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onsemi MMBZ5253BLT1
- Part No.:
- MMBZ5253BLT1
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBZ5253BLT1.pdf
- Description:
- DIODE ZENER 25V 225MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,452
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Product details
Overview
MMBZ5253BLT1 from onsemi is a 25 V ±4% Zener diode in SOT-23 package, rated for 225 mW power dissipation on FR-5 board at 25°C, with 35 Ω dynamic impedance at 5 mA test current and 0.1 μA reverse leakage at 19 V, used for precision voltage regulation in space-constrained portable electronics.
For engineers reviewing the MMBZ5253BLT1 datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, thermal behavior, ESD robustness (Class 3, >16 kV HBM), and real-world use cases in battery-powered systems requiring stable reference voltages under varying load and temperature conditions.
Technical Context
This Zener diode operates in reverse breakdown to maintain a stable 25 V reference across its cathode-anode terminals, with a nominal temperature coefficient of +5.5 mV/°C above 6 V, enabling predictable drift compensation in analog circuits. Its 225 mW rating is defined at 25°C ambient and derates linearly at 1.8 mW/°C above that point.
The device features a no-connect (NC) terminal (Pin 2), isolating internal structure from external circuitry, and exhibits low capacitance (≈15 pF at 50% VZ) suitable for high-frequency noise suppression. Reverse leakage remains ≤0.1 μA up to 19 V, ensuring minimal standby current draw in always-on subsystems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 23.75–26.25 V @ IZT = 5 mA - defines tight regulation window for 25 V reference designs |
| Power Dissipation (PD) | 225 mW on FR-5 board @ 25°C - sets maximum continuous power handling in standard PCB layouts |
| Zener Impedance (ZZT) | ≤35 Ω @ IZT = 5 mA - ensures low AC impedance for stable regulation under dynamic load changes |
| Reverse Leakage (IR) | ≤0.1 μA @ VR = 19 V - guarantees negligible quiescent current in low-power sleep modes |
| ESD Rating | Class 3 (>16 kV HBM) - provides robust protection against handling-induced electrostatic discharge |
| Junction Temp Range | −65°C to +150°C - supports operation in automotive under-hood and industrial environments |
| Forward Voltage (VF) | ≤0.95 V @ IF = 10 mA - enables use as low-drop clamp or polarity indicator in forward bias |
Pinout & Package
SOT-23 (TO-236) surface-mount plastic package, 2.90 × 1.30 × 1.00 mm body size, void-free thermosetting case with corrosion-resistant finish, UL 94 V-0 flammability rating, and cathode indicated by polarity band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | Connected to lower-potential node in reverse-bias regulation; carries full Zener current during conduction |
| 2 | No Connection | Internally isolated; must remain unconnected in PCB layout to avoid parasitic coupling or mechanical stress |
| 3 | Cathode | Connected to regulated output node; serves as voltage reference point and primary heat path to PCB copper |
Key Features
| Feature | Design Value |
|---|---|
| Pb-Free, Halogen-Free/BFR-Free | RoHS-compliant construction meets global environmental compliance requirements without performance trade-offs |
| Small SOT-23 footprint | Enables placement in high-density layouts such as smartphone PMIC rails and wearable sensor modules |
| 225 mW FR-5 rating | Supports reliable regulation in consumer-grade PCBs without forced air or heatsinking |
| Class 3 ESD robustness | Eliminates need for external ESD protection in handheld device front-end circuits |
| Stable 25 V reference | Provides accurate voltage clamping for ADC references, LDO feedback networks, and overvoltage protection thresholds |
Applications
| Battery Voltage Monitor | USB-C Power Delivery Clamp |
|---|---|
|
Use Scenario: Monitoring Li-ion cell voltage in portable medical devices to trigger low-battery alerts before shutdown. IC Role / Device Role / Timing Role: Zener reference in comparator input network, providing fixed 25 V threshold against scaled battery voltage. Use Value: Tight 25 V tolerance (±4%) ensures consistent trip point across temperature and unit-to-unit variation, reducing calibration overhead. |
Use Scenario: Clamping transient surges on USB-C VBUS line during hot-plug events in docking stations. IC Role / Device Role / Timing Role: Fast-acting shunt regulator absorbing energy spikes exceeding 25 V, protecting downstream PD controller ICs. Use Value: Low 35 Ω ZZT minimizes voltage overshoot during 100 ns transients, preserving signal integrity on 20 V PD rails. |
| Industrial Sensor Signal Conditioning | Automotive Body Control Module (BCM) |
|
Use Scenario: Stabilizing excitation voltage for 4–20 mA current-loop pressure sensors in factory automation PLCs. IC Role / Device Role / Timing Role: Precision voltage reference for op-amp-based current source, maintaining loop accuracy over −40°C to +85°C. Use Value: Predictable +5.5 mV/°C TC allows software compensation in firmware, eliminating need for external temp sensors. |
Use Scenario: Overvoltage protection for microcontroller I/O pins connected to 12 V vehicle bus in BCM door module. IC Role / Device Role / Timing Role: Standby-mode clamp limiting pin voltage to 25 V during load-dump events (ISO 7637-2 Pulse 5a). Use Value: 0.1 μA leakage at 19 V prevents false wake-up in sleep mode while surviving 120 V transients per AEC-Q101 stress profiles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBZ5253BLT1G | Pb-free version with identical electrical specs and SOT-23 package; differs only in RoHS compliance marking ("G" suffix) | Required for new designs targeting EU/China RoHS compliance; functionally interchangeable in legacy boards | Select MMBZ5253BLT1G for production builds requiring halogen-free certification; MMBZ5253BLT1 remains valid for non-RoHS legacy repair |
| BZX84-C24LT1G | 24 V nominal Zener (22.8–25.2 V), 300 mW rating, same SOT-23 package but higher power and wider tolerance (±5%) | Better suited for higher-power clamping where 24 V vs. 25 V is acceptable; less precise for reference use | Choose BZX84-C24LT1G when marginally lower voltage and higher surge capability outweigh 1 V reference accuracy loss |
Compared with MMBZ5253BLT1, MMBZ5253BLT1G offers identical regulation performance with mandatory Pb-free compliance, while BZX84-C24LT1G trades 1 V lower nominal voltage and ±5% tolerance for 33% higher power headroom-making it viable for ruggedized clamping but unsuitable for precision 25 V references.
