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onsemi MMBZ5240ELT1G
- Part No.:
- MMBZ5240ELT1G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBZ5240ELT1G.pdf
- Description:
- DIODE ZENER 10V 225MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,981
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Product details
Overview
MMBZ5240ELT1G from onsemi is a 10 V, 225 mW surface-mount Zener diode in SOT-23 package, designed for precision voltage regulation and transient suppression in space-constrained circuits. It delivers nominal Zener voltage of 10.0 V at 20 mA test current, with dynamic impedance of 17 Ω at IZT, leakage current ≤0.25 µA at 8 V reverse bias, and ESD rating >16 kV (HBM). It is used in voltage reference circuits for portable power management ICs.
For engineers reviewing the MMBZ5240ELT1G datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance (±5%), thermal resistance (556 °C/W on FR-5), peak pulse power (225 W), and Pb-free SOT-23 compatibility with automated assembly.
Technical Context
This device operates as a two-terminal voltage reference using avalanche breakdown in silicon PN junction. Its 10 V nominal Zener voltage places it in the medium-voltage range where temperature coefficient is near zero (≈+2 mV/°C), minimizing drift over −65°C to +150°C operating range. The 225 mW DC power rating is derated linearly above 25°C ambient at 1.8 mW/°C on FR-5 board.
The SOT-23 package features three terminals: Pin 1 (Anode), Pin 2 (No Connection), Pin 3 (Cathode), with cathode polarity marked by band. Its 2.90 × 1.30 × 1.00 mm footprint supports high-density PCB layouts, and UL 94 V-0 flammability rating ensures compliance in consumer and industrial end equipment.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 9.5–10.5 V at 20 mA - tight ±5% tolerance enables stable reference without trimming. |
| Power Dissipation (PD) | 225 mW on FR-5 board - defines maximum continuous DC power before thermal shutdown risk. |
| Zener Impedance (ZZT) | 17 Ω at IZT = 20 mA - low dynamic resistance ensures minimal output voltage variation under load changes. |
| Reverse Leakage (IR) | ≤0.25 µA at VR = 8 V - guarantees negligible standby current in battery-powered systems. |
| ESD Rating | Class 3 (>16 kV HBM) - protects against electrostatic discharge during handling and board assembly. |
| Thermal Resistance (RJA) | 556 °C/W on FR-5 - determines junction temperature rise per watt; critical for reliability in sealed enclosures. |
| Peak Pulse Power | 225 W (8 × 20 µs) - supports transient surge suppression in I/O line protection applications. |
Pinout & Package
SOT-23 (TO-236) package: 2.90 mm × 1.30 mm × 1.00 mm, void-free thermosetting plastic case, Pb-free, UL 94 V-0 rated, cathode indicated by band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | Connected to lower-potential node; forward-biased when VANODE > VCATHODE by ≥0.95 V. |
| 2 | No Connection | Internally unconnected; must remain floating-no PCB trace or pad required. |
| 3 | Cathode | Connected to higher-potential node; Zener breakdown occurs when reverse voltage exceeds VZ. |
Key Features
| Feature | Design Value |
|---|---|
| 225 mW DC power rating | Enables use in compact voltage references without external heat sinking on standard FR-5 PCBs. |
| 10 V nominal Zener voltage | Matches common logic supply rails (e.g., 10 V analog sections), reducing need for additional regulators. |
| 17 Ω Zener impedance at 20 mA | Delivers <10 mV output shift across 1–20 mA load range-critical for ADC reference stability. |
| ESD rating >16 kV (HBM) | Eliminates need for external ESD protection in handheld device front-end circuits. |
| Pb-free SOT-23 packaging | Ensures RoHS compliance and compatibility with lead-free reflow profiles (260°C/10 s max). |
Applications
| Portable Power Monitor Reference | USB-C Port Overvoltage Clamp |
|---|---|
|
Use Scenario: Provides stable 10 V reference for ADC measuring Li-ion battery pack voltage in Bluetooth earbuds. IC Role / Device Role / Timing Role: Two-terminal shunt voltage reference establishing precise measurement baseline. Use Value: ±5% VZ tolerance and 17 Ω ZZT ensure <±5 mV reference error across 0–20 mA sensor bias current. |
Use Scenario: Clamps transient surges on USB-C CC lines during hot-plug events in docking stations. IC Role / Device Role / Timing Role: Fast-response shunt protector absorbing 8×20 µs pulses up to 225 W. Use Value: 225 W peak pulse rating and >16 kV HBM withstand capability prevent interface IC damage without added TVS. |
| Industrial Sensor Signal Conditioning | Automotive Body Control Module (BCM) Bias Supply |
|
Use Scenario: Stabilizes excitation voltage for 4–20 mA loop-powered pressure transmitters in factory automation. IC Role / Device Role / Timing Role: Low-drift Zener reference maintaining constant current source accuracy. Use Value: Near-zero TC (~+2 mV/°C) and −65°C to +150°C operation ensure <0.1% full-scale drift over environmental range. |
Use Scenario: Generates local 10 V bias for LIN transceiver and microcontroller I/O in automotive door modules. IC Role / Device Role / Timing Role: Compact, AEC-Q101 qualified voltage clamp/regulator for 12 V rail conditioning. Use Value: SZ-prefix variant available; this MMBZ5240ELT1G meets same thermal and ESD specs for non-automotive BCM derivatives. |
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-C10LT1G | Same 10 V nominal VZ, but 350 mW PD, 20 Ω ZZT, and 500 mW peak pulse rating. | Higher power dissipation suits higher-current reference designs; larger thermal footprint may limit density. | Select when >225 mW continuous regulation is needed and board area allows slightly larger thermal margin. |
| MMBZ5240BS | Same electrical specs, but SOD-123 package (3.7 × 1.6 × 1.1 mm) with 2-pin configuration (anode/cathode only). | No NC pin simplifies layout; higher RJA (625 °C/W) reduces power handling on same board material. | Choose for simplified routing and cost-sensitive designs where 225 mW derating is acceptable and NC pin is unnecessary. |
Compared with BZX84-C10LT1G and MMBZ5240BS, the MMBZ5240ELT1G offers optimal balance of ultra-compact SOT-23 size, industry-standard 225 mW rating, and guaranteed 17 Ω ZZT, making it preferred for high-density portable and embedded reference circuits where pin count and footprint are constrained.
