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onsemi MMBZ5254BLT1
- Part No.:
- MMBZ5254BLT1
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBZ5254BLT1.pdf
- Description:
- DIODE ZENER 27V 225MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,069
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Product details
Overview
MMBZ5254BLT1 from onsemi is a 27 V ±5% Zener diode in SOT-23 package, rated for 225 mW power dissipation on FR-5 board, with 4.6 mA test current, 41 Ω dynamic impedance at IZT, and 0.25 μA leakage at 21 V reverse bias. It provides precision voltage regulation in space-constrained DC power rails for portable electronics and high-density PCBs.
For engineers reviewing the MMBZ5254BLT1 datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance, thermal resistance (556 °C/W), ESD rating (>16 kV HBM), cathode-anode polarity marking, and compatibility with automated SMT assembly on FR-4/FR-5 substrates.
Technical Context
This device operates as a two-terminal voltage reference diode, conducting in reverse breakdown to clamp voltage at its nominal Zener value of 27 V when biased above VR = 21 V. Its 41 Ω Zener impedance at 4.6 mA ensures stable regulation under moderate load transients.
The SOT-23 package features a defined pinout (Pin 1: Anode, Pin 2: No Connection, Pin 3: Cathode) and supports reflow soldering up to 260°C for 10 seconds. Thermal resistance of 556 °C/W (Junction-to-Ambient, FR-5 board) defines its derating behavior above 25°C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 25.65 V min / 27 V nominal / 28.35 V max @ IZT = 4.6 mA - defines regulated output voltage window under standard test conditions |
| Power Dissipation (PD) | 225 mW @ TA = 25°C on FR-5 board - maximum continuous power before thermal derating begins |
| Zener Impedance (ZZT) | 41 Ω @ IZT = 4.6 mA - low dynamic resistance enables tight voltage regulation during current variation |
| Reverse Leakage (IR) | 0.25 μA @ VR = 21 V - minimal off-state current preserves efficiency in standby or low-power modes |
| Thermal Resistance (RJA) | 556 °C/W on FR-5 board - determines junction temperature rise per milliwatt dissipated; requires layout-aware thermal design |
| ESD Rating | Class 3 (>16 kV) per Human Body Model - withstands high-voltage electrostatic discharge without parameter shift or failure |
| Operating Temperature | −65°C to +150°C - supports industrial and automotive ambient environments without derating |
Pinout & Package
SOT-23 (TO-236) surface-mount package, 2.90 mm × 1.30 mm × 1.00 mm body size, Pb-free and RoHS compliant. Cathode indicated by band; Pin 2 is internally unconnected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode | Connected to lower-potential side of regulated rail; reverse-biased during Zener operation |
| Pin 2 | No Connection | Internally isolated; must remain unconnected on PCB to avoid parasitic coupling or shorting |
| Pin 3 | Cathode | Connected to higher-potential side; polarity band identifies this terminal for correct orientation |
Key Features
| Feature | Design Value |
|---|---|
| 225 mW power rating on FR-5 board | Enables use in compact, thermally constrained layouts without forced cooling or oversized copper |
| ESD robustness >16 kV HBM | Eliminates need for external ESD protection in handheld and field-deployable devices |
| Pb-free, halogen-free, RoHS-compliant | Meets global environmental compliance requirements for consumer, industrial, and automotive end products |
| Optimized for automated SMT assembly | Standard SOT-23 footprint and marking support high-yield pick-and-place and AOI inspection |
| Wide Zener voltage range (2.4–91 V) | Allows single-package family reuse across diverse supply rail voltages without redesign |
Applications
| Portable Power Management | USB-C PD Voltage Clamp |
|---|---|
Use Scenario: Regulating auxiliary 3.3 V or 5 V rails in battery-powered IoT sensors and wearables. IC Role / Device Role / Timing Role: Zener diode acting as shunt voltage reference and overvoltage protector for LDO input or MCU supply pins. Use Value: Maintains stable 27 V clamping threshold with <0.25 μA leakage, minimizing quiescent current drain on coin-cell or Li-ion sources. |
Use Scenario: Protecting USB-C port controller ICs from transient overvoltage during hot-plug events. IC Role / Device Role / Timing Role: Fast-acting shunt clamp limiting VBUS excursions above safe thresholds during negotiation faults. Use Value: 41 Ω ZZT ensures rapid voltage collapse during surge, while 16 kV HBM rating survives repeated human-hand ESD events. |
| Industrial Sensor Signal Conditioning | Automotive Body Control Module |
Use Scenario: Providing stable reference for 24 V sensor interface circuits in factory automation PLCs. IC Role / Device Role / Timing Role: Precision Zener reference stabilizing op-amp bias points and ADC reference dividers. Use Value: ±5% VZ tolerance and −65°C to +150°C operating range ensure accuracy across wide industrial temperature spans. |
Use Scenario: Overvoltage suppression on LIN bus or 12 V accessory lines in BCM subassemblies. IC Role / Device Role / Timing Role: Transient voltage suppressor protecting microcontroller I/O and CAN transceiver power domains. Use Value: AEC-Q101 qualified variants (e.g., SZMMBZ5254BLT1G) available; same electrical specs enable drop-in qualification upgrade path. |
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 on FR-4 and 30 Ω ZZT @ 5 mA; slightly tighter 5% tolerance | Higher power handling allows use in higher-current clamping roles; optimized for FR-4 rather than FR-5 boards | Select BZX84-C27LT1G when board thermal mass supports higher dissipation or when 30 Ω ZZT improves regulation stability under dynamic loads |
| 1SMA5927BT3G | 27 V Zener in larger SMA package; 1.5 W power rating, 10 Ω ZZT @ 33 mA; TO-220 footprint incompatible with SOT-23 layout | Designed for high-energy transient suppression in power supplies, not space-constrained signal rails | Choose 1SMA5927BT3G only when system-level surge energy exceeds 225 mW capability and PCB real estate permits SMA placement |
Compared with BZX84-C27LT1G and 1SMA5927BT3G, MMBZ5254BLT1 offers optimal balance of miniaturization, ESD resilience, and thermal performance for high-density portable designs-where SOT-23 footprint, 225 mW limit, and 16 kV HBM are decisive constraints.
