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onsemi MMBZ5243ELT1G
- Part No.:
- MMBZ5243ELT1G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBZ5243ELT1G.pdf
- Description:
- DIODE ZENER 13V 225MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,509
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Product details
Overview
MMBZ5243ELT1G from onsemi is a 13 V, 225 mW surface-mount Zener diode in SOT-23 package, with 9.5 mA test current (IZT), 13 Ω dynamic impedance (ZZT), and 0.5 μA leakage current at 9.9 V reverse bias. It provides precision voltage regulation in space-constrained power rails for portable electronics and high-density PCBs.
For engineers reviewing the MMBZ5243ELT1G datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance (±5% nominal), thermal resistance (556 °C/W on FR-5), ESD rating (>16 kV HBM), and NC pin isolation in the SOT-23 footprint.
Technical Context
This device operates as a two-terminal voltage reference using avalanche breakdown in silicon PN junction. Its 13 V nominal Zener voltage falls within the positive temperature coefficient range above 5 V, ensuring stable regulation across −65°C to +150°C junction temperatures.
The SOT-23 package features Pin 1 (Anode), Pin 2 (No Connection), and Pin 3 (Cathode), with polarity indicated by a band on the cathode side. Peak pulse power handling reaches 225 W (8 × 20 μs), supporting transient overvoltage clamping in low-energy protection circuits.
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 under standard test conditions |
| Power Dissipation (PD) | 225 mW on FR-5 board @ TA = 25°C - sets maximum continuous DC power handling in typical PCB layout |
| Zener Impedance (ZZT) | 13 Ω @ IZT = 9.5 mA - determines output voltage deviation under load current variation |
| Leakage Current (IR) | 0.5 μA @ VR = 9.9 V - specifies off-state conduction level below breakdown threshold |
| ESD Rating | Class 3 (>16 kV) per Human Body Model - ensures robustness during automated assembly and field handling |
| Junction Temperature Range | −65°C to +150°C - supports operation in automotive under-hood and industrial environments |
Pinout & Package
SOT-23 (TO-236) package: 2.90 mm × 1.30 mm × 1.00 mm body, Pb-free, void-free thermosetting plastic case with corrosion-resistant finish. Cathode identified by polarity band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | Connected to lower-potential side of regulated rail; reverse-biased during Zener operation |
| 2 | No Connection | Internally isolated terminal; must remain unconnected on PCB to avoid parasitic coupling |
| 3 | Cathode | Connected to higher-potential side; polarity band marks this terminal for orientation verification |
Key Features
| Feature | Design Value |
|---|---|
| 225 mW power rating on FR-5 board | Enables use in compact DC-DC feedback networks without external heat sinking |
| ESD rating >16 kV (HBM) | Eliminates need for additional ESD protection in handheld device front-end circuits |
| Pb-free and RoHS-compliant packaging | Meets global environmental compliance requirements for consumer and industrial shipments |
| Peak pulse power: 225 W (8 × 20 μs) | Provides transient suppression capability for EFT and surge events in IEC 61000-4-4 testing |
Applications
| Portable Power Management | Automotive Body Control Module |
|---|---|
|
Use Scenario: Voltage reference for Li-ion battery charge controller IC feedback loop in Bluetooth earbuds. IC Role / Device Role / Timing Role: Zener diode provides stable 13 V reference to comparator input for overvoltage cutoff. Use Value: Tight 13 V ±0.65 V tolerance ensures accurate battery termination at 4.35 V per cell without calibration. |
Use Scenario: Overvoltage clamp on 12 V supply rail feeding microcontroller I/O pins in door module. IC Role / Device Role / Timing Role: Shunts excess energy during load dump transients to protect 3.3 V LDO input stage. Use Value: 225 W peak pulse rating absorbs 8 × 20 μs surges up to ISO 7637-2 Pulse 5a without degradation. |
| Industrial Sensor Signal Conditioning | Medical Wearable Reference Circuit |
|
Use Scenario: Precision biasing of op-amp input stage in 4–20 mA transmitter for pressure sensor. IC Role / Device Role / Timing Role: Supplies stable 13 V rail to instrumentation amplifier, reducing gain drift vs. temperature. Use Value: 556 °C/W thermal resistance maintains <1°C junction rise at 150 mW dissipation, minimizing TC-induced error. |
Use Scenario: Low-noise voltage reference for ADC reference buffer in glucose monitor analog front end. IC Role / Device Role / Timing Role: Regulates 13 V supply to REF3012 voltage reference IC, improving PSRR performance. Use Value: 0.5 μA leakage at 9.9 V ensures <1 LSB error contribution in 12-bit medical-grade conversion. |
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 | 13 V ±5%, 300 mW rating, same SOT-23 package but 20 mA IZT, 30 Ω ZZT | Higher power margin but looser impedance control; less suitable for precision feedback loops | Select when higher continuous power headroom is needed and 30 Ω ZZT is acceptable |
| MMBZ5243BS | Same electrical specs but SOD-123 package (3.7 × 1.6 × 1.1 mm); no NC pin | Larger footprint, no unused terminal - better for manual rework but occupies 2.5× more board area | Select when SOD-123 compatibility is required or NC pin routing poses layout constraints |
Compared with MMBZ5243ELT1G, BZX84-C13LT1G trades tighter Zener impedance for higher power, while MMBZ5243BS eliminates the NC pin at the cost of increased PCB real estate - both require validation of thermal derating and layout impact in high-density designs.
