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onsemi MMSZ4709ET1
- Part No.:
- MMSZ4709ET1
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
MMSZ4709ET1.pdf
- Description:
- DIODE ZENER 24V 500MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:3,370
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Product details
Overview
MMSZ4709ET1 from ON Semiconductor is a 24 V nominal Zener voltage regulator diode in SOD−123 surface-mount package, rated for 500 mW power dissipation at 75°C on FR−5 board, with 225 W peak surge capability (8 × 20 µs), <18.2 V reverse leakage threshold at 18.2 V, and ±5% Zener voltage tolerance (22.8–25.2 V). It serves as a precision voltage reference or overvoltage clamp in low-power analog sensing circuits.
For engineers reviewing the MMSZ4709ET1 datasheet, pinout, applications, or equivalent options, this page delivers verified electrical specs, thermal derating behavior, cathode/anode terminal roles, automotive-grade AEC−Q101 qualification status, and direct alternatives with documented voltage and leakage differences.
Technical Context
This Zener diode operates in reverse breakdown to maintain stable voltage across its terminals under controlled current conditions. Its 24 V nominal Zener voltage is specified at IZT = 50 mA, with dynamic impedance ZZT ≤ 40 Ω at 1 mA AC signal superimposed on DC bias.
Thermal resistance junction-to-ambient is 340 °C/W, requiring careful PCB copper area design for sustained 500 mW operation. The device exhibits a positive temperature coefficient above ~5 V, with typical TC of +11.5 mV/°C near 24 V, confirmed in Figure 1 of the datasheet.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 22.8 V min / 24 V nom / 25.2 V max @ IZT = 50 mA - defines clamping threshold range for protection or reference use |
| Power Dissipation (PD) | 500 mW @ TL = 75°C - maximum continuous power on FR−5 board before thermal derating applies |
| Peak Surge Power (Ppk) | 225 W @ 8 × 20 µs pulse - supports transient overvoltage suppression without failure |
| Reverse Leakage (IR) | ≤ 0.01 µA @ VR = 18.2 V - ensures minimal quiescent current in high-impedance bias networks |
| Dynamic Impedance (ZZT) | ≤ 40 Ω @ IZ = 1 mA, f = 1 kHz - limits AC voltage variation during small-signal regulation |
| ESD Rating | Class 3 (>16 kV) HBM - withstands handling and assembly electrostatic discharge without parameter shift |
| AEC−Q101 Qualified | Yes - validated for automotive electronics applications per stress test requirements |
Pinout & Package
SOD−123 plastic surface-mount package (Case 425, Style 1), void-free thermosetting epoxy case with corrosion-resistant finish; cathode indicated by polarity band; maximum soldering temperature 260°C for 10 seconds.
| 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 lower-potential rail; completes conduction path during breakdown |
Key Features
| Feature | Design Value |
|---|---|
| 500 mW FR−5 board rating | Enables compact, high-density voltage reference design without forced cooling |
| Class 3 ESD immunity (>16 kV HBM) | Eliminates need for external ESD protection in board-level assembly and end-use environments |
| AEC−Q101 qualification | Supports deployment in automotive body control modules and infotainment power rails without requalification |
| Small SOD−123 footprint | Reduces PCB real estate by >60% vs. legacy DO−35 through-hole Zeners |
| Pb−Free packaging | Complies with RoHS Directive 2011/65/EU and JEDEC J-STD-020 moisture sensitivity level 1 |
Applications
| Automotive Sensor Reference | Industrial Analog Input Protection |
|---|---|
Use Scenario: Providing stable 24 V reference for Hall-effect position sensors in engine control units. IC Role / Device Role / Timing Role: Zener voltage reference diode establishing precise bias point for sensor signal conditioning amplifier. Use Value: Maintains reference accuracy within ±5% over −40°C to +125°C ambient, supporting AEC−Q100 Grade 2 compliance. |
Use Scenario: Clamping input transients on 24 V industrial PLC analog input channels exposed to field wiring surges. IC Role / Device Role / Timing Role: Overvoltage protection device shunting excess energy to ground during EFT or surge events. Use Value: Withstands 225 W non-repetitive surges (8 × 20 µs), preventing downstream ADC damage without crowbar action. |
| Low-Power IoT Voltage Monitor | Medical Instrument Bias Network |
Use Scenario: Monitoring battery voltage in coin-cell–powered wireless sensor nodes using ultra-low-current comparator inputs. IC Role / Device Role / Timing Role: Precision voltage threshold detector enabling wake-up when supply exceeds 22.8 V. Use Value: Sub-0.01 µA leakage at 18.2 V preserves multi-year battery life in sleep mode. |
Use Scenario: Generating stable bias for op-amp front-end stages in portable ECG amplifiers operating from isolated 24 V DC supplies. IC Role / Device Role / Timing Role: Low-noise voltage reference element stabilizing common-mode voltage in differential signal paths. Use Value: Dynamic impedance ≤40 Ω minimizes AC ripple coupling into sensitive biopotential measurement circuits. |
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, ±5% tolerance, but only 300 mW PD, higher ZZT (≤70 Ω), no AEC−Q101 qualification | Not suitable for automotive or sustained 500 mW operation; limited to low-duty-cycle reference use | Select when cost is primary constraint and thermal derating margin is available |
| MMSZ4709ET1G | Identical electrical specs and SOD−123 package; Pb−Free version with same marking "CK1" and AEC−Q101 qualification | No functional difference; differs only in RoHS compliance and tape/reel packaging (3,000 pcs/reel vs. 1,000 pcs/reel for ET1) | Prefer for new designs requiring Pb−Free compliance and full traceability |
Compared with BZX84-C24LT1G, MMSZ4709ET1 offers 67% higher continuous power rating and automotive qualification; compared with MMSZ4709ET1G, it uses legacy SnPb termination and smaller reel quantity, making it suitable for prototyping or legacy production continuity.
