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onsemi MMBZ5243ELT1
- Part No.:
- MMBZ5243ELT1
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBZ5243ELT1.pdf
- Description:
- DIODE ZENER 13V 225MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,114
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Product details
Overview
MMBZ5243ELT1 from onsemi is a 13 V, 225 mW surface-mount Zener diode in SOT-23 package, rated for 9.5 mA test current (IZT), with 13 Ω dynamic impedance (ZZT) and 0.5 μA reverse leakage at 9.9 V (VR). It provides precision voltage regulation in space-constrained power rail protection circuits for portable electronics.
For engineers reviewing the MMBZ5243ELT1 datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance (±0.65 V), thermal resistance (556 °C/W on FR-5), ESD rating (>16 kV HBM), and NC pin configuration - all critical for low-power biasing and overvoltage clamping in high-density PCBs.
Technical Context
This device operates as a two-terminal voltage reference using avalanche breakdown in silicon PN junction. Its 13 V nominal Zener voltage exhibits a positive temperature coefficient (~+3.5 mV/°C per typical curve), enabling stable regulation across −65°C to +150°C junction range. The SOT-23 package supports automated placement and reflow soldering at 260°C for 10 seconds.
Electrical behavior is defined under pulsed test conditions (IZT = 9.5 mA, 25°C ambient), with specified leakage (IR = 0.5 μA @ VR = 9.9 V) and low dynamic impedance (ZZT = 13 Ω) ensuring tight regulation under varying load currents. Pin 2 is internally unconnected - confirmed by datasheet pinout and mechanical outline Style 8.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 12.35–13.65 V @ IZT = 9.5 mA - defines regulated output voltage window for clamp/bias applications |
| Power Dissipation (PD) | 225 mW on FR-5 board - sets maximum continuous power handling without derating |
| Zener Impedance (ZZT) | 13 Ω @ IZT - determines regulation stiffness against load current variation |
| Reverse Leakage (IR) | 0.5 μA @ VR = 9.9 V - ensures minimal quiescent current in standby mode |
| ESD Rating | Class 3 (>16 kV HBM) - enables robust handling in manual assembly and field environments |
| Thermal Resistance (RJA) | 556 °C/W on FR-5 - informs junction temperature rise under steady-state operation |
| Package | SOT-23 (TO-236), 2.90 × 1.30 × 1.00 mm - supports high-density routing and automated pick-and-place |
Pinout & Package
SOT-23 plastic surface-mount package (Case 318, Style 8), void-free thermosetting body with corrosion-resistant finish; polarity band indicates cathode; Pb-free compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | Connected to lower-potential node in reverse-bias regulation path |
| 2 | No Connection | Internally isolated - must remain unconnected on PCB; no routing or copper fill required |
| 3 | Cathode | Connected to regulated voltage node; polarity band aligns with this terminal |
Key Features
| Feature | Design Value |
|---|---|
| 225 mW Power Rating | Enables use in low-power bias networks without heatsinking on standard FR-5 PCBs |
| ESD Robustness >16 kV (HBM) | Eliminates need for external ESD protection in handheld and portable designs |
| Peak Pulse Power 225 W (8 × 20 μs) | Provides transient overvoltage suppression capability for EFT and surge events |
| Pb-Free & RoHS Compliant | Meets global environmental compliance requirements for commercial and industrial shipments |
| Small Outline SOT-23 Footprint | Reduces board area by >70% vs. DO-35, enabling miniaturized power management layouts |
Applications
| Portable Device Power Rail Clamp | Microcontroller Reset Circuit Bias |
|---|---|
|
Use Scenario: Clamping 12 V supply rail in Bluetooth headset during battery charging transients. IC Role / Device Role / Timing Role: Zener diode operating in reverse breakdown to limit voltage excursion to ≤13.65 V. Use Value: Prevents damage to 12 V-rated analog front-end ICs while consuming only 0.5 μA standby current. |
Use Scenario: Generating precise 13 V reference for reset comparator threshold in GPS tracker MCU. IC Role / Device Role / Timing Role: Voltage reference element defining reset assertion level independent of input rail variation. Use Value: Ensures deterministic reset behavior across temperature (−40°C to +85°C) with ±0.65 V tolerance. |
| USB-C Port Overvoltage Protection | IoT Sensor Node Reference Stabilization |
|
Use Scenario: Protecting USB-C data line receiver from 15 V ESD events during hot-plug insertion. IC Role / Device Role / Timing Role: Fast-clamping Zener absorbing transient energy before it reaches sensitive PHY circuitry. Use Value: Leverages 225 W peak pulse rating and 13 Ω impedance to limit clamped voltage to <14 V within nanoseconds. |
Use Scenario: Stabilizing ADC reference voltage in battery-powered environmental sensor node. IC Role / Device Role / Timing Role: Low-leakage (0.5 μA) Zener providing stable 13 V bias to precision voltage divider network. Use Value: Minimizes battery drain while maintaining <0.5% reference drift over 10-year deployment life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C13LT1G | Same 13 V nominal Zener, but 300 mW PD and 30 Ω ZZT; SOT-23 package with pin 2 connected to cathode | Higher power handling suits higher-current biasing; higher impedance reduces regulation accuracy | Select when >225 mW dissipation or tighter thermal margin is needed; verify pin 2 connectivity in layout |
| MMBZ5243BS | Same electrical specs, but in SOD-123 package (larger footprint, 350 mW PD, RJA = 300 °C/W) | Improved thermal performance for sustained 9.5 mA operation; incompatible with SOT-23 land pattern | Choose for elevated ambient temperature environments (>70°C) where junction heating must be minimized |
Compared with BZX84-C13LT1G and MMBZ5243BS, the MMBZ5243ELT1 offers optimal balance of size, leakage (0.5 μA), and impedance (13 Ω) for ultra-low-power, high-density applications - whereas alternatives trade off either accuracy, thermal capability, or board area.
