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onsemi MMBZ5243BLT1
- Part No.:
- MMBZ5243BLT1
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBZ5243BLT1.pdf
- Description:
- DIODE ZENER 13V 225MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,859
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Product details
Overview
MMBZ5243BLT1 from onsemi is a 13 V, 225 mW surface-mount Zener diode in SOT-23 package, designed for precision voltage regulation and overvoltage protection in space-constrained circuits. It delivers 9.5 mA test current, 13 Ω dynamic impedance at IZT, and 0.5 μA leakage at 9.9 V reverse bias, with ESD rating >16 kV (HBM). It is widely deployed in cellular phone power rails and portable device voltage reference circuits.
For engineers reviewing the MMBZ5243BLT1 datasheet, pinout, applications, or equivalent options, key selection criteria include nominal Zener voltage tolerance (±5%), thermal resistance (556 °C/W on FR-5), cathode-anode polarity marking, and Pb-free RoHS-compliant packaging for high-density PCB assembly.
Technical Context
This Zener diode operates in reverse breakdown to maintain stable voltage across its terminals under varying load and temperature conditions. Its 13 V nominal Zener voltage exhibits a positive temperature coefficient near zero crossing - typical for mid-voltage Zeners - enabling predictable drift behavior from −65°C to +150°C junction temperature range.
The SOT-23 package features three terminals: anode (Pin 1), no connection (Pin 2), and cathode (Pin 3), with cathode polarity indicated by a band. The device is rated for 225 mW dissipation on FR-5 board at 25°C, derating linearly at 1.8 mW/°C above ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 12.35–13.65 V @ 9.5 mA - defines regulated output voltage window under standard test conditions |
| Power Dissipation (PD) | 225 mW on FR-5 board @ 25°C - sets maximum continuous power handling before thermal derating applies |
| Zener Impedance (ZZT) | 13 Ω @ IZT = 9.5 mA - determines voltage regulation stiffness against load current changes |
| Leakage Current (IR) | 0.5 μA @ VR = 9.9 V - specifies off-state conduction level below breakdown, critical for low-power standby |
| ESD Rating | Class 3 (>16 kV HBM) - ensures robustness against electrostatic discharge during automated PCB assembly |
| Junction Temperature Range | −65°C to +150°C - supports operation in automotive cabin, industrial control, and outdoor portable environments |
Pinout & Package
SOT-23 (TO-236) plastic surface-mount package, 2.90 × 1.30 × 1.00 mm, void-free thermosetting case with corrosion-resistant finish. Cathode identified by polarity band; maximum soldering temperature 260°C for 10 seconds.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode | Connected to lower-potential side of regulated node; reverse-biased during Zener operation |
| Pin 2 | No Connection | Internally unconnected; must remain floating - not tied to ground or any signal |
| Pin 3 | Cathode | Connected to higher-potential side; polarity band marks this terminal for correct orientation |
Key Features
| Feature | Design Value |
|---|---|
| Low-profile SOT-23 footprint | Enables placement on dense PCBs where height clearance <1.0 mm is required, e.g., slim smartphones |
| Pb-free, Halogen-free, RoHS-compliant | Meets global environmental compliance mandates without requiring special lead-free reflow profiles |
| 225 mW power rating on FR-5 | Supports stable regulation in battery-powered systems with limited heat sinking capability |
| ESD immunity >16 kV (HBM) | Eliminates need for external ESD protection in handheld product front-end power stages |
Applications
| Smartphone Power Rail Protection | USB-C Port Voltage Clamp |
|---|---|
Use Scenario: Clamping transient overvoltage spikes on 12 V auxiliary rails in LTE/5G handsets during hot-plug or ESD events. IC Role / Device Role / Timing Role: Zener diode operating in reverse breakdown to shunt excess energy to ground. Use Value: Prevents damage to PMIC input stages using only 2.9 × 1.3 mm area and no active control logic. |
Use Scenario: Limiting VBUS voltage excursions beyond 13 V during USB-C cable insertion or adapter mismatch. IC Role / Device Role / Timing Role: Passive voltage clamp placed between VBUS and GND, activated above 12.35 V. Use Value: Achieves sub-100 ns response time without delay or power-up sequencing dependencies. |
| Industrial Sensor Reference Stability | IoT Node Battery Monitoring |
Use Scenario: Providing stable 13 V reference for analog front-end ADC biasing in factory-floor temperature sensors. IC Role / Device Role / Timing Role: Precision Zener used as shunt reference in two-terminal configuration with series resistor. Use Value: Maintains ±1% regulation accuracy over −40°C to +85°C ambient with <0.5 μA leakage at 9.9 V. |
Use Scenario: Detecting end-of-charge condition in Li-ion battery packs by monitoring cell voltage via resistive divider into microcontroller ADC. IC Role / Device Role / Timing Role: Overvoltage limiter protecting MCU GPIO pins from accidental 14 V charger feedback. Use Value: Enables direct connection to battery sense line without additional TVS or regulator IC. |
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-C13 | Same 13 V nominal Zener, but 300 mW rating and higher ZZT (30 Ω); SOT-23 package with Pin 1 = cathode, Pin 3 = anode | Higher power handling suits higher-current clamping; reversed pinout requires layout revision | Select when >225 mW dissipation is needed and PCB layout can accommodate pinout swap |
| MMBZ5243BS | Identical electrical specs, but in SOD-123 package (larger, 2.7 × 1.7 mm); same 225 mW rating and 13 Ω ZZT | Greater thermal mass improves reliability in sustained overload; incompatible with SOT-23 footprints | Choose for improved thermal margin where board space allows larger discrete package |
Compared with BZX84-C13 and MMBZ5243BS, the MMBZ5243BLT1 offers optimal balance of ultra-compact size, precise 13 V regulation, and industry-standard SOT-23 pinout - making it preferred for next-gen portable designs where board area and assembly compatibility are critical.
