My Inquiry
My Account
Diodes Incorporated MMSZ5259B-7
- Part No.:
- MMSZ5259B-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
MMSZ5259B-7.pdf
- Description:
- DIODE ZENER 39V 500MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:7,309
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MMSZ5259B-7 from Diodes Incorporated is a 39 V, 500 mW surface-mount Zener diode in SOD-123 package, rated for 3.2 mA test current, 80 Ω dynamic impedance at 1 kHz, and 0.1 µA reverse leakage at 30 V, used for precision voltage regulation and reference in power supply feedback loops.
For engineers reviewing the MMSZ5259B-7 datasheet, MMSZ5259B-7 pinout, MMSZ5259B-7 application, or MMSZ5259B-7 equivalent, key selection criteria include nominal Zener voltage tolerance (±2.5%), thermal resistance (338 °C/W), AEC-Q101 qualification, RoHS/Green compliance, and SOD-123 footprint compatibility with automated assembly.
Technical Context
This Zener diode operates in reverse breakdown to maintain stable voltage across its terminals under varying load and temperature conditions. Its 39 V nominal Zener voltage exhibits a positive temperature coefficient of +0.08 %/°C, and it delivers regulated output with ≤80 Ω impedance at 3.2 mA test current.
The device is optimized for low-power voltage reference and overvoltage clamping in space-constrained PCBs. It supports operation from −65 °C to +150 °C, dissipates up to 370 mW at 25 °C ambient, and derates linearly above 75 °C case temperature per the published power derating curve.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (Nominal) | 39 V - precise regulation point for feedback networks and reference circuits |
| Zener Voltage Range | 37.05 V to 40.95 V - ±2.5% tolerance ensures predictable clamping threshold |
| Test Current (IZT) | 3.2 mA - standard bias condition for specifying Zener voltage and impedance |
| Zener Impedance (ZZT) | 80 Ω @ 1 kHz - low dynamic impedance enables stable regulation under small-signal variations |
| Power Dissipation (PD) | 370 mW @ TA = 25 °C - defines maximum continuous DC power in standard FR-4 layout |
| Reverse Leakage (IR) | 0.1 µA @ VR = 30 V - minimal off-state current preserves efficiency in high-impedance bias networks |
| Thermal Resistance (RθJA) | 338 °C/W - quantifies junction-to-ambient thermal path for thermal design margining |
Pinout & Package
Package: SOD-123 - compact surface-mount plastic case with cathode band marking, 0.01 g weight, UL 94V-0 flammability rating, and matte tin-plated alloy 42 leadframe.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference ground | Connected to circuit ground or lower potential node in shunt regulator configuration |
| Cathode | Reverse breakdown terminal / Zener voltage output | Connected to regulated node; voltage referenced to anode; marked by band on package |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing |
| Lead-free & RoHS compliant | Fully compliant with EU Directive 2011/65/EU; no intentionally added lead or halogens |
| SOD-123 footprint | Standardized 2.65 mm × 1.55 mm outline compatible with high-speed pick-and-place equipment |
| Low moisture sensitivity | MSL Level 1 per J-STD-020 - no dry-pack or baking required before reflow |
Applications
| Switch-Mode Power Supply Feedback | Industrial Sensor Reference |
|---|---|
Use Scenario: Provides stable 39 V reference for optocoupler-based feedback in isolated AC/DC converters. IC Role / Device Role / Timing Role: Shunt voltage reference regulating error amplifier input in secondary-side control loop. Use Value: Maintains ±2.5% output voltage accuracy across line/load/temperature with <80 Ω impedance. |
Use Scenario: Supplies precision bias voltage to bridge sensor signal conditioning circuits in factory automation modules. IC Role / Device Role / Timing Role: Low-drift voltage reference for instrumentation amplifier excitation and ADC reference scaling. Use Value: Delivers 0.1 µA leakage and +0.08 %/°C TC to minimize offset drift in 24-bit measurement systems. |
| Automotive Body Control Module Clamp | IoT Node Overvoltage Protection |
Use Scenario: Clamps transient spikes on 12 V battery rail in BCM microcontroller I/O protection networks. IC Role / Device Role / Timing Role: Transient voltage suppressor placed between MCU GPIO and power rail. Use Value: Responds within nanoseconds to >30 V transients while sustaining AEC-Q101 automotive qualification. |
Use Scenario: Protects 3.3 V LDO input in battery-powered edge nodes from accidental 24 V misconnection. IC Role / Device Role / Timing Role: Standby-mode shunt clamp activated only during fault conditions. Use Value: Draws only 0.1 µA quiescent current during normal operation, preserving battery life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX584-C39 | 39 V, ±5% tolerance, 300 mW, SOD-323 package, 100 Ω ZZT | Lower power rating and wider voltage tolerance; smaller footprint limits thermal margin | Select when board space is critical and 300 mW dissipation suffices |
| MMBZ5259BS | 39 V, ±2.5%, 300 mW, SOT-23 package, 80 Ω ZZT, dual-anode configuration | Same electrical specs but different package; dual-anode allows shared cathode in multi-rail designs | Select when dual-Zener topology or SOT-23 assembly infrastructure is preferred |
Compared with BZX584-C39 and MMBZ5259BS, MMSZ5259B-7 offers higher power handling (370 mW vs. 300 mW) and identical Zener impedance in a robust SOD-123 package optimized for automotive thermal and mechanical stress requirements.
