My Inquiry
My Account
onsemi SZMMBZ5230BLT1G
- Part No.:
- SZMMBZ5230BLT1G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
SZMMBZ5230BLT1G.pdf
- Description:
- DIODE ZENER 4.7V 225MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:21,737
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SZMMBZ5230BLT1G from onsemi is a 4.7 V ±5% Zener diode in SOT-23 package, rated for 225 mW power dissipation on FR-5 board, with 19 Ω dynamic impedance at 20 mA test current and 5 μA reverse leakage at 2 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 SZMMBZ5230BLT1G datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance (±5%), thermal resistance (556 °C/W), ESD rating (>16 kV HBM), and AEC-Q101 qualification for automotive-grade reliability.
Technical Context
This device operates as a two-terminal voltage reference using avalanche breakdown in silicon PN junction. Its nominal 4.7 V Zener voltage is specified at 20 mA test current (IZT) with temperature coefficient near zero - typical for mid-voltage Zeners in this series - enabling stable regulation across −65°C to +150°C junction range.
The SOT-23 package features pin 1 (anode), pin 2 (no connection), and pin 3 (cathode), with polarity indicated by cathode band. It supports automated placement and reflow soldering up to 260°C for 10 seconds, meeting UL 94 V-0 flammability standard and RoHS compliance with Pb-free, halogen-free/BFR-free construction.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 4.7 V nominal, 4.46–4.94 V min/max at IZT = 20 mA - defines regulated output voltage under normal bias |
| Power Dissipation (PD) | 225 mW on FR-5 board at 25°C - sets maximum continuous power before thermal derating begins |
| Zener Impedance (ZZT) | 19 Ω max at IZT = 20 mA - determines output voltage stability under load transients |
| Reverse Leakage (IR) | 5 μA max at VR = 2 V - ensures low standby current in undervoltage clamp configurations |
| ESD Rating | Class 3 (>16 kV) per Human Body Model - protects against electrostatic discharge during handling and assembly |
| Junction Temp Range | −65°C to +150°C - enables operation in automotive under-hood and industrial control environments |
Pinout & Package
SOT-23 (TO-236) surface-mount package, 2.90 × 1.30 × 1.00 mm, void-free thermosetting plastic case with corrosion-resistant finish. Cathode identified by polarity band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | Connected to lower-potential node in reverse-bias configuration; must be held ≤ VZ below cathode to maintain regulation |
| 2 | No Connection | Internally unconnected; no PCB trace or pad required - avoids unintended parasitic coupling |
| 3 | Cathode | Connected to higher-potential node; polarity band marks this terminal for correct orientation during placement |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 Qualified | Validated for automotive applications including engine control modules and infotainment power supplies |
| 225 mW FR-5 Rating | Enables compact voltage clamping without heatsinking in high-density PCB layouts |
| 19 Ω Zener Impedance | Minimizes output voltage deviation under ±5 mA load variation in feedback-sensing circuits |
| ESD >16 kV HBM | Eliminates need for external ESD protection diodes in USB Type-C and display interface designs |
| Pb-Free / RoHS Compliant | Meets global environmental regulations and supports lead-free reflow profiles without performance compromise |
Applications
| Smartphone Power Rail Protection | Automotive Infotainment USB Port Clamp |
|---|---|
Use Scenario: Clamping transient overvoltage on 5 V USB VBUS line during hot-plug events or ESD strikes. IC Role / Device Role / Timing Role: Two-terminal shunt regulator acting as voltage clamp to divert surge current away from downstream PMIC inputs. Use Value: Limits peak voltage to ≤4.94 V with <5 μA leakage at 2 V, preserving signal integrity and preventing latch-up in USB controller ICs. | Use Scenario: Stabilizing reference voltage for analog sensor signal conditioning in head-unit audio amplifiers. IC Role / Device Role / Timing Role: Precision Zener providing stable 4.7 V bias for op-amp input stages and ADC reference dividers. Use Value: Maintains ±5% regulation across −40°C to +125°C ambient, reducing offset drift in temperature-sensitive audio front-ends. |
| Industrial PLC I/O Module Protection | Medical Wearable Battery Monitor Reference |
Use Scenario: Overvoltage suppression on 24 V DC input terminals exposed to inductive switching transients. IC Role / Device Role / Timing Role: Standby Zener clamp activated only during fault conditions above 4.94 V, minimizing quiescent power draw. Use Value: Withstands 225 mW pulse energy without degradation, enabling robust protection without thermal runaway risk. | Use Scenario: Providing accurate voltage reference for lithium-ion battery cell voltage monitoring in compact wearable patches. IC Role / Device Role / Timing Role: Low-leakage Zener supplying stable bias to comparator inputs used in cell balancing logic. Use Value: 5 μA max leakage at 2 V ensures <1 nA error contribution to 12-bit ADC measurements, supporting ±10 mV 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-C4V7LT1G | Same 4.7 V nominal, but 350 mW rating on FR-4 and 60 Ω ZZT - higher power, lower regulation precision | Preferred where higher surge energy absorption is needed, e.g., industrial fieldbus interfaces | Select when thermal margin >225 mW is required and ±10% VZ tolerance is acceptable |
| SZBZX84C4V7LT1G | AEC-Q101 qualified like SZMMBZ5230BLT1G, but 60 Ω ZZT and 10 μA IR at 2 V - looser regulation and higher leakage | Suitable for non-critical biasing in automotive body control modules where cost sensitivity outweighs precision needs | Choose for cost-optimized automotive designs where 4.7 V reference stability is secondary to qualification status |
Compared with BZX84-C4V7LT1G and SZBZX84C4V7LT1G, SZMMBZ5230BLT1G delivers tighter voltage tolerance (±5% vs ±10%), lower dynamic impedance (19 Ω vs 60 Ω), and lower leakage (5 μA vs 10 μA), making it optimal for precision analog sensing and low-power portable regulation where board space and thermal constraints are critical.
