My Inquiry
My Account
onsemi SZMMBZ5253BLT1G
- Part No.:
- SZMMBZ5253BLT1G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
SZMMBZ5253BLT1G.pdf
- Description:
- DIODE ZENER 25V 225MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:11,980
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SZMMBZ5253BLT1G from onsemi is a 25 V ±5% Zener diode in SOT-23 package, rated for 225 mW power dissipation on FR-5 board, with 5 mA test current, 35 Ω dynamic impedance at IZT, and 0.1 μA reverse leakage at 19 V. It provides precision voltage regulation in space-constrained portable electronics such as smartphone power rails and USB interface protection circuits.
For engineers reviewing the SZMMBZ5253BLT1G datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance (±5%), thermal resistance (556 °C/W), ESD rating (>16 kV HBM), automotive qualification (AEC-Q101), and Pb-free RoHS compliance.
Technical Context
This device operates as a two-terminal voltage reference using avalanche breakdown in silicon PN junction. Its nominal 25 V Zener voltage is specified at 5 mA test current (IZT) with ±5% tolerance, and exhibits 35 Ω dynamic impedance (ZZT) under that condition. Temperature coefficient is +5.5 mV/°C near 25 V, supporting stable regulation across −65°C to +150°C junction range.
The SOT-23 package features three terminals: Pin 1 (Anode), Pin 2 (No Connection), Pin 3 (Cathode), with cathode polarity marked by band. It delivers 225 mW power handling on FR-5 board (derated 1.8 mW/°C above 25°C) and meets Class 3 ESD immunity (>16 kV HBM).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 23.75–26.25 V @ IZT = 5 mA - defines regulated output voltage window under standard test conditions |
| Power Dissipation (PD) | 225 mW on FR-5 board @ TA = 25°C - sets maximum continuous power before thermal derating applies |
| Zener Impedance (ZZT) | 35 Ω @ IZT = 5 mA - determines output voltage stability under load current variation |
| Reverse Leakage (IR) | 0.1 μA @ VR = 19 V - ensures minimal standby current in undervoltage clamp configurations |
| ESD Rating | Class 3 (>16 kV) per HBM - enables robust handling in automated assembly and end-user environments |
| Junction Temp Range | −65°C to +150°C - supports operation in automotive under-hood and industrial control applications |
| AEC-Q101 Qualified | Yes - confirms reliability validation for automotive electronic systems per stress test requirements |
Pinout & Package
SOT-23 (TO-236) surface-mount plastic package, dimensions 2.90 × 1.30 × 1.00 mm, void-free thermosetting case with corrosion-resistant finish, UL 94 V-0 flammability rating, and 260°C max soldering temperature for 10 seconds.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | Connected to lower-potential side of regulated node; reverse-biased during Zener operation |
| 2 | No Connection | Internally unconnected; must remain floating - no PCB trace or pad required |
| 3 | Cathode | Connected to higher-potential side; polarity band on package identifies this terminal |
Key Features
| Feature | Design Value |
|---|---|
| Automotive-grade qualification | AEC-Q101 qualified and PPAP capable - enables direct use in Tier-1 automotive modules without requalification |
| Pb-free and RoHS compliance | Fully compliant with EU RoHS Directive 2011/65/EU and halogen-free/BFR-free - satisfies global environmental compliance mandates |
| High-density packaging | SOT-23 footprint (2.9 × 1.3 mm) - reduces PCB area by >60% vs. DO-35, enabling miniaturized portable designs |
| ESD-hardened construction | Class 3 HBM (>16 kV) - eliminates need for external ESD protection in low-energy signal paths |
| Stable voltage reference | +5.5 mV/°C tempco near 25 V - enables predictable drift compensation in temperature-sensitive analog circuits |
Applications
| USB Power Rail Clamp | Automotive Sensor Reference |
|---|---|
Use Scenario: Clamping transient overvoltage on 5 V USB VBUS line during hot-plug events or ESD discharge. IC Role / Device Role / Timing Role: Two-terminal shunt regulator acting as voltage clamp between VBUS and GND. Use Value: Limits peak voltage to ≤26.25 V with <0.1 μA leakage below 19 V, protecting downstream USB controllers without loading the rail. |
Use Scenario: Providing stable 25 V reference for pressure sensor excitation in engine control units. IC Role / Device Role / Timing Role: Precision Zener reference source for ratiometric bridge biasing. Use Value: Maintains ±5% regulation across −40°C to +125°C ambient with AEC-Q101 validated reliability. |
| Portable Device Battery Monitor | Industrial PLC Input Protection |
Use Scenario: Monitoring Li-ion battery pack voltage via resistive divider with overvoltage cutoff. IC Role / Device Role / Timing Role: Zener-based overvoltage detection node tied to microcontroller ADC input. Use Value: Triggers fault flag when divided battery voltage exceeds 25 V threshold, with 35 Ω ZZT ensuring sharp turn-on. |
Use Scenario: Protecting 24 V DC digital input channels from surges and miswiring in factory automation panels. IC Role / Device Role / Timing Role: Shunt clamp absorbing transient energy before it reaches optocoupler input stage. Use Value: Handles repetitive 225 mW pulses without degradation, validated for 150°C junction operation in enclosed enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBZ5253BLT1G | Same electrical specs (23.75–26.25 V, 35 Ω ZZT, 0.1 μA IR), but not AEC-Q101 qualified; no SZ prefix. | Limited to commercial/industrial use; excluded from automotive BOMs requiring PPAP documentation. | Select when automotive qualification is unnecessary and cost sensitivity outweighs supply chain traceability needs. |
| BZX84-C24LT1G | 24 V nominal (22.8–25.2 V), 225 mW, SOT-23, but ZZT = 90 Ω @ 5 mA and no AEC-Q101 certification. | Higher impedance reduces regulation accuracy under dynamic load; unsuitable for precision references. | Choose only for non-critical clamping where tighter voltage tolerance and lower ZZT are not required. |
Compared with MMBZ5253BLT1G and BZX84-C24LT1G, SZMMBZ5253BLT1G uniquely combines AEC-Q101 qualification, ±5% VZ tolerance, and 35 Ω ZZT in SOT-23 - making it the sole option for automotive-grade 25 V shunt regulation with production traceability.
