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onsemi MMBZ5238BLT1
- Part No.:
- MMBZ5238BLT1
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBZ5238BLT1.pdf
- Description:
- DIODE ZENER 8.7V 225MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:7,215
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Product details
Overview
MMBZ5238BLT1 from onsemi is a 225 mW surface-mount Zener diode in SOT-23 package, rated for 8.7 V nominal reverse breakdown voltage at 20 mA test current, with 600 Ω maximum dynamic impedance and 3 μA maximum leakage current at 6.5 V reverse bias. It provides precision voltage regulation in space-constrained power rails for portable electronics.
For engineers reviewing the MMBZ5238BLT1 datasheet, pinout, applications, or equivalent options, this device serves as a low-power, ESD-hardened (Class 3, >16 kV HBM) voltage reference and overvoltage clamp in battery-powered systems where thermal resistance (556 °C/W on FR-5) and small footprint are critical.
Technical Context
This Zener diode operates in reverse-biased avalanche mode to maintain stable voltage across its cathode-anode terminals. Its 8.7 V nominal Zener voltage exhibits low temperature coefficient near zero crossing-typical for devices in the 8–9 V range-and supports reliable regulation under varying ambient conditions from −65 °C to +150 °C.
The SOT-23 package features a defined pinout (Pin 1: Anode, Pin 2: No Connection, Pin 3: Cathode), void-free thermosetting plastic case, UL 94 V-0 flammability rating, and 260 °C soldering tolerance for 10 seconds. It delivers 225 mW power dissipation on FR-5 board with 1.8 mW/°C derating above 25 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 8.7 V nominal at 20 mA - sets precise clamping/reference level in low-current bias networks |
| Power Dissipation (PD) | 225 mW on FR-5 board - defines maximum continuous power handling without heatsinking |
| Zener Impedance (ZZT) | 600 Ω max at IZT = 20 mA - determines regulation stiffness under load transients |
| Leakage Current (IR) | 3 μA max at VR = 6.5 V - ensures minimal quiescent current in standby or sleep modes |
| ESD Rating | Class 3 (>16 kV HBM) - enables robust operation in handheld and exposed I/O interfaces |
| Junction Temp Range | −65 °C to +150 °C - supports automotive under-hood and industrial ambient environments |
| Forward Voltage (VF) | 0.95 V max at IF = 10 mA - allows use as low-drop rectifier or polarity protection element |
Pinout & Package
SOT-23 (TO-236) package: 2.90 mm × 1.30 mm × 1.00 mm body, 1.90 mm lead pitch, Pb-free, RoHS-compliant, cathode indicated by band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode | Connected to lower-potential node in reverse-bias configuration; required for forward conduction path |
| Pin 2 | No Connection | Internally unconnected; must remain floating-no PCB trace or pad should tie to this terminal |
| Pin 3 | Cathode | Connected to higher-potential node in reverse-bias configuration; carries regulated output or clamp current |
Key Features
| Feature | Design Value |
|---|---|
| 225 mW Power Rating | Enables compact voltage regulation without external heat sinking on standard FR-5 PCBs |
| ESD Hardness Class 3 | Eliminates need for discrete ESD protection in front-end power rails of consumer portables |
| Pb-Free & RoHS Compliance | Meets global environmental compliance requirements for commercial and industrial production |
| Small SOT-23 Footprint | Reduces board area by >50% vs. DO-35 or SOD-123 packages, enabling high-density layout |
| Wide Zener Range Support | Part of MMBZ52xxBLT1G family covering 2.4 V–91 V-allows single-source procurement across designs |
Applications
| Smartphone Power Management | USB-C Port Protection |
|---|---|
|
Use Scenario: Clamping transient surges on 5 V USB power input rail during hot-plug events. IC Role / Device Role / Timing Role: Zener clamp protecting downstream LDOs and USB controller power pins. Use Value: Limits voltage to ≤9.14 V (VZ max), preventing damage while drawing <3 μA leakage at 6.5 V standby. |
Use Scenario: Providing stable 8.7 V reference for USB PD sink voltage detection circuitry. IC Role / Device Role / Timing Role: Precision shunt reference generating threshold for comparator-based VBUS monitoring. Use Value: Delivers ±0.44 V tolerance (8.26–9.14 V) at 20 mA, enabling accurate 5 V/9 V/15 V negotiation. |
| Wearable Battery Monitoring | Industrial Sensor Signal Conditioning |
|
Use Scenario: Regulating bias voltage for fuel gauge IC analog front-end in coin-cell powered wearables. IC Role / Device Role / Timing Role: Low-quiescent shunt regulator supplying clean 8.7 V reference to ADC reference buffer. Use Value: Draws only 3 μA leakage at 6.5 V, extending battery life while maintaining 600 Ω impedance for noise rejection. |
Use Scenario: Protecting 4–20 mA loop transmitter inputs from ESD and overvoltage in factory-floor sensors. IC Role / Device Role / Timing Role: Transient voltage suppressor placed across signal input and ground. Use Value: Withstands >16 kV HBM ESD and clamps fast transients to ≤9.14 V without latch-up or degradation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C8V2LT1G | 8.2 V nominal Zener, 300 mW rating, same SOT-23 package but higher power and tighter 5% tolerance | Better suited for higher-current regulation; less ideal for ultra-low-leakage standby circuits | Select when higher power margin or tighter voltage tolerance is required, not for low-IR priority designs |
| MMBZ5238BS | Same electrical specs but in SOD-123 package - larger footprint, higher thermal mass, no NC pin | Preferred for manual assembly or thermal-heavy applications; incompatible with automated SOT-23 pick-and-place | Choose only if board rework, hand-soldering, or improved thermal dissipation (300 mW on alumina) is needed |
Compared with BZX84-C8V2LT1G and MMBZ5238BS, the MMBZ5238BLT1 offers optimal balance of ultra-low leakage (3 μA), industry-standard SOT-23 automation compatibility, and proven ESD hardness-making it preferred for high-volume portable electronics where board space and reliability are co-constrained.