Availability
SZMMBZ5230BLT1G is available at Aetrix Electronics and suitable for smartphone power management, automotive USB port protection, and industrial I/O module voltage clamping requiring stable component supply and AEC-Q101 compliance.
Supply support for SZMMBZ5230BLT1G 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 (Semiconductor Components Industries, LLC) is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The MMBZ52xxBLT1G/SZMMBZ52xxBLT1G series was designed specifically for space-constrained, high-reliability voltage regulation in portable and automotive electronics - emphasizing low-profile packaging, AEC-Q101 qualification, and robust ESD immunity.
FAQ
What is the Zener voltage tolerance of SZMMBZ5230BLT1G?
The SZMMBZ5230BLT1G has a Zener voltage tolerance of ±5% around its nominal 4.7 V rating, meaning the actual measured VZ falls between 4.46 V and 4.94 V when tested at IZT = 20 mA and TA = 25°C. This tight tolerance ensures predictable clamping behavior in precision voltage reference and overvoltage protection circuits where consistent trip points are essential. The SZMMBZ5230BLT1G achieves this via process-controlled doping and post-trim testing.
Is SZMMBZ5230BLT1G suitable for automotive applications?
Yes, SZMMBZ5230BLT1G is AEC-Q101 qualified and PPAP capable, with manufacturing site and change controls specific to automotive requirements (indicated by the "SZ" prefix). It operates reliably across −65°C to +150°C junction temperature and meets >16 kV HBM ESD immunity - making it appropriate for engine control units, infotainment systems, and ADAS power rail protection. The SZMMBZ5230BLT1G also complies with RoHS and halogen-free standards required for modern vehicle platforms.
What is the thermal resistance of SZMMBZ5230BLT1G on FR-5 board?
The thermal resistance from junction-to-ambient (RJA) for SZMMBZ5230BLT1G is 556 °C/W when mounted on an FR-5 board. This value reflects heat dissipation capability under standard JEDEC test conditions (1.0 × 0.75 × 0.62 inch board), and directly determines how much temperature rise occurs per milliwatt of power dissipated. At its 225 mW rating, this results in a ~125°C junction-to-ambient rise - confirming why derating is required above 25°C ambient. The SZMMBZ5230BLT1G datasheet specifies 1.8 mW/°C linear derating above that point.
Does SZMMBZ5230BLT1G have a no-connect pin, and how should it be handled on PCB?
Yes, SZMMBZ5230BLT1G has pin 2 designated as "No Connection" - it is internally unconnected and electrically isolated. On PCB layout, no copper trace or pad is required for pin 2; leaving it unconnected avoids parasitic capacitance or unintended coupling paths. The device uses pin 1 (anode) and pin 3 (cathode) exclusively for operation. This NC pin configuration is confirmed in the mechanical outline (Style 8) and electrical characteristics table of the official onsemi datasheet for SZMMBZ5230BLT1G.
How does the ESD rating of SZMMBZ5230BLT1G compare to standard Zener diodes?
SZMMBZ5230BLT1G is rated Class 3 (>16 kV) per Human Body Model (HBM), significantly exceeding the typical 2–4 kV rating of generic Zener diodes. This high ESD immunity is achieved through specialized junction design and passivation, allowing direct integration into ESD-prone interfaces like USB ports and display connectors without supplemental TVS devices. The SZMMBZ5230BLT1G's robustness reduces BOM count and improves system-level ESD test pass rates in portable and automotive electronics.
SZMMBZ5230BLT1G 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):
- 4.7 V
- Tolerance:
- ±5%
- Power - Max:
- 225 mW
- Impedance (Max) (Zzt):
- 19 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 2 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)
SZMMBZ5230BLT1G FAQ
1.How can I place an order for SZMMBZ5230BLT1G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZMMBZ5230BLT1G 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 SZMMBZ5230BLT1G reliable?
The price and inventory of SZMMBZ5230BLT1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZMMBZ5230BLT1G is usually 5 days.
3.What payment methods are accepted for SZMMBZ5230BLT1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZMMBZ5230BLT1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZMMBZ5230BLT1G?
SZMMBZ5230BLT1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZMMBZ5230BLT1G 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 SZMMBZ5230BLT1G?
For technical support, including SZMMBZ5230BLT1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZMMBZ5230BLT1G requirements.
6.How does Aetrix verify that SZMMBZ5230BLT1G is sourced from the original manufacturer or authorized distributors?
All SZMMBZ5230BLT1G 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 SZMMBZ5230BLT1G meets industry standards.
7.What is the process for return or replacement of SZMMBZ5230BLT1G?
All SZMMBZ5230BLT1G units undergo pre-shipment inspection (PSI). If there is an issue with SZMMBZ5230BLT1G, 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 SZMMBZ5230BLT1G part is unused and in its original packaging.
Return procedure for SZMMBZ5230BLT1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SZMMBZ5230BLT1G 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…