Availability
MMSZ4709ET1 is available at Aetrix Electronics and suitable for automotive sensor reference, industrial analog input protection, and low-power IoT voltage monitor applications requiring stable component supply, long-term lifecycle support, and AEC−Q101–compliant sourcing.
Supply support for MMSZ4709ET1 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
ON Semiconductor (now onsemi) is a global semiconductor supplier specializing in energy-efficient power, analog, sensor, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The MMSZ4xxxET1 series belongs to onsemi's precision Zener regulator portfolio designed for space-constrained, high-reliability applications demanding tight voltage tolerance, low leakage, and robust surge immunity - especially in automotive and industrial control systems.
FAQ
What is the Zener voltage tolerance of MMSZ4709ET1?
The MMSZ4709ET1 has a nominal Zener voltage of 24 V with a tolerance of ±5%, meaning the actual measured voltage at IZT = 50 mA falls between 22.8 V and 25.2 V. This tolerance is guaranteed across the full operating temperature range of −55°C to +150°C and is verified per the manufacturer's production test flow.
Is MMSZ4709ET1 qualified for automotive applications?
Yes, MMSZ4709ET1 is AEC−Q101 qualified and PPAP capable, confirming its suitability for automotive electronic systems including body control modules, powertrain sensors, and infotainment subsystems. The qualification covers stress tests for temperature cycling, humidity, mechanical shock, and high-temperature operating life.
What is the maximum continuous power dissipation for MMSZ4709ET1 on a standard PCB?
MMSZ4709ET1 delivers 500 mW continuous power dissipation on an FR−5 board at lead temperature (TL) = 75°C. Above 75°C, power must be linearly derated at 6.7 mW/°C, reaching zero at 150°C junction temperature. This rating assumes minimum recommended solder pad layout per the SOD−123 footprint diagram.
How does the leakage current of MMSZ4709ET1 compare to similar 24 V Zeners?
MMSZ4709ET1 specifies ≤0.01 µA reverse leakage current at VR = 18.2 V, which is significantly lower than many competing 24 V Zeners (e.g., BZX84-C24LT1G: ≤0.1 µA at 19.2 V). This ultra-low leakage supports high-impedance bias networks and extends battery life in always-on monitoring circuits.
What is the thermal resistance junction-to-ambient for MMSZ4709ET1?
The thermal resistance junction-to-ambient (RJA) for MMSZ4709ET1 is 340 °C/W, measured via infrared scan method on FR−5 board. This value reflects natural convection cooling with the minimum recommended copper pad area; adding thermal vias or larger copper pours can reduce effective RJA in practice.
MMSZ4709ET1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- SOD-123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-123
MMSZ4709ET1 FAQ
1.How can I place an order for MMSZ4709ET1 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMSZ4709ET1 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 MMSZ4709ET1 reliable?
The price and inventory of MMSZ4709ET1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMSZ4709ET1 is usually 5 days.
3.What payment methods are accepted for MMSZ4709ET1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ4709ET1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMSZ4709ET1?
MMSZ4709ET1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMSZ4709ET1 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 MMSZ4709ET1?
For technical support, including MMSZ4709ET1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ4709ET1 requirements.
6.How does Aetrix verify that MMSZ4709ET1 is sourced from the original manufacturer or authorized distributors?
All MMSZ4709ET1 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 MMSZ4709ET1 meets industry standards.
7.What is the process for return or replacement of MMSZ4709ET1?
All MMSZ4709ET1 units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ4709ET1, 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 MMSZ4709ET1 part is unused and in its original packaging.
Return procedure for MMSZ4709ET1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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