Availability
MMSZ5259B-7 is available at Aetrix Electronics and suitable for switch-mode power supplies, industrial sensor interfaces, automotive body control modules, and IoT node protection requiring stable component supply with AEC-Q101 assurance and RoHS/Green compliance.
Supply support for MMSZ5259B-7 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
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and North America.
MMSZ5259B-7 belongs to the MMSZ52xxB series of general-purpose Zener diodes designed for medium-current voltage regulation and clamping in commercial and automotive applications where reliability, consistency, and automated assembly compatibility are essential.
FAQ
What is the maximum continuous power dissipation for MMSZ5259B-7 at 75°C case temperature?
The maximum continuous power dissipation is 500 mW at TL = +75°C, as specified in the Absolute Maximum Ratings table. This value applies when the device is mounted on a thermally enhanced substrate (e.g., large copper pad), not standard FR-4. Derating begins linearly beyond 75°C per Figure 1.
Is MMSZ5259B-7 suitable for use in automotive applications?
Yes - MMSZ5259B-7 is explicitly qualified to AEC-Q101 standards, including stress tests for temperature cycling, high-temperature reverse bias, and electrostatic discharge. The "Q" suffix denotes automotive qualification, and this part meets those requirements in SOD-123 packaging.
How does the Zener voltage temperature coefficient affect performance at 125°C ambient?
At 39 V nominal, the temperature coefficient is +0.08 %/°C (per Figure 6). Over a 100°C rise from 25°C to 125°C, Zener voltage increases by approximately 0.31 V (39 V × 0.0008 × 100), resulting in ~39.31 V regulation - well within the ±2.5% initial tolerance band.
Can MMSZ5259B-7 be used in place of MMSZ5258B (36 V) without circuit redesign?
No - substituting a 39 V Zener for a 36 V Zener alters regulation setpoint by 3 V, which exceeds typical feedback loop compensation margins. Output voltage would increase proportionally, potentially exceeding safe operating limits for downstream components unless resistor divider values are recalculated.
MMSZ5259B-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SOD-123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Voltage - Zener (Nom) (Vz):
- 39 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 80 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 30 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:
- SOD-123
MMSZ5259B-7 FAQ
1.How can I place an order for MMSZ5259B-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMSZ5259B-7 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 MMSZ5259B-7 reliable?
The price and inventory of MMSZ5259B-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMSZ5259B-7 is usually 5 days.
3.What payment methods are accepted for MMSZ5259B-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ5259B-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMSZ5259B-7?
MMSZ5259B-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMSZ5259B-7 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 MMSZ5259B-7?
For technical support, including MMSZ5259B-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ5259B-7 requirements.
6.How does Aetrix verify that MMSZ5259B-7 is sourced from the original manufacturer or authorized distributors?
All MMSZ5259B-7 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 MMSZ5259B-7 meets industry standards.
7.What is the process for return or replacement of MMSZ5259B-7?
All MMSZ5259B-7 units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ5259B-7, 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 MMSZ5259B-7 part is unused and in its original packaging.
Return procedure for MMSZ5259B-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MMSZ5259B-7 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
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
LDO regulator guide covering low dropout voltage, power dissipation, thermal design, PSRR, output noise, capacitor stability, adjustable LDO circuits, LDO vs buck converter and datasheet selection chec…
Conditional Access Module guide covering CAM meaning, CI/CI+ interface, smart card authorization, DVB security workflow, TV and set-top box compatibility, internal electronics, ESD protection, connecto…
Guide to electronic component obsolescence covering EOL risk, PCN/PDN notices, last-time buy planning, replacement options, form-fit-function validation, counterfeit risk and BOM lifecycle management.
18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…
Hall effect sensor guide covering working principle, linear and digital sensors, Arduino circuits, current sensing, speed detection, automotive applications, A3144 examples, signal filtering and datash…
Product Change Notification guide for electronic components, covering PCN meaning, PCN vs PDN/EOL, common change types, risk levels, form-fit-function review, engineering validation, BOM control, LTB/L…
A practical guide to blend door actuators, covering HVAC function, symptoms, location, AC and heater issues, reset and calibration, replacement cost, electrical diagnosis, compatibility checks, and rep…
