My Inquiry
My Account
onsemi MMBZ5234B_D87Z
- Part No.:
- MMBZ5234B_D87Z
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBZ5234B_D87Z.pdf
- Description:
- DIODE ZENER 6.2V 350MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,475
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MMBZ5234B_D87Z from Fairchild Semiconductor is a 6.2 V, ±5% tolerance Zener diode in SOT-23 package, rated for 350 mW power dissipation, 7.0 Ω dynamic impedance at 20 mA test current, and 0.9 V maximum forward voltage at 10 mA. It provides precision voltage regulation in low-power biasing, reference, and overvoltage protection circuits.
For engineers reviewing the MMBZ5234B_D87Z datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance, dynamic impedance at specified test current, reverse leakage at rated voltage, thermal stability across -55°C to +150°C, and SOT-23 footprint compatibility with automated assembly.
Technical Context
The MMBZ5234B_D87Z operates as a silicon planar Zener diode optimized for stable voltage reference generation in space-constrained designs. Its 6.2 V nominal breakdown voltage is specified at 20 mA test current, with 7.0 Ω dynamic impedance ensuring minimal output variation under load changes.
It exhibits 0.25 µA maximum reverse leakage at 5.0 V (VR), 1,000 Ω knee impedance at 0.25 mA (IZK), and maintains operation across -55°C to +150°C junction temperature range - supporting industrial and automotive ambient environments without derating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 6.2 V ±5% at IZ = 20 mA - defines precise clamping/reference level in regulator or protection circuits |
| Dynamic Impedance (ZZ) | 7.0 Ω at IZ = 20 mA - determines output voltage stability under varying load current |
| Knee Impedance (ZZK) | 1,000 Ω at IZK = 0.25 mA - indicates onset of regulation at low-current bias conditions |
| Reverse Leakage (IR) | 0.25 µA max at VR = 5.0 V - ensures minimal quiescent power loss in high-impedance sensing nodes |
| Power Dissipation (PD) | 350 mW - sets maximum continuous thermal limit in SOT-23 package without heatsinking |
| Forward Voltage (VF) | ≤0.9 V at IF = 10 mA - enables predictable anode-cathode drop in series-bias configurations |
Pinout & Package
SOT-23 surface-mount package with three terminals: Anode (Pin 1), Cathode (Pin 2), and No Connection (Pin 3). Pin 3 is internally unconnected and must remain floating per datasheet connection diagram.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode | Connects to lower-potential node; current flows into cathode during Zener conduction |
| Pin 2 | Cathode | Connects to higher-potential node; Zener breakdown occurs between cathode and anode |
| Pin 3 | No Connection | Internally unconnected; must not be soldered or tied to any net to avoid reliability risk |
Key Features
| Feature | Design Value |
|---|---|
| ±5% Zener voltage tolerance | Enables tight reference accuracy without external trimming in analog feedback paths |
| Low 7.0 Ω dynamic impedance | Minimizes output voltage deviation under ±5 mA load transients in LDO pre-regulators |
| 0.25 µA max IR at 5.0 V | Reduces error contribution in high-gain op-amp reference buffers and sensor bias networks |
| SOT-23 footprint | Supports 0.65 mm pitch reflow assembly and fits within <1.5 mm² board area for wearables/IoT nodes |
Applications
| Power Supply Reference | Overvoltage Clamp |
|---|---|
Use Scenario: Providing stable 6.2 V reference for adjustable DC-DC converter feedback divider in point-of-load regulators. IC Role / Device Role / Timing Role: Voltage reference element establishing regulated output setpoint via resistive divider network. Use Value: ±5% VZ tolerance and 7.0 Ω ZZ ensure ≤±30 mV output deviation across 10–30 mA load steps. | Use Scenario: Protecting microcontroller I/O pins from ESD-induced transients exceeding 5.5 V rail. IC Role / Device Role / Timing Role: Shunt clamping device diverting surge current when input exceeds 6.2 V breakdown threshold. Use Value: 0.25 µA IR at 5.0 V prevents signal loading; 350 mW PD handles 8 kV HBM ESD pulses with no degradation. |
| Temperature-Stable Bias | Low-Power Sensor Excitation |
Use Scenario: Generating bias current for NTC thermistor measurement circuits requiring stable excitation over -40°C to +85°C. IC Role / Device Role / Timing Role: Precision current source element using constant-voltage drop across series resistor. Use Value: 6.2 V Zener voltage drift <±0.05%/°C ensures <±1.5% bias current variation across full industrial temperature range. | Use Scenario: Supplying excitation voltage to MEMS pressure sensor bridge in battery-powered medical monitors. IC Role / Device Role / Timing Role: Low-quiescent reference source enabling sub-10 µA system sleep current. Use Value: 0.25 µA IR and 0.9 V VF allow total reference path current <2 µA at 3.3 V supply, extending battery life >30% vs. standard diodes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C6V2 | Same 6.2 V ±5%, but 10 Ω ZZ at 5 mA; 300 mW PD; SOT-23 package | Higher dynamic impedance reduces regulation accuracy in high-precision references | Select when cost sensitivity outweighs tight regulation needs and 5 mA test current suffices |
| MMBZ5234BS | Same electrical specs, but SOD-323 package (smaller footprint, lower thermal mass) | Reduced thermal time constant limits pulse energy handling in transient suppression | Select when board space is critical and peak power remains <100 mW average |
Compared with BZX84-C6V2 and MMBZ5234BS, the MMBZ5234B_D87Z offers superior regulation stability (7.0 Ω vs. 10 Ω) and higher pulse energy capability (350 mW vs. 300 mW or reduced SOD-323 thermal mass), making it preferred for precision references and moderate-duty clamping where SOT-23 mechanical robustness matters.
