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onsemi SZMMSZ4709T1G
- Part No.:
- SZMMSZ4709T1G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
SZMMSZ4709T1G.pdf
- Description:
- DIODE ZENER 24V 500MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:14,598
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Product details
Overview
SZMMSZ4709T1G from onsemi is a 24 V nominal Zener voltage regulator diode in SOD−123 package, rated for 500 mW power dissipation at 75°C, with 50 µA test current (IZT), 0.01 µA reverse leakage at 18.2 V, and ±5% Zener voltage tolerance. It serves as a precision voltage reference or overvoltage clamp in automotive body control modules.
For engineers reviewing the SZMMSZ4709T1G datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage accuracy at IZT = 50 µA, low leakage at VR = 18.2 V, thermal derating above 75°C, and AEC−Q101 qualification for automotive use.
Technical Context
This device operates as a two-terminal, silicon planar Zener diode optimized for stable reverse-biased regulation. Its junction temperature range spans −55°C to +150°C, and it exhibits a typical dynamic impedance (ZZT) of 100 Ω at 20 mA DC bias with 1 kHz AC signal.
The SOD−123 package enables automated placement and provides Class 3 ESD protection (>16 kV HBM). Thermal resistance is 340°C/W junction-to-ambient and 150°C/W junction-to-lead, supporting reliable operation under pulsed surge conditions up to 1 W for 1 ms rectangular waveforms.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 22.8 V min / 24 V nom / 25.2 V max @ IZT = 50 µA - defines regulation band for precision clamping |
| Power Dissipation (PD) | 500 mW @ TL = 75°C - sets maximum continuous thermal load on FR−5 board |
| Reverse Leakage (IR) | 0.01 µA @ VR = 18.2 V - ensures minimal standby current in high-impedance sensing circuits |
| Dynamic Impedance (ZZT) | 100 Ω @ IZ = 20 mA - determines output voltage stability under varying load current |
| Temperature Range | −55°C to +150°C - supports operation in engine bay and powertrain control units |
| ESD Rating | Class 3 (>16 kV HBM) - protects against handling-induced electrostatic discharge during assembly |
Pinout & Package
SOD−123 surface-mount plastic package (1.60 × 2.69 × 1.16 mm), void-free thermosetting case with cathode polarity band. Maximum soldering temperature: 260°C for 10 seconds. Flammability rating: UL 94 V−0.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Banded End) | Cathode | Connected to regulated voltage node; reverse-biased terminal during Zener operation |
| 2 (Non-banded End) | Anode | Connected to ground or lower-potential reference; completes current path during regulation |
Key Features
| Feature | Design Value |
|---|---|
| AEC−Q101 qualified | Validated for automotive applications including body electronics and power distribution systems |
| Pb−Free and RoHS compliant | Meets global environmental compliance requirements without lead-based solder compatibility compromises |
| Low IZT = 50 µA | Enables stable regulation in ultra-low-power sensor biasing and microcontroller reset circuits |
| Small SOD−123 footprint | Supports high-density PCB layouts in space-constrained automotive ECUs and ADAS modules |
| Wide operating temperature range | Ensures functional reliability across cold-cranking (−40°C) and under-hood hot-soak (+125°C ambient) conditions |
Applications
| Automotive Body Control Module | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Voltage reference for LIN bus transceiver biasing and door module microcontroller reset circuitry. IC Role / Device Role / Timing Role: Zener diode providing stable 24 V reference for analog front-end comparators and POR logic. Use Value: Maintains <±5% regulation accuracy across −40°C to +105°C ambient, enabling robust cold-start operation. |
Use Scenario: Overvoltage clamp protecting 24 V industrial analog input channels from transient surges. IC Role / Device Role / Timing Role: Two-terminal shunt regulator absorbing energy during 100 V/1 ms surge events per IEC 61000-4-5. Use Value: Limits clamped voltage to ≤25.2 V while dissipating up to 500 mW, preventing downstream ADC damage. |
| Automotive Lighting Control Unit | Medical Diagnostic Power Supply Monitoring |
Use Scenario: Reference voltage source for LED driver current-sense amplifier feedback loop. IC Role / Device Role / Timing Role: Precision Zener establishing 24 V rail monitor threshold for open-load detection. Use Value: Low 0.01 µA leakage at 18.2 V ensures negligible error contribution in µA-level sense current paths. |
Use Scenario: Secondary overvoltage protection in isolated 24 V auxiliary supply for patient-connected monitoring equipment. IC Role / Device Role / Timing Role: Fail-safe shunt element triggering crowbar circuit when main regulator fails. Use Value: AEC−Q101 qualification and 150°C TJ rating support safety-critical redundancy in Class II medical devices. |
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-C24LT1G | 24 V nominal, 300 mW rating, SOT−23 package, IZT = 5 mA - higher test current, lower power, smaller thermal mass | Preferred for portable battery-powered sensors where board space is critical but power dissipation is low | Select when thermal budget is constrained and 5 mA IZT is acceptable for reference stability |
| MMSZ4709T1G | Same Zener voltage range (22.8–25.2 V), identical SOD−123 package, but not AEC−Q101 qualified or automotive-marked | Suitable for industrial and consumer applications requiring same electrical specs without automotive traceability | Choose for cost-sensitive non-automotive designs where PPAP documentation and site control are unnecessary |
Compared with BZX84-C24LT1G, SZMMSZ4709T1G delivers higher power handling and automotive qualification but requires larger PCB area; compared with MMSZ4709T1G, it adds AEC−Q101 validation and controlled manufacturing for mission-critical vehicle systems.
