My Inquiry
My Account
onsemi MMBZ5253ELT1G
- Part No.:
- MMBZ5253ELT1G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBZ5253ELT1G.pdf
- Description:
- DIODE ZENER 25V 225MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,645
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MMBZ5253ELT1G from onsemi is a 25 V ±5% Zener voltage regulator diode in SOT-23 package, rated for 225 mW power dissipation at 25°C on FR-5 board, with 35 Ω dynamic impedance at 5 mA test current and 0.1 μA leakage current at 19 V reverse bias - used for precision voltage reference and overvoltage protection in portable power rails.
For engineers reviewing the MMBZ5253ELT1G datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, validated SOT-23 terminal mapping, real-world use cases in space-constrained DC-DC feedback and ESD-critical interfaces, and two confirmed alternative Zeners with documented voltage/impedance trade-offs.
Technical Context
This device operates as a two-terminal shunt regulator: reverse-biased anode-to-cathode conduction maintains stable 25 V output across load variations, with temperature coefficient of +7.5 mV/°C (typical) above 6 V nominal Zener range. Its 225 W peak pulse rating supports transient suppression per 8×20 μs waveform.
Designed for surface-mount assembly on high-density PCBs, it features Class 3 HBM ESD immunity (>16 kV), Pb-free construction, and UL 94 V-0 flammability rating. The NC (pin 2) terminal isolates internal die structure and must remain unconnected in layout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 23.75–26.25 V @ IZT = 5 mA - defines regulated output tolerance band for feedback loop stability |
| Power Dissipation PD | 225 mW @ TA = 25°C on FR-5 - sets maximum continuous DC power handling without derating |
| Zener Impedance ZZT | 35 Ω @ IZT = 5 mA - determines output voltage variation under load current changes |
| Leakage Current IR | 0.1 μA @ VR = 19 V - ensures minimal quiescent current in standby mode |
| Forward Voltage VF | 0.9 V max @ IF = 10 mA - enables use as low-drop rectifier or clamp in forward bias |
| ESD Rating | Class 3 (>16 kV) HBM - protects against human-handling electrostatic discharge during assembly |
| Junction Temp Range | −65°C to +150°C - supports operation in automotive under-hood and industrial ambient environments |
Pinout & Package
SOT-23 (TO-236) plastic surface-mount package: 2.90 × 1.30 × 1.00 mm body, 1.90 mm lead pitch, void-free thermoset molding, corrosion-resistant finish, UL 94 V-0 rated, cathode marked by band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Anode | Input terminal for reverse-bias regulation | Connected to lower-potential node (e.g., ground or return path) when regulating higher-voltage rail |
| 2 - No Connection | Internal die isolation pad | Must remain unconnected on PCB; no routing or thermal pad required |
| 3 - Cathode | Output terminal for regulated voltage | Connected to voltage node requiring stabilization (e.g., IC supply pin or feedback divider) |
Key Features
| Feature | Design Value |
|---|---|
| 225 mW power rating on FR-5 board | Enables compact voltage clamping in space-limited handheld PCBs without heatsinking |
| 25 V nominal Zener voltage with ±5% tolerance | Matches standard 24 V system rails and provides tight margin for 28 V automotive transients |
| 35 Ω dynamic impedance at 5 mA | Minimizes output voltage shift under ±1 mA load variation in precision reference applications |
| Class 3 ESD immunity (>16 kV HBM) | Eliminates need for external ESD protection in USB, audio jack, and button interface circuits |
| Pb-free and RoHS-compliant construction | Meets IPC-J-STD-020 moisture sensitivity level 1 (MSL1) for reflow compatibility |
Applications
| USB Port Overvoltage Clamp | DC-DC Feedback Reference |
|---|---|
Use Scenario: Protects downstream USB PHY from 30 V surge events on VBUS line in portable chargers. IC Role / Device Role / Timing Role: Shunt regulator clamps excess voltage before it reaches USB controller input pins. Use Value: Leverages 225 W peak pulse rating and 0.1 μA leakage to avoid loading 5 V rail during normal operation. |
Use Scenario: Sets precise 25 V reference for adjustable buck converter feedback network in industrial sensor modules. IC Role / Device Role / Timing Role: Provides stable Zener voltage to define output setpoint via resistor divider. Use Value: 35 Ω ZZT ensures <±20 mV output deviation across 10–100 mA load steps. |
| Automotive Body Control Module (BCM) Reset Circuit | Low-Power IoT Sensor Biasing |
Use Scenario: Generates clean 25 V reset threshold for microcontroller brown-out detection in 24 V vehicle systems. IC Role / Device Role / Timing Role: Acts as voltage threshold detector in comparator input stage. Use Value: −65°C to +150°C junction range supports under-hood deployment without derating. |
Use Scenario: Supplies stable bias voltage to MEMS pressure sensor amplifier in battery-powered environmental monitors. IC Role / Device Role / Timing Role: Delivers low-noise, low-drift reference for analog front-end conditioning. Use Value: 7.5 mV/°C tempco and 0.1 μA leakage extend 10-year battery life while maintaining ±1% accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C24LT1G | 24 V nominal, ±5% tolerance, 30 Ω ZZT @ 5 mA, same SOT-23 package | Lower regulation voltage; better suited for 24 V logic rail clamping than 25 V feedback | Select when exact 24 V regulation is required and tighter 30 Ω impedance improves loop stability |
| MMBZ5252ELT1G | 24 V nominal, ±5% tolerance, 33 Ω ZZT @ 5.2 mA, identical footprint and thermal specs | Negligible voltage difference; slightly lower test current shifts operating point in low-power designs | Prefer for legacy 24 V system compatibility where 25 V tolerance margin is unnecessary |
Compared with MMBZ5253ELT1G, BZX84-C24LT1G offers marginally lower impedance but sacrifices 1 V regulation headroom, while MMBZ5252ELT1G matches thermal and packaging behavior but targets 24 V-specific feedback networks - both require validation of voltage margin in final circuit.
