My Inquiry
My Account
onsemi SZMMSZ43T1G
- Part No.:
- SZMMSZ43T1G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
SZMMSZ43T1G.pdf
- Description:
- DIODE ZENER 43V 500MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:7,285
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SZMMSZ43T1G from onsemi is a 43 V ±5% Zener voltage regulator diode in SOD−123 package, rated for 500 mW power dissipation at 75°C, with 150 Ω dynamic impedance at 2 mA test current and 0.05 μA reverse leakage at 30.1 V, used for precision voltage reference and overvoltage protection in automotive power rails.
For engineers reviewing the SZMMSZ43T1G datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance (±5%), thermal resistance (340°C/W), AEC−Q101 qualification, ESD rating (>16 kV HBM), and SOD−123 board assembly compatibility.
Technical Context
This device operates as a two-terminal shunt voltage regulator, maintaining stable output voltage across variable load currents by conducting reverse breakdown current above its specified Zener voltage. It exhibits a nominal temperature coefficient of +12 mV/°C near 43 V, requiring thermal derating above 75°C ambient per its 6.7 mW/°C derating curve.
Designed for surface-mount automated assembly, the SZMMSZ43T1G features a Pb−Free SOD−123 case with UL 94 V−0 flammability rating, cathode polarity band marking, and maximum soldering temperature of 260°C for 10 seconds - meeting automotive-grade reliability requirements under AEC−Q101.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 40.85 V min / 43 V nom / 45.15 V max at IZT = 2 mA - defines regulated voltage range with ±5% tolerance |
| Zener Impedance (ZZT) | 150 Ω max at IZT = 2 mA - determines regulation accuracy under varying load current |
| Reverse Leakage (IR) | 0.05 μA max at VR = 30.1 V - ensures minimal standby power loss in high-impedance bias networks |
| Power Dissipation (PD) | 500 mW on FR−5 board at TL = 75°C - sets maximum continuous power handling before thermal shutdown |
| Thermal Resistance (RJA) | 340°C/W - dictates junction-to-ambient temperature rise per watt, critical for PCB copper area design |
| ESD Rating | Class 3 (>16 kV) per Human Body Model - enables robust handling in automotive manufacturing environments |
| AEC−Q101 Qualified | Yes - confirms suitability for automotive electronic control units without additional qualification testing |
Pinout & Package
SOD−123 surface-mount plastic package (1.60 × 2.69 × 1.16 mm), void-free thermosetting case, corrosion-resistant finish, cathode indicated by polarity band.
| 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 ground or low-impedance return path; completes shunt regulation loop |
Key Features
| Feature | Design Value |
|---|---|
| Automotive-Qualified Construction | AEC−Q101 qualified with PPAP capability - eliminates requalification effort for Tier 1 automotive designs |
| High-Density Packaging | SOD−123 footprint (1.60 × 2.69 mm) - enables compact voltage reference placement in space-constrained ECUs |
| Robust ESD Protection | Class 3 HBM (>16 kV) - prevents field failure during handling and assembly in unshielded production lines |
| Pb−Free Compliance | RoHS-compliant "G" suffix package - meets global environmental regulations without performance trade-offs |
| Controlled Thermal Performance | 340°C/W RJA with defined FR−5 board layout - enables predictable thermal margin calculation in automotive under-hood environments |
Applications
| Automotive Engine Control Unit (ECU) Reference | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Providing stable 43 V reference for analog-to-digital converter biasing in engine management systems operating at −40°C to +125°C. IC Role / Device Role / Timing Role: Shunt voltage reference regulating supply rail for precision ADC front-end circuitry. Use Value: ±5% VZ tolerance and AEC−Q101 qualification ensure long-term stability and compliance in safety-critical engine control applications. | Use Scenario: Clamping transient overvoltage on 36 V industrial sensor bus lines exposed to inductive switching noise. IC Role / Device Role / Timing Role: Overvoltage protection element diverting surge energy to ground during EFT events. Use Value: 150 Ω ZZT and 500 mW PD enable reliable clamping without thermal runaway under repetitive 1 ms surges. |
| Telecom Power Supply Monitoring | Medical Diagnostic Equipment Biasing |
Use Scenario: Monitoring 48 V telecom rectifier output via resistive divider into supervisor IC, requiring precise threshold detection. IC Role / Device Role / Timing Role: Precision voltage threshold reference for power-good signaling. Use Value: Low 0.05 μA leakage at 30.1 V ensures minimal divider current error, preserving accuracy of ±0.5% monitoring circuits. | Use Scenario: Generating stable bias voltage for photodiode amplifier stages in portable ultrasound imaging devices. IC Role / Device Role / Timing Role: Low-noise DC reference source for analog signal chain biasing. Use Value: 12 mV/°C temperature coefficient and 340°C/W thermal resistance allow predictable drift compensation in battery-powered handheld units. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMSZ43T1G | No SZ prefix; commercial grade (non-AEC−Q101); identical electrical specs and SOD−123 package | Not qualified for automotive use; suitable for industrial or consumer applications where AEC−Q101 is not mandated | Select when cost sensitivity outweighs automotive qualification requirement |
| SZMMBZ5263BLT1G | 43 V Zener, SOT−23 package, 350 mW rating, higher ZZT (250 Ω), different thermal resistance (400°C/W) | Smaller footprint but lower power handling; less suitable for sustained 500 mW dissipation scenarios | Select when board space is constrained and peak power remains below 350 mW |
Compared with MMSZ43T1G and SZMMBZ5263BLT1G, the SZMMSZ43T1G uniquely combines AEC−Q101 qualification, 500 mW power rating, and SOD−123 manufacturability - making it the only choice for automotive applications demanding both reliability and thermal headroom.
