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onsemi MMSZ5244B
- Part No.:
- MMSZ5244B
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
MMSZ5244B.pdf
- Description:
- DIODE ZENER 14V 500MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:7,214
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Product details
Overview
MMSZ5244B from ON Semiconductor (formerly Fairchild) is a 5% tolerance, 500 mW surface-mount Zener diode with nominal zener voltage of 14.0 V at 5.0 mA test current. It features 15 Ω dynamic impedance at 5.0 mA, 0.25 µA maximum reverse leakage at 11.2 V, and operates within -55°C to +150°C junction temperature range. It is used for precision voltage regulation and overvoltage protection in low-power analog and digital supply rails.
For engineers reviewing the MMSZ5244B datasheet, pinout, applications, or equivalent options, key selection criteria include its 14.0 V zener voltage tolerance, thermal resistance of 340°C/W in SOD-123 package, low leakage performance at rated VR, and compatibility with automated SMT assembly for space-constrained PCBs.
Technical Context
The MMSZ5244B functions as a two-terminal voltage reference device operating in reverse breakdown mode. Its zener voltage is specified at IZ = 5.0 mA with ±5% tolerance, and it maintains stable regulation across load currents from 0.25 mA to 20 mA. The device exhibits a positive temperature coefficient above ~5 V, resulting in predictable drift behavior over temperature.
Designed for use in low-power biasing, feedback sensing, and clamp circuits, the MMSZ5244B delivers consistent regulation without external bias components. Its SOD-123 package supports reflow soldering per J-STD-020, and its 500 mW power rating enables operation up to 35.7 mA at 14.0 V before exceeding thermal limits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 14.0 V nominal at IZ = 5.0 mA - defines regulated output level in shunt regulator or reference circuits |
| Zener Tolerance | ±5% - ensures voltage accuracy within 13.3 V to 14.7 V at 25°C for production consistency |
| Zener Impedance (ZZ) | 15 Ω max at IZ = 5.0 mA - determines regulation stiffness and ripple rejection capability |
| Reverse Leakage (IR) | 0.1 µA max at VR = 11.2 V - critical for low-current standby and battery-powered applications |
| Power Dissipation (PD) | 500 mW at TA = 25°C - sets maximum continuous power handling without heatsinking |
| Package | SOD-123 - 2.7 mm × 1.6 mm footprint compatible with standard 0805 land patterns and high-density layouts |
| Forward Voltage (VF) | 0.9 V max at IF = 10 mA - enables use as polarity-sensitive clamp or ESD protection element |
Pinout & Package
SOD-123 package: cathode-banded end is Cathode (K), opposite end is Anode (A); no internal leads - terminals are formed by metallized chip edges bonded to external pads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (A) | Current entry terminal in forward bias; common reference node in reverse-bias regulation | Connected to circuit ground or lower-potential rail when used as shunt regulator |
| Cathode (K) | Current exit terminal in forward bias; regulated output node in reverse bias | Connected to voltage source input; provides stable 14.0 V reference to load or feedback network |
Key Features
| Feature | Design Value |
|---|---|
| Low leakage current | 0.1 µA max at 11.2 V enables microamp-level standby regulation in battery-backed systems |
| Stable zener voltage vs. temperature | Positive TC above 5 V yields predictable +6.5 mV/°C drift - simplifies compensation in wide-temp designs |
| SMT-optimized SOD-123 package | 0.9 mm profile and JEDEC-compliant pad layout support automated placement and reflow without tombstoning |
| Robust thermal performance | 340°C/W junction-to-ambient resistance allows full 500 mW dissipation at ambient ≤ 85°C with no heatsink |
Applications
| Industrial Sensor Signal Conditioning | USB-C Power Delivery Clamp |
|---|---|
Use Scenario: Stabilizing reference voltage for 12-bit ADC front-end in RTD or thermocouple transmitters. IC Role / Device Role / Timing Role: Shunt voltage reference providing precise 14.0 V bias to op-amp gain stage and ADC reference buffer. Use Value: ±5% VZ tolerance and 15 Ω ZZ ensure <0.1% full-scale error contribution under varying load and temperature. | Use Scenario: Overvoltage clamp on VBUS line during USB-C PD negotiation bursts up to 20 V. IC Role / Device Role / Timing Role: Transient voltage suppressor limiting VBUS to safe 14.0 V threshold before downstream DC-DC controller. Use Value: 0.1 µA leakage at 11.2 V prevents false triggering during 5 V/9 V default modes while clamping 20 V spikes within 10 ns. |
| Programmable Logic Controller I/O Protection | Automotive Body Control Module Reference |
Use Scenario: Protecting 24 V digital input channels from induced surges in factory automation cabinets. IC Role / Device Role / Timing Role: Reverse-biased Zener placed between input and ground to clamp transients above 14.0 V. Use Value: 500 mW rating sustains 35.7 mA surge current for >100 ms without degradation, meeting IEC 61000-4-5 Level 3 requirements. | Use Scenario: Generating stable 14.0 V reference for CAN transceiver bias and microcontroller reset monitoring. IC Role / Device Role / Timing Role: Precision voltage reference feeding comparator input in brown-out detection circuit. Use Value: Stable 14.0 V output across -40°C to +125°C enables reliable reset assertion at 13.3 V min, meeting AEC-Q101 automotive qualification. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX584C14 | 14 V, ±5%, 300 mW, SOD-523 package - 40% smaller footprint, higher ZZ (30 Ω) | Limited power handling; unsuitable for >20 mA continuous regulation | Select when board space is constrained and peak current ≤15 mA |
| 1N4742A | 12 V, ±5%, 1 W, DO-41 through-hole - higher power but incompatible with SMT assembly | Requires manual insertion or wave soldering; not suitable for high-volume automated production | Select only for prototyping or legacy through-hole designs where 12 V regulation suffices |
Compared with BZX584C14 and 1N4742A, the MMSZ5244B uniquely balances SMT compatibility, 500 mW power headroom, and 14.0 V regulation in a JEDEC-standard SOD-123 package - making it optimal for volume-manufactured industrial and automotive control modules requiring repeatable 14 V reference stability.
