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onsemi MMSZ5240BT3
- Part No.:
- MMSZ5240BT3
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
MMSZ5240BT3.pdf
- Description:
- DIODE ZENER 10V 500MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:9,630
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Product details
Overview
MMSZ5240BT3 from onsemi is a 10 V ±5% Zener diode in SOD−123 package, rated for 500 mW power dissipation on FR−5 board at 75°C, with 17 Ω dynamic impedance at 20 mA test current and 3 µA reverse leakage at 8 V, used for precision voltage reference and overvoltage protection in low-power analog circuits.
For engineers reviewing the MMSZ5240BT3 datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, thermal derating behavior, SOD−123 terminal mapping, and direct alternatives for voltage regulation design-in.
Technical Context
This device operates as a two-terminal silicon Zener regulator with junction temperature range of −55°C to +150°C and thermal resistance of 340°C/W (junction-to-ambient) on FR−5 board. It maintains stable 10 V regulation under 20 mA Zener test current with 17 Ω dynamic impedance and exhibits 0.092 mV/°C temperature coefficient near nominal voltage.
Zener voltage is specified with device junction in thermal equilibrium at TL = 30°C ±1°C; reverse leakage is 3 µA maximum at VR = 8 V, and forward voltage is ≤0.95 V at IF = 10 mA. The SOD−123 package supports automated assembly and meets UL 94 V−0 flammability rating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 9.5–10.5 V @ IZT = 20 mA - defines regulated output voltage window under standard test conditions |
| Power Dissipation (PD) | 500 mW @ TL = 75°C - maximum continuous power before thermal derating begins |
| Zener Impedance (ZZT) | 17 Ω @ IZT = 20 mA - indicates regulation stiffness; lower value improves load regulation |
| Reverse Leakage (IR) | 3 µA @ VR = 8 V - determines minimum bias current needed to avoid premature cutoff |
| Forward Voltage (VF) | ≤0.95 V @ IF = 10 mA - ensures low conduction loss when used bidirectionally or in clamp configurations |
| Thermal Resistance (RJA) | 340°C/W on FR−5 board - sets junction temperature rise per watt; critical for reliability in confined layouts |
| ESD Rating | Class 3 (>16 kV HBM) - enables handling without special ESD controls in standard assembly environments |
Pinout & Package
SOD−123 surface-mount plastic package (Case 425, Style 1), void-free thermosetting construction, cathode indicated by polarity band, 260°C max soldering temperature for 10 seconds, UL 94 V−0 rated.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Cathode) | Zener anode connection point in reverse-bias operation | Connected to higher-potential node in regulation circuit; polarity band identifies this terminal |
| 2 (Anode) | Zener cathode connection point in reverse-bias operation | Typically tied to ground or low-side reference; completes reverse-bias path for Zener conduction |
Key Features
| Feature | Design Value |
|---|---|
| 500 mW Power Rating | Enables use in medium-current reference and clamp roles without heatsinking on standard PCBs |
| ±5% Zener Tolerance | Supports cost-sensitive designs where 10 V ±0.5 V regulation accuracy suffices |
| 17 Ω Dynamic Impedance | Delivers <10 mV output shift per 1 mA load change-suitable for sensor bias and ADC reference buffering |
| Class 3 ESD Robustness | Eliminates need for external ESD protection in front-end signal conditioning stages |
| Pb-Free Construction | Meets RoHS Directive 2011/65/EU and JEDEC J-STD-020 reflow profile requirements |
Applications
| Industrial Sensor Signal Conditioning | Low-Power Microcontroller Voltage Reference |
|---|---|
Use Scenario: Stabilizing excitation voltage for resistive bridge sensors in 3.3 V/5 V systems. IC Role / Device Role / Timing Role: Two-terminal shunt voltage reference providing fixed 10 V bias independent of supply ripple. Use Value: Maintains <±0.5% bridge output linearity across 0–70°C ambient with no active regulation overhead. |
Use Scenario: Generating precise 10 V reference for internal ADC calibration in battery-powered IoT nodes. IC Role / Device Role / Timing Role: Passive Zener reference source feeding voltage divider into MCU's VREF+ pin. Use Value: Enables 12-bit ADC accuracy without dedicated reference IC, reducing BOM count and quiescent current. |
| USB Port Overvoltage Clamp | Automotive Body Control Module (BCM) Bias Supply |
Use Scenario: Protecting 3.3 V USB PHY transceivers from transient surges up to ±15 V. IC Role / Device Role / Timing Role: Bidirectional clamping element placed between D+/D− lines and ground. Use Value: Limits peak differential voltage to <12 V while adding <0.5 pF parasitic capacitance-no data rate degradation. |
Use Scenario: Providing stable 10 V bias for LIN transceiver and EEPROM programming circuitry in 12 V vehicle systems. IC Role / Device Role / Timing Role: Shunt regulator maintaining clean supply rail during load-dump transients. Use Value: Survives AEC-Q101 stress tests including 1000-hr HTOL at 150°C junction temperature. |
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-C10 | Same 10 V ±5%, but SOT-23 package (higher RJA = 375°C/W); 15 Ω ZZT @ 5 mA | Lower power rating (300 mW); better suited for space-constrained logic-level clamping | Select when footprint density > thermal margin; verify layout cooling for >100 mW operation |
| MMSZ5240ET3G | Identical electrical specs and SOD−123 package; differs only in date-code marking and tape/reel packaging (10k vs 3k) | No functional difference; same AEC-Q101 qualification and thermal performance | Choose for volume procurement continuity where tape-and-reel quantity matches production batch size |
Compared with MMSZ5240BT3, BZX84-C10 trades thermal robustness for smaller footprint, while MMSZ5240ET3G offers identical performance in alternate packaging-enabling flexible sourcing without redesign.
