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onsemi MMSZ4709T1
- Part No.:
- MMSZ4709T1
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
MMSZ4709T1.pdf
- Description:
- DIODE ZENER 24V 500MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:8,874
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Product details
Overview
MMSZ4709T1 from onsemi is a 24 V ±5% Zener voltage regulator diode in SOD−123 package, rated for 500 mW power dissipation at 75°C, with 50 µA test current (IZT), 18.2 V reverse voltage (VR) at 1 µA leakage, and −55°C to +150°C operating temperature range-used for precision voltage reference and overvoltage protection in low-power analog circuits.
For engineers reviewing the MMSZ4709T1 datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance, dynamic impedance, temperature coefficient, leakage current at VR, and thermal derating behavior in compact PCB layouts.
Technical Context
This device operates as a two-terminal shunt voltage regulator, maintaining stable output voltage across varying load currents by conducting reverse breakdown current above its nominal Zener voltage of 24 V. Its low IZT (50 µA) enables accurate regulation in ultra-low-current bias networks.
The SOD−123 package provides optimized thermal resistance (RJL = 150°C/W, RJA = 340°C/W) and ESD robustness (Class 3, >16 kV HBM), supporting reliable operation in space-constrained industrial sensor nodes and automotive body electronics where board-level surge immunity is critical.
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 reference design |
| Power Dissipation (PD) | 500 mW @ TL = 75°C, derated 6.7 mW/°C above - sets maximum continuous power in FR-5 board layout |
| Reverse Leakage (IR) | ≤1 µA @ VR = 18.2 V - ensures minimal quiescent current in standby-mode protection circuits |
| Junction Temp Range | −55°C to +150°C - supports operation in under-hood automotive and industrial control environments |
| Dynamic Impedance (ZZT) | ~80 Ω @ IZ = 1 mA (typical) - determines voltage deviation under small-signal AC load transients |
| ESD Rating | Class 3 (>16 kV) per HBM - eliminates need for external ESD clamps in I/O protection designs |
Pinout & Package
SOD−123 surface-mount plastic package (1.60 × 2.69 × 1.16 mm), void-free thermosetting case with cathode polarity band marking; designed for automated pick-and-place and reflow soldering (260°C/10 s max).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Banded End) | Cathode | Connected to regulated voltage node; reverse-biased terminal during Zener conduction |
| 2 (Non-banded End) | Anode | Connected to circuit ground or lower-potential rail; completes shunt regulation path |
Key Features
| Feature | Design Value |
|---|---|
| Low Test Current Regulation | Stable 24 V Zener voltage established at only 50 µA IZT - ideal for micropower biasing of op-amps and comparators |
| High-Temp Reliability | Rated for continuous operation up to +150°C junction temperature - suitable for engine control unit (ECU) sensor interfaces |
| Pb-Free & RoHS Compliance | Meets global environmental standards without lead or hazardous substances - simplifies export compliance and end-of-life handling |
| Small Outline Package | SOD−123 footprint (1.6 × 2.7 mm) enables high-density placement in wearables and IoT edge nodes |
Applications
| Industrial Sensor Interface | Automotive Body Control Module |
|---|---|
Use Scenario: Providing stable 24 V reference for analog front-end conditioning of pressure and temperature sensors in factory automation systems. IC Role / Device Role / Timing Role: Shunt voltage reference and overvoltage clamp protecting ADC input stages from transient surges. Use Value: Tight 5% VZ tolerance and <1 µA leakage at 18.2 V ensure measurement accuracy and zero-load current draw in battery-backed systems. | Use Scenario: Regulating supply to microcontroller reset circuitry and LIN bus transceiver bias rails in door module ECUs. IC Role / Device Role / Timing Role: Standby-mode voltage supervisor and ESD protection element co-located with LIN PHY. Use Value: Class 3 HBM rating (>16 kV) and −55°C to +150°C operation eliminate external TVS diodes and extend field reliability. |
| Portable Medical Instrument | Smart Home Energy Monitor |
Use Scenario: Generating precise bias voltage for low-noise instrumentation amplifiers in handheld pulse oximeters. IC Role / Device Role / Timing Role: Low-current Zener reference replacing larger 3-pin IC regulators to reduce BOM count and board area. Use Value: 50 µA IZT enables regulation with nanoampere-level supply current - extends battery life beyond 12 months. | Use Scenario: Clamping voltage spikes on AC mains sensing inputs and providing reference for isolated current shunt measurements. IC Role / Device Role / Timing Role: Dual-role component serving as both overvoltage protector and calibration reference source. Use Value: Matched 24 V Zener voltage and 80 Ω dynamic impedance ensure consistent response across production units and temperature cycles. |
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 | Same 24 V nominal Zener, but 300 mW PD rating and SOT-23 package - higher thermal resistance (RJA = 450°C/W) | Limited to lower-power applications due to reduced power handling; less suitable for sustained 500 mW dissipation | Select when board space allows SOT-23 and thermal budget permits lower derating margin |
| MMSZ5242BT1G | 24 V Zener but older series with 1.0 mA IZT, higher leakage (≤5 µA @ 18.2 V), and no AEC-Q101 qualification | Not qualified for automotive use; higher test current increases quiescent power in always-on circuits | Choose for cost-sensitive consumer applications where AEC-Q101 and ultra-low IZT are not required |
Compared with BZX84-C24LT1G and MMSZ5242BT1G, the MMSZ4709T1 delivers superior thermal performance in SOD-123, lowest IZT for micropower designs, and automotive-grade qualification - making it optimal for space-constrained, high-reliability, low-quiescent systems.
