My Inquiry
My Account
onsemi MMSZ5226ET1G
- Part No.:
- MMSZ5226ET1G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
MMSZ5226ET1G.pdf
- Description:
- DIODE ZENER 3.3V 500MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:3,762
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MMSZ5226ET1G from onsemi is a 3.3 V ±5% Zener diode in SOD-123 package, rated for 500 mW power dissipation at 75 °C on FR-5 board, with 28 Ω dynamic impedance at 20 mA test current and 0.25 μA leakage current at 25 V reverse bias. It serves as a precision voltage reference or overvoltage clamp in low-power analog and digital supply rails.
For engineers reviewing the MMSZ5226ET1G datasheet, pinout, applications, or equivalent options, key selection criteria include nominal Zener voltage tolerance, thermal derating behavior, junction-to-lead thermal resistance, ESD robustness (Class 3 HBM >16 kV), and SOD-123 footprint compatibility with automated assembly.
Technical Context
This device operates in reverse breakdown to maintain stable voltage regulation under varying load and temperature conditions. Its Zener impedance of 28 Ω at IZT = 20 mA and 1600 Ω at IZK = 0.25 mA defines its regulation fidelity across current range, while thermal resistance RJL = 150 °C/W enables predictable junction temperature rise during transient surges.
The MMSZ5226ET1G exhibits a negative temperature coefficient typical of low-voltage Zeners (~−2 mV/°C near 3.3 V), requiring attention in wide-temperature designs. Its 225 W nonrepetitive peak surge rating (8 × 20 μs) supports transient suppression in low-energy circuits without external series limiting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 3.14–3.47 V @ IZT = 20 mA - defines regulated output voltage window under nominal bias |
| Power Dissipation (PD) | 500 mW @ TL = 75 °C - maximum continuous power on FR-5 board before thermal derating begins |
| Zener Impedance (ZZT) | 28 Ω @ IZT = 20 mA - AC resistance determining voltage stability under small-signal load variation |
| Leakage Current (IR) | 0.25 μA @ VR = 25 V - ensures minimal quiescent current draw below breakdown threshold |
| ESD Rating | Class 3 (>16 kV) per HBM - qualifies for handling in standard electrostatic protected areas without special precautions |
| Package | SOD-123 (1.60 × 2.69 × 1.16 mm) - surface-mount footprint compatible with high-density PCB layouts and reflow soldering |
| Operating Temperature | −55 °C to +150 °C - supports industrial and automotive under-hood applications with full parameter validity |
Pinout & Package
SOD-123 package with cathode indicated by polarity band; compact 2-pin surface-mount outline optimized for automated placement and thermal performance on FR-4/FR-5 boards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Banded End) | Cathode | Connected to regulated voltage node; reverse-biased terminal where Zener breakdown occurs |
| 2 (Non-banded End) | Anode | Connected to circuit ground or lower-potential rail; completes reverse-bias path for regulation |
Key Features
| Feature | Design Value |
|---|---|
| 500 mW Power Rating | Enables use in medium-current reference and clamping roles without heatsinking on standard PCBs |
| ±5% Zener Voltage Tolerance | Provides predictable regulation accuracy suitable for non-critical voltage monitoring and biasing |
| Class 3 HBM ESD Robustness | Eliminates need for external ESD protection in board-level handling and integration |
| Small SOD-123 Footprint | Supports high-density routing in space-constrained consumer and portable electronics |
| Pb-Free Construction | Meets RoHS Directive 2011/65/EU and JEDEC J-STD-020 reflow profile requirements |
Applications
| USB Port Overvoltage Protection | Microcontroller Reset Circuit Reference |
|---|---|
Use Scenario: Clamping 5 V USB VBUS line against transient spikes exceeding 5.5 V during hot-plug events. IC Role / Device Role / Timing Role: Zener diode acting as shunt overvoltage protector, diverting excess energy to ground when VBUS exceeds 3.3 V + margin. Use Value: Prevents damage to downstream 3.3 V logic interfaces using only passive components and no active control. | Use Scenario: Providing stable 3.3 V threshold for microcontroller reset supervisor ICs in battery-powered IoT nodes. IC Role / Device Role / Timing Role: Precision voltage reference establishing reliable reset assertion level independent of supply ripple. Use Value: Ensures deterministic reset behavior across temperature and aging, avoiding spurious resets due to reference drift. |
| Low-Power Sensor Biasing | ADC Reference Stabilization |
Use Scenario: Supplying stable bias voltage to analog sensor front-ends operating from unregulated coin-cell sources. IC Role / Device Role / Timing Role: Low-quiescent-current Zener regulator maintaining constant excitation voltage for resistive sensors. Use Value: Reduces measurement error caused by supply-dependent sensor gain and offset shifts. | Use Scenario: Stabilizing reference input to 10-bit SAR ADCs in industrial data loggers with variable supply rails. IC Role / Device Role / Timing Role: Passive voltage reference source improving effective number of bits (ENOB) by reducing reference noise. Use Value: Achieves <±0.5 LSB integral nonlinearity without requiring dedicated voltage reference ICs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX584-C3V3 | Same 3.3 V nominal Zener voltage, but 350 mW rating and SOD-323 package (smaller footprint, higher thermal resistance) | Lower power handling limits use in sustained clamp scenarios; preferred only where board area is critical | Select BZX584-C3V3 only when SOD-323 footprint is mandated and peak power remains <350 mW |
| MMBZ5226ET1G | Identical electrical specs and SOD-123 package, but offered in 3 kpcs tape-and-reel vs. 10 kpcs for MMSZ5226ET1G | No functional difference; identical performance and layout compatibility | MMBZ5226ET1G is a direct form-fit-function alternative with same thermal and electrical behavior |
Compared with BZX584-C3V3 and MMBZ5226ET1G, the MMSZ5226ET1G offers superior thermal capability (500 mW vs. 350 mW) and standardized high-volume packaging, making it optimal for production-scale power-sensitive designs requiring long-term reliability.