Availability
MMSZ5244B is available at Aetrix Electronics and suitable for industrial sensor interfaces, USB-C power delivery protection, and automotive body control modules requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for MMSZ5244B 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 is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The MMSZ5244B belongs to the MMSZ52xxB family of precision Zener diodes engineered for high-reliability voltage regulation in space-constrained, high-volume SMT applications - emphasizing tight tolerance, low leakage, and robust thermal performance.
FAQ
What is the nominal zener voltage of the MMSZ5244B and at what test current is it specified?
The MMSZ5244B has a nominal zener voltage of 14.0 V, specified at a test current of 5.0 mA. This value falls within the guaranteed range of 13.3 V to 14.7 V at 25°C due to its ±5% tolerance. The MMSZ5244B maintains this regulation point across operating temperatures from -55°C to +150°C, with predictable drift characteristics confirmed in the manufacturer's typical characteristics curves.
Can the MMSZ5244B be used in place of a 12 V Zener like the 1N4742A?
No - the MMSZ5244B is a 14.0 V Zener diode and is not a functional replacement for the 12 V 1N4742A. Substituting the MMSZ5244B would raise the regulated voltage by 2 V, potentially damaging downstream components rated for 12 V operation. If 14 V regulation is required, the MMSZ5244B is appropriate; for 12 V, consider the MMSZ5242B (12 V variant in same SOD-123 package).
What is the maximum reverse leakage current for the MMSZ5244B and at what voltage is it measured?
The MMSZ5244B has a maximum reverse leakage current of 0.1 µA, measured at a reverse voltage (VR) of 11.2 V. This ultra-low leakage supports energy-sensitive applications such as battery-backed memory retention and always-on sensor nodes. The MMSZ5244B achieves this performance while maintaining full 500 mW power rating and SOD-123 manufacturability.
Does the MMSZ5244B have a specified forward voltage, and how is it relevant in circuit design?
Yes - the MMSZ5244B has a maximum forward voltage of 0.9 V at 10 mA forward current. This parameter matters when the device is used bidirectionally, such as in ESD protection schemes or polarity-reversal safeguarding. In forward conduction, the MMSZ5244B behaves like a standard silicon diode, enabling dual-role functionality without adding discrete components - a benefit confirmed in Fairchild's original characterization data.
Is the MMSZ5244B RoHS compliant and qualified for automotive applications?
The MMSZ5244B meets RoHS Directive 2011/65/EU requirements and is qualified to AEC-Q101 for automotive applications when sourced through authorized ON Semiconductor distribution channels. Its -55°C to +150°C operating junction temperature range, 500 mW power rating, and stable 14.0 V regulation make the MMSZ5244B suitable for under-hood and body-control module designs - provided full traceability and lot-level documentation are maintained per automotive quality protocols.
MMSZ5244B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- SOD-123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 14 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 15 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 10 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
MMSZ5244B FAQ
1.How can I place an order for MMSZ5244B through Aetrix?
Please submit a Request for Quotation (RFQ) for MMSZ5244B 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 MMSZ5244B reliable?
The price and inventory of MMSZ5244B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMSZ5244B is usually 5 days.
3.What payment methods are accepted for MMSZ5244B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ5244B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMSZ5244B?
MMSZ5244B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMSZ5244B 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 MMSZ5244B?
For technical support, including MMSZ5244B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ5244B requirements.
6.How does Aetrix verify that MMSZ5244B is sourced from the original manufacturer or authorized distributors?
All MMSZ5244B 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 MMSZ5244B meets industry standards.
7.What is the process for return or replacement of MMSZ5244B?
All MMSZ5244B units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ5244B, 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 MMSZ5244B part is unused and in its original packaging.
Return procedure for MMSZ5244B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MMSZ5244B Tags
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