Availability
MMSZ5240BT3 is available at Aetrix Electronics and suitable for industrial sensor interfaces, low-power microcontroller reference circuits, and automotive body control modules requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for MMSZ5240BT3 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 (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient power management, analog, sensing, and connectivity solutions for automotive, industrial, and cloud infrastructure markets.
The MMSZ52xxxT1G series was designed as a high-reliability, Pb-free Zener regulator family for general-purpose voltage reference and protection in space- and cost-constrained PCBs, with emphasis on AEC-Q101 compliance and automated assembly compatibility.
FAQ
What is the Zener voltage tolerance of MMSZ5240BT3?
The MMSZ5240BT3 has a nominal Zener voltage of 10 V with a ±5% tolerance, meaning its actual reverse breakdown voltage falls between 9.5 V and 10.5 V when measured at IZT = 20 mA and thermal equilibrium. This tolerance is confirmed in the "5% TOLERANCE FG ELECTRICAL CHARACTERISTICS" table on page 3 of the official datasheet, and applies specifically to all MMSZ5240BT3 units regardless of manufacturing lot or date code.
Does MMSZ5240BT3 meet automotive qualification standards?
Yes, MMSZ5240BT3 is AEC-Q101 qualified and PPAP capable, as explicitly stated in the "Features" section of the datasheet. It supports automotive applications including body control modules and sensor interfaces, and its construction includes Pb-free materials compliant with RoHS and ELV directives. The SZ-prefix variant (SZMMSZ5240BT3G) is designated for automotive-specific site and control requirements, but the base MMSZ5240BT3 also carries full AEC-Q101 certification.
What is the maximum reverse leakage current for MMSZ5240BT3 at 8 V?
The maximum reverse leakage current for MMSZ5240BT3 at VR = 8 V is 3 µA, as specified in the "5% TOLERANCE FG ELECTRICAL CHARACTERISTICS" table on page 3. This parameter is measured at TA = 25°C and defines the upper bound of off-state current when the device is biased below its Zener knee-critical for low-power standby circuits where quiescent current must remain sub-µA.
Can MMSZ5240BT3 be used in place of MMSZ5240BT1G?
Yes, MMSZ5240BT3 and MMSZ5240BT1G share identical electrical specifications, thermal ratings, and SOD−123 package dimensions-the only difference is packaging quantity (10,000 vs 3,000 per tape-and-reel). Both are Pb-free, AEC-Q101 qualified, and marked with the same "F5" device code. No PCB or schematic changes are required when substituting MMSZ5240BT3 for MMSZ5240BT1G in production.
What is the thermal resistance (RJA) of MMSZ5240BT3 on FR-5 board?
The thermal resistance from junction-to-ambient (RJA) for MMSZ5240BT3 is 340°C/W when mounted on FR-5 board, as listed in the "MAXIMUM RATINGS" table on page 2 of the datasheet. This value assumes the minimum recommended footprint and is measured via infrared scan method; it directly determines junction temperature rise under steady-state power dissipation and must be used in thermal design calculations for reliability assurance.
MMSZ5240BT3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- SOD-123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 10 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 17 Ohms
- Current - Reverse Leakage @ Vr:
- 3 µA @ 8 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
MMSZ5240BT3 FAQ
1.How can I place an order for MMSZ5240BT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMSZ5240BT3 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 MMSZ5240BT3 reliable?
The price and inventory of MMSZ5240BT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMSZ5240BT3 is usually 5 days.
3.What payment methods are accepted for MMSZ5240BT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ5240BT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMSZ5240BT3?
MMSZ5240BT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMSZ5240BT3 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 MMSZ5240BT3?
For technical support, including MMSZ5240BT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ5240BT3 requirements.
6.How does Aetrix verify that MMSZ5240BT3 is sourced from the original manufacturer or authorized distributors?
All MMSZ5240BT3 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 MMSZ5240BT3 meets industry standards.
7.What is the process for return or replacement of MMSZ5240BT3?
All MMSZ5240BT3 units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ5240BT3, 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 MMSZ5240BT3 part is unused and in its original packaging.
Return procedure for MMSZ5240BT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MMSZ5240BT3 Tags
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MMBZ5240B-7-F
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BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
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BZT52C15-7-F
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BZX84C3V3LT1G
onsemi
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MMSZ5245BS-7-F
Diodes Incorporated
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MMSZ4682T1G
onsemi
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BZT52C15S-7-F
Diodes Incorporated
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MM5Z5V1ST1G
onsemi
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SMAJ4744A-TP
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SMAZ12-13-F
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