Availability
MMBZ5253BLT1 is available at Aetrix Electronics and suitable for battery management systems, USB-C power delivery interfaces, industrial sensor signal chains, and automotive body control modules requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for MMBZ5253BLT1 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 MMBZ52xxBLT1G series was designed specifically for compact, high-reliability voltage regulation in portable and space-constrained electronics, emphasizing low leakage, high ESD immunity, and stable thermal performance.
FAQ
What is the exact Zener voltage range for MMBZ5253BLT1 at 5 mA test current?
The MMBZ5253BLT1 has a guaranteed Zener voltage range of 23.75 V to 26.25 V when tested at IZT = 5 mA and TA = 25°C. This ±4% tolerance reflects the device's nominal 25 V rating and is validated per onsemi's Electrical Characteristics table on page 3 of the official datasheet. The MMBZ5253BLT1 maintains this specification across its qualified operating temperature range.
Does MMBZ5253BLT1 have a functional third pin, and what happens if Pin 2 is connected?
No, Pin 2 of the MMBZ5253BLT1 is explicitly designated as "No Connection" in the datasheet's marking diagram and mechanical outline (Style 8). It is internally isolated and must remain unconnected on the PCB. Soldering or routing to Pin 2 may introduce mechanical stress, parasitic capacitance, or unintended current paths that degrade regulation stability or cause premature failure. The MMBZ5253BLT1 relies solely on Pins 1 (Anode) and 3 (Cathode) for operation.
How does the thermal derating of MMBZ5253BLT1 work above 25°C ambient temperature?
The MMBZ5253BLT1 derates linearly at 1.8 mW/°C above 25°C ambient when mounted on FR-5 board, meaning its usable power drops to 223.2 mW at 26°C and 207 mW at 35°C. This derating is based on a junction-to-ambient thermal resistance (RJA) of 556°C/W. Engineers must apply this curve in thermal design-especially in sealed enclosures-to ensure junction temperature stays within the −65°C to +150°C limit. The MMBZ5253BLT1's thermal behavior is fully documented in the Maximum Ratings table on page 1 of the datasheet.
Is MMBZ5253BLT1 suitable for automotive applications, and what qualifications does it hold?
The MMBZ5253BLT1 itself is not AEC-Q101 qualified; however, its automotive-grade counterpart SZMMBZ5253BLT1G is explicitly listed as AEC-Q101 qualified and PPAP capable in the datasheet. While MMBZ5253BLT1 shares identical electrical characteristics and packaging, it lacks the controlled manufacturing site and change documentation required for automotive use. For body control modules or infotainment systems, designers should specify SZMMBZ5253BLT1G-not MMBZ5253BLT1-to meet OEM qualification requirements.
What is the forward voltage specification of MMBZ5253BLT1, and how is it used in circuit design?
The MMBZ5253BLT1 specifies a maximum forward voltage (VF) of 0.95 V at IF = 10 mA, per the Electrical Characteristics table. This parameter enables dual-use functionality: as a low-drop rectifier or polarity indicator in forward bias, and as a diagnostic path during board-level testing. In practice, designers leverage this spec to verify correct orientation during automated optical inspection (AOI) or to implement simple reverse-polarity protection-without adding discrete diodes. The MMBZ5253BLT1's VF remains stable across its operating temperature range, supporting reliable in-circuit validation.
MMBZ5253BLT1 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):
- 25 V
- Tolerance:
- ±5%
- Power - Max:
- 225 mW
- Impedance (Max) (Zzt):
- 35 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 19 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)
MMBZ5253BLT1 FAQ
1.How can I place an order for MMBZ5253BLT1 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5253BLT1 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 MMBZ5253BLT1 reliable?
The price and inventory of MMBZ5253BLT1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBZ5253BLT1 is usually 5 days.
3.What payment methods are accepted for MMBZ5253BLT1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5253BLT1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5253BLT1?
MMBZ5253BLT1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5253BLT1 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 MMBZ5253BLT1?
For technical support, including MMBZ5253BLT1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5253BLT1 requirements.
6.How does Aetrix verify that MMBZ5253BLT1 is sourced from the original manufacturer or authorized distributors?
All MMBZ5253BLT1 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 MMBZ5253BLT1 meets industry standards.
7.What is the process for return or replacement of MMBZ5253BLT1?
All MMBZ5253BLT1 units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5253BLT1, 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 MMBZ5253BLT1 part is unused and in its original packaging.
Return procedure for MMBZ5253BLT1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MMBZ5253BLT1 Tags
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