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:5,970
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Product details
Overview
SZBZX84B27LT1G from onsemi is a 27 V ±1.85% tight-tolerance Zener diode in SOT-23 package, rated for 250 mW power dissipation on FR-5 board at 25°C, with 80 Ω dynamic impedance at 2 mA test current and 0.05 μA reverse leakage at 21.4 V. It delivers precision voltage regulation in space-constrained power rail monitoring and reference circuits.
For engineers reviewing the SZBZX84B27LT1G datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance (±1.85%), low temperature coefficient (+18.9 mV/°C), ESD robustness (>16 kV HBM), and AEC-Q101 qualification for automotive-grade reliability.
Technical Context
This device operates as a two-terminal voltage reference diode with cathode-anode polarity, requiring no external bias circuitry. Its Zener breakdown is specified at 2 mA test current (IZT = 2 mA), delivering nominal 27 V with ±0.5 V tolerance (26.5–27.5 V).
Thermal performance is defined for FR-5 board mounting: 250 mW max power at 25°C, derated by 2.0 mW/°C above ambient, yielding 500°C/W junction-to-ambient thermal resistance. The SOT-23 package supports automated assembly and meets UL 94 V-0 flammability rating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage | 27 V nominal, 26.5–27.5 V range at IZT = 2 mA - enables precise 27 V rail clamping or reference generation |
| Power Rating | 250 mW on FR-5 board at 25°C - supports low-power regulation without heatsinking in compact PCB layouts |
| Zener Impedance | 80 Ω max at IZT = 2 mA - ensures stable output under moderate load transients |
| Reverse Leakage | 0.05 μA max at VR = 21.4 V - minimizes quiescent current in battery-powered sensing nodes |
| Temp Coefficient | +18.9 mV/°C at IZT = 2 mA - predictable positive drift simplifies temperature-compensated designs |
| Capacitance | 70 pF max at VR = 0 V, f = 1 MHz - suitable for DC/low-frequency regulation, not RF bypass |
| ESD Rating | Class 3 (>16 kV) per HBM - withstands handling and board-level electrostatic discharge events |
Pinout & Package
SOT-23 (TO-236) surface-mount plastic package, 2.90 × 1.30 × 1.00 mm, void-free thermosetting case with corrosion-resistant finish, cathode indicated by band. Rated for 260°C soldering (10 s).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | Connected to lower-potential node; forward-biased when VANODE > VCATHODE − 0.9 V |
| 2 | No Connection | Internally unconnected; must remain floating - no PCB trace or pad required |
| 3 | Cathode | Connected to regulated/higher-potential node; Zener conduction occurs when VCATHODE − VANODE ≥ 27 V |
Key Features
| Feature | Design Value |
|---|---|
| Tight Zener tolerance | ±1.85% (26.5–27.5 V) at 2 mA - reduces calibration overhead in precision analog front-ends |
| AEC-Q101 qualification | Automotive-grade stress testing compliance - validated for under-hood and infotainment power rails |
| Pb-free & RoHS | Lead-free terminations and packaging - meets global environmental compliance requirements |
| High ESD immunity | Class 3 HBM (>16 kV) - eliminates need for external ESD protection in portable electronics |
| Optimized SMT package | SOT-23 footprint with 1.90 mm pin pitch - compatible with standard pick-and-place and reflow processes |
Applications
| Automotive Body Control Module | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Regulating 27 V supply for microcontroller I/O protection circuitry in door module ECUs. IC Role / Device Role / Timing Role: Two-terminal shunt regulator maintaining stable 27 V reference for level-shifting and overvoltage clamp. Use Value: Tight 26.5–27.5 V tolerance prevents false triggering of downstream protection logic across temperature. |
Use Scenario: Providing stable 27 V reference for 16-bit ADC biasing in factory-floor pressure transmitters. IC Role / Device Role / Timing Role: Precision voltage reference source with +18.9 mV/°C TC enabling first-order temperature compensation. Use Value: Low 0.05 μA leakage at 21.4 V minimizes error contribution in high-impedance sensor bridge interfaces. |
| Medical Portable Diagnostic Device | Telecom Power Sequencing Circuit |
Use Scenario: Clamping auxiliary 27 V rail in handheld ultrasound probe to protect analog front-end ICs. IC Role / Device Role / Timing Role: Overvoltage protection element absorbing transient energy during hot-swap events. Use Value: 250 mW FR-5 rating allows direct placement near sensitive components without thermal isolation. |
Use Scenario: Enabling controlled power-up sequencing by holding enable signal until 27 V rail stabilizes. IC Role / Device Role / Timing Role: Voltage threshold detector using Zener conduction to trigger MOSFET gate driver. Use Value: 80 Ω dynamic impedance ensures fast turn-on response (<100 ns) during rail ramp-up. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84B27LT1G | Same electrical specs but non-automotive grade; lacks AEC-Q101 qualification and PPAP capability | Acceptable for commercial/industrial use only; not approved for automotive production | Select when automotive qualification is unnecessary and cost sensitivity is higher |
| SZBZX84C27LT1G | Standard-tolerance version (±3.7%: 25.1–28.9 V); higher 45 μA leakage at 21.4 V; same 80 Ω ZZT | Less suitable for precision references; acceptable for general-purpose clamping where tighter tolerance is not required | Choose when ±3.7% tolerance suffices and AEC-Q101 is still needed |
Compared with BZX84B27LT1G, SZBZX84B27LT1G adds automotive qualification and process control; compared with SZBZX84C27LT1G, it trades wider tolerance for improved stability in temperature-critical reference paths.