Availability
MMBZ5238BLT1 is available at Aetrix Electronics and suitable for smartphone power management, USB-C port protection, and wearable battery monitoring requiring stable component supply and full traceability.
Supply support for MMBZ5238BLT1 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, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The MMBZ52xxBLT1G series was designed specifically for space-constrained, low-power voltage regulation and ESD protection in portable and battery-operated electronics-emphasizing miniaturization, reliability, and manufacturability.
FAQ
What is the exact Zener voltage tolerance for MMBZ5238BLT1?
The MMBZ5238BLT1 has a guaranteed Zener voltage range of 8.26 V (min) to 9.14 V (max) at 20 mA test current, corresponding to ±5% tolerance around the 8.7 V nominal value. This tolerance is verified per onsemi's Electrical Characteristics table and applies under standard test conditions (TA = 25 °C, pulse test).
Does MMBZ5238BLT1 have a functional pin 2 connection?
No-MMBZ5238BLT1 has Pin 2 designated as "No Connection" per the official marking diagram and mechanical outline (Style 8). That terminal is internally unconnected and must remain electrically floating on the PCB; routing a trace or via to Pin 2 violates the device's validated design and may compromise reliability.
Can MMBZ5238BLT1 be used in automotive applications?
The standard MMBZ5238BLT1 is not AEC-Q101 qualified. For automotive use, the SZMMBZ5238BLT1G variant-identical electrically but with enhanced process controls, unique site traceability, and PPAP capability-must be selected. The "SZ" prefix explicitly denotes automotive-grade qualification.
What is the thermal resistance of MMBZ5238BLT1 on standard PCB?
MMBZ5238BLT1 has a junction-to-ambient thermal resistance (RJA) of 556 °C/W when mounted on an FR-5 board per onsemi's Maximum Ratings table. This value assumes standard JEDEC test conditions (1.0 × 0.75 × 0.62 inch board) and defines safe operating temperature rise at 225 mW dissipation.
Is MMBZ5238BLT1 RoHS and halogen-free compliant?
Yes-MMBZ5238BLT1 is explicitly certified Pb-free, halogen-free/BFR-free, and RoHS-compliant per onsemi's datasheet. The "G" suffix in the full part number (MMBZ5238BLT1G) denotes this compliance, and the device meets EU Directive 2011/65/EU and related environmental standards.
MMBZ5238BLT1 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):
- 8.7 V
- Tolerance:
- ±5%
- Power - Max:
- 225 mW
- Impedance (Max) (Zzt):
- 8 Ohms
- Current - Reverse Leakage @ Vr:
- 3 µA @ 6.5 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)
MMBZ5238BLT1 FAQ
1.How can I place an order for MMBZ5238BLT1 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5238BLT1 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 MMBZ5238BLT1 reliable?
The price and inventory of MMBZ5238BLT1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBZ5238BLT1 is usually 5 days.
3.What payment methods are accepted for MMBZ5238BLT1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5238BLT1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5238BLT1?
MMBZ5238BLT1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5238BLT1 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 MMBZ5238BLT1?
For technical support, including MMBZ5238BLT1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5238BLT1 requirements.
6.How does Aetrix verify that MMBZ5238BLT1 is sourced from the original manufacturer or authorized distributors?
All MMBZ5238BLT1 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 MMBZ5238BLT1 meets industry standards.
7.What is the process for return or replacement of MMBZ5238BLT1?
All MMBZ5238BLT1 units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5238BLT1, 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 MMBZ5238BLT1 part is unused and in its original packaging.
Return procedure for MMBZ5238BLT1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MMBZ5238BLT1 Tags
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