Availability
MMBZ5243BLT1 is available at Aetrix Electronics and suitable for smartphone power management, USB interface protection, industrial sensor reference circuits, and IoT battery monitoring systems requiring stable component supply and full traceability.
Supply support for MMBZ5243BLT1 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 delivering energy-efficient silicon solutions for automotive, industrial, cloud, medical, and IoT applications.
The MMBZ52xxBLT1G series was developed specifically for high-density portable electronics, emphasizing minimal footprint, robust ESD performance, and tight Zener voltage tolerances in SOT-23 packaging.
FAQ
What is the exact Zener voltage tolerance for MMBZ5243BLT1?
The MMBZ5243BLT1 has a guaranteed Zener voltage range of 12.35 V to 13.65 V at 9.5 mA test current, representing ±5% tolerance around the nominal 13 V value. This specification is verified per onsemi's Electrical Characteristics table and applies at 25°C ambient temperature with pulse testing to minimize self-heating effects. The MMBZ5243BLT1 maintains this tolerance across its full operating temperature range.
Does MMBZ5243BLT1 have a built-in capacitor or integrated ESD structure?
No, the MMBZ5243BLT1 is a discrete silicon Zener diode with no integrated capacitor or active ESD circuitry. Its ESD robustness (>16 kV HBM) arises from optimized junction design and process-level passivation - not added components. Measured capacitance is 15 pF at 0 V bias and drops to ~5 pF at 50% of nominal VZ, confirming its purely junction-based behavior. The MMBZ5243BLT1 relies on external RC filtering if noise suppression is required.
Can MMBZ5243BLT1 be used in place of MMBZ5242BLT1 or MMBZ5244BLT1?
Yes, the MMBZ5243BLT1 is part of a tightly spaced Zener family where adjacent parts differ by ~1 V nominal voltage: MMBZ5242BLT1 is 12 V, MMBZ5243BLT1 is 13 V, and MMBZ5244BLT1 is 14 V. All share identical package (SOT-23), power rating (225 mW), pinout (Pin 1 = anode, Pin 2 = NC, Pin 3 = cathode), and thermal characteristics. Substitution is electrically valid when the target regulation voltage matches the 13 V requirement of the MMBZ5243BLT1.
What is the thermal resistance of MMBZ5243BLT1 on standard FR-5 PCB?
The MMBZ5243BLT1 has a junction-to-ambient thermal resistance (RJA) of 556 °C/W when mounted on FR-5 board per onsemi's Maximum Ratings table. This means a 225 mW power dissipation will raise junction temperature by approximately 125°C above ambient (0.225 W × 556 °C/W). Derating begins above 25°C at 1.8 mW/°C, so at 75°C ambient, maximum allowable power drops to 135 mW. This RJA value is specific to the SOT-23 footprint and FR-5 material defined in the datasheet.
Is MMBZ5243BLT1 suitable for automotive applications?
The standard MMBZ5243BLT1 is not AEC-Q101 qualified; however, its automotive-grade counterpart - SZMMBZ5243BLT1G - carries full AEC-Q101 qualification and PPAP capability. Both share identical electrical parameters and SOT-23 packaging, but only the SZ-prefix version meets automotive stress-test requirements for temperature cycling, humidity, and mechanical shock. For non-automotive industrial or consumer use, the MMBZ5243BLT1 is fully appropriate and widely deployed.
MMBZ5243BLT1 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)
MMBZ5243BLT1 FAQ
1.How can I place an order for MMBZ5243BLT1 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5243BLT1 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 MMBZ5243BLT1 reliable?
The price and inventory of MMBZ5243BLT1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBZ5243BLT1 is usually 5 days.
3.What payment methods are accepted for MMBZ5243BLT1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5243BLT1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5243BLT1?
MMBZ5243BLT1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5243BLT1 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 MMBZ5243BLT1?
For technical support, including MMBZ5243BLT1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5243BLT1 requirements.
6.How does Aetrix verify that MMBZ5243BLT1 is sourced from the original manufacturer or authorized distributors?
All MMBZ5243BLT1 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 MMBZ5243BLT1 meets industry standards.
7.What is the process for return or replacement of MMBZ5243BLT1?
All MMBZ5243BLT1 units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5243BLT1, 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 MMBZ5243BLT1 part is unused and in its original packaging.
Return procedure for MMBZ5243BLT1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MMBZ5243BLT1 Tags
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