My Inquiry
My Account
onsemi MMSZ20T1
- Part No.:
- MMSZ20T1
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
MMSZ20T1.pdf
- Description:
- DIODE ZENER 20V 500MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:5,457
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MMSZ20T1 from onsemi is a 20 V ±5% Zener voltage regulator diode in SOD−123 surface-mount package, rated for 500 mW power dissipation at 75°C ambient, with 55 Ω dynamic impedance at 5 mA test current and 0.05 μA reverse leakage at 14 V. It serves as a precision voltage reference or overvoltage clamp in low-power analog and power management circuits.
For engineers reviewing the MMSZ20T1 datasheet, pinout, applications, or equivalent options, this device is selected for stable 20 V regulation in space-constrained DC-DC feedback networks, sensor biasing, and ESD-protected I/O clamping where AEC−Q101 qualification and 16 kV HBM ESD robustness are required.
Technical Context
This Zener diode operates in reverse breakdown to maintain a stable 20 V reference across load variations, with nominal Zener voltage measured at 5 mA (IZT1) and 1 mA (IZT2) test currents. Its temperature coefficient is +3.8 mV/°C near 20 V, enabling predictable drift compensation in industrial temperature ranges.
The device features a cathode-band polarity indicator, UL 94 V−0 flammability rating, and Pb−free construction compliant with RoHS. Thermal resistance junction-to-ambient is 340°C/W, limiting continuous power handling under natural convection on FR−5 board.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 19.0–21.0 V at IZT = 5 mA - defines regulated output range for feedback or reference use |
| Dynamic Impedance (ZZT) | 55 Ω max at IZT = 5 mA - determines regulation stiffness and AC ripple rejection |
| Reverse Leakage (IR) | 0.05 μA max at VR = 14 V - ensures minimal quiescent current in standby clamping |
| Power Dissipation (PD) | 500 mW on FR−5 board at TL = 75°C - sets maximum steady-state thermal load |
| ESD Rating | Class 3 (>16 kV) per HBM - enables direct placement on ESD-sensitive signal lines |
| Operating Temp Range | −55°C to +150°C - supports automotive under-hood and industrial control environments |
Pinout & Package
SOD−123 surface-mount plastic package (1.60 × 2.69 × 1.16 mm), void-free thermosetting case with corrosion-resistant, solderable finish. Cathode identified by band; polarity critical for correct Zener operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Banded End) | Cathode | Connected to regulated voltage node; reverse-biased during Zener operation |
| 2 (Non-banded End) | Anode | Connected to circuit ground or lower potential; completes reverse-bias path |
Key Features
| Feature | Design Value |
|---|---|
| AEC−Q101 Qualified | Validated for automotive electronics including engine control and body modules |
| 500 mW Power Rating | Enables use in mid-range voltage reference and transient suppression without heatsinking |
| ±5% Zener Tolerance | Supports cost-effective precision regulation without post-production trimming |
| Small SOD−123 Footprint | Allows high-density placement in portable and IoT devices with strict PCB area limits |
| UL 94 V−0 Flammability | Meets safety requirements for enclosed industrial and medical power supplies |
Applications
| Automotive Sensor Biasing | Industrial ADC Reference |
|---|---|
Use Scenario: Providing stable 20 V bias to analog pressure or temperature sensors in engine control units. IC Role / Device Role / Timing Role: Zener voltage reference establishing fixed excitation voltage for ratiometric sensor outputs. Use Value: Maintains sensor accuracy across −40°C to +125°C ambient with <±0.5% drift due to tight 5% tolerance and known TC. |
Use Scenario: Supplying reference voltage to 12-bit SAR ADCs in programmable logic controllers. IC Role / Device Role / Timing Role: Low-noise, low-drift voltage source replacing larger three-terminal regulators in isolated analog front-ends. Use Value: Delivers 20 V reference with 55 Ω dynamic impedance, reducing code spread caused by supply variation in high-resolution digitization. |
| USB-C Port Overvoltage Clamp | IoT Node Power Sequencing |
Use Scenario: Clamping VBUS line against surge events in USB-C receptacles of portable docking stations. IC Role / Device Role / Timing Role: Fast-acting shunt protector diverting >16 kV HBM transients before downstream PMIC damage. Use Value: Leverages Class 3 ESD rating and 500 mW surge capability to absorb repetitive 100 ns pulses without degradation. |
Use Scenario: Enabling controlled power-up sequencing of RF SoCs and flash memory in battery-powered edge nodes. IC Role / Device Role / Timing Role: Voltage supervisor input reference that triggers reset when main rail drops below 19 V. Use Value: Uses tight 19.0–21.0 V Zener window to ensure deterministic reset timing across temperature and aging. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C20 | Same 20 V nominal, but SOT-23 package (larger footprint, higher RJA = 375°C/W), 60 Ω ZZT, 0.1 μA IR | Less suitable for ultra-dense layouts; lower ESD rating (8 kV HBM) | Select BZX84-C20 only if SOT-23 compatibility or legacy footprint reuse is required |
| MMBZ5242B | 20 V nominal in SOT-23, 500 mW rating, but ±5% tolerance only at IZ = 20 mA; ZZT = 23 Ω at 20 mA | Higher test current shifts operating point; not optimized for low-current reference use | Prefer MMBZ5242B only in high-current shunt applications where 20 mA bias is available |
Compared with BZX84-C20 and MMBZ5242B, the MMSZ20T1 offers superior board-area efficiency via SOD−123, tighter low-current regulation stability, and automotive-grade ESD robustness-making it optimal for compact, high-reliability voltage reference designs.
