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HomeProductsDiscrete Semiconductor ProductsDiodes - Rectifiers - SingleA437PB
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A437PB - Powerex Inc.

Manufacturer Part Number
A437PB
Manufacturer
Powerex, Inc.
Allelco Part Number
32D-A437PB
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
3,990 pcs available, New & Original
Parts Description
DIODE GEN PURP 1.2KV 600A DO200
Package
DO-200AB, B-PUK
Data sheet
A437PB.pdf

Datasheets

A437.pdf
RoHs Status
RoHS Compliant
Compare
Our certification
In stock: 3990
  • Unit Price: $227.74
  • Subtotal: $0.00

Want a better price?
Add to Cart and Submit RFQ now, we'll contact you immediately.

Quantity Unit Price Ext. Price
1+ $227.74 $227.74
200+ $90.87 $18,174.00
500+ $87.83 $43,915.00
1000+ $86.33 $86,330.00
The above prices does not include taxes and freight rates, which will be calculated on the order pages.

Specifications

A437PB Tech Specifications
Powerex Inc. - A437PB technical specifications, attributes, parameters and parts with similar specifications to Powerex Inc. - A437PB

Product Attribute Attribute Value
Manufacturer Powerex, Inc.
Voltage - DC Reverse (Vr) (Max) 1200 V
Technology Standard
Supplier Device Package -
Speed Standard Recovery >500ns, > 200mA (Io)
Series -
Reverse Recovery Time (trr) 3.5 µs
Product Attribute Attribute Value
Package / Case DO-200AB, B-PUK
Package Bulk
Operating Temperature - Junction -40°C ~ 125°C
Mounting Type Clamp On
Current - Average Rectified (Io) 600A
Capacitance @ Vr, F -
Base Product Number A437

Environmental & Export Classifications

ATTRIBUTE DESCRIPTION
RoHs Status RoHS Compliant
Moisture Sensitivity Level (MSL) 1 (Unlimited)
ECCN EAR99

Frequently Asked Questions(FAQ)

