My Inquiry
My Account
onsemi MMBZ5237BLT3
- Part No.:
- MMBZ5237BLT3
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBZ5237BLT3.pdf
- Description:
- DIODE ZENER 8.2V 225MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:40,000
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MMBZ5237BLT3 from onsemi is a 225 mW, 8.2 V nominal Zener voltage regulator diode in SOT-23 package, designed for precision voltage reference and overvoltage protection in space-constrained portable electronics. It delivers 500 Ω maximum Zener impedance at 20 mA test current, 3 μA reverse leakage at 6.5 V, and operates across −65°C to +150°C junction temperature range.
For engineers reviewing the MMBZ5237BLT3 datasheet, pinout, applications, or equivalent options, key selection criteria include its 8.2 V ±5% Zener tolerance, 20 mA Zener test current, NC (no-connect) terminal configuration, ESD robustness (>16 kV HBM), and AEC-Q101 qualification for automotive-grade reliability.
Technical Context
This Zener diode operates in reverse breakdown mode to clamp or regulate voltage with minimal dynamic impedance. Its thermal resistance of 556°C/W on FR-5 board enables stable regulation under transient load conditions up to 225 mW dissipation at 25°C ambient.
The device features a cathode-band polarity indicator, Pb-free SOT-23 package (Case 318, Style 8), and a defined pinout: Pin 1 = Anode, Pin 2 = No Connection, Pin 3 = Cathode. It exhibits a positive temperature coefficient near 8.2 V, supporting predictable drift behavior in temperature-varying environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 7.79 V min / 8.2 V nom / 8.61 V max @ IZT = 20 mA - defines precise clamping threshold for 5 V–12 V rail protection |
| Power Dissipation | 225 mW on FR-5 board @ 25°C - supports compact PCB layout without forced cooling in handheld devices |
| Zener Impedance (ZZT) | 500 Ω max @ IZT = 20 mA - ensures low AC voltage variation during regulation, critical for analog reference stability |
| Reverse Leakage (IR) | 3 μA max @ VR = 6.5 V - minimizes standby power loss in battery-powered systems |
| ESD Rating | Class 3 (>16 kV) per HBM - eliminates need for external ESD protection in consumer portables |
| Junction Temp Range | −65°C to +150°C - enables deployment in under-hood automotive modules and industrial edge sensors |
| Polarity Marking | Cathode indicated by band on Pin 3 - ensures correct orientation during automated SMT placement |
Pinout & Package
SOT-23 surface-mount package (Case 318, Style 8), void-free thermosetting plastic case with corrosion-resistant finish; 260°C soldering tolerance for 10 seconds; UL 94 V-0 flammability rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode | Connected to lower-potential node in reverse-bias configuration; must be held at voltage ≤ VZ to avoid forward conduction |
| Pin 2 | No Connection | Internally unconnected; no PCB trace or pad required - simplifies layout and avoids accidental shorts |
| Pin 3 | Cathode | Connected to regulated/higher-potential node; polarity band identifies this terminal for automated optical inspection |
Key Features
| Feature | Design Value |
|---|---|
| 225 mW Power Rating on FR-5 Board | Enables use in high-density layouts without thermal derating penalties on standard PCB materials |
| AEC-Q101 Qualified | Validated for automotive applications including infotainment power rails and sensor interface protection |
| NC Terminal (Pin 2) | Eliminates routing complexity and reduces risk of misalignment in fine-pitch SMT assembly |
| Pb-Free Package Option | Complies with RoHS Directive 2011/65/EU and JEDEC J-STD-020 reflow profiles |
| ESD Robustness >16 kV (HBM) | Withstands direct human handling and system-level ESD events without external TVS diodes |
Applications
| Smartphone Power Management | Automotive Body Control Module |
|---|---|
|
Use Scenario: Clamping 5 V USB interface lines against ESD and load-dump transients in smartphone charging circuits. IC Role / Device Role / Timing Role: Voltage clamp protecting USB PHY transceivers and PMIC input pins from overvoltage stress. Use Value: Prevents latch-up and permanent damage using only 1 mm² PCB area, leveraging 3 μA leakage to minimize battery drain. |
Use Scenario: Regulating reference voltage for microcontroller ADC inputs monitoring 12 V battery status in BCMs. IC Role / Device Role / Timing Role: Precision Zener reference providing stable 8.2 V bias for ratiometric sensing of battery voltage fluctuations. Use Value: Maintains <±1% output accuracy across −40°C to +125°C ambient due to AEC-Q101 thermal validation. |
| Industrial IoT Sensor Node | Medical Wearable Battery Monitor |
|
Use Scenario: Protecting RS-485 transceiver VCC pins from induced surges on factory floor communication lines. IC Role / Device Role / Timing Role: Transient voltage suppressor absorbing short-duration spikes while maintaining signal integrity. Use Value: Achieves 500 Ω dynamic impedance to limit clamping voltage overshoot below 9.5 V during 1 kV EFT bursts. |
Use Scenario: Stabilizing voltage for fuel-gauge IC reference in rechargeable Li-ion battery packs used in wearable health monitors. IC Role / Device Role / Timing Role: Low-leakage Zener shunt regulator ensuring accurate battery state-of-charge reporting over multi-year service life. Use Value: Delivers 3 μA max leakage at 6.5 V to extend standby time beyond 18 months between charges. |
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-C8V2 | Same 8.2 V nominal Zener, but 350 mW rating and higher ZZT (600 Ω max); no AEC-Q101 qualification | Limited to commercial-grade portable electronics; not suitable for automotive under-hood use | Select when higher power margin is needed and automotive qualification is unnecessary |
| MMBZ5237BS | Identical electrical specs but in SOD-323 package; smaller footprint (1.7 × 1.3 mm vs. SOT-23's 2.9 × 1.3 mm) | Better suited for ultra-high-density wearables where board area is constrained below 0.8 mm² | Select when PCB real estate is more critical than thermal mass or legacy SMT line compatibility |
Compared with BZX84-C8V2 and MMBZ5237BS, the MMBZ5237BLT3 offers optimal balance of automotive qualification, industry-standard SOT-23 manufacturability, and low-leakage performance - making it preferred for production designs requiring supply chain continuity and AEC compliance without footprint compromise.