Availability
MMBZ5240ELT1G is available at Aetrix Electronics and suitable for portable power monitoring, USB interface protection, industrial sensor signal conditioning, and automotive body control module biasing requiring stable component supply and RoHS-compliant sourcing.
Supply support for MMBZ5240ELT1G 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 (Semiconductor Components Industries, LLC) is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The MMBZ52xxELT1G series belongs to onsemi's precision Zener regulator product line, engineered for space-constrained voltage reference and clamping in portable, high-density, and mission-critical electronic systems.
FAQ
What is the Zener voltage tolerance of MMBZ5240ELT1G?
The MMBZ5240ELT1G has a Zener voltage range of 9.5 V to 10.5 V at 20 mA test current, corresponding to a ±5% tolerance around the nominal 10.0 V rating. This tolerance is specified under TA = 25°C and is confirmed in the Electrical Characteristics table on page 2 of the official onsemi datasheet. The MMBZ5240ELT1G maintains this specification across its full operating temperature range when applied within derated power limits.
Does MMBZ5240ELT1G have a functional third pin?
No, Pin 2 of the MMBZ5240ELT1G is internally not connected (NC) and must remain unconnected on the PCB. The device functions exclusively as a two-terminal Zener diode between Pin 1 (Anode) and Pin 3 (Cathode), as explicitly defined in the Pinout section (Style 8) of the onsemi mechanical drawings and Electrical Characteristics table. Using Pin 2 risks assembly defects or unintended parasitic coupling.
Can MMBZ5240ELT1G be used for transient voltage suppression?
Yes, the MMBZ5240ELT1G supports transient suppression with a rated peak pulse power of 225 W for 8 × 20 µs waveforms, as specified in the Maximum Ratings table. Its low Zener impedance (17 Ω) and fast response enable effective clamping of short-duration surges, though it is not optimized for repetitive high-energy transients like dedicated TVS diodes. For single-event overvoltage protection in low-power interfaces, the MMBZ5240ELT1G performs reliably.
What is the thermal resistance of MMBZ5240ELT1G on standard PCB material?
The MMBZ5240ELT1G has a junction-to-ambient thermal resistance (RJA) of 556 °C/W when mounted on an FR-5 board, per the Maximum Ratings table. This value assumes standard 1.0 × 0.75 × 0.62 inch board dimensions and defines the temperature rise per watt of dissipated power. Derating begins at 1.8 mW/°C above 25°C ambient, meaning usable power drops to ~189 mW at 70°C ambient.
Is MMBZ5240ELT1G compliant with automotive qualification standards?
The base MMBZ5240ELT1G is not AEC-Q101 qualified; however, its automotive-grade counterpart SZMMBZ5240ELT1G is fully AEC-Q101 qualified and PPAP capable, sharing identical electrical and thermal specifications. Both parts use the same SOT-23 package and Pb-free construction. Designers targeting automotive applications should specify the SZ-prefix version to meet qualification requirements while retaining full form-fit-function compatibility with the MMBZ5240ELT1G.
MMBZ5240ELT1G 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):
- 10 V
- Tolerance:
- ±5%
- Power - Max:
- 225 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:
- SOT-23-3 (TO-236)
MMBZ5240ELT1G FAQ
1.How can I place an order for MMBZ5240ELT1G through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5240ELT1G 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 MMBZ5240ELT1G reliable?
The price and inventory of MMBZ5240ELT1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBZ5240ELT1G is usually 5 days.
3.What payment methods are accepted for MMBZ5240ELT1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5240ELT1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5240ELT1G?
MMBZ5240ELT1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5240ELT1G 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 MMBZ5240ELT1G?
For technical support, including MMBZ5240ELT1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5240ELT1G requirements.
6.How does Aetrix verify that MMBZ5240ELT1G is sourced from the original manufacturer or authorized distributors?
All MMBZ5240ELT1G 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 MMBZ5240ELT1G meets industry standards.
7.What is the process for return or replacement of MMBZ5240ELT1G?
All MMBZ5240ELT1G units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5240ELT1G, 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 MMBZ5240ELT1G part is unused and in its original packaging.
Return procedure for MMBZ5240ELT1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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