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onsemi MMBZ5254ELT1G
- Part No.:
- MMBZ5254ELT1G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBZ5254ELT1G.pdf
- Description:
- DIODE ZENER 27V 225MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,005
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Product details
Overview
MMBZ5254ELT1G from onsemi is a 27 V ±5% Zener diode in SOT-23 package, rated for 225 mW power dissipation at 25°C, with 4.6 mA test current (IZT), 41 Ω dynamic impedance (ZZT), and 0.1 μA leakage at 21 V reverse bias - used for precision voltage reference and overvoltage protection in portable power rails.
For engineers reviewing the MMBZ5254ELT1G datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance, thermal resistance (556 °C/W on FR-5), ESD robustness (>16 kV HBM), peak pulse power (225 W), and Pb-free SOT-23 compatibility with automated assembly.
Technical Context
This device operates as a two-terminal voltage regulator in reverse-biased mode, with nominal Zener voltage of 27 V measured at IZT = 4.6 mA under 25°C ambient conditions. Its temperature coefficient is +11 mV/°C (typical for 27 V devices), and it exhibits low dynamic impedance (41 Ω) ensuring stable regulation under varying load currents.
The SOT-23 package features a defined pinout (Pin 1: Anode, Pin 2: No Connection, Pin 3: Cathode), polarity band marking, and UL 94 V-0 flammability rating. It supports reflow soldering up to 260°C for 10 seconds and delivers Class 3 ESD immunity per Human Body Model.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 25.65–28.35 V @ IZT = 4.6 mA - defines regulated output voltage range for reference or clamping circuits |
| Power Dissipation (PD) | 225 mW @ TA = 25°C on FR-5 board - sets maximum continuous DC power handling before thermal derating |
| Zener Impedance (ZZT) | 41 Ω @ IZT = 4.6 mA - determines regulation accuracy under small-signal AC load variations |
| Leakage Current (IR) | 0.1 μA @ VR = 21 V - ensures minimal standby current draw in high-impedance bias networks |
| ESD Rating | Class 3 (>16 kV HBM) - enables robust handling in manual assembly and field-replaceable modules |
| Thermal Resistance (RJA) | 556 °C/W on FR-5 board - informs junction temperature rise under given power and PCB layout |
| Peak Pulse Power | 225 W @ 8 × 20 μs waveform - supports transient surge suppression without failure |
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 and cathode polarity band marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode | Connected to lower-potential node in reverse-bias configuration; required for proper Zener conduction path |
| Pin 2 | No Connection | Internally unconnected; must remain floating - no PCB trace or pad should tie to this terminal |
| Pin 3 | Cathode | Connected to higher-potential node; polarity band on package identifies this terminal for orientation verification |
Key Features
| Feature | Design Value |
|---|---|
| 225 mW power rating on FR-5 board | Enables compact voltage regulation in space-constrained portable designs without forced cooling |
| Pb-free SOT-23 package | Complies with RoHS and JEDEC J-STD-020 reflow profiles for lead-free manufacturing |
| ESD rating >16 kV (HBM) | Eliminates need for external ESD protection in handheld and consumer interface circuits |
| Optimized for automated board assembly | Standardized footprint and marking support high-yield pick-and-place and AOI inspection |
| UL 94 V-0 flammability rating | Meets safety requirements for end equipment in consumer and industrial applications |
Applications
| Portable Power Rail Clamping | Low-Power Reference Generator |
|---|---|
|
Use Scenario: Protecting 3.3 V or 5 V logic supply lines from ESD and transient overvoltage in smartphones and wearables. IC Role / Device Role / Timing Role: Zener diode operating in reverse breakdown to clamp voltage spikes above 27 V while sinking transient current. Use Value: Prevents damage to downstream ICs by limiting rail excursion to ≤28.35 V during 8×20 μs surges up to 225 W peak. |
Use Scenario: Generating a stable 27 V reference for ADC biasing or comparator thresholds in battery-powered sensors. IC Role / Device Role / Timing Role: Two-terminal passive voltage reference providing fixed potential independent of load current within specified IZT range. Use Value: Delivers ±5% voltage accuracy with 41 Ω dynamic impedance, minimizing drift across 0–10 mA load variation. |
| Automotive Subsystem Protection | Industrial Signal Conditioning |
|
Use Scenario: Safeguarding LIN bus transceivers and microcontroller I/O pins against load-dump-induced transients in 12 V vehicle subsystems. IC Role / Device Role / Timing Role: Overvoltage clamp placed between signal line and ground, triggered when voltage exceeds 27 V threshold. Use Value: Withstands 225 W peak pulses and maintains <0.1 μA leakage below 21 V, preserving signal integrity during normal operation. |
Use Scenario: Stabilizing excitation voltage for RTD or strain gauge bridges in programmable logic controller (PLC) analog input modules. IC Role / Device Role / Timing Role: Precision shunt reference establishing known bias point for ratiometric measurement circuits. Use Value: Temperature coefficient of +11 mV/°C enables predictable drift compensation in 0–70°C industrial environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C27LT1G | Same 27 V nominal Zener, but 300 mW rating and 60 Ω ZZT @ 5 mA - higher power, higher impedance | Preferred where higher continuous dissipation is needed; less suitable for low-noise reference use | Select BZX84-C27LT1G if board layout allows larger thermal relief or if 300 mW headroom is required |
| MMBZ5254BS | Same electrical specs but in SOD-123 package - larger footprint, higher thermal mass, no NC pin | Better suited for manual prototyping or high-reliability industrial boards requiring mechanical robustness | Choose MMBZ5254BS when SOT-23 assembly constraints or NC-pin routing complexity are concerns |
Compared with MMBZ5254ELT1G, BZX84-C27LT1G offers greater power margin but reduced regulation precision, while MMBZ5254BS trades miniaturization for thermal and mechanical resilience - selection depends on PCB density, thermal budget, and assembly method.
