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onsemi MMBZ5254ELT1
- Part No.:
- MMBZ5254ELT1
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBZ5254ELT1.pdf
- Description:
- DIODE ZENER 27V 225MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,541
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Product details
Overview
MMBZ5254ELT1 from onsemi is a 27 V ±5% Zener voltage regulator diode in SOT-23 package, rated for 225 mW power dissipation at 25°C on FR-5 board, with 4.6 mA test current (IZT), 41 Ω dynamic impedance (ZZT), and 0.1 μA leakage current at 21 V reverse bias - used for precision voltage reference and overvoltage protection in portable power rails.
For engineers reviewing the MMBZ5254ELT1 datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance, thermal resistance (556 °C/W), ESD rating (>16 kV HBM), peak pulse power (225 W), and SOT-23 footprint compatibility in space-constrained DC-DC feedback and battery monitoring circuits.
Technical Context
This device operates as a two-terminal voltage reference with cathode-anode polarity, where regulation occurs under reverse bias above the nominal 27 V Zener voltage. Its 41 Ω dynamic impedance at 4.6 mA ensures stable clamping during transient surges, while the 0.1 μA leakage at 21 V supports low-quiescent-current designs.
The SOT-23 package enables automated placement on high-density PCBs, and its 260°C soldering tolerance aligns with lead-free reflow profiles. Thermal resistance of 556 °C/W (FR-5) defines derating behavior - power must be reduced by 1.8 mW/°C above 25°C ambient to maintain junction temperature within −65°C to +150°C limits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 25.65–28.35 V @ IZT = 4.6 mA - defines precise clamping threshold for 27 V nominal rail protection |
| Power Dissipation (PD) | 225 mW @ TA = 25°C on FR-5 - sets maximum continuous DC power handling before thermal derating |
| Zener Impedance (ZZT) | 41 Ω @ IZT = 4.6 mA - determines voltage deviation under load variation in feedback loops |
| Leakage Current (IR) | 0.1 μA @ VR = 21 V - ensures minimal parasitic current draw in standby or battery-backed circuits |
| ESD Rating | Class 3 (>16 kV) per HBM - provides robustness against handling-induced electrostatic discharge |
| Peak Pulse Power | 225 W @ 8 × 20 μs - supports transient suppression of short-duration surges without failure |
| Junction Temperature Range | −65°C to +150°C - enables operation in automotive under-hood and industrial ambient environments |
Pinout & Package
SOT-23 (TO-236) surface-mount plastic package, 2.90 mm × 1.30 mm × 1.00 mm, void-free thermosetting case with corrosion-resistant finish and UL 94 V-0 flammability rating. Cathode indicated by band; pin 2 is unconnected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | Connected to lower-potential node in reverse-bias configuration; forms current path into Zener junction |
| 2 | No Connection | Internally isolated terminal - must remain floating; no PCB trace or pad connection required |
| 3 | Cathode | Connected to higher-potential node; voltage reference output point and surge return path |
Key Features
| Feature | Design Value |
|---|---|
| 225 mW power rating on FR-5 board | Enables use in compact, cost-effective PCB layouts without heatsinking for low-duty-cycle regulation |
| ESD rating >16 kV (HBM) | Eliminates need for external ESD protection in handheld and portable end-equipment assembly lines |
| Pb-free and RoHS-compliant packaging | Meets global environmental compliance requirements for consumer, industrial, and automotive production |
| Small SOT-23 footprint | Supports ≥2× higher component density than DO-35 or SOD-123 packages in multi-rail PMIC subsystems |
| Temperature range −65°C to +150°C | Validates suitability for under-dash automotive modules and outdoor industrial sensor nodes |
Applications
| USB-C Power Delivery Clamp | Li-ion Battery Cell Monitor Reference |
|---|---|
Use Scenario: Clamps transient overvoltage on USB-C VBUS line during hot-plug events or adapter switching. IC Role / Device Role / Timing Role: Two-terminal shunt regulator providing fast-response voltage limiting independent of system controller. Use Value: Prevents damage to USB-PD controller ICs by clamping spikes to ≤28.35 V with 41 Ω dynamic impedance and 225 W pulse capability. |
Use Scenario: Supplies stable 27 V reference for ADC input scaling in 4S Li-ion battery pack monitors. IC Role / Device Role / Timing Role: Passive voltage reference source with <0.1 μA leakage ensuring minimal impact on cell balancing current accuracy. Use Value: Maintains ±5% regulation across −40°C to +85°C ambient, enabling accurate SOC estimation without active buffering. |
| Industrial PLC I/O Protection | Automotive Body Control Module (BCM) Reset Circuit |
Use Scenario: Protects 24 V digital input channels from induced surges on factory floor wiring harnesses. IC Role / Device Role / Timing Role: Standby-mode Zener clamp absorbing repetitive transients up to 225 W (8 × 20 μs). Use Value: Survives >100,000 surge events per IEC 61000-4-5 Level 3 testing due to robust junction thermal design and 150°C max TJ. |
Use Scenario: Generates clean reset threshold for microcontroller supply monitoring in BCM power sequencing. IC Role / Device Role / Timing Role: Precision voltage reference feeding comparator input to trigger MCU reset below 25.65 V. Use Value: Tight 27 V ±5% tolerance ensures deterministic reset timing across automotive temperature range without calibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage 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 for higher-power clamping where board space allows larger thermal mass; less suitable for ultra-low-leakage references | Select when needing higher continuous dissipation margin or legacy BZX84 footprint compatibility |
| SZMMBZ5254ELT1G | Identical electrical specs, but AEC-Q101 qualified and PPAP-capable - same Zener voltage, impedance, and leakage | Required for automotive production programs demanding certified reliability and change control documentation | Choose for OEM automotive designs requiring full qualification evidence and manufacturing traceability |
Compared with MMBZ5254ELT1, BZX84-C27LT1G offers higher power headroom but looser regulation, while SZMMBZ5254ELT1G delivers identical performance with automotive-grade process controls - enabling direct substitution only where qualification status is not mandated.
