My Inquiry
My Account
Diodes Incorporated DFLZ33-7
- Part No.:
- DFLZ33-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- POWERDI®123
- Datasheet:
-
DFLZ33-7.pdf
- Description:
- DIODE ZENER 33V 1W POWERDI 123
- Quantity:
- Payment:
- Shipping:
Inventory:37,001
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
DFLZ33-7 from Diodes Incorporated is a 1.0W surface-mount power Zener diode in PowerDI123 package, providing precise 33V nominal zener voltage (±3.0V tolerance) at 25mA test current, with 5Ω maximum zener impedance and 24µA maximum reverse leakage at 25.4V, used for overvoltage protection and voltage regulation in DC power rails.
For engineers reviewing the DFLZ33-7 datasheet, DFLZ33-7 pinout, DFLZ33-7 application, or DFLZ33-7 equivalent, key selection criteria include zener voltage accuracy, thermal resistance (9°C/W junction-to-solder point), power derating above +25°C, and automotive-grade reliability qualification per AEC-Q standards.
Technical Context
This Zener diode operates in reverse breakdown mode to clamp transient overvoltages and stabilize reference voltages. It exhibits a positive temperature coefficient of +0.06%/°C and maintains stable regulation across -55°C to +150°C operating range.
Designed for high-reliability PCB mounting, it delivers 1.0W dissipation on FR-4 with 2 oz. copper and specified pad layout, and features matte tin-annealed terminals solderable per MIL-STD-202 Method 208.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 33V nominal, 31–35V min/max at IZT = 25mA - defines clamping threshold for protection circuits |
| Power Dissipation (PD) | 1.0W at TA = +25°C - sets maximum continuous steady-state energy handling on standard FR-4 PCB |
| Zener Impedance (ZZT) | ≤5Ω max at IZT = 25mA - ensures low dynamic resistance for tight regulation under load variation |
| Reverse Leakage (IR) | ≤24µA at VR = 25.4V - guarantees minimal quiescent current in standby voltage-reference applications |
| Thermal Resistance (RθJS) | 9°C/W - enables accurate thermal modeling from die to solder joint for reliability prediction |
| Temperature Coefficient | +0.06%/°C - quantifies zener voltage drift with ambient temperature change |
Pinout & Package
Package: PowerDI123 - surface-mount plastic package with cathode band marking, 0.01g mass, UL 94V-0 rated molding compound, and moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference node | Connected to lower-potential side of regulated rail; forms reference ground for clamping path |
| Cathode | Reverse-bias input / Zener breakdown terminal | Connected to protected node; conducts during overvoltage events to shunt excess current |
| Cathode Band | Visual polarity indicator | White or black band on package top surface identifies cathode terminal for correct PCB orientation |
Key Features
| Feature | Design Value |
|---|---|
| 1.0W power rating on FR-4 | Enables robust overvoltage suppression without heatsinking in space-constrained industrial PCBs |
| AEC-Q qualified reliability | Validated for automotive-grade operation including thermal cycling, humidity, and mechanical shock |
| Lead-free, halogen-free "Green" construction | Complies with RoHS 3 (2015/863/EU) and meets strict environmental compliance for global OEM programs |
| Cathode-band polarity marking | Eliminates assembly errors during automated placement by providing unambiguous visual terminal identification |
Applications
| Industrial Power Supply Protection | Automotive ECU Voltage Reference |
|---|---|
Use Scenario: Clamping transient spikes on 24V DC bus in PLC I/O modules during relay switching or inductive load turn-off. IC Role / Device Role / Timing Role: Zener diode acting as shunt overvoltage protector, conducting only when bus exceeds 33V threshold. Use Value: Prevents damage to downstream 3.3V/5V LDOs and microcontrollers by limiting peak voltage to ≤35V with <5Ω dynamic impedance. |
Use Scenario: Providing stable 33V reference for analog sensor excitation in engine control units under wide temperature variation. IC Role / Device Role / Timing Role: Precision voltage reference element with +0.06%/°C TC, mounted directly on ECU PCB near sensor interface. Use Value: Maintains ±3% voltage stability from -40°C to +125°C, enabling accurate pressure/temperature sensor calibration without external compensation. |
| Telecom Line Card Surge Suppression | Medical Equipment Power Rail Clamp |
Use Scenario: Protecting Ethernet PHY interface power pins against ESD and lightning-induced surges in outdoor base station line cards. IC Role / Device Role / Timing Role: Fast-response shunt clamp placed adjacent to connector entry point, absorbing 1kV/1.2×50µs transients. Use Value: Limits clamping voltage to 35V within 10ns, staying below IC absolute maximum ratings while surviving >1000 surge events per IEC 61000-4-5. |
Use Scenario: Safeguarding isolated 33V auxiliary supply in patient-monitoring devices against internal fault conditions. IC Role / Device Role / Timing Role: Redundant overvoltage limiter in dual-redundant power architecture, certified to IEC 60601-1 creepage/clearance requirements. Use Value: Achieves <24µA leakage at 25.4V, minimizing standby power loss while meeting Class II medical insulation and leakage current limits. |
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-C33-7 | 0.3W SOT-23 package; 30–36V VZ range; 90Ω ZZT; RθJA = 350°C/W | Limited to low-power signal-level clamping; unsuitable for 1W+ rail protection | Select when board space is critical and power stress is <300mW |
| 1N5355B | 5W DO-41 through-hole; 32–34V VZ; 1Ω ZZT; requires manual soldering and larger footprint | Used in legacy designs or high-energy transient environments where 1W is insufficient | Select when system-level surge energy exceeds 1.5J and thermal mass must be maximized |
Compared with BZX84-C33-7 and 1N5355B, DFLZ33-7 uniquely balances 1W surface-mount capability, low 5Ω impedance, and AEC-Q qualification-making it optimal for modern automotive and industrial PCBs requiring reliable, solder-reflow-compatible voltage clamping.