Availability
SZBZX84B27LT1G is available at Aetrix Electronics and suitable for automotive body control modules, industrial sensor signal conditioning, medical portable diagnostic devices, and telecom power sequencing circuits requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SZBZX84B27LT1G 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 power management, analog, sensors, and connectivity solutions for automotive, industrial, and cloud infrastructure markets.
SZBZX84B27LT1G belongs to the SZBZX84BxxxLT1G series of AEC-Q101-qualified Zener diodes designed specifically for automotive and high-reliability industrial voltage regulation where tight tolerance and process traceability are mandatory.
FAQ
What is the Zener voltage tolerance of SZBZX84B27LT1G at 2 mA test current?
The SZBZX84B27LT1G has a Zener voltage tolerance of ±1.85% at IZT = 2 mA, corresponding to a guaranteed range of 26.5 V to 27.5 V. This tight tolerance is specified in the BZX84BxxxL tight-tolerance series table on page 4 of the official onsemi datasheet, distinguishing it from the broader ±3.7% tolerance of the C-series variants.
Is SZBZX84B27LT1G qualified for automotive applications?
Yes, SZBZX84B27LT1G is AEC-Q101 qualified and PPAP capable, as explicitly stated in the datasheet's Features section and ordering information table. The "SZ" prefix denotes automotive and other applications requiring unique site and control change requirements, making it suitable for production automotive systems including body electronics and ADAS power domains.
What is the maximum reverse leakage current for SZBZX84B27LT1G and at what voltage is it measured?
The maximum reverse leakage current for SZBZX84B27LT1G is 0.05 μA, measured at VR = 21.4 V (80% of nominal Zener voltage). This value is confirmed in the Electrical Characteristics table for BZX84BxxxL series on page 4 of the onsemi datasheet, under the "Max Reverse Leakage Current" column for device marking T27.
Does SZBZX84B27LT1G have a no-connect pin, and how should it be handled on the PCB?
Yes, SZBZX84B27LT1G has Pin 2 designated as "No Connection" per the mechanical outline (Style 8) and electrical characteristics tables. This terminal is internally unconnected and must remain electrically floating - no PCB trace, pad, or solder mask opening is required for Pin 2, simplifying layout and reducing risk of shorts.
What is the Zener impedance of SZBZX84B27LT1G and why does it matter for regulation stability?
The SZBZX84B27LT1G has a maximum Zener impedance (ZZT) of 80 Ω at IZT = 2 mA. This parameter directly affects regulation accuracy under varying load conditions: lower impedance yields smaller output voltage deviation when current changes, making it critical for maintaining stable reference voltage in analog sensor interfaces and feedback loops.
SZBZX84B27LT1G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- SZBZX84BxxxLT1G
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 27 V
- Tolerance:
- ±2%
- Power - Max:
- 250 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:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3 (TO-236)
SZBZX84B27LT1G FAQ
1.How can I place an order for SZBZX84B27LT1G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZBZX84B27LT1G 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 SZBZX84B27LT1G reliable?
The price and inventory of SZBZX84B27LT1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZBZX84B27LT1G is usually 5 days.
3.What payment methods are accepted for SZBZX84B27LT1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZBZX84B27LT1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZBZX84B27LT1G?
SZBZX84B27LT1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZBZX84B27LT1G 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 SZBZX84B27LT1G?
For technical support, including SZBZX84B27LT1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZBZX84B27LT1G requirements.
6.How does Aetrix verify that SZBZX84B27LT1G is sourced from the original manufacturer or authorized distributors?
All SZBZX84B27LT1G 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 SZBZX84B27LT1G meets industry standards.
7.What is the process for return or replacement of SZBZX84B27LT1G?
All SZBZX84B27LT1G units undergo pre-shipment inspection (PSI). If there is an issue with SZBZX84B27LT1G, 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 SZBZX84B27LT1G part is unused and in its original packaging.
Return procedure for SZBZX84B27LT1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SZBZX84B27LT1G Tags
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