Availability
SZMMSZ4709T1G is available at Aetrix Electronics and suitable for automotive body control modules, industrial sensor interfaces, and medical diagnostic power monitoring requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SZMMSZ4709T1G 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, and IoT applications.
The SZMMSZ4xxxT1G series is part of onsemi's automotive-qualified Zener regulator portfolio, designed specifically for voltage reference, overvoltage protection, and biasing in harsh-environment electronic control units.
FAQ
What is the Zener voltage tolerance of SZMMSZ4709T1G?
The SZMMSZ4709T1G has a nominal Zener voltage of 24 V with a tolerance of ±5%, meaning the actual measured VZ falls between 22.8 V and 25.2 V when tested at IZT = 50 µA and TA = 25°C. This tolerance remains valid across the full operating temperature range of −55°C to +150°C, as confirmed in the onsemi datasheet revision 13.
Is SZMMSZ4709T1G suitable for automotive applications?
Yes, SZMMSZ4709T1G is AEC−Q101 qualified and PPAP capable, with an SZ prefix indicating automotive-grade manufacturing controls, site-specific change management, and enhanced reliability testing. It is explicitly intended for use in automotive body electronics, lighting control, and power distribution systems per the onsemi datasheet.
What is the maximum power dissipation for SZMMSZ4709T1G on FR−5 board?
SZMMSZ4709T1G is rated for 500 mW total power dissipation on FR−5 board at a lead temperature (TL) of 75°C. Above 75°C, it derates linearly at 6.7 mW/°C, reaching zero dissipation at approximately 149°C TL. This rating assumes the minimum recommended footprint per onsemi's mechanical specifications.
How does the reverse leakage current of SZMMSZ4709T1G compare to similar Zeners?
SZMMSZ4709T1G specifies only 0.01 µA maximum reverse leakage current at VR = 18.2 V, which is significantly lower than many 24 V Zeners rated at 1–10 µA. This ultra-low IR supports high-impedance bias networks in precision analog circuits and extends battery life in always-on automotive subsystems.
What package type and dimensions does SZMMSZ4709T1G use?
SZMMSZ4709T1G uses the SOD−123 surface-mount package (case 425, style 1), measuring 1.60 mm × 2.69 mm × 1.16 mm. It features a cathode band marking, Pb−free construction, UL 94 V−0 flammability rating, and is qualified for reflow soldering at 260°C for 10 seconds.
SZMMSZ4709T1G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- SOD-123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 24 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- -
- Current - Reverse Leakage @ Vr:
- 10 nA @ 18.2 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
SZMMSZ4709T1G FAQ
1.How can I place an order for SZMMSZ4709T1G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZMMSZ4709T1G 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 SZMMSZ4709T1G reliable?
The price and inventory of SZMMSZ4709T1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZMMSZ4709T1G is usually 5 days.
3.What payment methods are accepted for SZMMSZ4709T1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZMMSZ4709T1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZMMSZ4709T1G?
SZMMSZ4709T1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZMMSZ4709T1G 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 SZMMSZ4709T1G?
For technical support, including SZMMSZ4709T1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZMMSZ4709T1G requirements.
6.How does Aetrix verify that SZMMSZ4709T1G is sourced from the original manufacturer or authorized distributors?
All SZMMSZ4709T1G 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 SZMMSZ4709T1G meets industry standards.
7.What is the process for return or replacement of SZMMSZ4709T1G?
All SZMMSZ4709T1G units undergo pre-shipment inspection (PSI). If there is an issue with SZMMSZ4709T1G, 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 SZMMSZ4709T1G part is unused and in its original packaging.
Return procedure for SZMMSZ4709T1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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