Availability
MMBZ5234B_D87Z is available at Aetrix Electronics and suitable for power supply reference, overvoltage clamp, and low-power sensor excitation applications requiring stable component supply, consistent parametric performance, and long-term manufacturing continuity.
Supply support for MMBZ5234B_D87Z 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
Fairchild Semiconductor was a U.S.-based semiconductor company specializing in power management, analog, and discrete components before its acquisition by ON Semiconductor in 2016.
The MMBZ5234B_D87Z belongs to the MMBZ52xxB Zener diode family, designed for compact, high-reliability voltage regulation in portable, automotive, and industrial electronics where SOT-23 mounting and tight tolerance are essential.
FAQ
What is the Zener voltage tolerance of MMBZ5234B_D87Z?
The MMBZ5234B_D87Z has a Zener voltage tolerance of ±5% at 20 mA test current, meaning its actual breakdown voltage falls between 5.89 V and 6.51 V under standard conditions. This tolerance is guaranteed per the Fairchild MMBZ5221B–MMBZ5257B datasheet Rev. A2 and applies directly to the MMBZ5234B_D87Z variant. Tight tolerance supports accurate voltage setting in feedback loops and reference circuits without calibration.
Does MMBZ5234B_D87Z have a third functional pin?
No, MMBZ5234B_D87Z is a two-terminal Zener diode. Pin 3 in its SOT-23 package is explicitly marked "NC" (No Connection) in the official datasheet connection diagram and must remain unconnected. Only Pin 1 (Anode) and Pin 2 (Cathode) participate in circuit operation; connecting Pin 3 risks internal damage or parametric shift.
What is the maximum reverse leakage current for MMBZ5234B_D87Z?
The maximum reverse leakage current (IR) for MMBZ5234B_D87Z is 0.25 µA at VR = 5.0 V, measured at TA = 25°C. This value is confirmed in the Electrical Characteristics table of the Fairchild MMBZ5221B–MMBZ5257B datasheet. Low IR ensures minimal parasitic loading in high-impedance reference and sensing nodes where leakage could introduce offset errors.
Can MMBZ5234B_D87Z be used in automotive applications?
Yes, MMBZ5234B_D87Z supports automotive applications due to its -55°C to +150°C operating junction temperature range and qualification under Fairchild's industrial-grade reliability standards. Its 350 mW power rating and stable 6.2 V Zener voltage enable use in engine control module voltage supervisors and infotainment system ESD clamps, provided board-level thermal design maintains TJ ≤ 150°C.
How does the dynamic impedance of MMBZ5234B_D87Z affect regulation performance?
The dynamic impedance (ZZ) of MMBZ5234B_D87Z is 7.0 Ω at IZ = 20 mA, directly determining how much its output voltage varies with load current changes. For example, a ±2 mA change in Zener current causes only ±14 mV output shift - critical for maintaining accuracy in precision references. This low ZZ value is significantly better than alternatives like BZX84-C6V2 (10 Ω), making MMBZ5234B_D87Z preferable where regulation stability is prioritized.
MMBZ5234B_D87Z 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):
- 6.2 V
- Tolerance:
- ±5%
- Power - Max:
- 350 mW
- Impedance (Max) (Zzt):
- 7 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 4 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
MMBZ5234B_D87Z FAQ
1.How can I place an order for MMBZ5234B_D87Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5234B_D87Z 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 MMBZ5234B_D87Z reliable?
The price and inventory of MMBZ5234B_D87Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBZ5234B_D87Z is usually 5 days.
3.What payment methods are accepted for MMBZ5234B_D87Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5234B_D87Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5234B_D87Z?
MMBZ5234B_D87Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5234B_D87Z 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 MMBZ5234B_D87Z?
For technical support, including MMBZ5234B_D87Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5234B_D87Z requirements.
6.How does Aetrix verify that MMBZ5234B_D87Z is sourced from the original manufacturer or authorized distributors?
All MMBZ5234B_D87Z 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 MMBZ5234B_D87Z meets industry standards.
7.What is the process for return or replacement of MMBZ5234B_D87Z?
All MMBZ5234B_D87Z units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5234B_D87Z, 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 MMBZ5234B_D87Z part is unused and in its original packaging.
Return procedure for MMBZ5234B_D87Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MMBZ5234B_D87Z 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…