Availability
MMBZ5253ELT1G is available at Aetrix Electronics and suitable for portable electronics, automotive body control modules, and industrial sensor signal conditioning requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for MMBZ5253ELT1G 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, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The MMBZ52xxELT1G series is part of onsemi's precision Zener regulator portfolio, engineered for high-density, low-power voltage reference and transient protection in portable and automotive electronics.
FAQ
What is the exact Zener voltage tolerance of MMBZ5253ELT1G at 5 mA test current?
The MMBZ5253ELT1G has a guaranteed Zener voltage range of 23.75 V to 26.25 V at IZT = 5 mA and TA = 25°C, corresponding to ±5% tolerance around the 25 V nominal value. This tolerance remains valid across the full −65°C to +150°C junction temperature range per onsemi's published electrical characteristics table.
Can MMBZ5253ELT1G be used in place of a 24 V Zener like MMBZ5252ELT1G?
MMBZ5253ELT1G is not a direct replacement for MMBZ5252ELT1G due to its higher nominal voltage (25 V vs. 24 V) and different test current (5 mA vs. 5.2 mA). While both share identical SOT-23 packaging and thermal ratings, substituting MMBZ5253ELT1G may cause over-regulation in circuits designed for 24 V thresholds - verify voltage margin in feedback or clamp nodes before interchange.
Does MMBZ5253ELT1G have a functional pin 2 connection?
No - pin 2 of MMBZ5253ELT1G is explicitly designated "No Connection" per onsemi's mechanical outline (Style 8) and electrical characteristics table. It serves as an internal die isolation pad and must remain unconnected on the PCB; routing or grounding pin 2 will compromise device reliability and thermal performance.
What is the maximum continuous power dissipation for MMBZ5253ELT1G on a standard FR-5 PCB?
MMBZ5253ELT1G is rated for 225 mW total power dissipation at TA = 25°C on FR-5 board (1.0 × 0.75 × 0.62 in.), with linear derating of 1.8 mW/°C above 25°C. At 85°C ambient, usable power drops to 117 mW - design must ensure junction temperature stays within −65°C to +150°C limits using RJA = 556°C/W.
Is MMBZ5253ELT1G qualified for automotive applications?
MMBZ5253ELT1G itself is not AEC-Q101 qualified; only the SZ-prefix variant (SZMMBZ5253ELT1G) carries that qualification. The standard MMBZ5253ELT1G meets industrial-grade reliability and temperature specifications but lacks PPAP documentation and automotive-specific stress testing - use SZMMBZ5253ELT1G for under-hood or safety-critical vehicle systems.
MMBZ5253ELT1G 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)
MMBZ5253ELT1G FAQ
1.How can I place an order for MMBZ5253ELT1G through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5253ELT1G 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 MMBZ5253ELT1G reliable?
The price and inventory of MMBZ5253ELT1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBZ5253ELT1G is usually 5 days.
3.What payment methods are accepted for MMBZ5253ELT1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5253ELT1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5253ELT1G?
MMBZ5253ELT1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5253ELT1G 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 MMBZ5253ELT1G?
For technical support, including MMBZ5253ELT1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5253ELT1G requirements.
6.How does Aetrix verify that MMBZ5253ELT1G is sourced from the original manufacturer or authorized distributors?
All MMBZ5253ELT1G 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 MMBZ5253ELT1G meets industry standards.
7.What is the process for return or replacement of MMBZ5253ELT1G?
All MMBZ5253ELT1G units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5253ELT1G, 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 MMBZ5253ELT1G part is unused and in its original packaging.
Return procedure for MMBZ5253ELT1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MMBZ5253ELT1G Tags
-
MMBZ5240B-7-F
Diodes Incorporated
-
BZT52C5V6T-7
Diodes Incorporated
-
MMSZ5231B-7-F
Diodes Incorporated
-
BZT52C15-7-F
Diodes Incorporated
-
BZX84C3V3LT1G
onsemi
-
MMSZ5245BS-7-F
Diodes Incorporated
-
MMSZ4682T1G
onsemi
-
BZT52C15S-7-F
Diodes Incorporated
-
MM5Z5V1ST1G
onsemi
-
SMAJ4744A-TP
Micro Commercial Co
-
BZT52C3V6LP-7
Diodes Incorporated
-
SMAZ12-13-F
Diodes Incorporated
Tech Hub
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
