My Inquiry
My Account
onsemi SZMM3Z43VT1G
- Part No.:
- SZMM3Z43VT1G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
SZMM3Z43VT1G.pdf
- Description:
- DIODE ZENER 43V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:3,149
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SZMM3Z43VT1G from onsemi is a 43 V, 300 mW Zener voltage regulator diode in SOD−323 package, designed for precision voltage reference and overvoltage protection in space-constrained circuits. It delivers ±7% nominal Zener voltage tolerance (40–46 V), 150 Ω dynamic impedance at 2 mA test current, and <0.05 µA leakage at 30.1 V reverse bias - enabling stable regulation in portable power rails and I/O clamping.
For engineers reviewing the SZMM3Z43VT1G datasheet, pinout, applications, or equivalent options, key selection criteria include its AEC−Q101 qualification, 16 kV HBM ESD rating, low 0.9 mm profile, and automotive-grade traceability - critical for battery management, sensor interface, and USB-C port protection designs.
Technical Context
This device operates as a two-terminal, cathode-anode polarized silicon Zener diode optimized for stable reverse-breakdown regulation. Its 43 V nominal Zener voltage is specified at 2 mA test current (IZT), with dynamic impedance (ZZT) of 150 Ω and knee impedance (ZZK) of 500 Ω at 0.5 mA, ensuring predictable clamping behavior across load transients.
Thermally, it features a junction-to-ambient thermal resistance of 416°C/W on FR-4 board, derating linearly at 2.4 mW/°C above 25°C ambient, and supports storage and operation from −65°C to +150°C - making it suitable for under-hood automotive modules and industrial edge sensors where thermal margin is constrained.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 40–46 V @ IZT = 2 mA - defines clamping threshold for overvoltage protection in 3.3 V/5 V/12 V rail monitoring |
| Power Dissipation | 300 mW @ TA = 25°C - sets maximum continuous power handling on standard PCB layout |
| Zener Impedance (ZZT) | 150 Ω @ IZT = 2 mA - determines regulation accuracy under varying load current |
| Leakage Current (IR) | <0.05 µA @ VR = 30.1 V - ensures minimal standby current draw in always-on circuits |
| ESD Rating | Class 3 (>16 kV) HBM - provides robust electrostatic immunity for handheld and connector-facing applications |
| Package | SOD−323 (Case 477) - 1.7 × 1.25 × 0.9 mm footprint enables high-density placement on compact PCBs |
| Temperature Coefficient | +0.0376 %/°C - quantifies VZ drift with temperature, critical for precision reference stability |
Pinout & Package
SOD−323 surface-mount package with cathode indicated by polarity band; body dimensions 1.7 mm × 1.25 mm × 0.9 mm; mounting position unrestricted; Pb-free plating (Sn only).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Banded End) | Cathode | Connected to regulated output or higher-potential node; reverse-biased during Zener operation |
| 2 (Non-banded End) | Anode | Connected to ground or lower-potential reference; completes current path during clamping |
Key Features
| Feature | Design Value |
|---|---|
| AEC−Q101 Qualified | Validated for automotive applications including engine control units and ADAS sensor interfaces |
| Low Profile Height | 0.9 mm max - enables stacking under shields or placement near tall components like connectors |
| High ESD Robustness | 16 kV Human Body Model - eliminates need for external TVS in many USB, GPIO, and button-input circuits |
| Pb-Free Construction | RoHS-compliant Sn-only termination - supports lead-free reflow profiles without solder joint reliability risk |
| Stable Low-Leakage Performance | <0.05 µA at 30.1 V - preserves battery life in always-on IoT nodes and wearables |
Applications
| Automotive Sensor Interface | USB-C Port Protection |
|---|---|
Use Scenario: Voltage clamping for analog outputs of pressure/temperature sensors in engine bay modules. IC Role / Device Role / Timing Role: Zener diode providing bidirectional overvoltage protection on sensor signal lines referenced to 5 V supply. Use Value: Prevents damage from load-dump transients up to 46 V while maintaining sub-0.05 µA leakage to avoid signal offset errors. | Use Scenario: Reverse-polarity and overvoltage protection on CC (Configuration Channel) pins of USB-C receptacles. IC Role / Device Role / Timing Role: Standoff diode limiting CC line voltage to safe levels during hot-plug events or adapter misinsertion. Use Value: Leverages 16 kV HBM ESD rating and 43 V Zener clamp to meet USB-IF compliance without adding discrete TVS arrays. |
| Portable Medical Device Power Rail | Industrial PLC Analog Input Protection |
Use Scenario: Regulation and transient suppression on 3.3 V LDO output feeding ADC reference and microcontroller core logic. IC Role / Device Role / Timing Role: Precision shunt reference stabilizing local VREF and absorbing surge energy from ESD events. Use Value: 150 Ω ZZT ensures <±10 mV regulation error across 0.5–2 mA load variation, critical for 12-bit medical data acquisition. | Use Scenario: Input protection for 0–10 V analog inputs in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: Front-end Zener clamp limiting input voltage to prevent op-amp saturation and ADC overrange. Use Value: 43 V breakdown withstands common-mode surges per IEC 61000-4-5 Level 3 while occupying <2 mm² PCB area per channel. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX384-B43,115 | 43 V ±5%, 300 mW, SOD-323, but rated only to +150°C (no AEC-Q101) | Lacks automotive qualification and has higher leakage (0.1 µA @ 34.4 V) | Preferred for cost-sensitive consumer electronics where AEC-Q101 is not required |
| MMSZ43ET1G | 43 V ±5%, 500 mW, SOD-123, larger footprint (3.7 × 1.6 mm), same ESD rating | Higher power handling but incompatible PCB layout due to different package and pin spacing | Chosen when thermal margin exceeds 300 mW or legacy SOD-123 footprints are fixed |
Compared with BZX384-B43,115 and MMSZ43ET1G, SZMM3Z43VT1G uniquely combines AEC-Q101 qualification, ultra-low leakage, and minimal 1.7 × 1.25 mm footprint - making it the optimal choice for next-generation automotive and space-constrained industrial designs requiring guaranteed reliability and density.