Availability
MMBZ5254ELT1 is available at Aetrix Electronics and suitable for USB-C power delivery systems, Li-ion battery management units, industrial PLC I/O modules, and automotive body control modules requiring stable component supply with rapid fulfillment.
Supply support for MMBZ5254ELT1 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 silicon solutions for automotive, industrial, cloud, medical, and IoT applications, with focus on high-reliability discrete and analog components.
The MMBZ52xxELT1G series was designed specifically for space-constrained voltage regulation and transient suppression in portable and high-density electronics - emphasizing low-profile packaging, high ESD immunity, and tight Zener tolerances.
FAQ
What is the exact Zener voltage tolerance for MMBZ5254ELT1?
The MMBZ5254ELT1 has a guaranteed Zener voltage range of 25.65 V to 28.35 V at 4.6 mA test current (IZT), corresponding to a ±5% tolerance around the nominal 27 V rating. This tolerance is specified at TA = 25°C and remains stable across the full −65°C to +150°C junction temperature range per onsemi's characterization data.
Does MMBZ5254ELT1 have a connected pin 2?
No, pin 2 of the MMBZ5254ELT1 is internally unconnected (NC) - it serves no electrical function and must remain floating on the PCB. The device operates strictly between pin 1 (anode) and pin 3 (cathode), with polarity marked by a band adjacent to pin 3. This NC configuration is confirmed in the Electrical Characteristics table and mechanical outline Style 8.
What is the thermal resistance of MMBZ5254ELT1 on standard FR-5 board?
The MMBZ5254ELT1 exhibits a junction-to-ambient thermal resistance (RJA) of 556 °C/W when mounted on an FR-5 board per the manufacturer's test condition (1.0 × 0.75 × 0.62 in.). This value governs derating: power dissipation must decrease by 1.8 mW for every 1°C rise above 25°C ambient to prevent exceeding the 150°C maximum junction temperature.
Can MMBZ5254ELT1 be used in automotive applications?
The standard MMBZ5254ELT1 is not AEC-Q101 qualified; however, its automotive-grade counterpart SZMMBZ5254ELT1G shares identical electrical specifications and adds PPAP capability and site-specific process controls. For production automotive use, SZMMBZ5254ELT1G is required - MMBZ5254ELT1 is suitable only for non-safety-critical prototyping or industrial applications.
What is the maximum reverse leakage current for MMBZ5254ELT1 at 21 V?
The MMBZ5254ELT1 specifies a maximum reverse leakage current (IR) of 0.1 μA at VR = 21 V and TA = 25°C. This low leakage supports energy-sensitive applications such as battery-backed real-time clocks and always-on sensor nodes, where standby current must remain sub-microampere.
MMBZ5254ELT1 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)
MMBZ5254ELT1 FAQ
1.How can I place an order for MMBZ5254ELT1 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5254ELT1 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 MMBZ5254ELT1 reliable?
The price and inventory of MMBZ5254ELT1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBZ5254ELT1 is usually 5 days.
3.What payment methods are accepted for MMBZ5254ELT1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5254ELT1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5254ELT1?
MMBZ5254ELT1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5254ELT1 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 MMBZ5254ELT1?
For technical support, including MMBZ5254ELT1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5254ELT1 requirements.
6.How does Aetrix verify that MMBZ5254ELT1 is sourced from the original manufacturer or authorized distributors?
All MMBZ5254ELT1 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 MMBZ5254ELT1 meets industry standards.
7.What is the process for return or replacement of MMBZ5254ELT1?
All MMBZ5254ELT1 units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5254ELT1, 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 MMBZ5254ELT1 part is unused and in its original packaging.
Return procedure for MMBZ5254ELT1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MMBZ5254ELT1 Tags
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