Availability
SZMMBZ5253BLT1G is available at Aetrix Electronics and suitable for automotive ECUs, portable medical monitors, industrial PLC I/O modules, and high-density consumer electronics requiring stable component supply and full lifecycle support.
Supply support for SZMMBZ5253BLT1G 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 management, analog, sensors, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The MMBZ52xxBLT1G/SZMMBZ52xxBLT1G series was designed specifically for compact, high-reliability voltage regulation in space-constrained portable and automotive electronics - emphasizing low-profile packaging, high ESD immunity, and AEC-Q101 compliance.
FAQ
What is the Zener voltage tolerance of SZMMBZ5253BLT1G?
The SZMMBZ5253BLT1G has a Zener voltage tolerance of ±5% around its nominal 25 V rating, meaning the actual measured VZ falls within 23.75 V to 26.25 V at IZT = 5 mA and TA = 25°C. This tight tolerance ensures predictable clamping behavior in precision reference and overvoltage protection circuits where SZMMBZ5253BLT1G is deployed.
Is SZMMBZ5253BLT1G suitable for automotive applications?
Yes, SZMMBZ5253BLT1G is AEC-Q101 qualified and PPAP capable, confirming its suitability for automotive applications including engine control units, body electronics, and ADAS sensor interfaces. The "SZ" prefix explicitly denotes automotive-grade process control and site-specific change management - a requirement not met by standard MMBZ5253BLT1G, which lacks this qualification.
What is the thermal resistance of SZMMBZ5253BLT1G on FR-5 board?
The junction-to-ambient thermal resistance (RJA) of SZMMBZ5253BLT1G is 556 °C/W when mounted on FR-5 board. This value governs how much the junction temperature rises per milliwatt of dissipated power - critical for thermal design in sealed enclosures. At 225 mW dissipation, ΔTJ = 125°C, placing the absolute max junction temperature at 150°C when ambient is 25°C, matching the device's rated TJ limit.
Does SZMMBZ5253BLT1G have a no-connect pin, and how should it be handled on PCB?
Yes, SZMMBZ5253BLT1G has Pin 2 designated as "No Connection" per onsemi's mechanical outline (Style 8). This terminal is internally unconnected and must remain electrically floating - no PCB trace, pad, or ground connection should be made to it. Incorrect routing to ground or signal nets may cause assembly defects or functional failure, so layout files must explicitly exclude Pin 2 from net assignments.
How does the ESD rating of SZMMBZ5253BLT1G impact system-level design?
SZMMBZ5253BLT1G carries Class 3 Human Body Model ESD rating (>16 kV), meaning it can withstand repeated electrostatic discharges up to that level without parametric shift or failure. This allows direct placement on exposed I/O lines (e.g., USB, sensor inputs) without supplemental TVS diodes in many cases - simplifying BOM, reducing board area, and lowering system cost while maintaining IEC 61000-4-2 Level 4 robustness when used per datasheet layout guidelines.
SZMMBZ5253BLT1G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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:
- -65°C ~ 150°C
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3 (TO-236)
SZMMBZ5253BLT1G FAQ
1.How can I place an order for SZMMBZ5253BLT1G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZMMBZ5253BLT1G 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 SZMMBZ5253BLT1G reliable?
The price and inventory of SZMMBZ5253BLT1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZMMBZ5253BLT1G is usually 5 days.
3.What payment methods are accepted for SZMMBZ5253BLT1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZMMBZ5253BLT1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZMMBZ5253BLT1G?
SZMMBZ5253BLT1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZMMBZ5253BLT1G 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 SZMMBZ5253BLT1G?
For technical support, including SZMMBZ5253BLT1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZMMBZ5253BLT1G requirements.
6.How does Aetrix verify that SZMMBZ5253BLT1G is sourced from the original manufacturer or authorized distributors?
All SZMMBZ5253BLT1G 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 SZMMBZ5253BLT1G meets industry standards.
7.What is the process for return or replacement of SZMMBZ5253BLT1G?
All SZMMBZ5253BLT1G units undergo pre-shipment inspection (PSI). If there is an issue with SZMMBZ5253BLT1G, 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 SZMMBZ5253BLT1G part is unused and in its original packaging.
Return procedure for SZMMBZ5253BLT1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SZMMBZ5253BLT1G 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…