Availability
MMSZ5226ET1G is available at Aetrix Electronics and suitable for USB interface protection, microcontroller reset supervision, and low-power sensor biasing requiring stable component supply and consistent parametric performance across manufacturing lots.
Supply support for MMSZ5226ET1G 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 delivering energy-efficient power and sensing solutions for automotive, industrial, cloud, and consumer applications.
The MMSZ52xxET1G series targets cost-sensitive, high-volume applications requiring reliable, standardized Zener regulation in compact surface-mount packages-designed specifically for board-level voltage referencing and transient clamping without active circuitry.
FAQ
What is the nominal Zener voltage and tolerance of the MMSZ5226ET1G?
The MMSZ5226ET1G has a nominal Zener voltage of 3.3 V with a standard tolerance of ±5%, resulting in a guaranteed range of 3.14 V to 3.47 V at 20 mA test current and 25 °C ambient. This tolerance is specified per onsemi's datasheet revision 10 and applies across the full operating temperature range when used within thermal limits.
What is the maximum power dissipation for MMSZ5226ET1G on a standard PCB?
The MMSZ5226ET1G is rated for 500 mW total power dissipation on an FR-5 board at lead temperature (TL) = 75 °C, derating linearly at 6.7 mW/°C above that point. This rating assumes use of the minimum recommended footprint per onsemi's mechanical drawing CASE 425 STYLE 1.
Does MMSZ5226ET1G have automotive qualification?
The MMSZ5226ET1G itself is not AEC-Q101 qualified; however, the SZMMSZ5226ET1G variant (with SZ prefix) is AEC-Q101 qualified and PPAP capable. Engineers requiring automotive-grade assurance must specify the SZ-prefixed part number, as the standard MMSZ5226ET1G is intended for industrial and commercial applications.
What is the Zener impedance of MMSZ5226ET1G and why does it matter?
The MMSZ5226ET1G has a maximum Zener impedance (ZZT) of 28 Ω at IZT = 20 mA, measured with 1 kHz AC signal at 0.1× DC bias. This value determines how tightly the device maintains its regulated voltage under changing load current-lower impedance yields better regulation stability in precision reference applications.
Can MMSZ5226ET1G be used for ESD protection in USB 2.0 data lines?
No-MMSZ5226ET1G is not suitable for high-speed data line ESD protection due to its relatively high capacitance (typ. >100 pF at 0 V bias) and slow response compared to purpose-built TVS diodes. It is designed for DC voltage regulation and low-frequency clamping, not signal integrity preservation on differential data paths.
MMSZ5226ET1G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- MMSZ52xxxT1G
- Package/Case:
- SOD-123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 3.3 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 28 Ohms
- Current - Reverse Leakage @ Vr:
- 25 µA @ 1 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:
- SOD-123
MMSZ5226ET1G FAQ
1.How can I place an order for MMSZ5226ET1G through Aetrix?
Please submit a Request for Quotation (RFQ) for MMSZ5226ET1G 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 MMSZ5226ET1G reliable?
The price and inventory of MMSZ5226ET1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMSZ5226ET1G is usually 5 days.
3.What payment methods are accepted for MMSZ5226ET1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ5226ET1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMSZ5226ET1G?
MMSZ5226ET1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMSZ5226ET1G 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 MMSZ5226ET1G?
For technical support, including MMSZ5226ET1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ5226ET1G requirements.
6.How does Aetrix verify that MMSZ5226ET1G is sourced from the original manufacturer or authorized distributors?
All MMSZ5226ET1G 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 MMSZ5226ET1G meets industry standards.
7.What is the process for return or replacement of MMSZ5226ET1G?
All MMSZ5226ET1G units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ5226ET1G, 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 MMSZ5226ET1G part is unused and in its original packaging.
Return procedure for MMSZ5226ET1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MMSZ5226ET1G 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…