Availability
MMBZ5254ELT1G is available at Aetrix Electronics and suitable for portable electronics, automotive body control modules, and industrial sensor interfaces requiring stable component supply and RoHS-compliant sourcing.
Supply support for MMBZ5254ELT1G 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 is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The MMBZ52xxELT1G series targets high-density, low-power voltage regulation in portable and space-constrained systems - designed specifically for SMT reliability, ESD-hardened operation, and consistent Zener performance across temperature.
FAQ
What is the Zener voltage tolerance of MMBZ5254ELT1G?
The MMBZ5254ELT1G has a Zener voltage range of 25.65 V to 28.35 V at IZT = 4.6 mA and TA = 25°C, corresponding to ±5% tolerance around the nominal 27 V rating. This tolerance remains valid across its operating junction temperature range of −65°C to +150°C, with voltage shift governed by its +11 mV/°C temperature coefficient.
Can MMBZ5254ELT1G be used in place of a 24 V Zener diode?
No - MMBZ5254ELT1G is specifically a 27 V Zener diode and is not interchangeable with 24 V variants like MMBZ5248ELT1G (18 V) or MMBZ5250ELT1G (20 V). Substituting it for a 24 V part would result in incorrect clamping or reference voltage, potentially causing system malfunction. Always match nominal Zener voltage and tolerance to circuit requirements.
What does the "NC" pin (Pin 2) mean for MMBZ5254ELT1G?
Pin 2 of the MMBZ5254ELT1G is internally not connected (NC) and must remain unconnected on the PCB. It serves no electrical function and is a structural artifact of the SOT-23 mold design. Routing traces or placing vias to Pin 2 may cause assembly defects or short-circuit risks - layout guidelines require leaving this pad floating.
Is MMBZ5254ELT1G qualified for automotive applications?
The standard MMBZ5254ELT1G is not AEC-Q101 qualified; however, the SZMMBZ5254ELT1G variant - identical electrically but with automotive-specific process controls and PPAP documentation - is fully AEC-Q101 qualified. For automotive use, specify the SZ-prefix version to ensure compliance with automotive reliability and traceability requirements.
How does the 225 mW power rating apply in real-world PCB layouts?
The 225 mW rating for MMBZ5254ELT1G applies strictly to FR-5 board construction with defined dimensions (1.0 × 0.75 × 0.62 in.) and zero copper area beyond the pad. In typical 2-layer PCBs with limited copper pour, actual safe continuous dissipation drops to ~120–150 mW. Derating by 1.8 mW/°C above 25°C is mandatory to avoid exceeding the 150°C max junction temperature.
MMBZ5254ELT1G 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:
- ±5%
- Power - Max:
- 225 mW
- Impedance (Max) (Zzt):
- 41 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 21 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 (TO-236)
MMBZ5254ELT1G FAQ
1.How can I place an order for MMBZ5254ELT1G through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5254ELT1G 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 MMBZ5254ELT1G reliable?
The price and inventory of MMBZ5254ELT1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBZ5254ELT1G is usually 5 days.
3.What payment methods are accepted for MMBZ5254ELT1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5254ELT1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5254ELT1G?
MMBZ5254ELT1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5254ELT1G 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 MMBZ5254ELT1G?
For technical support, including MMBZ5254ELT1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5254ELT1G requirements.
6.How does Aetrix verify that MMBZ5254ELT1G is sourced from the original manufacturer or authorized distributors?
All MMBZ5254ELT1G 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 MMBZ5254ELT1G meets industry standards.
7.What is the process for return or replacement of MMBZ5254ELT1G?
All MMBZ5254ELT1G units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5254ELT1G, 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 MMBZ5254ELT1G part is unused and in its original packaging.
Return procedure for MMBZ5254ELT1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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