Availability
MMSZ4709T1 is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive body control modules, portable medical instruments, and smart home energy monitors requiring stable component supply and long-term lifecycle support.
Supply support for MMSZ4709T1 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.
The MMSZ4xxxT1G series was engineered specifically for high-density, low-power voltage regulation and protection in surface-mount applications-emphasizing tight Zener tolerance, low leakage, and robust thermal and ESD performance in miniature packages.
FAQ
What is the nominal Zener voltage and tolerance of the MMSZ4709T1?
The MMSZ4709T1 has a nominal Zener voltage of 24 V with a tolerance of ±5%, specified as 22.8 V minimum and 25.2 V maximum at IZT = 50 µA and TA = 25°C. This tight tolerance ensures predictable regulation in precision analog circuits where reference stability directly impacts measurement accuracy. The MMSZ4709T1 achieves this performance while maintaining low test current requirements and high-temperature reliability.
Does the MMSZ4709T1 meet automotive qualification standards?
Yes, the MMSZ4709T1 is AEC−Q101 qualified and PPAP capable, confirming its suitability for automotive applications such as body control modules and sensor interfaces. It also carries the SZ prefix option (SZMMSZ4709T1G) for applications requiring unique site and process controls. The MMSZ4709T1's −55°C to +150°C operating range and >16 kV HBM ESD rating further support its deployment in harsh automotive environments.
What is the maximum power dissipation and thermal derating behavior of the MMSZ4709T1?
The MMSZ4709T1 is rated for 500 mW total power dissipation on FR-5 board at TL = 75°C, with linear derating of 6.7 mW/°C above that temperature. Its thermal resistance is 150°C/W junction-to-lead and 340°C/W junction-to-ambient. These values mean the MMSZ4709T1 can sustain full-rated power only with adequate copper pour or thermal vias - critical for reliability in enclosed industrial enclosures where ambient temperature exceeds 75°C.
How does the leakage current of the MMSZ4709T1 compare to similar Zener diodes?
The MMSZ4709T1 exhibits ≤1 µA reverse leakage current at VR = 18.2 V and TA = 25°C - significantly lower than legacy Zeners like MMSZ5242BT1G (≤5 µA at same VR). This ultra-low leakage minimizes parasitic current paths in battery-powered systems and improves accuracy in high-impedance reference networks. The MMSZ4709T1 maintains this performance across its full operating temperature range, supporting long-term stability in portable equipment.
Is the MMSZ4709T1 RoHS compliant and Pb-free?
Yes, the MMSZ4709T1 is Pb-free and fully RoHS compliant, meeting global environmental regulations including EU Directive 2011/65/EU. The "G" suffix in the full part number (MMSZ4709T1G) explicitly denotes Pb-free packaging. This compliance applies to both die, mold compound, and termination finishes - ensuring safe disposal, recyclability, and unrestricted export to regulated markets without requiring special exemptions or declarations.
MMSZ4709T1 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
MMSZ4709T1 FAQ
1.How can I place an order for MMSZ4709T1 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMSZ4709T1 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 MMSZ4709T1 reliable?
The price and inventory of MMSZ4709T1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMSZ4709T1 is usually 5 days.
3.What payment methods are accepted for MMSZ4709T1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ4709T1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMSZ4709T1?
MMSZ4709T1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMSZ4709T1 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 MMSZ4709T1?
For technical support, including MMSZ4709T1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ4709T1 requirements.
6.How does Aetrix verify that MMSZ4709T1 is sourced from the original manufacturer or authorized distributors?
All MMSZ4709T1 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 MMSZ4709T1 meets industry standards.
7.What is the process for return or replacement of MMSZ4709T1?
All MMSZ4709T1 units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ4709T1, 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 MMSZ4709T1 part is unused and in its original packaging.
Return procedure for MMSZ4709T1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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