Availability
SZMMSZ43T1G is available at Aetrix Electronics and suitable for automotive engine control units, industrial sensor interfaces, and telecom power monitoring systems requiring stable component supply with full traceability and lifecycle support.
Supply support for SZMMSZ43T1G 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 manufacturer specializing in energy-efficient silicon solutions for automotive, industrial, cloud, and IoT applications.
The MMSZ/SZMMSZ series targets high-reliability voltage regulation in space-constrained, thermally demanding environments - particularly automotive power management and industrial sensing subsystems.
FAQ
What is the Zener voltage tolerance of SZMMSZ43T1G?
The SZMMSZ43T1G has a nominal Zener voltage of 43 V with a standard tolerance of ±5%, resulting in a guaranteed range of 40.85 V to 45.15 V at 2 mA test current. This tolerance is measured under pulsed conditions (PW = 1 ms) and applies across the full operating temperature range of −55°C to +150°C. The SZMMSZ43T1G datasheet specifies this value in the Electrical Characteristics table on page 3.
Is SZMMSZ43T1G suitable for automotive applications?
Yes, SZMMSZ43T1G is AEC−Q101 qualified and PPAP capable, explicitly designed for automotive and other applications requiring unique site and control change tracking. Its SOD−123 package, Pb−Free construction, and Class 3 ESD rating (>16 kV HBM) meet stringent automotive manufacturing and field reliability requirements. The SZMMSZ43T1G is commonly deployed in engine control units and body electronics modules.
What is the maximum power dissipation for SZMMSZ43T1G?
The SZMMSZ43T1G is rated for 500 mW total power dissipation on FR−5 board at lead temperature (TL) = 75°C, with linear derating of 6.7 mW/°C above that temperature. Its thermal resistance junction-to-ambient is 340°C/W, meaning a 1 W power input would raise junction temperature by 340°C above ambient - underscoring the need for proper PCB copper area and airflow. This rating is confirmed in the Maximum Ratings table on page 1 of the SZMMSZ43T1G datasheet.
How does the temperature coefficient affect SZMMSZ43T1G performance?
The SZMMSZ43T1G exhibits a positive temperature coefficient of approximately +12 mV/°C near its 43 V operating point, as shown in Figure 1 of the datasheet. This means its Zener voltage increases by ~12 mV per degree Celsius rise in junction temperature. For applications requiring tight regulation across wide temperature ranges, this drift must be compensated in system-level calibration - especially critical in automotive under-hood environments where ambient can reach +125°C.
What packaging options are available for SZMMSZ43T1G?
SZMMSZ43T1G is supplied in Pb−Free SOD−123 package (Case 425, Style 1) on 3,000-unit tape-and-reel format. The marking code "Z1" appears on the cathode-banded end, followed by a date code. No alternate packages (e.g., SOT−23 or DO−35) are offered for this specific part number - the SOD−123 variant is the only configuration listed in the official onsemi ordering information table for SZMMSZ43T1G.
SZMMSZ43T1G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- SOD-123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 43 V
- Tolerance:
- ±5%
- 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:
- -55°C ~ 150°C
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-123
SZMMSZ43T1G FAQ
1.How can I place an order for SZMMSZ43T1G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZMMSZ43T1G 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 SZMMSZ43T1G reliable?
The price and inventory of SZMMSZ43T1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZMMSZ43T1G is usually 5 days.
3.What payment methods are accepted for SZMMSZ43T1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZMMSZ43T1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZMMSZ43T1G?
SZMMSZ43T1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZMMSZ43T1G 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 SZMMSZ43T1G?
For technical support, including SZMMSZ43T1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZMMSZ43T1G requirements.
6.How does Aetrix verify that SZMMSZ43T1G is sourced from the original manufacturer or authorized distributors?
All SZMMSZ43T1G 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 SZMMSZ43T1G meets industry standards.
7.What is the process for return or replacement of SZMMSZ43T1G?
All SZMMSZ43T1G units undergo pre-shipment inspection (PSI). If there is an issue with SZMMSZ43T1G, 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 SZMMSZ43T1G part is unused and in its original packaging.
Return procedure for SZMMSZ43T1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SZMMSZ43T1G 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…