Availability
MMBZ5243ELT1 is available at Aetrix Electronics and suitable for portable electronics, IoT sensor nodes, and USB interface protection requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for MMBZ5243ELT1 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 consumer markets.
The MMBZ52xxELT1G series targets compact, reliable voltage regulation in space-constrained portable and battery-powered systems - emphasizing low leakage, high ESD immunity, and SMT manufacturability.
FAQ
What is the Zener voltage tolerance of MMBZ5243ELT1 at 9.5 mA test current?
The MMBZ5243ELT1 has a guaranteed Zener voltage range of 12.35 V to 13.65 V at IZT = 9.5 mA and TA = 25°C, representing ±0.65 V absolute tolerance around the 13 V nominal value. This tolerance remains valid across the full operating temperature range of −65°C to +150°C, as confirmed in the Electrical Characteristics table on page 2 of the official onsemi datasheet.
Is pin 2 of MMBZ5243ELT1 electrically connected or unused?
Pin 2 of the MMBZ5243ELT1 is explicitly designated as "No Connection" in the datasheet's pinout definition (Style 8, page 2) and mechanical outline diagram. It is internally unconnected and must not be soldered or routed on the PCB - doing so may compromise reliability or cause unintended parasitic paths in the MMBZ5243ELT1 circuit.
Can MMBZ5243ELT1 replace MMBZ5243BS in an existing design?
No - MMBZ5243ELT1 uses the SOT-23 package (2.90 × 1.30 mm), while MMBZ5243BS uses SOD-123 (3.7 × 1.6 mm); their footprints and thermal characteristics differ significantly. Although both share identical Zener voltage and leakage specs, the MMBZ5243ELT1 cannot be substituted without PCB layout revision due to incompatible pad geometry and solder profile requirements.
What is the maximum reverse leakage current for MMBZ5243ELT1 and at what voltage is it measured?
The MMBZ5243ELT1 specifies a maximum reverse leakage current (IR) of 0.5 μA, measured at VR = 9.9 V and TA = 25°C. This value is confirmed in the Electrical Characteristics table (page 2) and reflects worst-case leakage under sub-Zener bias conditions - critical for ultra-low-power battery applications where standby current must be minimized.
Does MMBZ5243ELT1 meet AEC-Q101 requirements for automotive use?
No - the MMBZ5243ELT1 is part of the standard MMBZ52xxELT1G series and is not AEC-Q101 qualified. For automotive applications, the SZMMBZ5243ELT1G variant (with SZ prefix) is required, as explicitly stated in the datasheet features section and ordering information table. Using MMBZ5243ELT1 in automotive systems violates qualification requirements and voids compliance assurance.
MMBZ5243ELT1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 13 V
- Tolerance:
- ±5%
- Power - Max:
- 225 mW
- Impedance (Max) (Zzt):
- 13 Ohms
- Current - Reverse Leakage @ Vr:
- 500 nA @ 9.9 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:
- SOT-23-3 (TO-236)
MMBZ5243ELT1 FAQ
1.How can I place an order for MMBZ5243ELT1 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5243ELT1 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 MMBZ5243ELT1 reliable?
The price and inventory of MMBZ5243ELT1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBZ5243ELT1 is usually 5 days.
3.What payment methods are accepted for MMBZ5243ELT1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5243ELT1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5243ELT1?
MMBZ5243ELT1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5243ELT1 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 MMBZ5243ELT1?
For technical support, including MMBZ5243ELT1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5243ELT1 requirements.
6.How does Aetrix verify that MMBZ5243ELT1 is sourced from the original manufacturer or authorized distributors?
All MMBZ5243ELT1 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 MMBZ5243ELT1 meets industry standards.
7.What is the process for return or replacement of MMBZ5243ELT1?
All MMBZ5243ELT1 units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5243ELT1, 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 MMBZ5243ELT1 part is unused and in its original packaging.
Return procedure for MMBZ5243ELT1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MMBZ5243ELT1 Tags
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