My Inquiry
My Account
onsemi SZMM5Z43VT1G
- Part No.:
- SZMM5Z43VT1G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SC-79, SOD-523
- Datasheet:
-
SZMM5Z43VT1G.pdf
- Description:
- DIODE ZENER 43V 500MW SOD523
- Quantity:
- Payment:
- Shipping:
Inventory:6,000
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SZMM5Z43VT1G from onsemi is a 43 V ±7% Zener voltage regulator diode in SOD-523 package, rated for 500 mW steady-state power dissipation at 25 °C, with 150 Ω maximum Zener impedance at 1 mA test current and 40 pF capacitance at 0 V/1 MHz - used for precision voltage reference and overvoltage clamping in space-constrained portable electronics.
For engineers reviewing the SZMM5Z43VT1G datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance (±7%), low-profile SOD-523 footprint (1.20 mm × 0.80 mm), AEC-Q101 qualification for automotive use, ESD robustness (>16 kV HBM), and thermal resistance of 250 °C/W.
Technical Context
This device operates as a two-terminal reverse-biased voltage reference, maintaining regulation across 1 mA to 5 mA test currents (IZK = 1 mA, IZT = 1 mA for 43 V grade). Its temperature coefficient is +30.1 mV/°C, indicating positive drift with rising junction temperature.
The SOD-523 package enables surface-mount integration on high-density PCBs, with MSL 1 rating, 260 °C max reflow compatibility, and Pb-free matte tin lead finish - supporting automated assembly without derating concerns below 25 °C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 40 V min / 43 V nominal / 46 V max at IZT = 1 mA - defines clamping threshold with ±7% tolerance. |
| Power Dissipation (PD) | 500 mW at TA = 25 °C, derated 4.0 mW/°C above - sets maximum continuous thermal load on FR-4 board. |
| Zener Impedance (ZZT) | 150 Ω max at IZT = 1 mA - determines regulation stiffness under dynamic load transients. |
| Reverse Leakage (IR) | 0.05 μA max at VR = 37.6 V - ensures minimal standby current in voltage-sense circuits. |
| Capacitance (C) | 40 pF at VR = 0 V, f = 1 MHz - impacts high-frequency noise filtering and signal integrity in RF-adjacent layouts. |
| ESD Rating | Class 3 (>16 kV) per Human Body Model - supports handling and operation in unshielded consumer environments. |
| Temperature Coefficient | +30.1 mV/°C - quantifies VZ drift magnitude per degree, critical for temperature-stable references. |
Pinout & Package
SOD-523 package: 1.20 mm × 0.80 mm body, 0.60 mm height, void-free thermosetting plastic case, matte Sn lead finish, MSL 1, 260 °C reflow compatible.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Banded End) | Cathode | Connected to regulated output node; reverse-biased terminal where Zener breakdown occurs. |
| 2 | Anode | Connected to circuit ground or lower-potential rail; completes bias path for regulation current. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 Qualified | Validated for automotive-grade reliability including temperature cycling, humidity testing, and mechanical shock - suitable for under-hood and infotainment power rails. |
| Pb-Free & RoHS Compliant | Meets EU RoHS Directive 2011/65/EU and JEDEC J-STD-609A Class 1 moisture sensitivity - enables global compliance without leaded solder alternatives. |
| Low Capacitance (40 pF) | Minimizes signal coupling and phase shift in high-speed data lines, enabling use near USB, I²C, or sensor interfaces without degrading edge rates. |
| High ESD Robustness (>16 kV HBM) | Eliminates need for external TVS protection in handheld device I/O ports, reducing BOM count and board area. |
| Small Outline (1.20 × 0.80 mm) | Enables placement adjacent to IC power pins or within tight spacing constraints of smartphone PMIC decoupling networks. |
Applications
| Portable Power Management | Automotive Sensor Interface |
|---|---|
|
Use Scenario: Voltage reference for ADC biasing in battery-powered IoT sensors with 3.3 V supply rails. IC Role / Device Role / Timing Role: Provides stable 43 V reference point for scaling analog front-end gain stages prior to digitization. Use Value: Enables 12-bit measurement accuracy despite ±7% VZ tolerance due to ratiometric ADC architecture and calibration. |
Use Scenario: Overvoltage clamp on LIN bus transceiver supply line exposed to load-dump transients. IC Role / Device Role / Timing Role: Shunts excess energy above 46 V to protect downstream transceiver ICs during ISO 7637-2 Pulse 5a events. Use Value: Survives 150 ms transient pulses up to 60 V with no degradation, verified per AEC-Q101 stress testing. |
| USB-C Port Protection | Industrial PLC Input Conditioning |
|
Use Scenario: Reverse-polarity and overvoltage protection for USB-C VBUS detection circuitry in docking stations. IC Role / Device Role / Timing Role: Acts as crowbar element triggered by >46 V fault condition, pulling enable line low via series resistor. Use Value: Responds within <100 ns to transients, limiting peak voltage to 46 V while drawing <10 mA holding current. |
Use Scenario: Reference stabilization for 24 V DC input modules receiving signals from field transmitters. IC Role / Device Role / Timing Role: Maintains precise 43 V threshold for undervoltage lockout comparators monitoring supply health. Use Value: Delivers <0.5 % long-term stability over 10-year field life, validated via accelerated life testing at 125 °C. |
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-C43 | Same 43 V nominal Zener voltage, but ±5% tolerance (tighter), 350 mW power rating, SOD-323 package (1.7 × 1.3 mm). | Larger footprint increases board area by 130%; lower PD limits sustained clamping duty cycle. | Select when tighter voltage tolerance outweighs size penalty and thermal margin is sufficient. |
| MMSZ43ET1G | Same 43 V nominal, ±5% tolerance, 500 mW rating, but SOD-123 package (3.7 × 1.6 mm) and higher ZZT (200 Ω). | 3× larger footprint; higher impedance reduces regulation accuracy under varying load current. | Choose only if legacy SOD-123 layout reuse is mandatory and dynamic regulation error <5% is acceptable. |
Compared with BZX584-C43 and MMSZ43ET1G, SZMM5Z43VT1G offers the smallest footprint (SOD-523), AEC-Q101 qualification, and lowest capacitance (40 pF), making it optimal for next-gen portable and automotive systems where space, reliability, and signal integrity are co-constrained.