Availability
DFLZ33-7 is available at Aetrix Electronics and suitable for industrial power supply protection, automotive ECU voltage reference, and telecom line card surge suppression requiring stable component supply and full traceability.
Supply support for DFLZ33-7 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.
The DFLZ series belongs to Diodes' Power Discrete product line, engineered specifically for high-reliability voltage regulation and transient suppression in automotive, industrial, and communications infrastructure applications.
FAQ
What is the maximum reverse voltage DFLZ33-7 can withstand before breakdown?
DFLZ33-7 has a nominal zener voltage of 33V with a guaranteed range of 31V to 35V at 25mA test current. Its reverse breakdown occurs within this range; operation above 35V under sustained DC conditions risks exceeding its 1.0W power limit and thermal failure. The device is not rated for repetitive avalanche beyond datasheet-specified pulse conditions.
Does DFLZ33-7 require a series current-limiting resistor in typical applications?
Yes - a series resistor is mandatory to limit forward current during zener conduction and prevent thermal runaway. For example, at 48V rail clamping, a minimum 620Ω resistor limits worst-case current to ~24mA, keeping power dissipation within the 1.0W rating even at elevated ambient temperatures.
Is DFLZ33-7 compatible with lead-free reflow soldering profiles?
Yes - DFLZ33-7 uses matte tin-annealed terminals and is qualified for standard Pb-free reflow profiles (JEDEC J-STD-020, peak 260°C). Its PowerDI123 package withstands three reflow cycles without degradation, and moisture sensitivity level is rated at Level 1 (unlimited floor life at ≤30°C/60% RH).
How does the +0.06%/°C temperature coefficient affect long-term voltage stability?
Over a -40°C to +125°C range, the coefficient causes approximately ±1.0% total zener voltage shift relative to 25°C value - i.e., 33V shifts by ±0.33V. This is acceptable for non-precision clamping but insufficient for metrology-grade references; designers should include margin in overvoltage thresholds accordingly.
DFLZ33-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- POWERDI®123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 33 V
- Tolerance:
- ±6%
- Power - Max:
- 1 W
- Impedance (Max) (Zzt):
- 15 Ohms
- Current - Reverse Leakage @ Vr:
- 1 µA @ 24 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.2 V @ 200 mA
- Operating Temperature:
- -55°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- PowerDI™ 123
DFLZ33-7 FAQ
1.How can I place an order for DFLZ33-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for DFLZ33-7 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 DFLZ33-7 reliable?
The price and inventory of DFLZ33-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DFLZ33-7 is usually 5 days.
3.What payment methods are accepted for DFLZ33-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DFLZ33-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DFLZ33-7?
DFLZ33-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DFLZ33-7 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 DFLZ33-7?
For technical support, including DFLZ33-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DFLZ33-7 requirements.
6.How does Aetrix verify that DFLZ33-7 is sourced from the original manufacturer or authorized distributors?
All DFLZ33-7 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 DFLZ33-7 meets industry standards.
7.What is the process for return or replacement of DFLZ33-7?
All DFLZ33-7 units undergo pre-shipment inspection (PSI). If there is an issue with DFLZ33-7, 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 DFLZ33-7 part is unused and in its original packaging.
Return procedure for DFLZ33-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
DFLZ33-7 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…