Availability
MMBZ5243ELT1G is available at Aetrix Electronics and suitable for portable electronics, automotive body electronics, and industrial sensor signal conditioning requiring stable component supply and full traceability.
Supply support for MMBZ5243ELT1G 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 is a global semiconductor supplier delivering energy-efficient silicon solutions for automotive, industrial, cloud, medical, and IoT applications.
The MMBZ52xxELT1G series targets space-constrained voltage regulation in portable and high-density systems, emphasizing low-profile packaging, high ESD immunity, and tight Zener tolerances for precision analog functions.
FAQ
What is the Zener voltage tolerance of MMBZ5243ELT1G?
The MMBZ5243ELT1G has a Zener voltage range of 12.35 V to 13.65 V at IZT = 9.5 mA, corresponding to ±5% tolerance around the nominal 13 V rating. This tolerance is guaranteed across the full operating temperature range and reflects manufacturing process control, not test condition variance.
Does MMBZ5243ELT1G have a functional third pin?
No - Pin 2 of the MMBZ5243ELT1G is explicitly designated "No Connection" in the datasheet and mechanical drawings. It is internally isolated and must remain unconnected on the PCB; routing or soldering to this terminal may cause unpredictable leakage or thermal behavior.
Can MMBZ5243ELT1G be used for transient voltage suppression?
Yes - the MMBZ5243ELT1G supports 225 W peak pulse power (8 × 20 μs), making it suitable for low-energy transient clamping such as EFT and minor load dump events. However, it is not rated for high-energy surges like lightning or AC line transients, where dedicated TVS diodes are preferred.
What is the thermal resistance of MMBZ5243ELT1G on standard FR-5 PCB?
The junction-to-ambient thermal resistance (RJA) of MMBZ5243ELT1G is 556 °C/W when mounted on an FR-5 board per the datasheet's defined test board (1.0 × 0.75 × 0.62 in). This value assumes no copper pour or thermal vias; adding 1 cm² of 2 oz copper on layer 2 reduces RJA by ~120 °C/W.
Is MMBZ5243ELT1G compliant with automotive qualification standards?
No - MMBZ5243ELT1G is not AEC-Q101 qualified. For automotive applications, the SZMMBZ5243ELT1G variant (same electrical specs, marked with "SZ" prefix) is AEC-Q101 qualified and PPAP capable, with controlled manufacturing site and change management per automotive requirements.
MMBZ5243ELT1G 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)
MMBZ5243ELT1G FAQ
1.How can I place an order for MMBZ5243ELT1G through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5243ELT1G 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 MMBZ5243ELT1G reliable?
The price and inventory of MMBZ5243ELT1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBZ5243ELT1G is usually 5 days.
3.What payment methods are accepted for MMBZ5243ELT1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5243ELT1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5243ELT1G?
MMBZ5243ELT1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5243ELT1G 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 MMBZ5243ELT1G?
For technical support, including MMBZ5243ELT1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5243ELT1G requirements.
6.How does Aetrix verify that MMBZ5243ELT1G is sourced from the original manufacturer or authorized distributors?
All MMBZ5243ELT1G 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 MMBZ5243ELT1G meets industry standards.
7.What is the process for return or replacement of MMBZ5243ELT1G?
All MMBZ5243ELT1G units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5243ELT1G, 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 MMBZ5243ELT1G part is unused and in its original packaging.
Return procedure for MMBZ5243ELT1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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