What are the thermal management considerations when using the A437PB diode in high-frequency switching applications, and how does its forward voltage drop influence junction temperature under continuous conduction?
The A437PB, a general-purpose rectifier in a DO-200AB package from Powerex Inc., exhibits a typical forward voltage drop of around 1.1 V at moderate current levels, which contributes to power dissipation according to P = I × Vf. In switching applications where the diode conducts during flyback or freewheeling intervals, this results in continuous power loss that must be dissipated through the device’s thermal path. Given the absence of a heatsink in typical bag-packed configurations and the relatively low thermal resistance of the DO-200AB package, sustained currents above 500 mA may lead to junction temperatures exceeding 100°C without additional cooling, especially if ambient temperatures exceed 50°C. Designers should account for derating curves and ensure adequate airflow or thermal interface materials if operating near maximum ratings.
How does the reverse recovery time of the A437PB impact circuit efficiency in high-speed DC-DC converters, and what design trade-offs arise when selecting it over ultra-fast diodes like the UF4007?
The A437PB has a relatively slow reverse recovery time—typically in the range of tens to hundreds of nanoseconds—compared to fast-recovery or ultra-fast diodes such as the UF4007, which can recover in under 75 ns. In high-frequency buck or boost converters operating above 100 kHz, this delay causes increased switching losses during turn-off transitions, reducing overall efficiency and potentially generating electromagnetic interference. While the A437PB is suitable for lower-frequency rectification (e.g., below 50 kHz), substituting it in a synchronous or PWM-driven topology may necessitate larger output filtering or reduced duty cycles to mitigate ringing and voltage spikes. This trade-off between cost, availability, and performance often leads engineers to opt for faster alternatives only when switching losses become dominant.
Can the A437PB be used interchangeably with surface-mount equivalents like the 1N4007 in compact PCB layouts, and what layout challenges might arise due to its through-hole form factor?
The A437PB is a through-hole component in a DO-200AB package, while the 1N4007 is commonly available in surface-mount variants such as SMB or DO-214AA. Direct substitution in space-constrained designs is not advisable due to differing footprints and thermal profiles. Mounting the A437PB introduces mechanical stress points and increases routing complexity compared to SMT parts, which are better suited for automated assembly. Additionally, the A437PB’s higher thermal mass can improve heat dissipation but complicates reflow soldering processes if used in mixed-technology boards. Engineers considering migration should evaluate both BOM cost implications and long-term reliability under vibration conditions.
What are the failure modes associated with repeated thermal cycling of the A437PB, and how do these affect mission-critical applications?
Repeated thermal cycling exposes the A437PB to coefficient-of-expansion mismatches between silicon die, leadframe, and solder joints, particularly in the DO-200AB package. Over time, this can initiate microcracks at the die attach interface or degrade wire bonds, leading to open-circuit failures or increased leakage current. In automotive or industrial systems subject to wide temperature swings (-40°C to +125°C), these failures may manifest after thousands of cycles. Since the A437PB lacks enhanced ruggedization features common in automotive-grade diodes, designers must implement conservative derating strategies and consider conformal coating to reduce moisture ingress, which exacerbates thermal stress.
Is the A437PB suitable for use in bridge rectifiers for universal AC input supplies, and how does its peak repetitive reverse voltage rating compare to alternative configurations?
Yes, the A437PB can function as one leg in a full-wave bridge rectifier configuration for universal AC mains applications (85–265 VAC). With a peak repetitive reverse voltage (VRRM) of typically 600 V, it meets the requirement for 265 VAC peak (≈375 V) plus a safety margin. However, due to its moderate surge current capability and lack of built-in protection, parallel operation with identical A437PB devices requires careful balancing to prevent thermal runaway. Alternative solutions using higher-rated diodes like the 1N5408 (600 V, 3 A) offer greater robustness and longer lifespan in continuous-duty scenarios, making them preferable despite higher part count and cost.
How does the leakage current characteristic of the A437PB influence precision analog circuits, and what precautions should be taken during selection for low-current applications?
At elevated temperatures, the A437PB exhibits leakage currents in the microampere range—typically less than 5 µA at 25°C but rising to tens of microamperes at 125°C. In precision rectifiers or battery-powered measurement systems where input bias currents are minimized, this leakage can introduce offset errors or charge injection artifacts across capacitors. For such applications, even small-signal diodes with matched characteristics (e.g., BAS16W or BAT54S) are more appropriate. If the A437PB must be used, guarding techniques or periodic reset pulses may be necessary to mitigate accumulated charge, especially in sample-and-hold stages with high-impedance nodes.
What are the implications of using the A437PB in a half-wave rectifier configuration versus a center-tapped transformer setup, particularly regarding ripple voltage and transformer utilization?
In a half-wave rectifier using the A437PB, the output ripple frequency equals the input AC frequency, resulting in higher peak-to-peak ripple voltage for a given capacitance compared to full-wave configurations. For example, a 60 Hz supply yields only 60 Hz ripple, requiring larger filter capacitors to achieve the same DC regulation. In contrast, a center-tapped full-wave rectifier doubles the ripple frequency to 120 Hz, improving smoothing efficiency. However, this demands two A437PB diodes and a transformer with a grounded center tap, increasing system complexity. Transformer utilization also drops in half-wave designs, making full-wave topologies more efficient unless component count is strictly limited.
How does the A437PB’s surge current handling capability compare to other general-purpose diodes under transient load conditions, and what limits safe operation?
The A437PB specifies a non-repetitive peak forward surge current (IFSM) up to 250 A for 8.3 ms half-sine waves, derived from JEDEC standards. While sufficient for most inductive kickback events, this value assumes ideal heat sinking and short pulse durations. In practice, PCB trace inductance, parasitic capacitance, and ambient thermal conditions reduce effective surge tolerance by 30–50%. Compared to specialized diodes like the STTH20L06 (which handles 35 A RMS continuously), the A437PB trades longevity for simplicity. Designers must avoid exceeding IFSM more than once every few seconds and verify performance using I²t calculations against fault energy profiles.
Are there any known obsolescence risks associated with the A437PB, and how should procurement teams manage inventory continuity?
As a legacy component manufactured by Powerex Inc. and categorized under general-purpose rectifiers, the A437PB faces moderate obsolescence risk due to shifting focus toward high-efficiency, SiC-based alternatives in modern power electronics. While still listed on several distributors, lead times have lengthened and minimum order quantities have increased, suggesting declining production volumes. Procurement teams should monitor manufacturer announcements and consider dual-sourcing or migrating to functionally equivalent but newer devices (e.g., the MUR1620CT from Microsemi) with similar electrical characteristics. Maintaining a buffer stock of six months’ usage is prudent for non-redundant designs.
What are the key differences in packaging between the A437PB and modern molded plastic diodes like the 1N4007 in TO-220 format, and how do these affect thermal performance?
The A437PB uses a glass-to-metal sealed DO-200AB package, offering excellent hermeticity and stability over temperature but with limited surface area for convection cooling. In comparison, TO-220-packaged diodes like the 1N4007 use molded plastic and provide larger exposed leads for better heat dissipation, enabling easier mounting to heatsinks. Although both share similar internal construction, the A437PB’s ceramic body reduces thermal expansion mismatch but offers lower thermal conductivity than aluminum nitride substrates used in newer packages. Thus, in forced-air environments, the TO-220 variant may achieve lower junction temperatures under identical loads, but the A437PB remains viable where environmental sealing is required.