Availability
MMSZ20T1 is available at Aetrix Electronics and suitable for automotive sensor biasing, industrial ADC reference design, and USB-C overvoltage protection requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for MMSZ20T1 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 is a global semiconductor supplier delivering energy-efficient silicon solutions for automotive, industrial, cloud, and IoT applications, with emphasis on reliability and sustainability.
The MMSZ20T1 belongs to the MMSZxxxT1G Zener regulator series, engineered for high-density, AEC−Q101-compliant voltage reference and clamping in space- and reliability-constrained systems.
FAQ
What is the Zener voltage tolerance of the MMSZ20T1?
The MMSZ20T1 has a nominal Zener voltage of 20 V with a standard tolerance of ±5%, meaning its actual breakdown voltage falls between 19.0 V and 21.0 V when tested at IZT = 5 mA and TA = 25°C. This tolerance is confirmed in the Electrical Characteristics table on page 2 of the onsemi datasheet.
Is the MMSZ20T1 suitable for automotive applications?
Yes, the MMSZ20T1 is AEC−Q101 qualified and PPAP capable, making it suitable for automotive applications such as engine control unit sensor biasing and infotainment system power rail clamping. Its operating temperature range of −55°C to +150°C and 16 kV HBM ESD rating meet stringent automotive reliability requirements.
What is the maximum power dissipation for the MMSZ20T1 on an FR-5 board?
The MMSZ20T1 is rated for 500 mW total power dissipation on an FR−5 board at a lead temperature (TL) of 75°C. Above 75°C, it derates linearly at 6.7 mW/°C, as specified in the Maximum Ratings table of the onsemi datasheet.
Does the MMSZ20T1 have a Pb-free package?
Yes, the MMSZ20T1 is supplied in a Pb−free SOD−123 package compliant with RoHS directives. The "G" suffix in the full part number MMSZ20T1G explicitly denotes the Pb−free construction, and the device meets onsemi's Pb−free strategy as documented in SOLDERRM/D.
How is polarity indicated on the MMSZ20T1 package?
Polarity on the MMSZ20T1 is indicated by a cathode band at Pin 1, located at the banded end of the SOD−123 case. Pin 2 is the anode. This marking aligns with the mechanical outline diagram on page 6 of the onsemi datasheet and must be observed to ensure correct reverse-bias orientation during Zener operation.
MMSZ20T1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- SOD-123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 20 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 55 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 14 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
MMSZ20T1 FAQ
1.How can I place an order for MMSZ20T1 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMSZ20T1 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 MMSZ20T1 reliable?
The price and inventory of MMSZ20T1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMSZ20T1 is usually 5 days.
3.What payment methods are accepted for MMSZ20T1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ20T1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMSZ20T1?
MMSZ20T1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMSZ20T1 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 MMSZ20T1?
For technical support, including MMSZ20T1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ20T1 requirements.
6.How does Aetrix verify that MMSZ20T1 is sourced from the original manufacturer or authorized distributors?
All MMSZ20T1 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 MMSZ20T1 meets industry standards.
7.What is the process for return or replacement of MMSZ20T1?
All MMSZ20T1 units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ20T1, 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 MMSZ20T1 part is unused and in its original packaging.
Return procedure for MMSZ20T1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MMSZ20T1 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…