Availability
SZMM3Z43VT1G is available at Aetrix Electronics and suitable for automotive sensor interfaces, USB-C port protection, and portable medical device power rails requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SZMM3Z43VT1G 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 (Nasdaq: ON) is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
SZMM3Z43VT1G belongs to the MM3ZxxxT1G/SZMM3ZxxxT1G series - engineered specifically for high-reliability voltage regulation in miniaturized, thermally constrained environments where AEC-Q101 compliance and ultra-low leakage are mandatory.
FAQ
What is the Zener voltage tolerance of SZMM3Z43VT1G?
The SZMM3Z43VT1G has a nominal Zener voltage of 43 V with a tolerance range of 40 V to 46 V (±7%) at IZT = 2 mA and TA = 25°C. This tolerance is confirmed in the Electrical Characteristics table on page 2 of the official datasheet. The device marking "21" corresponds to this 43 V variant, and the specification applies strictly under the stated test conditions.
Is SZMM3Z43VT1G suitable for automotive applications?
Yes, SZMM3Z43VT1G is AEC−Q101 qualified and PPAP capable, with an SZ prefix indicating compliance for automotive and other high-reliability applications. It operates across −65°C to +150°C, supports 16 kV HBM ESD, and is manufactured under controlled site and change management - fulfilling requirements for engine control, ADAS, and body electronics per onsemi's automotive qualification protocol.
What is the maximum steady-state power dissipation for SZMM3Z43VT1G?
The maximum steady-state power dissipation for SZMM3Z43VT1G is 300 mW at TA = 25°C on an FR-4 board with a 1 cm² copper pad. Above 25°C, it derates linearly at 2.4 mW/°C, reaching zero dissipation at approximately 150°C ambient. This rating is defined in the Maximum Ratings table and validated per JEDEC JESD51-3 thermal test conditions.
Does SZMM3Z43VT1G have a Pb-free finish?
Yes, SZMM3Z43VT1G uses a Pb-free Sn-only plating on its leads, as explicitly stated in the Mechanical Characteristics section and ordering information. It complies with RoHS Directive 2011/65/EU and meets onsemi's Pb-free strategy, supporting lead-free reflow soldering profiles up to 260°C for 10 seconds without degradation.
How is polarity identified on the SZMM3Z43VT1G package?
Polarity on the SZMM3Z43VT1G is indicated by a cathode band located at terminal 1 (banded end) of the SOD−323 package. This matches the pin diagram in the datasheet's Device Marking Information section and is consistent across all MM3ZxxxT1G and SZMM3ZxxxT1G devices. Correct orientation is essential for proper reverse-bias operation during Zener regulation.
SZMM3Z43VT1G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- SC-76, SOD-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 43 V
- Tolerance:
- ±7%
- Power - Max:
- 300 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
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-323
SZMM3Z43VT1G FAQ
1.How can I place an order for SZMM3Z43VT1G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZMM3Z43VT1G 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 SZMM3Z43VT1G reliable?
The price and inventory of SZMM3Z43VT1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZMM3Z43VT1G is usually 5 days.
3.What payment methods are accepted for SZMM3Z43VT1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZMM3Z43VT1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZMM3Z43VT1G?
SZMM3Z43VT1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZMM3Z43VT1G 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 SZMM3Z43VT1G?
For technical support, including SZMM3Z43VT1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZMM3Z43VT1G requirements.
6.How does Aetrix verify that SZMM3Z43VT1G is sourced from the original manufacturer or authorized distributors?
All SZMM3Z43VT1G 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 SZMM3Z43VT1G meets industry standards.
7.What is the process for return or replacement of SZMM3Z43VT1G?
All SZMM3Z43VT1G units undergo pre-shipment inspection (PSI). If there is an issue with SZMM3Z43VT1G, 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 SZMM3Z43VT1G part is unused and in its original packaging.
Return procedure for SZMM3Z43VT1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SZMM3Z43VT1G 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…