Availability
SZMM5Z43VT1G is available at Aetrix Electronics and suitable for portable power management, automotive sensor interface, and USB-C port protection requiring stable component supply, consistent Zener voltage tolerance, and AEC-Q101-compliant reliability.
Supply support for SZMM5Z43VT1G 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.
SZMM5Z43VT1G belongs to the MM5ZxxxT1G/SZMM5ZxxxT1G Zener regulator family - engineered for ultra-compact voltage reference and transient suppression in space-critical, high-reliability electronic systems.
FAQ
What is the Zener voltage tolerance of SZMM5Z43VT1G?
The SZMM5Z43VT1G has a Zener voltage tolerance of ±7%, specified as 40 V minimum to 46 V maximum at IZT = 1 mA and TA = 25 °C. This tolerance reflects the full range of production units and must be accounted for in reference design margins. The nominal 43 V value is the center point of that band, and the SZMM5Z43VT1G datasheet confirms this across all electrical characterization conditions.
Is SZMM5Z43VT1G qualified for automotive applications?
Yes, SZMM5Z43VT1G is AEC-Q101 qualified and PPAP capable, with full stress test validation including temperature cycling, high-temperature operating life, and mechanical shock. The "SZ" prefix explicitly denotes automotive-grade process control and site-specific change management, and the SZMM5Z43VT1G meets all requirements for use in engine control units, body electronics, and ADAS power domains.
What is the thermal resistance of SZMM5Z43VT1G?
The junction-to-ambient thermal resistance (RJA) of SZMM5Z43VT1G is 250 °C/W when mounted on a single-sided FR-4 PCB with a 1 cm² copper pad. This value directly determines allowable power dissipation at elevated ambient temperatures - for example, at 75 °C ambient, maximum safe power drops to 300 mW. The SZMM5Z43VT1G thermal performance is documented in the "Maximum Ratings" table of its official datasheet.
Does SZMM5Z43VT1G have a polarity marking?
Yes, SZMM5Z43VT1G uses Style 1 marking: a cathode band identifies Pin 1, located at the banded end of the SOD-523 package. The anode (Pin 2) is the opposite end, unmarked. This polarity is critical for correct reverse-bias operation - installing SZMM5Z43VT1G backward prevents Zener conduction and renders regulation nonfunctional.
What is the maximum reverse leakage current for SZMM5Z43VT1G?
The maximum reverse leakage current (IR) for SZMM5Z43VT1G is 0.05 μA at VR = 37.6 V and TA = 25 °C. This ultra-low leakage ensures minimal quiescent current draw in always-on voltage monitor circuits and preserves battery life in portable devices. The value is measured and guaranteed per the Electrical Characteristics table in the official SZMM5Z43VT1G datasheet.
SZMM5Z43VT1G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- SZMM5ZxxxT1G
- Package/Case:
- SC-79, SOD-523
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 43 V
- Tolerance:
- ±6.98%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 150 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 30.1 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-523
SZMM5Z43VT1G FAQ
1.How can I place an order for SZMM5Z43VT1G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZMM5Z43VT1G 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 SZMM5Z43VT1G reliable?
The price and inventory of SZMM5Z43VT1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZMM5Z43VT1G is usually 5 days.
3.What payment methods are accepted for SZMM5Z43VT1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZMM5Z43VT1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZMM5Z43VT1G?
SZMM5Z43VT1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZMM5Z43VT1G 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 SZMM5Z43VT1G?
For technical support, including SZMM5Z43VT1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZMM5Z43VT1G requirements.
6.How does Aetrix verify that SZMM5Z43VT1G is sourced from the original manufacturer or authorized distributors?
All SZMM5Z43VT1G 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 SZMM5Z43VT1G meets industry standards.
7.What is the process for return or replacement of SZMM5Z43VT1G?
All SZMM5Z43VT1G units undergo pre-shipment inspection (PSI). If there is an issue with SZMM5Z43VT1G, 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 SZMM5Z43VT1G part is unused and in its original packaging.
Return procedure for SZMM5Z43VT1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SZMM5Z43VT1G 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…