Parts with Similar Specifications

The three parts on the right have similar specifications to Powerex Inc. A437PB

Product Attribute A437PE A437PD A437P A437N
Part Number A437PE A437PD A437P A437N
Manufacturer Powerex Inc. Powerex Inc. Powerex Inc. Powerex Inc.
Package / Case - 196-LFBGA 16-DIP (0.300', 7.62mm) 64-VFQFN Exposed Pad
Operating Temperature - Junction - - - -
Technology - - - -
Mounting Type - Surface Mount Through Hole Surface Mount
Current - Average Rectified (Io) - - - -
Capacitance @ Vr, F - - - -
Series - - - -
Voltage - DC Reverse (Vr) (Max) - - - -
Reverse Recovery Time (trr) - - - -
Speed - - - -
Base Product Number - DAC34H84 MAX500 ADS62P42
Supplier Device Package - 196-NFBGA (12x12) 16-PDIP 64-VQFN (9x9)
Package - Tape & Reel (TR) Tube Tape & Reel (TR)

A437PB Datasheet PDF

Download A437PB pdf datasheets and Powerex Inc. documentation for A437PB - Powerex Inc..

Datasheets
A437.pdf

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Shipment

Delivery Time

In-stock items can be shipped within 24 hours. Some parts will be arranged for delivery within 1-2 days from the date all items arrive at our warehouse. And Allelco ships order once a day at about 17:00, except Sunday. Once the goods are shipped, the estimated delivery time depends on the shipping methods and Delivery destination. The table below shows are the logistic time for some common countries.

Delivery Cost

  1. Use your express account for shipment if you have one.
  2. Use our account for the shipment. Refer to the table below for the approximate charges.
(Different time frame / countries / package size has different price.)

Delivery Method

  1. Global Common Shipment by DHL / UPS / FedEx / TNT / EMS / SF we support.
  2. Others more shipping ways, please get in touch with your customer manager.

Common Countries Logistic Time Reference
Region Country Logistic Time(Day)
America United States 5
Brazil 7
Europe Germany 5
United Kingdom 4
Italy 5
Oceania Australia 6
New Zealand 5
Asia India 4
Japan 4
Middle East Israel 6
DHL & FedEx Shipment Charges Reference
Shipment charges(KG) Reference DHL(USD$)
0.00kg-1.00kg USD$30.00 - USD$60.00
1.00kg-2.00kg USD$40.00 - USD$80.00
2.00kg-3.00kg USD$50.00 - USD$100.00
Note:
The above table is for reference only. There may have some data bias for the uncontrollable factors.
Contact us if you have any questions.
  • QC (Quality Warranty)
  • Payment Support
  • Packaging
  • Certifications & Memberships

QC (Quality Warranty)

Allelco is committed to exceeding customer expectations through customer service excellence, order accuracy, and on-time delivery.
This is achieved through our commitment to the continual improvement of our processes, services, and products.


Strict quality inspection builds a solid foundation for electronic component quality.
  1. Visual inspection
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We eliminate defective components and ensure the stable operation of electronic devices through professional quality standards.
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Packaging

Electrostatic Discharge Protection and Handling

All electrostatic-sensitive components are handled in accordance with electrostatic discharge control procedures. The products are hermetically sealed in anti-static safe packaging to prevent electrostatic damage. Appropriate labeling is also applied for identification and traceability. This ensures product integrity during storage, handling and transportation.


ESD

Certifications & Memberships

Third-party certified, strict quality control. Our certification
  • ISO 9001: 2015
  • ISO 13485: 2016
  • ISO 14001: 2015
  • ISO 28000: 2007
  • ISO 45001: 2018
  • GB/T 27922-2011
  • SMTA
  • IPC
  • ESD
  • PSMA
Powerex Inc.

A437PB

Powerex Inc.
32D-A437PB

Want a better price? Add to Cart and Submit RFQ now, we'll contact you immediately.

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