Availability
MMBZ5254BLT1 is available at Aetrix Electronics and suitable for portable power management, USB-C PD protection, industrial sensor interfaces, and automotive body control modules requiring stable component supply with full traceability and lifecycle continuity.
Supply support for MMBZ5254BLT1 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 specializing in energy-efficient silicon solutions for automotive, industrial, cloud, and IoT applications.
The MMBZ52xxBLT1G series was designed specifically for space-constrained voltage regulation and overvoltage protection in high-density portable and embedded systems, emphasizing SMT manufacturability and reliability under thermal and ESD stress.
FAQ
What is the exact Zener voltage tolerance of MMBZ5254BLT1?
The MMBZ5254BLT1 has a guaranteed Zener voltage range of 25.65 V (min) to 28.35 V (max) at IZT = 4.6 mA and TA = 25°C, corresponding to a ±5% tolerance around the nominal 27 V rating. This tolerance remains valid across the full −65°C to +150°C operating temperature range as specified in the onsemi datasheet Rev. 16.
Is MMBZ5254BLT1 compatible with lead-free reflow soldering processes?
Yes, MMBZ5254BLT1 is Pb-free and RoHS compliant, qualified for standard lead-free reflow profiles. The maximum case temperature is rated at 260°C for 10 seconds, aligning with IPC/JEDEC J-STD-020 moisture sensitivity level 1 requirements. No pre-baking is required for dry storage conditions.
Does MMBZ5254BLT1 have an automotive-grade variant?
Yes-the SZMMBZ5254BLT1G is the AEC-Q101 qualified automotive variant of MMBZ5254BLT1, sharing identical electrical specifications (27 V Zener, 4.6 mA IZT, 41 Ω ZZT) and SOT-23 package. It adds PPAP capability and site-specific process controls required for automotive Tier 1 supply chains.
What is the significance of Pin 2 being "No Connection" in MMBZ5254BLT1?
Pin 2 in MMBZ5254BLT1 is internally unconnected and must remain floating on the PCB. Connecting it risks unintended parasitic paths, solder bridging, or mechanical stress on the die bond wire. This three-terminal SOT-23 configuration (Anode–NC–Cathode) is standardized across the MMBZ52xxBLT1G series for consistent placement and optical inspection.
How does the 556 °C/W thermal resistance affect MMBZ5254BLT1's practical power handling?
With RJA = 556 °C/W on FR-5 board, MMBZ5254BLT1's junction temperature rises 556°C per watt dissipated. At its rated 225 mW, ΔT = 125°C above ambient-so at TA = 50°C, TJ ≈ 175°C, exceeding its 150°C max. Thus, derating to ≤125 mW is required above 25°C to stay within safe operating limits.
MMBZ5254BLT1 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)
MMBZ5254BLT1 FAQ
1.How can I place an order for MMBZ5254BLT1 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5254BLT1 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 MMBZ5254BLT1 reliable?
The price and inventory of MMBZ5254BLT1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBZ5254BLT1 is usually 5 days.
3.What payment methods are accepted for MMBZ5254BLT1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5254BLT1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5254BLT1?
MMBZ5254BLT1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5254BLT1 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 MMBZ5254BLT1?
For technical support, including MMBZ5254BLT1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5254BLT1 requirements.
6.How does Aetrix verify that MMBZ5254BLT1 is sourced from the original manufacturer or authorized distributors?
All MMBZ5254BLT1 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 MMBZ5254BLT1 meets industry standards.
7.What is the process for return or replacement of MMBZ5254BLT1?
All MMBZ5254BLT1 units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5254BLT1, 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 MMBZ5254BLT1 part is unused and in its original packaging.
Return procedure for MMBZ5254BLT1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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