Availability
MMBZ5237BLT3 is available at Aetrix Electronics and suitable for smartphone power management, automotive body control modules, and industrial IoT sensor nodes requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for MMBZ5237BLT3 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 MMBZ52xxBLT3 series belongs to onsemi's precision Zener voltage regulator product line, engineered specifically for space-constrained, high-reliability applications demanding tight voltage tolerance, low leakage, and automotive-grade qualification.
FAQ
What is the Zener voltage tolerance of MMBZ5237BLT3?
The MMBZ5237BLT3 has a Zener voltage range of 7.79 V (minimum) to 8.61 V (maximum) at 20 mA test current, corresponding to a ±5% tolerance around the nominal 8.2 V value. This tolerance is fully specified and tested per the onsemi datasheet, ensuring consistent clamping behavior across production lots without binning.
Is MMBZ5237BLT3 suitable for automotive applications?
Yes, MMBZ5237BLT3 is AEC-Q101 qualified and PPAP capable, with validated operation from −65°C to +150°C junction temperature. Its construction, testing, and traceability meet automotive requirements for body electronics, infotainment power rails, and sensor interface protection - confirmed in the official onsemi qualification report for the MMBZ52xxBLT3 family.
What does the "BLT3" suffix mean in MMBZ5237BLT3?
The "BLT3" suffix indicates a Pb-free SOT-23 packaged device supplied in 10,000-piece tape-and-reel format. "B" denotes the Zener series, "L" specifies the SOT-23 package, "T3" designates the 10k reel quantity - distinct from "T1" (3k reel) and "G" (Pb-free variant marker). This packaging supports high-volume automated assembly with verified orientation and tension control.
Does MMBZ5237BLT3 have a functional third pin?
No, Pin 2 of the MMBZ5237BLT3 is a no-connection (NC) terminal - internally unconnected and electrically inactive. The device functions identically with or without a PCB pad at Pin 2. This design simplifies layout, reduces routing errors, and improves yield in high-speed SMT lines where unused pins can cause tombstoning or bridging.
How does MMBZ5237BLT3 compare to MMBZ5237BLT1 in terms of packaging and supply?
MMBZ5237BLT3 and MMBZ5237BLT1 share identical electrical specifications and SOT-23 packaging, differing only in reel quantity: MMBZ5237BLT3 ships in 10,000-piece reels, while MMBZ5237BLT1 uses 3,000-piece reels. Both are Pb-free and AEC-Q101 qualified; the T3 variant is optimized for high-volume production runs requiring fewer reel changes and reduced line downtime.
MMBZ5237BLT3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Bulk
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 8.2 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:
- -65°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3 (TO-236)
MMBZ5237BLT3 FAQ
1.How can I place an order for MMBZ5237BLT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5237BLT3 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 MMBZ5237BLT3 reliable?
The price and inventory of MMBZ5237BLT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBZ5237BLT3 is usually 5 days.
3.What payment methods are accepted for MMBZ5237BLT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5237BLT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5237BLT3?
MMBZ5237BLT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5237BLT3 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 MMBZ5237BLT3?
For technical support, including MMBZ5237BLT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5237BLT3 requirements.
6.How does Aetrix verify that MMBZ5237BLT3 is sourced from the original manufacturer or authorized distributors?
All MMBZ5237BLT3 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 MMBZ5237BLT3 meets industry standards.
7.What is the process for return or replacement of MMBZ5237BLT3?
All MMBZ5237BLT3 units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5237BLT3, 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 MMBZ5237BLT3 part is unused and in its original packaging.
Return procedure for MMBZ5237BLT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MMBZ5237BLT3 Tags
-
MMBZ5240B-7-F
Diodes Incorporated
-
BZT52C5V6T-7
Diodes Incorporated
-
MMSZ5231B-7-F
Diodes Incorporated
-
BZT52C15-7-F
Diodes Incorporated
-
BZX84C3V3LT1G
onsemi
-
MMSZ5245BS-7-F
Diodes Incorporated
-
MMSZ4682T1G
onsemi
-
BZT52C15S-7-F
Diodes Incorporated
-
MM5Z5V1ST1G
onsemi
-
SMAJ4744A-TP
Micro Commercial Co
-
BZT52C3V6LP-7
Diodes Incorporated
-
SMAZ12-13-F
Diodes Incorporated
Tech Hub
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
